** Description changed:
============================================
SRU Justification:
1. Impact: cgroup-lite fails to start on systems with separate /usr
2. Development fix: move cgroup-{,u}mount commands to /bin
3. Stable fix: same as development fix
4. Test case:
1. install cgroup-lite and lxc
2. start a shell with /usr over-mounted
2a. sudo lxc-unshare -s MOUNT /bin/bash
2b. mount -t tmpfs tmpfs /usr
2c. /bin/cgroup-umount # look for errors
2d. look under /sys/fs/cgroup - cgroups should be mounted
2e. /bin/cgroup-mount # look for errors
2f. look under /sys/fs/cgroup - cgroups should be mounted
+ # (note, if you do 'start cgroup-lite from the private mounts
namespace, the mounts will only be seen in the host's (upstart's) namespace,
not your private namespace)
5. Regression potential: If done wrong, it could cause cgroup-lite to fail
to start or stop.
============================================
the initscript provided by cgroup-lite 1.1 doesn't work when /usr is on
separated partition.
$ sudo lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04
$ apt-cache policy cgroup-lite
cgroup-lite:
Installed: 1.1
Candidate: 1.1
Version table:
*** 1.1 0
500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
100 /var/lib/dpkg/status
with separated /usr partition:
$ mount | grep /usr
/dev/mapper/venkman-usr on /usr type ext4 (rw,noatime)
$ sudo service cgroup-lite status
cgroup-lite stop/waiting
$ mount | grep cgroup
with not separated /usr partition:
$ mount | grep /usr
$ sudo service cgroup-lite status
cgroup-lite start/running
$ mount | grep cgroup
cgroup on /sys/fs/cgroup type tmpfs (rw,relatime,mode=755)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,relatime,cpu)
cgroup on /sys/fs/cgroup/cpuacct type cgroup (rw,relatime,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,relatime,freezer)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,relatime,blkio)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,relatime,perf_event)
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https://bugs.launchpad.net/bugs/989354
Title:
cgroup-lite and separated /usr
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