lab1.md

Lab 1: Intro to Docker

Prerequisite

Docker installed
docker-machine installed (Mac/Win)
Good internet connection

docker in interactive mode

Running docker in interactive mode allows a developer to:

• understand the environment
• debug when things go wrong
• research

We will be working with 2 images for these labs. ubuntu and kensipe/tomcat. The first time they are reference it will take several minutes as these images are pulled for the public repository. After that command-line references will run very quickly. It may be best to pull these images prior to starting the lab. To pull run: docker pull ubuntu and docker pull kensipe/tomcat.

If you haven't yet, start the docker-machine: docker-machine start and set the environment eval $(docker-machine env).

1. enter interactive mode:

   docker run -it ubuntu /bin/bash` or `docker run -it ubuntu
   

2. add a text file named owner.txt with your name in it.

   echo "ken sipe" > owner.txt
   

3. exit the container type: ctrl+p, ctrl+q

4. list the running dockers

   docker ps
   

NOTE: Experiment with variations here. docker ps -a, docker ps -l, docker ps -q, docker ps -lq

NOTE: It is common to set an alias for dl (docker last): alias dl='docker ps -lq'

5. diff on the container ID (SHA)

   docker diff $(docker ps -lq)
   or
   docker diff `dl`
   

6. attach to the container

   docker attach `dl`
   

7. exit the container. type: exit

8. commit your container

   docker commit `dl` owner
   

9. display owner information from your container in non-interactive mode

   docker run owner cat owner.txt
   

Installing commands

1. enter interactive mode

docker run -it ubuntu

2. install figlet

apt-get update && apt-get install figlet

3. commit image

docker commit `dl` figlet

4. run container

docker run figlet figlet hello

FINISHED