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Added more information on nsenter / docker-enter

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Added another, easier, install method for nsenter and some information on the usage of nsenter / docker-enter.
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David Klotz 2014-08-13 16:11:08 +02:00
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README.md
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@ -133,12 +133,15 @@ There doesn't seem to be a way to use docker directly to import files into a con
The "official" way to enter a docker container while it's running is to use `nsenter`, which uses [libcontainer under the hood](http://jpetazzo.github.io/2014/03/23/lxc-attach-nsinit-nsenter-docker-0-9/). Using an `sshd` daemon is [considered evil](http://jpetazzo.github.io/2014/06/23/docker-ssh-considered-evil/).
Unfortunately, nsenter requires some configuration and installation. Here's how to do it on MacOS:
Unfortunately, nsenter requires some configuration and installation. If your operating system does not include nsenter (usually in a package named util-linux or similar, although it has to be quite a recent version), the easiest way is probably to install it through docker, as described in the first of the following links:
* [Installing nsenter using docker](https://github.com/jpetazzo/nsenter)
* [How to enter a Docker container](https://blog.codecentric.de/en/2014/07/enter-docker-container/)
* [Docker debug with nsenter on boot2docker](http://blog.sequenceiq.com/blog/2014/07/05/docker-debug-with-nsenter-on-boot2docker/)
I can't quite figure out why you'd want to use `nsenter` over `docker attach`. This would be a good place for an editor to submit a pull request.
`nsenter` allows you to run any command (e.g. a shell) inside a container that's already running another command (e.g. your database or webserver). This allows you to see all mounted volumes, check on processes, log files etc. inside a running container.
The first installation method described above also installs a small wrapper script wrapping `nsenter` named `docker-enter` that makes executing a shell inside a running container as easy as `docker-enter CONTAINER` and any other command via `docker-enter CONTAINER COMMAND`.
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