Docker: Using Docker

This guide assumes docker is installed and the service is running;

Version etc

# For system-wide information on docker:
sudo docker info

# For docker version:
sudo docker version

Search for Docker images

docker search centos

Pulling down a Docker Image

[root@blade02 ~]# docker pull centos
latest: Pulling from centos
47d44cb6f252: Pull complete 
838c1c5c4f83: Pull complete 
5764f0a31317: Pull complete 
60e65a8e4030: Pull complete 
centos:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.
Digest: sha256:8072bc7c66c3d5b633c3fddfc2bf12d5b4c2623f7004d9eed6aae70e0e99fbd7
Status: Downloaded newer image for centos:latest

# OR 
docker pull ubuntu

Show Images locally installed

[root@blade02 ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
centos              latest              60e65a8e4030        7 weeks ago         196.6 MB

Run a Docker Container

docker run -i -t centos /bin/bash

Check Docker Processes Running (on Server)

[root@blade02 ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
540a25cda4af        centos              "/bin/bash"         11 seconds ago      Up 9 seconds                            compassionate_pike   
8f88fb204119        ubuntu              "/bin/bash"         8 minutes ago       Up 8 minutes                            sick_lalande  

# and to show non-running containers 
docker ps -l

Stop and Remove a Container

# get the container ID; 
[root@blade02 ~]# docker ps -l 
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS              PORTS               NAMES
540a25cda4af        centos              "/bin/bash"         About a minute ago   Up About a minute                       compassionate_pike   
[root@blade02 ~]# docker stop 540a25cda4af
540a25cda4af
[root@blade02 ~]# docker rm 540a25cda4af
540a25cda4af