docker资源限制

DOCKER 1.8.2

CPU的资源限制：

-c CPU权重
只有争用时权重才有意义
例如，启动两个容器，使用同一个cpu权重分别为1024和512

docker run -ti --rm -c 1024 --cpuset-cpus=0 centos
docker run -ti --rm -c 512 --cpuset-cpus=0 centos

分别执行：while true;do i=1;done 消耗CPU资源

[root@centos-1 ~]# top
top - 00:21:43 up 51 min,  3 users,  load average: 1.14, 0.67, 0.55
Tasks: 203 total,   4 running, 199 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,  0.3 sy,  0.0 ni, 99.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  :  0.0 us,  0.3 sy,  0.0 ni, 99.7 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 :  1013272 total,   661444 free,   133464 used,   218364 buff/cache
KiB Swap:  2097148 total,  2097148 free,        0 used.   719192 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                            
 3517 root      20   0   11772   1748   1404 R  66.8  0.2   0:22.34 bash                                                                                               
 3584 root      20   0   11772   1748   1404 R  33.2  0.2   0:30.42 bash     

结果如同权重设置一致：最大CPU消耗为1024:512=2:1

--cpuset-cpus=        CPUs in which to allow execution (0-3, 0,1)

#创建如下容器，仅使用0，1CPU资源：

docker run -ti --rm --cpuset-cpus=0,1 centos

耗尽资源：

[root@d7cf41bd1340 /]# ps -ef | grep test    
root        16     1 96 16:29 ?        00:01:18 sh test.sh
root        17     1 54 16:29 ?        00:00:32 sh test.sh
root        18     1 48 16:29 ?        00:00:24 sh test.sh
root        23     1 34 16:30 ?        00:00:01 sh test.sh
root        24     1 32 16:30 ?        00:00:01 sh test.sh
root        25     1 37 16:30 ?        00:00:01 sh test.sh

top - 00:31:47 up  1:01,  3 users,  load average: 4.97, 2.73, 1.55
Tasks: 208 total,   7 running, 201 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  :  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,  0.3 sy,  0.0 ni, 99.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  1013272 total,   651904 free,   138928 used,   222440 buff/cache
KiB Swap:  2097148 total,  2097148 free,        0 used.   713716 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                            
 3696 root      20   0   11632   1124    940 R  33.6  0.1   0:55.70 sh                                                                                                 
 3697 root      20   0   11632   1120    940 R  33.6  0.1   0:48.37 sh                                                                                                 
 3703 root      20   0   11632   1124    940 R  33.6  0.1   0:25.18 sh                                                                                                 
 3694 root      20   0   11632   1120    940 R  33.2  0.1   1:41.80 sh                                                                                                 
 3704 root      20   0   11632   1120    940 R  33.2  0.1   0:24.74 sh                                                                                                 
 3705 root      20   0   11632   1124    940 R  33.2  0.1   0:24.55 sh         

限制内存：
-m 内存限制
--memory-swap=                  Total memory (memory + swap), '-1' to disable swap 限制swap

#内存128m，swap 128m

docker run -ti --rm -m 128m --memory-swap=256m centos

由于懒，没测试