I am covering some of the basics here. More details can be found in the free sample of my Docker Cookbook
Basics
Containers Vs VMs
Underlying Kernel Features and Execution Driver
Namespaces
pidnetipcmntutsuser
CGroups
For resource limitations and accounting for container SELinux/AppArmor
Union File-System
AUFSbtrfsvfsDevice Mapper
Docker Architecture
Basic Container Operations
- Make sure you have setup ready, as mentioned in earlier section
$ vagrant up
$ vagrant ssh labvm-1
$ sudo -s
- Start the container
docker run -it --name centos1 centos bash
docker run -it --rm --name centos2 centos bash
- Start the the container in background
docker run -d --name centos2 centos /bin/bash -c "while [ 1 ] ; do echo LinuxConEU2015 ; sleep 1; done"
- Looking at the logs of container
docker logs centos2
- Listing containers
docker ps
docker ps -a
docker ps -a -q
- Stopping a container
docker stop centos2
- Stopping all containers
docker stop `docker ps -a -q`
- Deleting a container
docker rm centos2
- Deleting all containers
docker rm -f `docker ps -a -q`
- Injecting new process inside a running container
docker run -d --name centos3 centos /bin/bash -c "while [ 1 ] ; do echo LinuxConEU2015 ; sleep 1; done"
docker exec -it centos3 bash
$ ps aux
- Inspecting a container
docker inspect centos3
Basic Image Operation
- Pulling an image
docker images
docker search fedora
docker pull <image>
- Creating an image from container
docker run -idt --name busyboxC busybox /bin/sh
docker commit -a "Neependra" -m "busybox updated" busyboxC linuxcon/mybusybox
- Exporting an image
docker save -o mybusybox.tar linuxcon/mybusybox
- Deleting an image
docker rmi linuxcon/mybusybox
- importing an image
cat mybusybox.tar | docker import - linuxconeu/mybusybox
- Building image from Dockerfile
echo i “FROM docker.io/centos” > Dockerfle
echo “RUN date > ~/date” >> Dockerfile
cat Dockerfile | docker build -t centoswithdate1 -
docker images
More details about Dockerfiles can be found on Docker Website