Jie Yu created MESOS-3806:
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Summary: 'mount --make-rslave /' does not work as expected on
ubuntu 14.04
Key: MESOS-3806
URL: https://issues.apache.org/jira/browse/MESOS-3806
Project: Mesos
Issue Type: Bug
Reporter: Jie Yu
The linux filesystem isolator rely on 'mount --make-rslve /' to make sure the
mounts in the container (in a new mount namespace) does not propagate back to
the host mount namespace.
However, this command does not work as expected on ubuntu 14.04. Here is a
simple experiment:
{noformat}
$ cat /proc/self/mountinfo
42 22 8:1 /home/vagrant/tmp /home/vagrant/tmp rw,relatime shared:1 - ext4
/dev/disk/by-uuid/3af531bb-7c15-4e60-b23f-4853c47ccc91 rw,data=ordered
43 42 8:1 /home/vagrant/busybox /home/vagrant/tmp/mnt rw,relatime shared:2 -
ext4 /dev/disk/by-uuid/3af531bb-7c15-4e60-b23f-4853c47ccc91 rw,data=ordered
$ sudo unshare -m /bin/bash
# cat /proc/self/mountinfo
70 45 8:1 /home/vagrant/tmp /home/vagrant/tmp rw,relatime shared:1 - ext4
/dev/disk/by-uuid/3af531bb-7c15-4e60-b23f-4853c47ccc91 rw,data=ordered
71 70 8:1 /home/vagrant/busybox /home/vagrant/tmp/mnt rw,relatime shared:2 -
ext4 /dev/disk/by-uuid/3af531bb-7c15-4e60-b23f-4853c47ccc91 rw,data=ordered
# mount --make-rslave /home/vagrant/tmp
# cat /proc/self/mountinfo
70 45 8:1 /home/vagrant/tmp /home/vagrant/tmp rw,relatime master:1 - ext4
/dev/disk/by-uuid/3af531bb-7c15-4e60-b23f-4853c47ccc91 rw,data=ordered
71 70 8:1 /home/vagrant/busybox /home/vagrant/tmp/mnt rw,relatime shared:2 -
ext4 /dev/disk/by-uuid/3af531bb-7c15-4e60-b23f-4853c47ccc91 rw,data=ordered
{noformat}
If you repeat the above commands on CentOS, the command works as expected.
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