Docker Container Quotes

A union mount is a mount that allows several filesystems to be mounted at one time but appear to be one filesystem. The union mount overlays the filesystems on top of one another so that the resulting filesystem may contain files and subdirectories from any or all of the underlying filesystems.

If you need to run multiple processes or commands as part of starting a container you should use a service management tool like Supervisor.

If deploying software is hard, time-consuming, and requires resources from another team, then developers will often build everything into the existing application in order to avoid suffering the new deployment penalty.

This could theoretically be achieved by provisioning a bare metal server, loading on a standard Linux distribution (or a more dedicated one for containers such as CoreOS or RancherOS), and running Docker or another container system on top of that. This idea has some advantages over bare metal alone, like being able to subdivide hardware. Unfortunately, it still lacks the orchestration and management capabilities provided by OpenStack.

While not supported currently, it is also possible that other container formats like Rocket could allow you to use Magnum without Docker at all

The container is now deleted — literally wiped off the face of the planet. If it was a good container, it becomes a serverless function in the afterlife. If it was a naughty container, it becomes a dumb terminal :-D

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While Docker automatically captures logs for you, it does not also rotate them. In fact, currently none of the provided packages set up any log rotation. You’ll need to do that yourself in most cases. Rather frustratingly, Docker also does not respond to a signal to tell it to reopen logs. If you send it the standard HUP signal, it will instead restart all the containers, which is not what you want. The current best practice for rotation of Docker logs is to have logrotate use the copytruncate method to copy the logfile and then truncate it in place. There are open bugs against docker asking for a better solution.