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docker学习笔记2 -- 资源限制

压测工具stress:

  • 下载: 
    • http://people.seas.harvard.edu/~apw/stress/
  • 编译安装: 
    • 解压 & configure & make

测试CPU

宿主机:CPU 3CORE

场景一:不做限制

  1. 宿主机启动镜像,不指定绑定到哪个核

    docker run --rm -ti -v /tmp/stress/:/tmp centos7.2 /bin/bash

      

  2. 进入宿主机执行stress:

    /tmp/stress -c 3

      

3.观察宿主机CPU使用情况:

top:    top - 09:43:48 up 34 days, 28 min,  2 users,  load average: 2.74, 1.89, 1.02    Tasks: 208 total,   5 running, 203 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  :100.0 us,  0.0 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st    %Cpu2  :100.0 us,  0.0 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st    %Cpu3  :  2.0 us,  1.0 sy,  0.0 ni, 96.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.3 st 

  

观察到4个core中的3个core已经被占满了

 

场景二:测试--cpuset-cpus

  1. 宿主机启动镜像,通过--cpuset-cpus指定绑定到CPU1

    docker run --rm -ti -v /tmp/stress/:/tmp --cpuset-cpus=1 centos7.2 /bin/bash

      

  2. 进入宿主机执行stress:

    ./tmp/stress -c 3

      

3.观察宿主机CPU使用情况:

top - 09:45:04 up 34 days, 29 min,  2 users,  load average: 2.45, 2.02, 1.14Tasks: 207 total,   4 running, 203 sleeping,   0 stopped,   0 zombie%Cpu0  :  0.3 us,  0.3 sy,  0.0 ni, 99.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.3 st%Cpu1  :100.0 us,  0.0 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st%Cpu2  :  0.7 us,  0.3 sy,  0.0 ni, 98.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.3 st%Cpu3  :  0.7 us,  0.3 sy,  0.0 ni, 99.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

  

观察到只有core1被占满,其余CPU都出空闲状态

 

场景三:测试--cpu-shares

  1. 宿主机启动容器test1,通过--cpuset-cpus指定绑定到CPU1,--cpu-shares设置权重为1024

    docker run --rm -ti -v /tmp/stress/:/tmp --cpuset-cpus=1 --cpu-shares 1024 --name test1 centos7.2 /bin/bash/tmp/stress -c 1  # 启动后执行

      

  2. 宿主机启动容器test2,通过--cpuset-cpus指定绑定到CPU1,--cpu-shares设置权重为512

    docker run --rm -ti -v /tmp/stress/:/tmp --cpuset-cpus=1 --cpu-shares 512 --name test2 centos7.2 /bin/bash/tmp/stress -c 1  # 启动后执行

      

  3. 宿主机top查看CPU使用率

    13745 root      20   0    7256     92      0 R  66.7  0.0   0:40.38 stress              14117 root      20   0    7256     92      0 R  33.3  0.0   0:04.01 stress 

      

发现其中一个进程cpu占了三分之一,另一个占用三分之二

 

测试内存

宿主机内存16G

 

场景一 测试-m --memory

  1. 宿主机启动test1,通过-m绑定使用内存为100MBdocker run --rm -ti -v /tmp/stress/:/tmp --memory 100m --name test1 centos7.2 /bin/bashdocker容器使用stress测试内存[root@b02d3c4a5919 /]# /tmp/stress --vm 1 --vm-bytes 90M --vm-hang 0  stress: info: [18] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd^C[root@b02d3c4a5919 /]# /tmp/stress --vm 1 --vm-bytes 99M --vm-hang 0  stress: info: [20] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd^C[root@b02d3c4a5919 /]# /tmp/stress --vm 1 --vm-bytes 100M --vm-hang 0  stress: info: [22] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hddstress: FAIL: [22] (415) <-- worker 23 got signal 9stress: WARN: [22] (417) now reaping child worker processesstress: FAIL: [22] (451) failed run completed in 0s[root@b02d3c4a5919 /]# /tmp/stress --vm 1 --vm-bytes 110M --vm-hang 0 stress: info: [24] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hddstress: FAIL: [24] (415) <-- worker 25 got signal 9stress: WARN: [24] (417) now reaping child worker processesstress: FAIL: [24] (451) failed run completed in 0s

发现当容器内使用内存超过-m内存限制时直接被kill

 

场景二:测试--momory 和 --memory-swap

  1. 宿主机启动test1,通过-m绑定使用内存为100MB

    docker run --rm -ti -v /tmp/stress/:/tmp --memory 100m --memory-swap 150m --name test1 centos7.2 /bin/bash

      

  2. docker容器使用stress测试内存

    [root@b02d3c4a5919 /]# /tmp/stress --vm 1 --vm-bytes 90M --vm-hang 0  stress: info: [18] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd^C[root@b02d3c4a5919 /]# /tmp/stress --vm 1 --vm-bytes 99M --vm-hang 0  stress: info: [20] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd^C[root@b02d3c4a5919 /]# /tmp/stress --vm 1 --vm-bytes 100M --vm-hang 0  stress: info: [22] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hddstress: FAIL: [22] (415) <-- worker 23 got signal 9stress: WARN: [22] (417) now reaping child worker processesstress: FAIL: [22] (451) failed run completed in 0s[root@b02d3c4a5919 /]# /tmp/stress --vm 1 --vm-bytes 110M --vm-hang 0 stress: info: [24] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hddstress: FAIL: [24] (415) <-- worker 25 got signal 9stress: WARN: [24] (417) now reaping child worker processesstress: FAIL: [24] (451) failed run completed in 0s

      

docker学习笔记2 -- 资源限制