通常情况运行docker容器没有指定具体哪个cpu和内存的分配，其实docker官方给出了，docker容器可以运行在指定CPU上通过docker run --help可以看到:
先制作docker镜像:
编写Dockerfile
[root@linux-node1 ~]# cd stress/ [root@linux-node1 stress]# cat Dockerfile FROM centos ADD epel-6.repo /etc/yum.repos.d/ RUN yum -y install stress && yum clean all ENTRYPOINT ["stress"] [root@linux-node1 stress]# [root@linux-node1 stress]# docker build -t stress . Sending build context to Docker daemon 4.096 kB Step 1 : FROM centos ---> 970633036444 Step 2 : ADD epel-6.repo /etc/yum.repos.d/ ---> 77600d6b488e Removing intermediate container f141f47cb34f Step 3 : RUN yum -y install stress && yum clean all ---> Running in 0949035c73da Loaded plugins: fastestmirror, ovl http://mirrors.aliyuncs.com/epel/6/x86_64/repodata/98697cba0d79c083725de0c38b11c15878b35f5e27262becc02cd7ed1a13ac22-updateinfo.xml.bz2: [Errno 12] Timeout on http://mirrors.aliyuncs.com/epel/6/x86_64/repodata/98697cba0d79c083725de0c38b11c15878b35f5e27262becc02cd7ed1a13ac22-updateinfo.xml.bz2: (28, ‘Connection timed out after 30001 milliseconds‘) Trying other mirror. Determining fastest mirrors * base: mirrors.zju.edu.cn * epel: mirrors.aliyun.com * extras: mirrors.zju.edu.cn * updates: mirrors.cqu.edu.cn Resolving Dependencies --> Running transaction check ---> Package stress.x86_64 0:1.0.4-4.el6 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: stress x86_64 1.0.4-4.el6 epel 36 k Transaction Summary ================================================================================ Install 1 Package Total download size: 36 k Installed size: 89 k Downloading packages: Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : stress-1.0.4-4.el6.x86_64 1/1 install-info: No such file or directory for /usr/share/info/stress.info Verifying : stress-1.0.4-4.el6.x86_64 1/1 Installed: stress.x86_64 0:1.0.4-4.el6 Complete! Loaded plugins: fastestmirror, ovl Cleaning repos: base epel extras updates Cleaning up everything Cleaning up list of fastest mirrors ---> 504c747b9b51 Removing intermediate container 0949035c73da Step 4 : ENTRYPOINT stress ---> Running in ea8d8eb8fb87 ---> 7e1e0e5cf825 Removing intermediate container ea8d8eb8fb87 Successfully built 7e1e0e5cf825 [root@linux-node1 stress]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE stress latest 7e1e0e5cf825 About a minute ago 214 MB ningx-file v01 460b5af495c4 3 days ago 531.9 MB nginx/ningx 1.9.3v02 097c98e3cb2b 3 days ago 534.6 MB nginx 1.9.3 d2cfb9ed3f2b 3 days ago 534.6 MB docker.io/centos latest 970633036444 11 days ago 196.7 MB [root@linux-node1 stress]#
查看docker run命令帮助输出:
[root@linux-node1 stress]# docker run --help|grep cpu --cpu-shares CPU shares (relative weight) --cpu-period Limit CPU CFS (Completely Fair Scheduler) period --cpu-quota Limit CPU CFS (Completely Fair Scheduler) quota --cpuset-cpus CPUs in which to allow execution (0-3, 0,1) --cpuset-mems MEMs in which to allow execution (0-3, 0,1) [root@linux-node1 stress]#
启动一个容器:
[root@linux-node1 stress]# docker run -it --rm --cpuset-cpus=0 stress --cpu 1 stress: info: [1] dispatching hogs: 1 cpu, 0 io, 0 vm, 0 hdd
在另外一个窗口查看使用情况cpu:
[root@linux-node1 ~]# top top - 00:55:15 up 13:39, 2 users, load average: 0.58, 0.47, 0.69 Tasks: 406 total, 2 running, 404 sleeping, 0 stopped, 0 zombie %Cpu0 :100.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu1 : 0.3 us, 0.3 sy, 0.0 ni, 99.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu2 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 773004 total, 204488 free, 194528 used, 373988 buff/cache KiB Swap: 2098172 total, 2096324 free, 1848 used. 399644 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 5944 root 20 0 7260 92 0 R 100.0 0.0 0:52.46 stress 335 root 20 0 0 0 0 S 0.3 0.0 1:17.95 kworker/3:1 1569 root 20 0 553044 13624 2952 S 0.3 1.8 0:13.46 tuned 4779 root 20 0 0 0 0 S 0.3 0.0 0:02.25 kworker/1:1 5946 root 20 0 157948 2504 1548 R 0.3 0.3 0:00.18 top
同样，再开启一个窗口:
[root@linux-node1 stress]# docker run -it --rm stress --cpu 1 stress: info: [1] dispatching hogs: 1 cpu, 0 io, 0 vm, 0 hdd
再查切换到其他窗口查看cpu使用情况
[root@linux-node1 ~]# top top - 00:57:52 up 13:41, 3 users, load average: 1.50, 0.96, 0.84 Tasks: 414 total, 2 running, 412 sleeping, 0 stopped, 0 zombie %Cpu0 :100.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu1 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu2 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu3 : 0.0 us, 2.7 sy, 0.0 ni, 97.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 773004 total, 195560 free, 199560 used, 377884 buff/cache KiB Swap: 2098172 total, 2096576 free, 1596 used. 393660 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
注意命令:
docker run -it --rm stress --cpu 1
docker run -it --rm --cpuset-cpus=0 stress --cpu 1
--cpuset-cpus后面跟cpu总个数，为docker容器指定的，而--cpu是用多少个cpu来运行，只能是1、2、3、4 ...N等等
本文出自 “平平淡淡才是真” 博客，请务必保留此出处http://ucode.blog.51cto.com/10837891/1836484
原文地址：http://ucode.blog.51cto.com/10837891/1836484
