wiki:TipAndDoc/Linux/LXC/munin-plugins

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Version 2 (modified by mitty, 8 years ago) (diff)
--

munin plugin
lxc_proc
1. Debian 6.0
2. Ubuntu 12.04

munin plugin

lxc_proc

github:vajtsz/munin-plugins/blob/6a426b4bde7addcaf42d72a033e713d0f11776c0/squeeze/lxc_proc#L77
- Debian Squeezeと異なり、Ubuntu 12.04ではlxc-cgroup -t container_name tasksが使えない

https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt
Each cgroup is represented by a directory in the cgroup file system containing the following files describing that cgroup:
- tasks: list of tasks (by pid) attached to that cgroup. This list is not guaranteed to be sorted. Writing a thread id into this file moves the thread into this cgroup.
- cgroup.procs: list of tgids in the cgroup. This list is not guaranteed to be sorted or free of duplicate tgids, and userspace should sort/uniquify the list if this property is required. Writing a thread group id into this file moves all threads in that group into this cgroup.
- notify_on_release flag: run the release agent on exit?
- release_agent: the path to use for release notifications (this file exists in the top cgroup only)

まとめ
- lxc-cgroupコマンドを使わない場合、以下のsysfsにアクセスすると良い模様
- Debian 6.0: /sys/fs/cgroup/<container>/tasks
- Ubuntu 12.04 with fstab: /sys/fs/cgroup/lxc/<container>/tasks
- Ubuntu 12.04 with cgroup-lite: /sys/fs/cgroup/cpuacct/lxc/<container>/tasks
- Ubuntu 12.04 with cgroup-bin: /sys/fs/cgroup/cpuacct/sysdefault/lxc/<container>/tasks

Debian 6.0

http://wiki.debian.org/LXC
Add this line to /etc/fstab
```
cgroup  /sys/fs/cgroup  cgroup  defaults  0   0
```
Try to mount it (a reboot solves an eventual "resource busy problem" in any case)
```
mount /sys/fs/cgroup
```

$ sudo lxc-start -d -n lxc-test
$ sudo lxc-cgroup -n lxc-test tasks
```
1432
1569
1571
1598
```

$ ls -1F /sys/fs/cgroup/

cgroup.procs
cpuacct.stat
cpuacct.usage
cpuacct.usage_percpu
cpuset.cpu_exclusive
cpuset.cpus
cpuset.mem_exclusive
cpuset.mem_hardwall
cpuset.memory_migrate
cpuset.memory_pressure
cpuset.memory_pressure_enabled
cpuset.memory_spread_page
cpuset.memory_spread_slab
cpuset.mems
cpuset.sched_load_balance
cpuset.sched_relax_domain_level
cpu.shares
devices.allow
devices.deny
devices.list
lxc-test/
net_cls.classid
notify_on_release
release_agent
tasks

/sys/fs/cgroup/lxc-test/ も同じ構造

$ cat /sys/fs/cgroup/lxc-test/tasks
```
1432
1569
1571
1598
```

Ubuntu 12.04

Ubuntu 12.04 with aptitude install -R lxc
- cgroup関係のパッケージは-Rをつけるとインストールされない
$ ls -1F /sys/fs/cgroup/
- N/A
$ sudo lxc-start -n lxc-test
```
lxc-start: failed to spawn 'lxc-test'
```

/etc/fstab

Ubuntu 12.04 with /etc/fstab:cgroup /sys/fs/cgroup cgroup defaults 0 0
- 起動時に自動でマウントされないため、mount -aする必要がある

$ sudo mount -a
$ sudo lxc-start -d -n lxc-test

$ sudo lxc-cgroup -n lxc-test tasks

lxc-cgroup: cgroup is not mounted
lxc-cgroup: failed to retrieve value of 'tasks' for 'lxc-test'

$ ls -1F /sys/fs/cgroup/

blkio.io_merged
blkio.io_queued
blkio.io_service_bytes
blkio.io_serviced
blkio.io_service_time
blkio.io_wait_time
blkio.reset_stats
blkio.sectors
blkio.throttle.io_service_bytes
blkio.throttle.io_serviced
blkio.throttle.read_bps_device
blkio.throttle.read_iops_device
blkio.throttle.write_bps_device
blkio.throttle.write_iops_device
mitty@lein:~$ ls -1F /sys/fs/cgroup/
blkio.io_merged
blkio.io_queued
blkio.io_service_bytes
blkio.io_serviced
blkio.io_service_time
blkio.io_wait_time
blkio.reset_stats
blkio.sectors
blkio.throttle.io_service_bytes
blkio.throttle.io_serviced
blkio.throttle.read_bps_device
blkio.throttle.read_iops_device
blkio.throttle.write_bps_device
blkio.throttle.write_iops_device
blkio.time
blkio.weight
blkio.weight_device
cgroup.clone_children
cgroup.event_control
cgroup.procs
cpuacct.stat
cpuacct.usage
cpuacct.usage_percpu
cpu.cfs_period_us
cpu.cfs_quota_us
cpu.rt_period_us
cpu.rt_runtime_us
cpuset.cpu_exclusive
cpuset.cpus
cpuset.mem_exclusive
cpuset.mem_hardwall
cpuset.memory_migrate
cpuset.memory_pressure
cpuset.memory_pressure_enabled
cpuset.memory_spread_page
cpuset.memory_spread_slab
cpuset.mems
cpuset.sched_load_balance
cpuset.sched_relax_domain_level
cpu.shares
cpu.stat
devices.allow
devices.deny
devices.list
lxc/
memory.failcnt
memory.force_empty
memory.limit_in_bytes
memory.max_usage_in_bytes
memory.memsw.failcnt
memory.memsw.limit_in_bytes
memory.memsw.max_usage_in_bytes
memory.memsw.usage_in_bytes
memory.move_charge_at_immigrate
memory.numa_stat
memory.oom_control
memory.soft_limit_in_bytes
memory.stat
memory.swappiness
memory.usage_in_bytes
memory.use_hierarchy
notify_on_release
release_agent
tasks

/sys/fs/cgroup/lxc/, /sys/fs/cgroup/lxc/lxc-test/ も同じ構造

$ cat /sys/fs/cgroup/lxc/lxc-test/tasks

cgroup-lite

Ubuntu 12.04 with cgroup-lite
- aptitude install時に-Rとしない場合、cgroup-liteがRecommendsからインストールされる
- /bin/cgroups-mount
```
mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
```

$ sudo lxc-cgroup -n lxc-test tasks

lxc-cgroup: cgroup is not mounted
lxc-cgroup: failed to retrieve value of 'tasks' for 'lxc-test'

$ ls -1F /sys/fs/cgroup/

blkio/
cpu/
cpuacct/
cpuset/
devices/
freezer/
memory/
perf_event/

$ find /sys/fs/cgroup/ | grep lxc-test/tasks | xargs wc

17 17 102 /sys/fs/cgroup/perf_event/lxc/lxc-test/tasks
17 17 102 /sys/fs/cgroup/blkio/lxc/lxc-test/tasks
17 17 102 /sys/fs/cgroup/freezer/lxc/lxc-test/tasks
17 17 102 /sys/fs/cgroup/devices/lxc/lxc-test/tasks
17 17 102 /sys/fs/cgroup/memory/lxc/lxc-test/tasks
17 17 102 /sys/fs/cgroup/cpuacct/lxc/lxc-test/tasks
17 17 102 /sys/fs/cgroup/cpu/lxc/lxc-test/tasks
17 17 102 /sys/fs/cgroup/cpuset/lxc/lxc-test/tasks

$ cat /sys/fs/cgroup/perf_event/lxc/lxc-test/tasks

cgroup-bin

Ubuntu 12.04 with cgroup-bin
- cgroup-binとcgroup-liteはコンフリクトする
- /etc/init/cgconfig.conf
```
mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroups /sys/fs/cgroup
```

$ sudo lxc-cgroup -n lxc-test tasks

lxc-cgroup: cgroup is not mounted
lxc-cgroup: failed to retrieve value of 'tasks' for 'lxc-test'

$ ls -1F /sys/fs/cgroup/

cpu/
cpuacct/
devices/
freezer/
memory/

$ find /sys/fs/cgroup/ | grep lxc-test/tasks | xargs wc

16 16 80 /sys/fs/cgroup/freezer/sysdefault/lxc/lxc-test/tasks
16 16 80 /sys/fs/cgroup/memory/sysdefault/lxc/lxc-test/tasks
16 16 80 /sys/fs/cgroup/devices/sysdefault/lxc/lxc-test/tasks
16 16 80 /sys/fs/cgroup/cpuacct/sysdefault/lxc/lxc-test/tasks
16 16 80 /sys/fs/cgroup/cpu/sysdefault/lxc/lxc-test/tasks

$ cat /sys/fs/cgroup/freezer/sysdefault/lxc/lxc-test/tasks

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