基于centos 创建一个stress镜像

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最近需要学习docker的Cgroups机制，需要用到stress进行测试，前期工作就是自己创建一个stress镜像。

1. 新建一个 Dockerfile 文件

   [vagrant@localhost ~]$ mkdir -p /tmp/stress
   [vagrant@localhost stress]$ sudo vi Dockerfile
   FROM library/centosADD epel-7.repo /etc/yum.repos.d/
   RUN yum clean all && yum makecache
   RUN yum install -y stress
   #CMD与ENTRYPOINT的区别在于执行docker run时参数传递的方式不同
   ENTRYPOINT ["stress", "--verbose"]

2. 构建镜像

   [vagrant@localhost stress]$ docker build -t centos-stress:1.0.1 .

3. 查看镜像是否生成

   [vagrant@localhost stress]$ docker images
   REPOSITORY TAG IMAGE ID CREATED SIZE
   centos-stress 1.0.1 3dd149b42c38 25 minutes ago 713MB

4. 测试改镜像成功

   [vagrant@localhost cgroup]$ docker run -ti --rm -m 200M --memory-swap=300M centos-stress:1.0.1 --vm 1 --vm-bytes 280M
   stress: info: [1] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd
   stress: dbug: [1] using backoff sleep of 3000us
   stress: dbug: [1] --> hogvm worker 1 [5] forked
   stress: dbug: [5] allocating 293601280 bytes ...
   stress: dbug: [5] touching bytes in strides of 4096 bytes ...
   stress: dbug: [5] freed 293601280 bytes
   stress: dbug: [5] allocating 293601280 bytes ...
   stress: dbug: [5] touching bytes in strides of 4096 bytes ...