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Updated: 32 weeks 1 day ago

Lev Lafayette: Drupal "Access denied" Message

February 27, 2018 - 16:04

It happens rarely enough, but on occasion (such as an upgrade to a database system (e.g., MySQL, MariaDB) or system version of a web-scripting language (e.g., PHP), you can end up with one's Drupal site failing to load, displaying only the error message similar to:


PDOException: SQLSTATE[HY000] [1044] Access denied for user 'username'@'localhost' to database 'database' in lock_may_be_available() (line 167 of /website/includes/lock.inc).

The cryptic introduction to the error message actually describes what the problem is, as error messages usually do. However, also like a lot of error messages it really doesn't provide an immediately obvious solution. So the problem is that a lock has been initiated on username@localhost, and because of the database cannot be accessed, and therefore the site won't load.

This is different to similar error messages, such as:


PDOException: SQLSTATE[08004] [1040] Too many connections in lock_may_be_available() (line 167 of /website/includes/lock.inc).

Which again, means what it says, and will probably need more file system space, clearing cache etc.

The blunt trauma method to solve the problem at hand however is to remove the offending user and recreate it. However before one does the usual rules about site and database backups apply. Unless you're feeling confident, and we know what confidence means in monkeying around with production databases.

The username, database, and password will be stored in Drupal's site located in sites/default/settings.php. Recreate the user and ... now what was their privileges again? If these haven't been set the result will be similar to:

Warning: PDO::__construct(): The server requested authentication method unknown to the client [mysql_old_password] in DatabaseConnection->__construct() (line 304 of /website/includes/database/database.inc).

To fix this, grant the user the appropriate privileges. In MySQL/MariaDB etc this will be


GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, INDEX, ALTER, CREATE TEMPORARY TABLES ON database.* TO 'user'@'localhost' IDENTIFIED BY 'password';

And hopefully this short post will save someone else a bit of time.

Categories: Aligned Planets

OpenSTEM: At Mercy of the Weather

February 26, 2018 - 14:05
It is the time of year when Australia often experiences extreme weather events. February is renowned as the hottest month and, in some parts of the country, also the wettest month. It often brings cyclones to our coasts and storms, which conversely enough, may trigger fires as lightening strikes the hot, dry bush. Aboriginal people […]
Categories: Aligned Planets

Chris Samuel: Vale Dad

February 25, 2018 - 22:01

[I’ve been very quiet here for over a year for reasons that will become apparent in the next few days when I finish and publish a long post I’ve been working on for a while – difficult to write, hence the delay]

It’s 10 years ago today that my Dad died, and Alan and I lost the father who had meant so much to both of us. It’s odd realising that it’s over 1/5th of my life since he died, it doesn’t seem that long.

Vale dad, love you…

This item originally posted here:

Vale Dad

Categories: Aligned Planets

Linux Users of Victoria (LUV) Announce: LUV Main March 2018 Meeting: Unions - Hacking society's operating system

February 24, 2018 - 20:03
Start: Mar 6 2018 18:30 End: Mar 6 2018 20:30 Start: Mar 6 2018 18:30 End: Mar 6 2018 20:30 Location:  Mail Exchange Hotel, 688 Bourke St, Melbourne VIC 3000 Link:  http://mailexchangehotel.com.au/

Tuesday, March 6, 2018

6:30 PM to 8:30 PM
Mail Exchange Hotel
688 Bourke St, Melbourne VIC 3000

Speakers:

Mail Exchange Hotel, 688 Bourke St, Melbourne VIC 3000

Food and drinks will be available on premises.

Linux Users of Victoria is a subcommittee of Linux Australia.

March 6, 2018 - 18:30

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Categories: Aligned Planets

Tim Serong: Strange Bedfellows

February 24, 2018 - 02:05

The Tasmanian state election is coming up in a week’s time, and I’ve managed to do a reasonable job of ignoring the whole horrible thing, modulo the promoted tweets, the signs on the highway, the junk the major (and semi-major) political parties pay to dump in my letterbox, and occasional discussions with friends and neighbours.

Promoted tweets can be blocked. The signs on the highway can (possibly) be re-purposed for a subsequent election, or can be pulled down and used for minor windbreak/shelter works for animal enclosures. Discussions with friends and neighbours are always interesting, even if one doesn’t necessarily agree. I think the most irritating thing is the letterbox junk; at best it’ll eventually be recycled, at worst it becomes landfill or firestarters (and some of those things do make very satisfying firestarters).

Anyway, as I live somewhere in the wilds division of Franklin, I thought I’d better check to see who’s up for election here. There’s no independents running this time, so I’ve essentially got the choice of four parties; Shooters, Fishers and Farmers Tasmania, Tasmanian Greens, Tasmanian Labor and Tasmanian Liberals (the order here is the same as on the TEC web site; please don’t infer any preference based on the order in which I list parties in this blog post).

I feel like I should be setting party affiliations aside and voting for individuals, but of the sixteen candidates listed, to the best of my knowledge I’ve only actually met and spoken with two of them. Another I noticed at random in a cafe, and I was ignored by a fourth who was milling around with some cronies at a promotional stand out the front of Woolworths in Huonville a few weeks ago. So, party affiliations it is, which leads to an interesting thought experiment.

When you read those four party names above, what things came most immediately to mind? For me, it was something like this:

  • Shooters, Fishers & Farmers: Don’t take our guns. Fuck those bastard Greenies.
  • Tasmanian Greens: Protect the natural environment. Renewable energy. Try not to kill anything. Might collaborate with Labor. Liberals are big money and bad news.
  • Tasmanian Labor: Mellifluous babble concerning health, education, housing, jobs, pokies and something about workers rights. Might collaborate with the Greens. Vehemently opposed to the Liberals.
  • Tasmanian Liberals: Mellifluous babble concerning jobs, health, infrastructure, safety and the Tasmanian way of life, peppered with something about small business and family values. Vehemently opposed to Labor and the Greens.

And because everyone usually automatically thinks in terms of binaries (e.g. good vs. evil, wrong vs. right, one vs. zero), we tend to end up imagining something like this:

  • Shooters, Fishers & Farmers vs. Greens
  • Labor vs. Liberal
  • …um. Maybe Labor and the Greens might work together…
  • …but really, it’s going to be Labor or Liberal in power (possibly with some sort of crossbench or coalition support from minor parties, despite claims from both that it’ll be majority government all the way).

It turns out that thinking in binaries is remarkably unhelpful, unless you’re programming a computer (it’s zeroes and ones all the way down), or are lost in the wilderness (is this plant food or poison? is this animal predator or prey?) The rest of the time, things tend to be rather more colourful (or grey, depending on your perspective), which leads back to my thought experiment: what do these “naturally opposed” parties have in common?

According to their respective web sites, the Shooters, Fishers & Farmers and the Greens have many interests in common, including agriculture, biosecurity, environmental protection, tourism, sustainable land management, health, education, telecommunications and addressing homelessness. There are differences in the policy details of course (some really are diametrically opposed), but in broad strokes these two groups seem to care strongly about – and even agree on – many of the same things.

Similarly, Labor and Liberal are both keen to tell a story about putting the people of Tasmania first, about health, education, housing, jobs and infrastructure. Honestly, for me, they just kind of blend into one another; sure there’s differences in various policy details, but really if someone renamed them Labal and Liberor I wouldn’t notice. These two are the status quo, and despite fighting it out with each other repeatedly, are, essentially, resting on their laurels.

Here’s what I’d like to see: a minority Tasmanian state government formed from a coalition of the Tasmanian Greens plus the Shooters, Fishers & Farmers party, with the Labor and Liberal parties together in opposition. It’ll still be stuck in that irritating Westminster binary mode, but at least the damn thing will have been mixed up sufficiently that people might actually talk to each other rather than just fighting.

Categories: Aligned Planets

Russell Coker: Dell PowerEdge T30

February 23, 2018 - 02:02

I just did a Debian install on a Dell PowerEdge T30 for a client. The Dell web site is a bit broken at the moment, it didn’t list the price of that server or give useful specs when I was ordering it. I was under the impression that the server was limited to 8G of RAM, that’s unusually small but it wouldn’t be the first time a vendor crippled a low end model to drive sales of more expensive systems. It turned out that the T30 model I got has 4*DDR4 sockets with only one used for an 8G DIMM. It apparently can handle up to 64G of RAM.

It has space for 4*3.5? SATA disks but only has 4*SATA connectors on the motherboard. As I never use the DVD in a server this isn’t a problem for me, but if you want 4 disks and a DVD then you need to buy a PCI or PCIe SATA card.

Compared to the PowerEdge T130 I’m using at home the new T30 is slightly shorter and thinner while seeming to have more space inside. This is partly due to better design and partly due to having 2 hard drives in the top near the DVD drive which are a little inconvenient to get to. The T130 I have (which isn’t the latest model) has 4*3.5? SATA drive bays at the bottom which are very convenient for swapping disks.

It has two PCIe*16 slots (one of which is apparently quad speed), one shorter PCIe slot, and a PCI slot. For a cheap server a PCI slot is a nice feature, it means I can use an old PCI Ethernet card instead of buying a PCIe Ethernet card. The T30 cost $1002 so using an old Ethernet card saved 1% of the overall cost.

The T30 seems designed to be more of a workstation or personal server than a straight server. The previous iterations of the low end tower servers from Dell didn’t have built in sound and had PCIe slots that were adequate for a RAID controller but vastly inadequate for video. This one has built in line in and out for audio and has two DisplayPort connectors on the motherboard (presumably for dual-head support). Apart from the CPU (an E3-1225 which is slower than some systems people are throwing out nowadays) the system would be a decent gaming system.

It has lots of USB ports which is handy for a file server, I can attach lots of backup devices. Also most of the ports support “super speed”, I haven’t yet tested out USB devices that support such speeds but I’m looking forward to it. It’s a pity that there are no USB-C ports.

One deficiency of the T30 is the lack of a VGA port. It has one HDMI and two DisplayPort sockets on the motherboard, this is really great for a system on or under your desk, any monitor you would want on your desk will support at least one of those interfaces. But in a server room you tend to have an old VGA monitor that’s there because no-one wants it on their desk. Not supporting VGA may force people to buy a $200 monitor for their server room. That increases the effective cost of the system by 20%. It has a PC serial port on the motherboard which is a nice server feature, but that doesn’t make up for the lack of VGA.

The BIOS configuration has an option displayed for enabling charging devices from USB sockets when a laptop is in sleep mode. It’s disappointing that they didn’t either make a BIOS build for a non-laptop or have the BIOS detect at run-time that it’s not on laptop hardware and hide that.

Conclusion

The PowerEdge T30 is a nice low-end workstation. If you want a system with ECC RAM because you need it to be reliable and you don’t need the greatest performance then it will do very well. It has Intel video on the motherboard with HDMI and DisplayPort connectors, this won’t be the fastest video but should do for most workstation tasks. It has a PCIe*16 quad speed slot in case you want to install a really fast video card. The CPU is slow by today’s standards, but Dell sells plenty of tower systems that support faster CPUs.

It’s nice that it has a serial port on the motherboard. That could be used for a serial console or could be used to talk to a UPS or other server-room equipment. But that doesn’t make up for the lack of VGA support IMHO.

One could say that a tower system is designed to be a desktop or desk-side system not run in any sort of server room. However it is cheaper than any rack mounted systems from Dell so it will be deployed in lots of small businesses that have one server for everything – I will probably install them in several other small businesses this year. Also tower servers do end up being deployed in server rooms, all it takes is a small business moving to a serviced office that has a proper server room and the old tower servers end up in a rack.

Rack vs Tower

One reason for small businesses to use tower servers when rack servers are more appropriate is the issue of noise. If your “server room” is the room that has your printer and fax then it typically won’t have a door and you just can’t have the noise of a rack mounted server in there. 1RU systems are inherently noisy because the small diameter of the fans means that they have to spin fast. 2RU systems can be made relatively quiet if you don’t have high-end CPUs but no-one seems to be trying to do that.

I think it would be nice if a company like Dell sold low-end servers in a rack mount form-factor (19 inches wide and 2RU high) that were designed to be relatively quiet. Then instead of starting with a tower server and ending up with tower systems in racks a small business could start with a 19 inch wide system on a shelf that gets bolted into a rack if they move into a better office. Any laptop CPU from the last 10 years is capable of running a file server with 8 disks in a ZFS array. Any modern laptop CPU is capable of running a file server with 8 SSDs in a ZFS array. This wouldn’t be difficult to design.

Related posts:

  1. CPL I’ve just bught an NVidia video card from Computers and...
  2. Flash Storage and Servers In the comments on my post about the Dell PowerEdge...
  3. Dell PowerEdge T105 Today I received a Dell PowerEDGE T105 for use by...
Categories: Aligned Planets

Colin Charles: MariaDB Developer’s unconference & M|18

February 21, 2018 - 14:02

Been a while since I wrote anything MySQL/MariaDB related here, but there’s the column on the Percona blog, that has weekly updates.

Anyway, I’ll be at the developer’s unconference this weekend in NYC. Even managed to snag a session on the schedule, MySQL features missing in MariaDB Server (Sunday, 12.15–13.00). Signup on meetup?

Due to the prevalence of “VIP tickets”, I too signed up for M|18. If you need a discount code, I’ll happily offer them up to you to see if they still work (though I’m sure a quick Google will solve this problem for you). I’ll publish notes, probably in my weekly column.

If you’re in New York and want to say hi, talk shop, etc. don’t hesitate to drop me a line.

Categories: Aligned Planets

Pia Waugh: An optimistic future

February 18, 2018 - 06:01

This is my personal vision for an event called “Optimistic Futures” to explore what we could be aiming for and figure out the possible roles for government in future.

Technology is both an enabler and a disruptor in our lives. It has ushered in an age of surplus, with decentralised systems enabled by highly empowered global citizens, all creating increasing complexity. It is imperative that we transition into a more open, collaborative, resilient and digitally enabled society that can respond exponentially to exponential change whilst empowering all our people to thrive. We have the means now by which to overcome our greatest challenges including poverty, hunger, inequity and shifting job markets but we must be bold in collectively designing a better future, otherwise we may unintentionally reinvent past paradigms and inequities with shiny new things.

Technology is only as useful as it affects actual people, so my vision starts, perhaps surprisingly for some, with people. After all, if people suffer, the system suffers, so the well being of people is the first and foremost priority for any sustainable vision. But we also need to look at what all sectors and communities across society need and what part they can play:

  • People: I dream of a future where the uniqueness of local communities, cultures and individuals is amplified, where diversity is embraced as a strength, and where all people are empowered with the skills, capacity and confidence to thrive locally and internationally. A future where everyone shares in the benefits and opportunities of a modern, digital and surplus society/economy with resilience, and where everyone can meaningfully contribute to the future of work, local communities and the national/global good.
  • Public sectors: I dream of strong, independent, bold and highly accountable public sectors that lead, inform, collaborate, engage meaningfully and are effective enablers for society and the economy. A future where we invest as much time and effort on transformational digital public infrastructure and skills as we do on other public infrastructure like roads, health and traditional education, so that we can all build on top of government as a platform. Where everyone can have confidence in government as a stabilising force of integrity that provides a minimum quality of life upon which everyone can thrive.
  • The media: I dream of a highly effective fourth estate which is motivated systemically with resilient business models that incentivise behaviours to both serve the public and hold power to account, especially as “news” is also arguably becoming exponential. Actionable accountability that doesn’t rely on the linearity and personal incentives of individuals to respond will be critical with the changing pace of news and with more decisions being made by machines.
  • Private, academic and non-profit sectors: I dream of a future where all sectors can more freely innovate, share, adapt and succeed whilst contributing meaningfully to the public good and being accountable to the communities affected by decisions and actions. I also see a role for academic institutions in particular, given their systemic motivation for high veracity outcomes without being attached to one side, as playing a role in how national/government actions are measured, planned, tested and monitored over time.
  • Finally, I dream of a world where countries are not celebrated for being just “digital nations” but rather are engaged in a race to the top in using technology to improve the lives of all people and to establish truly collaborative democracies where people can meaningfully participate in the shaping the optimistic and inclusive futures.

Technology is a means, not an ends, so we need to use technology to both proactively invent the future we need (thank you Alan Kay) and to be resilient to change including emerging tech and trends.

Let me share a few specific optimistic predictions for 2070:

  • Automation will help us redesign our work expectations. We will have a 10-20 hour work week supported by machines, freeing up time for family, education, civic duties and innovation. People will have less pressure to simply survive and will have more capacity to thrive (this is a common theme, but something I see as critical).
  • 3D printing of synthetic foods and nanotechnology to deconstruct and reconstruct molecular materials will address hunger, access to medicine, clothes and goods, and community hubs (like libraries) will become even more important as distribution, education and social hubs, with drones and other aerial travel employed for those who can’t travel. Exoskeletons will replace scooters
  • With rocket travel normalised, and only an hour to get anywhere on the planet, nations will see competitive citizenships where countries focus on the best quality of life to attract and retain people, rather than largely just trying to attract and retain companies as we do today. We will also likely see the emergence of more powerful transnational communities that have nationhood status to represent the aspects of people’s lives that are not geopolitically bound.
  • The public service has highly professional, empathetic and accountable multi-disciplinary experts on responsive collaborative policy, digital legislation, societal modeling, identifying necessary public digital infrastructure for investment, and well controlled but openly available data, rules and transactional functions of government to enable dynamic and third party services across myriad channels, provided to people based on their needs but under their control. We will also have a large number of citizens working 1 or 2 days a week in paid civic duties on areas where they have passion, skills or experience to contribute.
  • The paralympics will become the main game, as it were, with no limits on human augmentation. We will do the 100m sprint with rockets, judo with cyborgs, rock climbing with tentacles. We have access to medical capabilities to address any form of disease or discomfort but we don’t use the technologies to just comply to a normative view of a human. People are free to choose their form and we culturally value diversity and experimentation as critical attributes of a modern adaptable community.

I’ve only been living in New Zealand a short time but I’ve been delighted and inspired by what I’ve learned from kiwi and M?ori cultures, so I’d like to share a locally inspired analogy.

Technology is on one hand, just a waka (canoe), a vehicle for change. We all have a part to play in the journey and in deciding where we want to go. On the other hand, technology is also the winds, the storms, the thunder, and we have to continually work to understand and respond to emerging technologies and trends so we stay safely on course. It will take collaboration and working towards common goals if we are to chart a better future for all.

Categories: Aligned Planets

Donna Benjamin: Site building with Drupal

February 17, 2018 - 14:02
Saturday, February 17, 2018 - 14:05What even is "Site Building"?

At DrupalDownunder some years back, the wonderful Erica Bramham named her talk "All node, no code". Nodes were the fundamental building blocks in Drupal, they were like single drops of content. These days though, it's all about entities.

But hang on a minute, I'm using lots of buzz words, and worse, I'm using words that mean different things in different contexts. Jargon is one of the first hurdles you need to jump to understand the diverse worlds of the web. People who grow up multi-lingual learn that the meanings of words is somewhat arbitrary. They learn the same thing has different names. This is true for the web too. So the first thing to know about Site Building, is it means different things to different people. 

To me, it means being able to build a website with out knowing how to code. I also believe it means I can build a website without having to set up my own development environment. I know people who vehemently disagree with me about this. But that's ok. This is my blog, and these are my rules.

So - this is a post about site building, using SimplyTest.Me and Drupal 8 out of the box.

1. Go to https://simplytest.me

2. Type Drupal Core in the search field, and select "Drupal core" from the list

3. Choose the latest development branch, right at the bottom of the list.

 

For me, right now, that's 8.6.x, and here's a screenshot of what that looks like.

 

4. Click "Launch sandbox".

Now wait.

In a few moments, you should see a fresh shiny Drupal 8 site, ready for you to explore.

For me today, it looks like this.  

 

In the top right of the window, you should see a "Log in" link.

Click that, and enter admin/admin to login. 

You're now ready to practice some site building!

First, you'll need to create some content to play with.  Here's a short screencast that shows you how to login, add an article, and change the title using Quick Edit.

A guide to what's next

Follow the Drupal User guide to start building your site!

If you want to start at the beginning, you'll get a great overview of Drupal, and some important info on how to plan your site. But if you want to roll up your sleeves and get building, you can skip the chapter on site installation and jump straight to chapter 4, and dive into basic site configuration.

 

Experiment

You have 24 hours to experiment with the simplytest.me sandbox - after that it disappears.

 

Get in touch

If you want something more permanent, you might want to "try drupal" or contact us at catalyst-au.net to discuss our Drupal services.

Categories: Aligned Planets

Linux Users of Victoria (LUV) Announce: LUV February 2018 Workshop: Installing an Open Source OS on your tablet or phone

February 17, 2018 - 12:03
Start: Feb 24 2018 12:30 End: Feb 24 2018 16:30 Start: Feb 24 2018 12:30 End: Feb 24 2018 16:30 Location:  Infoxchange, 33 Elizabeth St. Richmond Link:  http://luv.asn.au/meetings/map

Installing an Open Source OS on your tablet or phone

Andrew Pam will demonstrate how to install LineageOS, previously known as CyanogenMod and based on the Android Open Source Project, on tablets and phones.  Feel free to bring your own tablets and phones and have a go, but please ensure you back them up if there is anything you still need stored on them!

The meeting will be held at Infoxchange, 33 Elizabeth St. Richmond 3121.  Late arrivals please call (0421) 775 358 for access to the venue.

LUV would like to acknowledge Infoxchange for the venue.

Linux Users of Victoria is a subcommittee of Linux Australia.

February 24, 2018 - 12:30

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Categories: Aligned Planets

OpenSTEM: Australia at the Olympics

February 17, 2018 - 00:05
The modern Olympic games were started by Frenchman Henri de Baillot-Latour to promote international understanding. The first games of the modern era were held in 1896 in Athens, Greece. Australia has competed in all the Olympic games of the modern era, although our participation in the first one was almost by chance. Of course, the […]
Categories: Aligned Planets

OpenSTEM: Australia Day in the early 20th century

February 9, 2018 - 16:05
Australia Day and its commemoration on 26 January, has long been a controversial topic. This year has seen calls once again for the date to be changed. Similar calls have been made for a long time. As early as 1938, Aboriginal civil rights leaders declared a “Day of Mourning” to highlight issues in the Aboriginal […]
Categories: Aligned Planets

Russell Coker: Thinkpad X1 Carbon

February 8, 2018 - 16:03

I just bought a Thinkpad X1 Carbon to replace my Thinkpad X301 [1]. It cost me $289 with free shipping from an eBay merchant which is a great deal, a new battery for the Thinkpad X301 would have cost about $100.

It seems that laptops aren’t depreciating in value as much as they used to. Grays Online used to reliably have refurbished Thinkpads with manufacturer’s warranty selling for about $300. Now they only have IdeaPads (a cheaper low-end line from Lenovo) at good prices, admittedly $100 to $200 for an IdeaPad is a very nice deal if you want a cheap laptop and don’t need something too powerful. But if you want something for doing software development on the go then you are looking at well in excess of $400. So I ended up buying a second-hand system from an eBay merchant.

CPU

I was quite excited to read the specs that it has an i7 CPU, but now I have it I discovered that the i7-3667U CPU scores 3990 according to passmark (cpubenchmark.net) [2]. While that is much better than the U9400 in the Thinkpad X301 that scored 968, it’s only slightly better than the i5-2520M in my Thinkpad T420 that scored 3582 [3]. I bought the Thinkpad T420 in August 2013 [4], I had hoped that Moore’s Law would result in me getting a system at least twice as fast as my last one. But buying second-hand meant I got a slower CPU. Also the small form factor of the X series limits the heat dissipation and therefore limits the CPU performance.

Keyboard

Thinkpads have traditionally had the best keyboards, but they are losing that advantage. This system has a keyboard that feels like an Apple laptop keyboard not like a traditional Thinkpad. It still has the Trackpoint which is a major feature if you like it (I do). The biggest downside is that they rearranged the keys. The PgUp/PgDn keys are now by the arrow keys, this could end up being useful if you like the SHIFT-PgUp/SHIFT-PgDn combinations used in the Linux VC and some Xterms like Konsole. But I like to keep my keys by the home keys and I can’t do that unless I use the little finger of my right hand for PgUp/PgDn. They also moved the Home, End, and Delete keys which is really annoying. It’s not just that the positions are different to previous Thinkpads (including X series like the X301), they are different to desktop keyboards. So every time I move between my Thinkpad and a desktop system I need to change key usage.

Did Lenovo not consider that touch typists might use their products?

The keyboard moved the PrtSc key, and lacks ScrLk and Pause keys, but I hardly ever use the PrtSc key, and never use the other 2. The lack of those keys would only be of interest to people who have mapped them to useful functions and people who actually use PrtSc. It’s impractical to have a key as annoying to accidentally press as PrtSc between the Ctrl and Alt keys.

One significant benefit of the keyboard in this Thinkpad is that it has a backlight instead of having a light on the top of the screen that shines on the keyboard. It might work better than the light above the keyboard and looks much cooler! As an aside I discovered that my Thinkpad X301 has a light above the keyboard, but the key combination to activate it sometimes needs to be pressed several times.

Display

X1 Carbon 1600*900
T420 1600*900
T61 1680*1050
X301 1440*900

Above are the screen resolutions for all my Thinkpads of the last 8 years. The X301 is an anomaly as I got it from a rubbish pile and it was significantly older than Thinkpads usually are when I get them. It’s a bit disappointing that laptop screen resolution isn’t increasing much over the years. I know some people have laptops with resolutions as high as 2560*1600 (as high as a high end phone) it seems that most laptops are below phone resolution.

Kogan is currently selling the Agora 8+ phone new for $239, including postage that would still be cheaper than the $289 I paid for this Thinkpad. There’s no reason why new phones should have lower prices and higher screen resolutions than second-hand laptops. The Thinkpad is designed to be a high-end brand, other brands like IdeaPad are for low end devices. Really 1600*900 is a low-end resolution by today’s standards, 1920*1080 should be the minimum for high-end systems. Now I could have bought one of the X series models with a higher screen resolution, but most of them have the lower resolution and hunting for a second hand system with the rare high resolution screen would mean missing the best prices.

I wonder if there’s an Android app to make a phone run as a second monitor for a Linux laptop, that way you could use a high resolution phone screen to display data from a laptop.

This display is unreasonably bright by default. So bright it hurt my eyes. The xbacklight program doesn’t support my display but the command “xrandr –output LVDS-1 –brightness 0.4” sets the brightness to 40%. The Fn key combination to set brightness doesn’t work. Below a brightness of about 70% the screen looks grainy.

General

This Thinkpad has a 180G SSD that supports contiguous reads at 500MB/s. It has 8G of RAM which is the minimum for a usable desktop system nowadays and while not really fast the CPU is fast enough. Generally this is a nice system.

It doesn’t have an Ethernet port which is really annoying. Now I have to pack a USB Ethernet device whenever I go anywhere. It also has mini-DisplayPort as the only video connector, as that is almost never available at a conference venue (VGA and HDMI are the common ones) I’ll have to pack an adaptor when I give a lecture. It also only has 2 USB ports, the X301 has 3. I know that not having HDMI, VGA, and Ethernet ports allows designing a thinner laptop. But I would be happier with a slightly thicker laptop that has more connectivity options. The Thinkpad X301 has about the same mass and is only slightly thicker and has all those ports. I blame Apple for starting this trend of laptops lacking IO options.

This might be the last laptop I own that doesn’t have USB-C. Currently not having USB-C is not a big deal, but devices other than phones supporting it will probably be released soon and fast phone charging from a laptop would be a good feature to have.

This laptop has no removable battery. I don’t know if it will be practical to replace the battery if the old one wears out. But given that replacing the battery may be more than the laptop is worth this isn’t a serious issue. One significant issue is that there’s no option to buy a second battery if I need to have it run without mains power for a significant amount of time. When I was travelling between Australia and Europe often I used to pack a second battery so I could spend twice as much time coding on the plane. I know it’s an engineering trade-off, but they did it with the X301 and could have done it again with this model.

Conclusion

This isn’t a great laptop. The X1 Carbon is described as a flagship for the Thinkpad brand and the display is letting down the image of the brand. The CPU is a little disappointing, but it’s a trade-off that I can deal with.

The keyboard is really annoying and will continue to annoy me for as long as I own it. The X301 managed to fit a better keyboard layout into the same space, there’s no reason that they couldn’t have done the same with the X1 Carbon.

But it’s great value for money and works well.

Related posts:

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  2. I Just Bought a new Thinkpad and the Lenovo Web Site Sucks I’ve just bought a Thinkpad T61 at auction for $AU796....
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Categories: Aligned Planets

Jonathan Adamczewski: Watch as the OS rewrites my buggy program.

February 3, 2018 - 12:04

I didn’t know that SetErrorMode(SEM_NOALIGNMENTFAULTEXCEPT) was a thing, until I wrote a bad test that wouldn’t crash.

Digging into it, I found that a movaps instruction was being rewritten as movups, which was a thoroughly confusing thing to see.

The one clue I had was that a fault due to an unaligned load had been observed in non-test code, but did not reproduce when written as a test using the google-test framework. A short hunt later (including a failed attempt at writing a small repro case), I found an explanation: google test suppresses this class of failure.

The code below will successfully demonstrate the behavior, printing out the SIMD load instruction before and after calling the function with an unaligned pointer.

[Gist]

View the code on Gist.

Categories: Aligned Planets

OpenSTEM: Welcome Back!

February 2, 2018 - 16:05
Well, most of our schools are back, or about to start the new year. Did you know that there are schools using OpenSTEM materials in every state and territory of Australia? Our wide range of resources, especially those on Australian history, give detailed information about the history of all our states and territories. We pride […]
Categories: Aligned Planets

Craige McWhirter: Querying Installed Package Versions Across An Openstack Cloud

February 1, 2018 - 20:19

AKA: The Joy of juju run

Package upgrades across an OpenStack cloud do not always happen at the same time. In most cases they may happen within an hour or so across your cloud but for a variety reasons, some upgrades may be applied inconsistently, delayed or blocked on some servers.

As these packages may be rolling out a much needed patch or perhaps carrying a bug, you may wish to know which services are impacted in fairly short order.

If your OpenStack cloud is running Ubuntu and managed by Juju and MAAS, here's where juju run can come to the rescue.

For example, perhaps there's an update to the Corosync library libcpg4 and you wish to know which of your HA clusters have what version installed.

From your Juju controller, create a list of servers managed by Juju:

Juju 1.x:

$ juju stat --format tabular > jsft.out

Now you could fashion a query like this, utilising juju run:

$ for i in $(egrep -o '[a-z]+-hacluster/[0-9]+' jsft.out | cut -d/ -f1 | sort -u); do juju run --timeout 30s --service $i "dpkg-query -W -f='\${Version}' libcpg4" | \ python -c 'import yaml,sys;print("\n".join(["{} == {}".format(y["Stdout"], y["UnitId"]) for y in yaml.safe_load(sys.stdin)]))'; done

The output returned will look something like this:

2.3.3-1ubuntu4 == ceilometer-hacluster/1 2.3.3-1ubuntu4 == ceilometer-hacluster/0 2.3.3-1ubuntu4 == ceilometer-hacluster/2 2.3.3-1ubuntu4 == cinder-hacluster/0 2.3.3-1ubuntu4 == cinder-hacluster/1 2.3.3-1ubuntu4 == cinder-hacluster/2 2.3.3-1ubuntu4 == glance-hacluster/3 2.3.3-1ubuntu4 == glance-hacluster/4 2.3.3-1ubuntu4 == glance-hacluster/5 2.3.3-1ubuntu4 == keystone-hacluster/1 2.3.3-1ubuntu4 == keystone-hacluster/0 2.3.3-1ubuntu4 == keystone-hacluster/2 2.3.3-1ubuntu4 == mysql-hacluster/1 2.3.3-1ubuntu4 == mysql-hacluster/2 2.3.3-1ubuntu4 == mysql-hacluster/0 2.3.3-1ubuntu4 == ncc-hacluster/1 2.3.3-1ubuntu4 == ncc-hacluster/0 2.3.3-1ubuntu4 == ncc-hacluster/2 2.3.3-1ubuntu4 == neutron-hacluster/2 2.3.3-1ubuntu4 == neutron-hacluster/1 2.3.3-1ubuntu4 == neutron-hacluster/0 2.3.3-1ubuntu4 == osd-hacluster/0 2.3.3-1ubuntu4 == osd-hacluster/1 2.3.3-1ubuntu4 == osd-hacluster/2 2.3.3-1ubuntu4 == swift-hacluster/1 2.3.3-1ubuntu4 == swift-hacluster/0 2.3.3-1ubuntu4 == swift-hacluster/2

Juju 2.x:

$ juju status > jsft.out

Now you could fashion a query like this:

$ for i in $(egrep -o 'hacluster-[a-z]+/[0-9]+' jsft.out | cut -d/ -f1 |sort -u); do juju run --timeout 30s --application $i "dpkg-query -W -f='\${Version}' libcpg4" | \ python -c 'import yaml,sys;print("\n".join(["{} == {}".format(y["Stdout"], y["UnitId"]) for y in yaml.safe_load(sys.stdin)]))'; done

The output returned will look something like this:

2.3.5-3ubuntu2 == hacluster-ceilometer/1 2.3.5-3ubuntu2 == hacluster-ceilometer/0 2.3.5-3ubuntu2 == hacluster-ceilometer/2 2.3.5-3ubuntu2 == hacluster-cinder/1 2.3.5-3ubuntu2 == hacluster-cinder/0 2.3.5-3ubuntu2 == hacluster-cinder/2 2.3.5-3ubuntu2 == hacluster-glance/0 2.3.5-3ubuntu2 == hacluster-glance/1 2.3.5-3ubuntu2 == hacluster-glance/2 2.3.5-3ubuntu2 == hacluster-heat/0 2.3.5-3ubuntu2 == hacluster-heat/1 2.3.5-3ubuntu2 == hacluster-heat/2 2.3.5-3ubuntu2 == hacluster-horizon/0 2.3.5-3ubuntu2 == hacluster-horizon/1 2.3.5-3ubuntu2 == hacluster-horizon/2 2.3.5-3ubuntu2 == hacluster-keystone/0 2.3.5-3ubuntu2 == hacluster-keystone/1 2.3.5-3ubuntu2 == hacluster-keystone/2 2.3.5-3ubuntu2 == hacluster-mysql/0 2.3.5-3ubuntu2 == hacluster-mysql/1 2.3.5-3ubuntu2 == hacluster-mysql/2 2.3.5-3ubuntu2 == hacluster-neutron/0 2.3.5-3ubuntu2 == hacluster-neutron/2 2.3.5-3ubuntu2 == hacluster-neutron/1 2.3.5-3ubuntu2 == hacluster-nova/1 2.3.5-3ubuntu2 == hacluster-nova/2 2.3.5-3ubuntu2 == hacluster-nova/0

You can of course substitute libcpg4 in the above query for any package that you need to check.

By far and away my most favourite feature of Juju at present, juju run reminds me of knife ssh, which is unsurprisingly one of my favourite features of Chef.

Categories: Aligned Planets

Donna Benjamin: Inkscape at linux.conf.au Sydney 2018

January 31, 2018 - 20:03
Wednesday, January 31, 2018 - 20:12
Categories: Aligned Planets

Donna Benjamin: Turning stories into software at LCA2018

January 27, 2018 - 10:03
Saturday, January 27, 2018 - 09:57I love free software, but sometimes, I feel, that free software does not love me.   Why is it so hard to use? Why is it still so buggy? Why do the things I can do simply with other tools, take so much effort? Why is the documentation so inscrutable?  Why have all the config settings been removed from the GUI? Why does this HowTo assume I can find a config file, and edit it with VI? Do I have to learn to use VI before I can stop my window manager getting in the way of the application I’m trying to use?   Tis a mystery. Or is it?   It’s fair to say, that the Free Software community is still largely made up of blokes, who are software developers.  The idea that “user centered design” is a “Good Thing” is not evenly distributed. In fact, some seem to think it’s not a good thing at all, “patches welcome” they say, “go fix it yourself”.    The web community on the other hand, has discovered that the key to their success is understanding and meeting the needs of the people who use their software. Ideological purity is great, but enabling people to meet their objectives, is better.   As technologists, we get excited by technology. Of course we do! Technology is modern magic. And we are wizards. It’s wonderful. But the people who use our software are not necessarily interested in the tech itself, they probably just want to use it to get something done. They probably don’t even care what language it’s written in.   Let’s say a customer walks into a hardware store and says they want a drill.  Or perhaps they walk in and stand in front of a shelf simply contemplating a dizzying array of drills, drill bits and other accessories. Which one is right for the job they wonder. Should I get a cordless one? Will I really need diamond tipped drill bits?    There's a technique called the 5 Why's that's useful to get under the surface of a requirement. The idea is, you keep asking why until you uncover the real reason for a request, need, feature or widget. For example, we could ask this customer...   Why do you want this drill? To drill a hole.  Why? To hang a picture on my wall.   Why? To be able to share and enjoy this amazing photo from my recent holiday.   So we discover our customer did not, in fact, want a drill. Our customer wanted to express something about their identity by decorating their home.  So telling them all about the voltage of the drill, and the huge range of drill bits available, may have helped them choose the right drill for the job, but if we stop to understand the job in the first place, we’re more likely to be able to help that person get what they need to get their job done.   User stories are one way we can explore the “Why” behind the software we build. Check out my talk from the Developers Developers miniconf at linux.conf.au on Monday “Turning stories, into software.”  

 

References

 

Photo by Josh Simmons

AttachmentSize Turning stories into software - devdev lca2018.pdf2.13 MB
Categories: Aligned Planets

Simon Lyall: Linux.conf.au 2018 – Day 5 – Light Talks and Close

January 26, 2018 - 18:03

Lightning Talk

  • Usability Fails
  • Etching
  • Diverse Events
  • Kids Space – fairly unstructured and self organising
  • Opening up LandSat imagery – NBAR-T available on NCI
  • Project Nacho – HTML -> VPN/RDP gateway . Apache Guacomle
  • Vocaloids
  • Blockchain
  • Using j2 to create C++ code
  • Memory model code update
  • CLIs are user interface too
  • Complicated git things
  • Mollygive -matching donations
  • Abusing Docker

Closing

  • LCA 2019 will be in Christchurch, New Zealand – http://lca2019.linux.org.au
  • 700 Attendees at 2018
  • 400 talk and 36 Miniconf submissions

 

 

Categories: Aligned Planets

Simon Lyall: Linux.conf.au 2018 – Day 5 – Session 2

January 26, 2018 - 16:04

QUIC: Replacing TCP for the Web Jana Iyengar

  • History
    • Protocol for http transport
    • Deployed Inside Google 2014 and Chrome / mobile apps
    • Improved performance: Youtube rebuffers 15-18% , Google search latency 3.6 – 8 %
    • 35% of Google’s egree traffic (7% of Internet)
    • Working group started in 2016 to standardized QUIC
    • Turned off at the start of 2016 due to security problem
    • Doubled in Sept 2016 due turned on for the youtube app
  • Technology
    • Previously – ip _> TCP -> TLS -> HTTP/2
    • QUIC -> udp -> QUIC -> http over QUIC
    • Includes crypto and tcp handshake
    • congestion control
    • loss recovery
    • TLS 1.3 has some of the same features that QUIC pioneered, being updated to take account
  • HTTP/1
    • 1 trip for TCP
    • 2 trips for TLS
    • Single connection – Head Of Line blocking
    • Multiple TCP connections workaround.
  • HTTP/2
    • Streams within a single transport connection
    • Packet loss will stall the TCP layer
    • Unresolved problems
      • Connection setup latency
      • Middlebox interference with TCP – makes it hard to change TCP
      • Head of line blocking within TCP
  • QUIC
    • Connection setup
      • 0 round trips, handshake packet followed directly by data packet
      • 1 round-trips if crypto keys are not new
      • 2 round trips if QUIC version needs renegotiation
    • Streams
      • http/2 streams are sent as quic streams
  • Aspirations of protocol
    • Deployable and evolveable
    • Low latency connection establishment
    • Stream multiplexing
    • Better loss recovery and flexible congestion control
      • richer signalling (unique packet number)
      • better RTT estimates
    • Resilience to NAT-rebinding ( UDP Nat-mapping changes often, maybe every few seconds)
  • UDP is not a transport, you put something in top of UDP to build a transport
  • Why not a new protocol instead of UDP? Almost impossible to get a new protocol in middle boxes around the Internet.
  • Metrics
    • Search Latency (see paper for other metrics)
    • Enter search term > entire page is loaded
    • Mean: desktop improve 8% , mobile 3.6 %
    • Low latency: Desktop 1% , Mobile none
    • Highest Latency 90-99% of users: Desktop & mobile 15-16%
    • Video similar
    • Big gain is from 0 RTT handshake
  • QUIC – Search Latency Improvements by Country
    • South Korea – 38ms RTT – 1% improvement
    • USA – 50ms – 2 – 3.5 %
    • India – 188ms – 5 – 13%
  • Middlebox ossification
    • Vendor ossified first byte of QUIC packet – flags byte
    • since it seemed to be the same on all QUIC packets
    • broke QUIC deployment when a flag was fixed
    • Encryption is the only way to protect against network ossification
    • “Greasing” by randomly changing options is also an option.
  • Other Protocols over QUIC?
    • Concentrating on http/2
    • Looking at Web RPC

Remote Work: My first decade working from the far end of the earth John Dalton

  • “Remote work has given me a fulfilling technical career while still being able to raise my family in Tasmania”
  • First son both in 2015, wanted to start in Tasmania with family to raise them, rather than moving to a tech hub.
  • 2017 working with High Performance Computing at University Tasmania
  • If everything is going to be outsourced, I want to be the one they outsourced to.
  • Wanted to do big web stuff, nobody in Tasmania doing that.
  • Was a user at LibraryThing
    • They were searching for Sysadmin/DBA in Portland, Maine
    • Knew he could do the job even though was on other side of the world
    • Negotiated into it over a couple of months
    • Knew could do the work, but not sure how the position would work out

Challenges

  • Discipline
    • Feels he is not organised. Doesn’t keep planner uptodate or todo lists etc
    • “You can spend a lot of time reading about time management without actually doing it”
    • Do you need to have the minimum level
  • Isolation
    • Lives 20 minutes out of Hobart
    • In semi-rural area for days at a time, doesn’t leave house all week except to ferry kids on weekends.
    • “Never considered myself an extrovert, but I do enjoy talking to people at least weekly”
    • Need to work to hook in with Hobart tech community, Goes to meetups. Plays D&D with friends.
    • Considering going to coworking space. sometimes goes to Cafes etc
  • Setting Boundries
    • Hard to Leave work.
    • Have a dedicated work space.
  • Internet Access
    • Prioritise Coverage over cost these days for mobile.
    • Sometimes fixed provider go down, need to have a backup
  • Communication
    • Less random communicated with other employees
    • Cannot assume any particular knowledge when talking with other people
    • Aware of particular cultural differences
    • Multiple chance of a miscommunication

Opportunities

  • Access to companies and jobs and technologies that could get locally
  • Access to people with a wider range of experiences and backgrounds

Finding remote work

  • Talk your way into it
  • Networking
  • Job Bof
  • stackoverflow.com/jobs can filter
  • weworkremotely.com

Making it work

  • Be Visable
  • Go home at the end of the day
  • Remember real people are at the end of the email

 

Categories: Aligned Planets