命名空间
六种 namespace
资源配额[cgroups]
mount -t cgroup
cd /sys/fs/cgroup/
cd memory/
默认是没有限制
现在更改内存使用
free -m
mount -t cgroup
bc
1024*200*1024 算出200M
mkdir x1
cd x1
echo 209715200 > memory.limit_in_bytes
cat tasks 写入需要控制的pid
cd /dev/shm
dd if=/dev/zero of=bigfile bs=1M count=100
这里使用内存就会减少100M
这样不会和其他进程共享内存
yum install -y libcgroup
yum search cgroup
cgexec -g memory:x1 dd of=/dev/zero of=bigfile bs=1M count=1--
采用memory中x1子控制器
rm -fr bigfile 取消控制
表示超出限制就不会生成
cgroup
mount -t cgroup
[root@foundation11 ~]# mount -c cgroup
mount: cgroup is already mounted or /sys/fs/cgroup/memory busy
cgroup is already mounted on /sys/fs/cgroup/systemd
cgroup is already mounted on /sys/fs/cgroup/blkio
cgroup is already mounted on /sys/fs/cgroup/net_cls,net_prio
cgroup is already mounted on /sys/fs/cgroup/perf_event
cgroup is already mounted on /sys/fs/cgroup/cpuset
cgroup is already mounted on /sys/fs/cgroup/hugetlb
cgroup is already mounted on /sys/fs/cgroup/cpu,cpuacct
cgroup is already mounted on /sys/fs/cgroup/devices
cgroup is already mounted on /sys/fs/cgroup/pids
cgroup is already mounted on /sys/fs/cgroup/freezer
cgroup is already mounted on /sys/fs/cgroup/memory
[root@foundation11 ~]# mount -t cgroup
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_prio,net_cls)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cd /sys/fs/cgroup/cpu
mkdir x1
cd x1
[root@foundation11 cpu]# cd x1/
[root@foundation11 x1]# ls
cgroup.clone_children cpu.cfs_quota_us
cgroup.event_control cpu.rt_period_us
cgroup.procs cpu.rt_runtime_us
cpuacct.stat cpu.shares
cpuacct.usage cpu.stat
cpuacct.usage_percpu notify_on_release
cpu.cfs_period_us tasks
在一个周期里面
dd if=/dev/zero of=/dev/null &
top ;按1 查看cpu
找到pid
echo 
> tasks
[root@foundation11 x1]# ls
cgroup.clone_children cpuacct.stat cpu.cfs_period_us cpu.rt_runtime_us notify_on_release
cgroup.event_control cpuacct.usage cpu.cfs_quota_us cpu.shares tasks
cgroup.procs cpuacct.usage_percpu cpu.rt_period_us cpu.stat
[root@foundation11 x1]# pwd
/sys/fs/cgroup/cpu/x1
就可以限制cpu
docker run --it --name vm1 --cpu-quota=50000 ubuntu
[root@foundation11 ~]# docker run -it --name vm1 --cpu-quota=50000 ubuntu
root@5973b076bd53:/# dd if=/dev/zero of=/dev/null
44089023+0 records out
22573579776 bytes (23 GB) copied, 65.2087 s, 346 MB/s
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6496 root 20 0 4368 360 280 R 50.0 0.0 0:05.54 dd
控制写入速度
docker run -it --rm --privileged=true ubuntu 超户登入
fdisk -l
cat /proc/partitions
docker run -it --rm --device-write-bps /dev/sda:30MB ubuntu
dd if=/dev/zero of=file bs=1M count=300 oflag=direct
仅支持直连IO 不过文件系统缓存
[root@foundation11 ~]# docker run -it --rm --device-write-bps /dev/sda:30MB ubuntu
root@9a511e976eb3:/# dd if=/dev/zero of=file bs=1M count=300 oflag=direct
300+0 records in
300+0 records out
314572800 bytes (315 MB) copied, 9.92418 s, 31.7 MB/s
/sys/fs/cgroup/freezer/docker
docker pause/unpause 也是对cgoup进行操作
安装lxcfs
yum install lxcfs-2.0.5-3.el7.centos.x86_64.rpm -y
lxcfs /var/lib/lxcfs/ &
出现问题
fuse: mountpoint is not empty
删掉原有文件/var/lib/lxcfs/ lxcfs /var/lib/lxcfs/ &
docker run -it --name vm1 -m 200m -v /var/lib/lxcfs/proc/cpuinfo:/proc/cpuinfo -v /var/lib/lxcfs/proc/diskstats:/proc/diskstats -v /var/lib/lxcfs/proc/meminfo:/proc/meminfo -v /var/lib/lxcfs/proc/stat:/proc/stat -v /var/lib/lxcfs/proc/swaps:/proc/swaps -v /var/lib/lxcfs/proc/uptime:/proc/uptime ubuntu
free -m
root@bac00272ffe3:/# free -m
total used free shared buffers cached
Mem: 200 2 197 299 0 0
-/+ buffers/cache: 2 197
Swap: 200 0 200
