From 212fe5f2d05524bae59a737b9975e07d16b1bb16 Mon Sep 17 00:00:00 2001 From: Dan Walsh Date: Wed, 28 Oct 2015 09:19:51 -0400 Subject: [PATCH] Relabel BTRFS Content on container Creation This change will allow us to run SELinux in a container with BTRFS back end. We continue to work on fixing the kernel/BTRFS but this change will allow SELinux Security separation on BTRFS. It basically relabels the content on container creation. Just relabling -init directory in BTRFS use case. Everything looks like it works. I don't believe tar/achive stores the SELinux labels, so we are good as far as docker commit. Tested Speed on startup with BTRFS on top of loopback directory. BTRFS not on loopback should get even better perfomance on startup time. The more inodes inside of the container image will increase the relabel time. This patch will give people who care more about security the option of runnin BTRFS with SELinux. Those who don't want to take the slow down can disable SELinux either in individual containers or for all containers by continuing to disable SELinux in the daemon. Without relabel: > time docker run --security-opt label:disable fedora echo test test real 0m0.918s user 0m0.009s sys 0m0.026s With Relabel test real 0m1.942s user 0m0.007s sys 0m0.030s Signed-off-by: Dan Walsh Signed-off-by: Dan Walsh --- man/docker-daemon.8.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/man/docker-daemon.8.md b/man/docker-daemon.8.md index 31e20c7c67..de16f6849e 100644 --- a/man/docker-daemon.8.md +++ b/man/docker-daemon.8.md @@ -191,7 +191,7 @@ unix://[/path/to/socket] to use. Force the Docker runtime to use a specific storage driver. **--selinux-enabled**=*true*|*false* - Enable selinux support. Default is false. SELinux does not presently support the BTRFS storage driver. + Enable selinux support. Default is false. SELinux does not presently support the overlay storage driver. **--storage-opt**=[] Set storage driver options. See STORAGE DRIVER OPTIONS.