Re: [libvirt] failed to mount cgroup

Exactly, the mount point could also be /cgroup. The difference is the mount type. Scenario 1 could work with both libvirt-0.10.x and higher version. Scenario 2 could work with libvirt-0.10.x but failed with higher version. What's limitation with 'mount -t cgroup cgroup /cgroup'? 1. # mount -t tmpfs cgroup /cgroup # mkdir /cgroup/{freezer,devices,memory,cpuacct,cpuset} # mount -t cgroup -ofreezer cgroup /cgroup/freezer # mount -t cgroup -odevices cgroup /cgroup/devices # mount -t cgroup -omemory cgroup /cgroup/memory # mount -t cgroup -ocpuacct cgroup /cgroup/cpuacct # mount -t cgroup -ocpuset cgroup /cgroup/cpuset # cat /proc/mounts rootfs / rootfs rw 0 0 /dev/root / ext2 rw,relatime 0 0 proc /proc proc rw,relatime 0 0 sysfs /sys sysfs rw,relatime 0 0 none /dev tmpfs rw,relatime,mode=755 0 0 devpts /dev/pts devpts rw,relatime,gid=5,mode=620,ptmxmode=000 0 0 tmpfs /var/volatile tmpfs rw,relatime 0 0 tmpfs /media/ram tmpfs rw,relatime 0 0 cgroup /cgroup tmpfs rw,relatime 0 0 cgroup /cgroup/freezer cgroup rw,relatime,freezer 0 0 cgroup /cgroup/devices cgroup rw,relatime,devices 0 0 cgroup /cgroup/memory cgroup rw,relatime,memory 0 0 cgroup /cgroup/cpuacct cgroup rw,relatime,cpuacct 0 0 cgroup /cgroup/cpuset cgroup rw,relatime,cpuset 0 0 # mount rootfs on / type rootfs (rw) /dev/root on / type ext2 (rw,relatime) proc on /proc type proc (rw,relatime) sysfs on /sys type sysfs (rw,relatime) none on /dev type tmpfs (rw,relatime,mode=755) devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /var/volatile type tmpfs (rw,relatime) tmpfs on /media/ram type tmpfs (rw,relatime) cgroup on /cgroup type tmpfs (rw,relatime) cgroup on /cgroup/freezer type cgroup (rw,relatime,freezer) cgroup on /cgroup/devices type cgroup (rw,relatime,devices) cgroup on /cgroup/memory type cgroup (rw,relatime,memory) cgroup on /cgroup/cpuacct type cgroup (rw,relatime,cpuacct) cgroup on /cgroup/cpuset type cgroup (rw,relatime,cpuset) # cat /proc/cgroups #subsys_name hierarchy num_cgroups enabled cpuset 6 1 1 cpuacct 5 1 1 memory 4 1 1 devices 3 1 1 freezer 2 1 1 2. # mkdir /cgroup # mount -t cgroup cgroup /cgroup # cat /proc/mounts rootfs / rootfs rw 0 0 /dev/root / ext2 rw,relatime 0 0 proc /proc proc rw,relatime 0 0 sysfs /sys sysfs rw,relatime 0 0 none /dev tmpfs rw,relatime,mode=755 0 0 devpts /dev/pts devpts rw,relatime,gid=5,mode=620,ptmxmode=000 0 0 tmpfs /var/volatile tmpfs rw,relatime 0 0 tmpfs /media/ram tmpfs rw,relatime 0 0 cgroup /cgroup cgroup rw,relatime,freezer,devices,memory,cpuacct,cpuset 0 0 # mount rootfs on / type rootfs (rw) /dev/root on / type ext2 (rw,relatime) proc on /proc type proc (rw,relatime) sysfs on /sys type sysfs (rw,relatime) none on /dev type tmpfs (rw,relatime,mode=755) devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /var/volatile type tmpfs (rw,relatime) tmpfs on /media/ram type tmpfs (rw,relatime) cgroup on /cgroup type cgroup (rw,relatime,freezer,devices,memory,cpuacct,cpuset) # cat /proc/cgroups #subsys_name hierarchy num_cgroups enabled cpuset 1 1 1 cpuacct 1 1 1 memory 1 1 1 devices 1 1 1 freezer 1 1 1 Best Regards, Olivia