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Introduction to Docker

Posted by Kylin Soong on Nov 6, 2015 categorized as docker

The commands come from Self-Paced Online Learning in https://training.docker.com/self-paced-training.

Add a user to docker group:

# sudo usermod -aG docker kylin

Docker version

# docker version

Dispaly images

# docker images

Creating a Container

# docker run ubuntu:14.04 echo "hello world"

# docker run ubuntu:14.04 ps -aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  3.0  0.0  15560   984 ?        Rs   09:49   0:00 ps -aux

Run a container and get Terminal Access

$ docker run -i -t ubuntu:14.04 /bin/bash
root@3e74dd26251f:/# adduser ksoong
root@3e74dd26251f:/# adduser ksoong sudo
$ docker run -i -t ubuntu:14.04 /bin/bash

Docker container ID

$ docker ps
$ docker ps -a

Run container in detached mode:

$ docker run -d ubuntu ping 127.0.0.1 -c 100
$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
70cde9a3a22b        ubuntu              "ping 127.0.0.1 -c 10"   13 seconds ago      Up 12 seconds                           pensive_babbage
$ docker logs 70cde9a3a22b

Tomcat container

$ docker run -d -P tomcat:7
$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                     NAMES
18bd96a1996c        tomcat:7            "catalina.sh run"   3 minutes ago       Up 3 minutes        0.0.0.0:32768->8080/tcp   sad_torvalds

127.0.0.1:32768