What happens when the docker host restarts?
will the images that were running be restarted?
Docker will restart containers when the daemon restarts if you pass -r=True
to the startup options. On Ubuntu, you can accomplish this permanently by modifying DOCKER_OPTS="-r=true"
in /etc/default/docker
.
will the changes that were made to those images persist, or will a new instance of the image be spawned and changes be lost?
Containers will be stopped. Any modifications to the container will still be present when the container next starts, which will happen automatically when the docker daemon starts if -r=true
is provided as mentioned above.
where is the docker configuration stored on the host system?
There is no configuration file per se. You can tune the upstart/init options in /etc/default/docker
.
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Mildred
Updated on June 22, 2022Comments
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Mildred almost 2 years
What happens when the docker host is shut down and restarted?
- will the images that were running be restarted?
- will the changes that were made to those images persist, or will a new instance of the image be spawned and changes be lost?
- does docker have any configuration option, such as the list of images to be automatically executed at startup and the options to run the images? Where? If not, I suppose only the docker command line can be used to alter docker state. Where is that state stored (I suppose somewhere in
/var
). This could be useful to backup the docker state.
(I'd have liked to find this in the FAQ)
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Robert almost 10 yearsDid you find a solution ?
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Mildred almost 10 yearsI think it should work if it wasn't for this bug: stackoverflow.com/a/18797089/174011
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Mildred almost 10 years
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Mildred over 9 yearsSee also: blog.sogilis.com/post/94520400771/…
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Mildred almost 10 yearsI was not talking about the init system configuration for docker but the docker configuration in itself. I modified the question to make it clearer.
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Mildred almost 10 yearsThe
--restart
or-r
option is indeed what I was interested in. It is now the default according to stackoverflow.com/a/18797089/174011 -
Kings85 about 5 yearsObvious but important comment: if the container is run with --rm, then the container will be stopped and automatically be removed, so all changes will be lost