最後更新: 2020-04-28

cgroup v2 介紹

# Linux 4.5

cgroups v2 及 v1 可以同時存在

v2 = unified cgroup hierarchy

 * The unified CGroup hierarchy does not have CGroup V1 device controllers.

目錄

• Check Kernel support V2
• 查看系統使用 V1 還是 V2
• 設定使用 V1

Check Kernel support V2

grep cgroup /proc/filesystems

nodev   cgroup
nodev   cgroup2

查看系統使用 V1 還是 V2

Identify the cgroup version on Linux Nodes

stat -fc %T /sys/fs/cgroup/

• For cgroup v2, the output is cgroup2fs
• For cgroup v1, the output is tmpfs

設定使用 V1

# RHEL 8

/etc/default/grub

GRUB_CMDLINE_LINUX="... systemd.unified_cgroup_hierarchy=0"

grub2-mkconfig -o /boot/grub2/grub.cfg

Controllers are available for cgroups-v2

 * A resource controller can be used either in a cgroups-v1 hierarchy or a cgroups-v2 hierarchy,

    not simultaneously in both.

• blkio
• memory
• pids
• rdma
• cpu
• cpuset
• perf_event

LXC

LXC >= 3.0.0 support CGroupV2