Shantanu's Blog

Corporate Consultant

February 19, 2016

 

docker tips

1) List all installed images:

# docker images
REPOSITORY              TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
redis                   latest              099f1d00ac84        2 days ago          151.3 MB
continuumio/miniconda   latest              7a285fa253c7        9 days ago          405.2 MB
jpetazzo/nsenter        latest              e8f4be644d49        5 months ago        368.3 MB

2) List active containers:
# docker ps
CONTAINER ID        IMAGE                   COMMAND                  CREATED             STATUS              PORTS                  NAMES
62a73bb80e54        redis                   "/entrypoint.sh redis"   10 minutes ago      Up 10 minutes       6379/tcp               myredis1
8c068c974e73        continuumio/miniconda   "/usr/bin/tini -- /bi"   49 minutes ago      Up 49 minutes       0.0.0.0:80->7778/tcp   small_leakey

3) List all containers:
# docker ps  -a
CONTAINER ID        IMAGE                   COMMAND                  CREATED             STATUS                      PORTS                  NAMES
62a73bb80e54        redis                   "/entrypoint.sh redis"   10 minutes ago      Up 10 minutes               6379/tcp               myredis1
55a56eece76e        jpetazzo/nsenter        "/bin/sh -c /installe"   19 minutes ago      Exited (0) 19 minutes ago                          jolly_albattani
8c068c974e73        continuumio/miniconda   "/usr/bin/tini -- /bi"   49 minutes ago      Up 49 minutes               0.0.0.0:80->7778/tcp   small_leakey
d46a8bc2239e        redis                   "/entrypoint.sh redis"   51 minutes ago      Exited (0) 11 minutes ago                          myredis

4) Start a container based on available image:
# docker start 55a56eece76e

4) stop (or kill) and remove files of the working container. use -t 25 with sop command so that container will be forcefully killed after 25 seconds.
# docker stop 62a73bb80e54
62a73bb80e54

# docker rm 62a73bb80e54
62a73bb80e54

5) remove the container even if it is stopped so that we can remove the image in the next step
#docker rm d46a8bc2239e

6) remove the image completely
# docker rmi redis
Untagged: redis:latest
Deleted: 099f1d00ac840d7a0037c5f5232c37dfcc986805207ce73a965b75a23e2a4f82
Deleted: dd65623527ec836770b73863b9ca463d11e8979f787a4d0d96621e00794a9b98


7) Pause and unpause container:

# docker ps
CONTAINER ID        IMAGE                   COMMAND                  CREATED             STATUS              PORTS                  NAMES
8c068c974e73        continuumio/miniconda   "/usr/bin/tini -- /bi"   55 minutes ago      Up 55 minutes       0.0.0.0:80->7778/tcp   small_leakey

# docker pause 8c068c974e73
8c068c974e73

# docker ps
CONTAINER ID        IMAGE                   COMMAND                  CREATED             STATUS                   PORTS                  NAMES
8c068c974e73        continuumio/miniconda   "/usr/bin/tini -- /bi"   55 minutes ago      Up 55 minutes (Paused)   0.0.0.0:80->7778/tcp   small_leakey

docker unpause 8c068c974e73

8) Download an image

docker create -p 6379:6379 redis:2.8

docker ps -a
# to get the container ID

docker start 8c068c974e73

9) Download and start both steps merged together using run command:

docker run -v /myredis/conf/redis.conf:/usr/local/etc/redis/redis.conf --name myredis redis redis-server /usr/local/etc/redis/redis.conf

10)  stress test

docker run --rm -ti -c 512 --cpuset=0 progrium/stress --cpu 2 --io 1 --vm 2 --vm-bytes 128M --timeout 120s

Lower the allocated memory and increase used memory - recipe for crash:

docker run --rm -ti -m 200m --memory-swap=300m progrium/stress --cpu 2 --io 1 --vm 2 --vm-bytes 128M --timeout 120s

11) Copy a file from container to base machine

docker cp 8c068c974e73:/testdocker.ipynb .

12) Storage volumes:


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