1、下载一个stress压力工具的镜像
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[root@docker ~]
# docker pull joedval/stress
Pulling repository joedval
/stress
7eb627cb08a2: Download complete
b0082ba983ef: Download complete
109b72e23ca5: Download complete
a1a076997d57: Download complete
Status: Downloaded newer image
for
joedval
/stress
:latest
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2、随机生成一个以“joedval/stress”镜像为基础的容器，设定权级为512
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[root@docker ~]
# docker run -it --rm -c 512 joedval/stress --cpu 1
stress: info: [1] dispatching hogs: 1 cpu, 0 io, 0 vm, 0 hdd
可以看到cpu占用为99.6%，接近100%
[root@docker ~]
# top
top
- 15:19:07 up 1:04, 3
users
, load average: 1.62, 1.03, 0.43
Tasks: 158 total, 2 running, 156 sleeping, 0 stopped, 0 zombie
Cpu(s): 99.3%us, 0.3%sy, 0.0%ni, 0.0%
id
, 0.0%wa, 0.3%hi, 0.0%si, 0.0%st
Mem: 3910160k total, 1289624k used, 2620536k
free
, 96856k buffers
Swap: 4194300k total, 0k used, 4194300k
free
, 914440k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4144 root 20 0 7208 120 28 R 99.6 0.0 2:58.09 stress
4403 root 20 0 15032 1252 924 R 0.3 0.0 0:00.32
top
1 root 20 0 19356 1532 1228 S 0.0 0.0 0:01.55 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration
/0
4 root 20 0 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd
/0
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 stopper
/0
6 root RT 0 0 0 0 S 0.0 0.0 0:00.02 watchdog
/0
7 root 20 0 0 0 0 S 0.0 0.0 0:01.62 events
/0
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 events
/0
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 events_long
/0
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 events_power_ef
11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cgroup
12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 khelper
13 root 20 0 0 0 0 S 0.0 0.0 0:00.03 netns
14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 async
/mgr
15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pm
16 root 20 0 0 0 0 S 0.0 0.0 0:00.02 sync_supers
17 root 20 0 0 0 0 S 0.0 0.0 0:00.01 bdi-default
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3、继续生成一个容器
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root@docker ~]
# docker run -it --rm -c 512 joedval/stress --cpu 1
stress: info: [1] dispatching hogs: 1 cpu, 0 io, 0 vm, 0 hdd
[root@docker ~]
# top
top
- 15:20:48 up 1:05, 3
users
, load average: 1.55, 1.13, 0.52
Tasks: 164 total, 3 running, 161 sleeping, 0 stopped, 0 zombie
Cpu(s): 99.0%us, 0.7%sy, 0.0%ni, 0.0%
id
, 0.0%wa, 0.3%hi, 0.0%si, 0.0%st
Mem: 3910160k total, 1298324k used, 2611836k
free
, 97924k buffers
Swap: 4194300k total, 0k used, 4194300k
free
, 917480k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4772 root 20 0 7208 124 28 R 49.9 0.0 0:16.12 stress
4144 root 20 0 7208 120 28 R 49.5 0.0 4:22.39 stress
1 root 20 0 19356 1532 1228 S 0.0 0.0 0:01.55 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration
/0
4 root 20 0 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd
/0
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 stopper
/0
6 root RT 0 0 0 0 S 0.0 0.0 0:00.02 watchdog
/0
7 root 20 0 0 0 0 S 0.0 0.0 0:01.66 events
/0
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 events
/0
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 events_long
/0
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 events_power_ef
11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cgroup
12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 khelper
13 root 20 0 0 0 0 S 0.0 0.0 0:00.03 netns
14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 async
/mgr
15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pm
16 root 20 0 0 0 0 S 0.0 0.0 0:00.02 sync_supers
17 root 20 0 0 0 0 S 0.0 0.0 0:00.01 bdi-default
然后，可以发现存在两个stress的进程，各占用49.5%
我们再次添加一个容器，并修改下stress权限为1024
[root@docker ~]
# top
top
- 15:22:13 up 1:07, 4
users
, load average: 2.53, 1.50, 0.70
Tasks: 171 total, 4 running, 167 sleeping, 0 stopped, 0 zombie
Cpu(s): 99.3%us, 0.3%sy, 0.0%ni, 0.0%
id
, 0.0%wa, 0.3%hi, 0.0%si, 0.0%st
Mem: 3910160k total, 1318152k used, 2592008k
free
, 99008k buffers
Swap: 4194300k total, 0k used, 4194300k
free
, 921024k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4992 root 20 0 7208 120 28 R 49.5 0.0 0:09.79 stress
4144 root 20 0 7208 120 28 R 24.9 0.0 4:59.56 stress
4772 root 20 0 7208 124 28 R 24.6 0.0 0:53.28 stress
1 root 20 0 19356 1532 1228 S 0.0 0.0 0:01.55 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
3 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration
/0
4 root 20 0 0 0 0 S 0.0 0.0 0:00.03 ksoftirqd
/0
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 stopper
/0
6 root RT 0 0 0 0 S 0.0 0.0 0:00.02 watchdog
/0
7 root 20 0 0 0 0 S 0.0 0.0 0:01.69 events
/0
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 events
/0
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 events_long
/0
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 events_power_ef
11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cgroup
12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 khelper
13 root 20 0 0 0 0 S 0.0 0.0 0:00.03 netns
14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 async
/mgr
15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pm
16 root 20 0 0 0 0 S 0.0 0.0 0:00.02 sync_supers
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4、查看容器信息：
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[root@docker ~]
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
fcc6cb7b064c joedval
/stress
"stress --cpu 1"
29 seconds ago Up 28 seconds drunk_rosalind
7c195fe2e038 joedval
/stress
"stress --cpu 1"
2 minutes ago Up 2 minutes loving_galileo
9b19fbca489b joedval
/stress
"stress --cpu 1"
7 minutes ago Up 7 minutes furious_rosalind
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5、测试内存：
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[root@docker ~]
# docker run -it --rm -m 128m joedval/stress --vm 1 --vm-bytes 120m --vm-hang 0
stress: info: [1] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd
[root@docker ~]
# docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
9841ee711d7f joedval
/stress
"stress --vm 1 --vm- 8 seconds ago Up 6 seconds boring_jones
[root@docker ~]
# docker run -it --rm -m 128m joedval/stress --vm 1 --vm-bytes 512m --vm-hang 0
stress: info: [1] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd
stress: FAIL: [1] (415) <-- worker 5 got signal 9
stress: WARN: [1] (417) now reaping child worker processes
stress: FAIL: [1] (421)
kill
error: No such process
stress: FAIL: [1] (451) failed run completed
in
3s
[root@docker ~]
# docker run -it --rm -m 128m joedval/stress --vm 1 --vm-bytes 255m --vm-hang 0
stress: info: [1] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd
[root@docker ~]
# docker run -it --rm -m 128m joedval/stress --vm 1 --vm-bytes 256m --vm-hang 0
stress: info: [1] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd
stress: FAIL: [1] (415) <-- worker 6 got signal 9
stress: WARN: [1] (417) now reaping child worker processes
stress: FAIL: [1] (421)
kill
error: No such process
stress: FAIL: [1] (451) failed run completed
in
2s
说明：不能超过预设值的两倍(比如上面案例中256m是128m，所以自动退出了）
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本文转自 冰冻vs西瓜 51CTO博客，原文链接：http://blog.51cto.com/molewan/1757918，如需转载请自行联系原作者
