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October 18, 2024 07:32
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| W1018 07:27:12.724757 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/root / ext2 ro,relatime 0 0 | |
| W1018 07:27:12.724794 1105 e2e_node_suite_test.go:207] /proc/mounts: devtmpfs /dev devtmpfs rw,nosuid,noexec,relatime,size=2004204k,nr_inodes=501051,mode=755 0 0 | |
| W1018 07:27:12.724806 1105 e2e_node_suite_test.go:207] /proc/mounts: proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.724815 1105 e2e_node_suite_test.go:207] /proc/mounts: sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.724825 1105 e2e_node_suite_test.go:207] /proc/mounts: securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.724834 1105 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /dev/shm tmpfs rw,nosuid,nodev,noexec 0 0 | |
| W1018 07:27:12.724843 1105 e2e_node_suite_test.go:207] /proc/mounts: devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 | |
| W1018 07:27:12.724857 1105 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /run tmpfs rw,nosuid,nodev,size=803108k,nr_inodes=819200,mode=755 0 0 | |
| W1018 07:27:12.724916 1105 e2e_node_suite_test.go:207] /proc/mounts: cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0 | |
| W1018 07:27:12.724932 1105 e2e_node_suite_test.go:207] /proc/mounts: pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.724941 1105 e2e_node_suite_test.go:207] /proc/mounts: bpf /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 0 0 | |
| W1018 07:27:12.724949 1105 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /etc/machine-id tmpfs ro,size=803108k,nr_inodes=819200,mode=755 0 0 | |
| W1018 07:27:12.724958 1105 e2e_node_suite_test.go:207] /proc/mounts: systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=31,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=378 0 0 | |
| W1018 07:27:12.724967 1105 e2e_node_suite_test.go:207] /proc/mounts: hugetlbfs /dev/hugepages hugetlbfs rw,nosuid,nodev,relatime,pagesize=2M 0 0 | |
| W1018 07:27:12.724976 1105 e2e_node_suite_test.go:207] /proc/mounts: mqueue /dev/mqueue mqueue rw,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.724985 1105 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /mnt/disks tmpfs rw,relatime,size=256k,mode=755 0 0 | |
| W1018 07:27:12.724995 1105 e2e_node_suite_test.go:207] /proc/mounts: debugfs /sys/kernel/debug debugfs rw,nosuid,nodev,noexec,relatime,gid=605,mode=750 0 0 | |
| W1018 07:27:12.725004 1105 e2e_node_suite_test.go:207] /proc/mounts: efivarfs /sys/firmware/efi/efivars efivarfs rw,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.725013 1105 e2e_node_suite_test.go:207] /proc/mounts: tracefs /sys/kernel/tracing tracefs rw,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.725022 1105 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /tmp tmpfs rw 0 0 | |
| W1018 07:27:12.725031 1105 e2e_node_suite_test.go:207] /proc/mounts: configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.725041 1105 e2e_node_suite_test.go:207] /proc/mounts: fusectl /sys/fs/fuse/connections fusectl rw,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.725050 1105 e2e_node_suite_test.go:207] /proc/mounts: overlayfs /etc overlay rw,relatime,lowerdir=/etc,upperdir=/tmp/etc_overlay/etc,workdir=/tmp/etc_overlay/.work,uuid=on 0 0 | |
| W1018 07:27:12.725066 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda8 /usr/share/oem ext4 ro,nosuid,nodev,noexec,relatime 0 0 | |
| W1018 07:27:12.725081 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda1 /mnt/stateful_partition ext4 rw,nosuid,nodev,noexec,relatime,commit=30 0 0 | |
| W1018 07:27:12.725090 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda1 /home ext4 rw,nosuid,nodev,noexec,relatime,commit=30 0 0 | |
| W1018 07:27:12.725099 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda1 /var ext4 rw,nosuid,nodev,noexec,relatime,commit=30 0 0 | |
| W1018 07:27:12.725107 1105 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /var/lib/cloud tmpfs rw,nosuid,nodev,relatime,size=2048k,mode=755 0 0 | |
| W1018 07:27:12.725115 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda1 /var/lib/containerd ext4 rw,nosuid,nodev,relatime,commit=30 0 0 | |
| W1018 07:27:12.725123 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda1 /var/lib/docker ext4 rw,nosuid,nodev,relatime,commit=30 0 0 | |
| W1018 07:27:12.725131 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda1 /var/lib/google ext4 rw,nosuid,nodev,relatime,commit=30 0 0 | |
| W1018 07:27:12.725139 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda1 /var/lib/toolbox ext4 rw,nodev,relatime,commit=30 0 0 | |
| W1018 07:27:12.725149 1105 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda1 /home/containerd ext4 rw,nosuid,nodev,relatime,commit=30 0 0 | |
| W1018 07:27:12.725210 1105 e2e_node_suite_test.go:220] /proc/mounts: #subsys_name hierarchy num_cgroups enabled | |
| W1018 07:27:12.725228 1105 e2e_node_suite_test.go:220] /proc/mounts: cpuset 0 85 1 | |
| W1018 07:27:12.725237 1105 e2e_node_suite_test.go:220] /proc/mounts: cpu 0 85 1 | |
| W1018 07:27:12.725247 1105 e2e_node_suite_test.go:220] /proc/mounts: cpuacct 0 85 1 | |
| W1018 07:27:12.725256 1105 e2e_node_suite_test.go:220] /proc/mounts: blkio 0 85 1 | |
| W1018 07:27:12.725265 1105 e2e_node_suite_test.go:220] /proc/mounts: memory 0 85 1 | |
| W1018 07:27:12.725273 1105 e2e_node_suite_test.go:220] /proc/mounts: devices 0 85 1 | |
| W1018 07:27:12.725282 1105 e2e_node_suite_test.go:220] /proc/mounts: freezer 0 85 1 | |
| W1018 07:27:12.725290 1105 e2e_node_suite_test.go:220] /proc/mounts: net_cls 0 85 1 | |
| W1018 07:27:12.725298 1105 e2e_node_suite_test.go:220] /proc/mounts: perf_event 0 85 1 | |
| W1018 07:27:12.725306 1105 e2e_node_suite_test.go:220] /proc/mounts: net_prio 0 85 1 | |
| W1018 07:27:12.725314 1105 e2e_node_suite_test.go:220] /proc/mounts: hugetlb 0 85 1 | |
| W1018 07:27:12.725321 1105 e2e_node_suite_test.go:220] /proc/mounts: pids 0 85 1 | |
| W1018 07:27:12.725330 1105 e2e_node_suite_test.go:220] /proc/mounts: rdma 0 85 1 | |
| F1018 07:27:12.725362 1105 e2e_node_suite_test.go:226] open proc mounts failed: open /sys/fs/cgroup/unified/cgroup.controllers: no such file or directory |
cgroup v1 example, with /sys/fs/cgroup/unified cgroup2
W1018 07:31:15.935242 3121 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda4 /sysroot xfs ro,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
W1018 07:31:15.935277 3121 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda4 / xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
W1018 07:31:15.935286 3121 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda4 /etc xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
W1018 07:31:15.935294 3121 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda4 /usr xfs ro,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
W1018 07:31:15.935303 3121 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda4 /sysroot/ostree/deploy/fedora-coreos/var xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
W1018 07:31:15.935315 3121 e2e_node_suite_test.go:207] /proc/mounts: devtmpfs /dev devtmpfs rw,seclabel,nosuid,size=4096k,nr_inodes=487413,mode=755,inode64 0 0
W1018 07:31:15.935325 3121 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /dev/shm tmpfs rw,seclabel,nosuid,nodev,inode64 0 0
W1018 07:31:15.935332 3121 e2e_node_suite_test.go:207] /proc/mounts: devpts /dev/pts devpts rw,seclabel,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
W1018 07:31:15.935340 3121 e2e_node_suite_test.go:207] /proc/mounts: sysfs /sys sysfs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935349 3121 e2e_node_suite_test.go:207] /proc/mounts: securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935357 3121 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /sys/fs/cgroup tmpfs ro,seclabel,nosuid,nodev,noexec,size=4096k,nr_inodes=1024,mode=755,inode64 0 0
W1018 07:31:15.935365 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup2 /sys/fs/cgroup/unified cgroup2 rw,seclabel,nosuid,nodev,noexec,relatime,nsdelegate 0 0
W1018 07:31:15.935373 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/systemd cgroup rw,seclabel,nosuid,nodev,noexec,relatime,xattr,name=systemd 0 0
W1018 07:31:15.935381 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/perf_event cgroup rw,seclabel,nosuid,nodev,noexec,relatime,perf_event 0 0
W1018 07:31:15.935388 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/rdma cgroup rw,seclabel,nosuid,nodev,noexec,relatime,rdma 0 0
W1018 07:31:15.935397 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,seclabel,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
W1018 07:31:15.935404 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/memory cgroup rw,seclabel,nosuid,nodev,noexec,relatime,memory 0 0
W1018 07:31:15.935412 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,seclabel,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0
W1018 07:31:15.935420 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/devices cgroup rw,seclabel,nosuid,nodev,noexec,relatime,devices 0 0
W1018 07:31:15.935428 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/hugetlb cgroup rw,seclabel,nosuid,nodev,noexec,relatime,hugetlb 0 0
W1018 07:31:15.935439 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/blkio cgroup rw,seclabel,nosuid,nodev,noexec,relatime,blkio 0 0
W1018 07:31:15.935447 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/misc cgroup rw,seclabel,nosuid,nodev,noexec,relatime,misc 0 0
W1018 07:31:15.935455 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/pids cgroup rw,seclabel,nosuid,nodev,noexec,relatime,pids 0 0
W1018 07:31:15.935463 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/freezer cgroup rw,seclabel,nosuid,nodev,noexec,relatime,freezer 0 0
W1018 07:31:15.935471 3121 e2e_node_suite_test.go:207] /proc/mounts: cgroup /sys/fs/cgroup/cpuset cgroup rw,seclabel,nosuid,nodev,noexec,relatime,cpuset 0 0
W1018 07:31:15.935481 3121 e2e_node_suite_test.go:207] /proc/mounts: pstore /sys/fs/pstore pstore rw,seclabel,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935488 3121 e2e_node_suite_test.go:207] /proc/mounts: efivarfs /sys/firmware/efi/efivars efivarfs rw,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935496 3121 e2e_node_suite_test.go:207] /proc/mounts: bpf /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 0 0
W1018 07:31:15.935503 3121 e2e_node_suite_test.go:207] /proc/mounts: configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935511 3121 e2e_node_suite_test.go:207] /proc/mounts: proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935519 3121 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /run tmpfs rw,seclabel,nosuid,nodev,size=799836k,nr_inodes=819200,mode=755,inode64 0 0
W1018 07:31:15.935550 3121 e2e_node_suite_test.go:207] /proc/mounts: selinuxfs /sys/fs/selinux selinuxfs rw,nosuid,noexec,relatime 0 0
W1018 07:31:15.935559 3121 e2e_node_suite_test.go:207] /proc/mounts: systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=36,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=4570 0 0
W1018 07:31:15.935566 3121 e2e_node_suite_test.go:207] /proc/mounts: hugetlbfs /dev/hugepages hugetlbfs rw,seclabel,nosuid,nodev,relatime,pagesize=2M 0 0
W1018 07:31:15.935574 3121 e2e_node_suite_test.go:207] /proc/mounts: none /sys/kernel/debug debugfs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935582 3121 e2e_node_suite_test.go:207] /proc/mounts: mqueue /dev/mqueue mqueue rw,seclabel,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935590 3121 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /tmp tmpfs rw,seclabel,size=1999584k,nr_inodes=1048576,inode64 0 0
W1018 07:31:15.935598 3121 e2e_node_suite_test.go:207] /proc/mounts: tracefs /sys/kernel/tracing tracefs rw,seclabel,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935606 3121 e2e_node_suite_test.go:207] /proc/mounts: fusectl /sys/fs/fuse/connections fusectl rw,nosuid,nodev,noexec,relatime 0 0
W1018 07:31:15.935614 3121 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda4 /var xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
W1018 07:31:15.935622 3121 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda3 /boot ext4 ro,seclabel,nosuid,nodev,relatime 0 0
W1018 07:31:15.935629 3121 e2e_node_suite_test.go:207] /proc/mounts: sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
W1018 07:31:15.935636 3121 e2e_node_suite_test.go:207] /proc/mounts: overlay /usr overlay rw,seclabel,relatime,lowerdir=usr,upperdir=/var/tmp/ostree-unlock-ovl.4PARV2/upper,workdir=/var/tmp/ostree-unlock-ovl.4PARV2/work,uuid=on 0 0
W1018 07:31:15.935644 3121 e2e_node_suite_test.go:207] /proc/mounts: /dev/sda4 /var/lib/containers/storage/overlay xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
W1018 07:31:15.935652 3121 e2e_node_suite_test.go:207] /proc/mounts: tmpfs /run/user/1000 tmpfs rw,seclabel,nosuid,nodev,relatime,size=399916k,nr_inodes=99979,mode=700,uid=1000,gid=1000,inode64 0 0
W1018 07:31:15.935723 3121 e2e_node_suite_test.go:220] /proc/mounts: #subsys_name hierarchy num_cgroups enabled
W1018 07:31:15.935734 3121 e2e_node_suite_test.go:220] /proc/mounts: cpuset 13 1 1
W1018 07:31:15.935749 3121 e2e_node_suite_test.go:220] /proc/mounts: cpu 4 1 1
W1018 07:31:15.935757 3121 e2e_node_suite_test.go:220] /proc/mounts: cpuacct 4 1 1
W1018 07:31:15.935765 3121 e2e_node_suite_test.go:220] /proc/mounts: blkio 9 1 1
W1018 07:31:15.935773 3121 e2e_node_suite_test.go:220] /proc/mounts: memory 5 110 1
W1018 07:31:15.935782 3121 e2e_node_suite_test.go:220] /proc/mounts: devices 7 38 1
W1018 07:31:15.935790 3121 e2e_node_suite_test.go:220] /proc/mounts: freezer 12 1 1
W1018 07:31:15.935798 3121 e2e_node_suite_test.go:220] /proc/mounts: net_cls 6 1 1
W1018 07:31:15.935808 3121 e2e_node_suite_test.go:220] /proc/mounts: perf_event 2 1 1
W1018 07:31:15.935817 3121 e2e_node_suite_test.go:220] /proc/mounts: net_prio 6 1 1
W1018 07:31:15.935826 3121 e2e_node_suite_test.go:220] /proc/mounts: hugetlb 8 1 1
W1018 07:31:15.935835 3121 e2e_node_suite_test.go:220] /proc/mounts: pids 11 43 1
W1018 07:31:15.935843 3121 e2e_node_suite_test.go:220] /proc/mounts: rdma 3 1 1
W1018 07:31:15.935851 3121 e2e_node_suite_test.go:220] /proc/mounts: misc 10 1 1
Rocky 9.4
[root@paco ~]# cat /proc/cgroups
#subsys_name hierarchy num_cgroups enabled
cpuset 0 389 1
cpu 0 389 1
cpuacct 0 389 1
blkio 0 389 1
memory 0 389 1
devices 0 389 1
freezer 0 389 1
net_cls 0 389 1
perf_event 0 389 1
net_prio 0 389 1
hugetlb 0 389 1
pids 0 389 1
rdma 0 389 1
misc 0 389 1
[root@paco ~]# cat /proc/mounts | grep cgroup
cgroup2 /sys/fs/cgroup cgroup2 rw,seclabel,nosuid,nodev,noexec,relatime 0 0
none /run/cilium/cgroupv2 cgroup2 rw,seclabel,relatime 0 0
[root@paco ~]#
[root@paco ~]# uname -a
Linux paco 5.14.0-427.35.1.el9_4.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Sep 12 18:24:53 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
``
Red Hat 8
[root@localhost ~]# cat /proc/cgroups
#subsys_name hierarchy num_cgroups enabled
cpuset 7 52 1
cpu 5 62 1
cpuacct 5 62 1
blkio 3 62 1
memory 4 214 1
devices 10 141 1
freezer 11 52 1
net_cls 2 52 1
perf_event 9 52 1
net_prio 2 52 1
hugetlb 8 52 1
pids 12 169 1
rdma 6 52 1
[root@localhost ~]# cat /proc/mounts | grep cgroup
tmpfs /sys/fs/cgroup tmpfs ro,seclabel,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup rw,seclabel,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 0 0
cgroup /sys/fs/cgroup/net_cls,net_prio cgroup rw,seclabel,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,seclabel,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,seclabel,nosuid,nodev,noexec,relatime,memory 0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,seclabel,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
cgroup /sys/fs/cgroup/rdma cgroup rw,seclabel,nosuid,nodev,noexec,relatime,rdma 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,seclabel,nosuid,nodev,noexec,relatime,cpuset 0 0
cgroup /sys/fs/cgroup/hugetlb cgroup rw,seclabel,nosuid,nodev,noexec,relatime,hugetlb 0 0
cgroup /sys/fs/cgroup/perf_event cgroup rw,seclabel,nosuid,nodev,noexec,relatime,perf_event 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,seclabel,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,seclabel,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/pids cgroup rw,seclabel,nosuid,nodev,noexec,relatime,pids 0 0
[root@localhost ~]# uname -a
Linux localhost.localdomain 4.18.0-305.el8.x86_64 #1 SMP Thu Apr 29 08:54:30 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost ~]# cat /etc/os-release
NAME="Red Hat Enterprise Linux"
VERSION="8.4 (Ootpa)"
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this is a cgroup v2 example.