Continuing the discussion from Docker using a lot of CPU: [image]Docker using a lot of CPU > Looks like one should be rather conservative in upgrading docker? Being conservative in upgrading docker isn’t even enough; we follow that policy (still on 17.06), and we still got hit by a ripper of a bug that exists in all versions from 17.06 to 17.11 (and, by the glacial pace at which the PR is moving, will probably be in 18.01 or whatever the next release will be). Basically, Docker’s gonna Docker, and all we can do is hang on for the ride and try and dodge the worst of the low-hanging tree branches. I had made a mental not that I’ll eventuall need to allow my instance to upgrade docker again, after downgrading because of that bug, but I’m not sure when I should do that nor how I do it without breaking stuff… Or do I need to do anything?

Is 17.06 still the recommended? We’re on 17.10.0-ce ourselves. If you’ve installed via apt it’s relatively straightforward, uninstall, reboot: sudo apt-get autoremove -y docker-ce \ & sudo apt-get purge docker-ce -y \ & sudo rm -rf /etc/docker/ \ & sudo rm -f /etc/systemd/system/multi-user.target.wants/docker.service \ & sudo rm -rf /var/lib/docker \ & sudo systemctl daemon-reload then use: sudo apt-cache policy docker-ce to see which versions are available to apt, and then: sudo apt-get install -y docker-ce=[build string] to install a specific version. Checking our install we can see builds ranging from 17.04.0-ce all the way up to 18.04.0-ce: docker-ce: Installed: 17.10.0~ce-0~ubuntu Candidate: 18.04.0~ce~3-0~ubuntu Version table: 18.04.0~ce~3-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 18.03.1~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 18.03.0~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 18.02.0~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 18.01.0~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.12.1~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.12.0~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.11.0~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages *** 17.10.0~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 100 /var/lib/dpkg/status 17.09.1~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.09.0~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.07.0~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.06.2~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.06.1~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.06.0~ce-0~ubuntu 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.05.0~ce-0~ubuntu-xenial 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages 17.04.0~ce-0~ubuntu-xenial 500 500 https://download.docker.com/linux/ubuntu xenial/edge amd64 Packages

We’re on version 18.04.0-ce, build 3d479c0 across at least 5 known good instances. Haven’t had any issues due to docker yet!

[image] itsbhanusharma: Haven’t had any issues due to docker yet! Pretty much a guaranteed way to jinx your installs! Seriously though, over the past few years we’ve had a number of run-ins with docker versions. Even if instances appear to be building and running ok there have been plenty of performance issues between versions. Running doesn’t necessarily mean running well.

I’d totally agree to that, There have been multiple edge cases and other complaints due to people being on a specific version of docker which contains some bug. About the performance part, I haven’t really invested myself into creating stats for known good and the delta between those and the latest so I can’t say much but I never had it trigger any alerts for me. I’m however curious to know what strategy you use to observe the performance metrics for docker in relation to discourse?

Usually the difference is observable from whatever server management you use, we’ve got everything in either AWS or DO and most of it is hooked up into New Relic. If there’s a performance difference there’s also usually an observable step up or down in CPU usage. We’ve not gone so far as to look at transaction times, but as these machines only run Discourse it’s very easy to see if a docker version has an impact on load.

Well, @mpalmer seemed to think differently, and he seemed to suggest that that is not what you’re doing: [image]Docker using a lot of CPU we follow that policy (still on 17.06) But okay. So my question then is: is there still a reason not to use the latest version?

I provide insights into our environment, processes, and decision-making for informational purposes only, unless clearly stated otherwise. What we at CDCK do, given our scale, priorities, and the skills and experience of our team, is not necessarily a good idea for everyone else, whose circumstances are likely very different. That’s the “unless you have specific reasons not to” in Jeff’s post.

Yes, I understand. I was just wondering whether such reasons currently exist.

I’d interpret that as “specific reasons that your installation of Discourse is different from ‘Most’ installations of Discourse”. Or “you should already know if this applies to you” or “your sysadmin said you need to hold back the upgrade” or …

When to upgrade docker (and how)?

Product Support

codinghorror (Jeff Atwood) May 8, 2018, 11:59pm 7

I would use latest Docker unless you have specific reasons not to.

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When to upgrade docker (and how)?

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