Memory Docker容器的使用

Question

I am using Docker to run some containerized apps. I am interested in measuring how much resources they consume (as far as regarding CPU and Memory usage).

Is there any way to measure the resources consumed by Docker containers like RAM & CPU usage?

Thank you.

Answer 1

You can get this from docker stats eg:

$ docker stats --no-stream
CONTAINER           CPU %               MEM USAGE / LIMIT   MEM %               NET I/O             BLOCK I/O             PIDS
6b5c0fcfa7d4        0.13%               2.203 MiB / 4 MiB   55.08%              5.223 kB / 648 B    102.4 kB / 876.5 kB   3

Answer 2

Update: See @Adrian Mouat's answer below as docker now supports docker stats !

There isn't a way to do this that's built into docker in the current version. Future versions will support this via an api or plugin.

• https://github.com/dotcloud/docker/issues/36

It does look like there's an lxc project that you should be able to use to track CPU and Memory.

• https://github.com/Soulou/acadock-live-lxc

Answer 3

Also, you can read resource metrics directly from cgroups. See example below (I am running on Debian Jessie and docker 1.2 )

> docker ps -q
afa03c363af5
> ls /sys/fs/cgroup/memory/system.slice/ | grep docker-afa03c363af5
docker-afa03c363af54815d721d938e01fe4cb2debc4f6c15ebff1851e20f6cde3ae0e.scope
> cd docker-afa03c363af54815d721d938e01fe4cb2debc4f6c15ebff1851e20f6cde3ae0e.scope
> cat memory.usage_in_bytes
4358144
> cat memory.limit_in_bytes
1073741824

Answer 4

Kindly check out below commands for getting CPU and Memory usages of docker containers:-

docker status container_ID #to check single container resources

for i in $(docker ps -q); do docker stats $i --no-trunc --no-stream; echo "--------";done for i in $(docker ps -q); do docker stats $i --no-trunc --no-stream; echo "--------";done #to check/list all container resources

docker stats --all #to check all container resources live

docker system df -v #to check storage related information

Answer 5

• Memory usage of docker containers

  docker system df -v

• local docker space

  df -kh