Public bug reported: [Summary]
dockerd has a umask of 0177 when running inside a lxd container. This causes the file created win /var/lib/docker to only be accessible by root which in term causes permission errors for non-root users within the docker containers. [Machines] Installed docker.io both inside a lxd container and inside a VirtualBox virtual machine. 1. LXD Host running: Ubuntu 16.04.2 LTS, lxd 2.15-0ubuntu6~ubuntu16.04.1 LXD container: Ubuntu 16.04.2 LTS, docker.io 1.12.6-0ubuntu1~16.04.1 Docker: Storage driver default 'vfs' 2. VirtualBox Host running: MacOS Sierra 10.12.6, VirtualBox 5.1.26 Virtual machine: Ubuntu 16.04.3 LTS, docker.io 1.12.6-0ubuntu1~16.04.1 Docker: Storage driver set to vfs in /etc/docker/daemon.json: { "storage-driver": "vfs" } [Test] Used gdb to check the effective umask of dockerd in each case: 1. LXD # gdb --pid 1234 ... (gdb) call/o umask(0) $1 = 0177 (gdb) 2. VirtualBox # gdb --pid 1234 ... (gdb) call/o umask(0) $1 = 022 (gdb) [Permissons] 1. LXD /var/lib/docker# ls -l total 22 drwx------ 4 root root 4 Aug 3 10:11 containers drw------- 3 root root 3 Jul 31 14:20 image drw------- 3 root root 3 Jul 31 14:20 network drw------- 2 root root 2 Jul 31 14:20 swarm drwx------ 2 root root 2 Aug 3 09:23 tmp drw------- 2 root root 2 Jul 31 14:20 trust drw------- 3 root root 3 Jul 31 14:21 vfs drw------- 2 root root 3 Aug 3 09:22 volumes Images in vfs/dir/xxxx are mode drw------- 2. VirtualBox /var/lib/docker# ls -l total 36 drwx------ 5 root root 4 Aug 3 10:11 aufs drwx------ 2 root root 4 Aug 3 10:11 containers drwx------ 4 root root 3 Jul 31 14:20 image drwxr-x--- 3 root root 3 Jul 31 14:20 network drwx------ 2 root root 2 Jul 31 14:20 swarm drwx------ 2 root root 2 Aug 3 09:23 tmp drwx------ 2 root root 2 Jul 31 14:20 trust drwx------ 3 root root 3 Jul 31 14:21 vfs drwx------ 2 root root 3 Aug 3 09:22 volumes Images in vfs/dir/xxxxx are mode drwxr-xr-x ** Affects: docker.io (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1708445 Title: dockerd umask inside lxd container To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1708445/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs