Whats is Docker ? Wikipedia says Docker is a computer program that performs operating-system-level virtualization, also known as “containerization”. first time released 2013 and is developed by Docker, Inc.
Docker is opensource project to automate deployment of applications using containers. the containers allow the developers to package the applications. its also designed to deliver the applications faster and with docker you can separate the application from the infrastructure and tread your infra like a managed application
i will try to explain in this tutorial : Install and configure Docker in Suse Entreprise and Openssuse 15
I- Update your System
sudo zypper up -y
II- Install Docker in Opensuse / Suse Entreprise
you don’t need any extra packages to install Docker , just with command install docker
sudo zypper in docker -y
osradar@linux-b7wo:~> sudo zypper in docker Building repository 'openSUSE-Leap-15.0-1' cache .................................................................................................................[ Building repository 'openSUSE-Leap-15.0-Non-Oss' cache ...........................................................................................................[ Building repository 'openSUSE-Leap-15.0-Update' cache ............................................................................................................[ Building repository 'openSUSE-Leap-15.0-Update-Non-Oss' cache ....................................................................................................[ Loading repository data... Reading installed packages... Resolving package dependencies... The following 17 NEW packages are going to be installed: catatonit containerd criu docker docker-bash-completion docker-libnetwork docker-runc git-core git-gui gitk libnet9 libpcre2-8-0 libprotobuf-c1 libsha1detectcoll perl-Error python2-ipaddr python2-protobuf
Enable and start Docker service:
systemctl enable docker systemctl start docker
How to user Docker
there is many command to use to manage you Dockers containers
Search Docker images
To find Dockers containers you can command search .  ( centos/wordpress/ubuntu or others.. )
sudo docker search centos
osradar@linux-b7wo:~> sudo docker search centos NAME DESCRIPTION STARS OFFICIAL AUTOMATED centos The official build of CentOS. 5102 [OK] ansible/centos7-ansible Ansible on Centos7 119 [OK] jdeathe/centos-ssh CentOS-6 6.10 x86_64 / CentOS-7 7.5.1804 x86… 105 [OK] consol/centos-xfce-vnc Centos container with "headless" VNC session… 75 [OK] imagine10255/centos6-lnmp-php56 centos6-lnmp-php56 48 [OK] centos/mysql-57-centos7 MySQL 5.7 SQL database server 45 tutum/centos Simple CentOS docker image with SSH access 43 openshift/base-centos7 A Centos7 derived base image for Source-To-I… 39 gluster/gluster-centos Official GlusterFS Image [ CentOS-7 + Glust… 38 [OK] centos/postgresql-96-centos7 PostgreSQL is an advanced Object-Relational … 36 centos/python-35-centos7 Platform for building and running Python 3.5… 33 kinogmt/centos-ssh CentOS with SSH 25 [OK] openshift/jenkins-2-centos7 A Centos7 based Jenkins v2.x image for use w… 20 centos/php-56-centos7 Platform for building and running PHP 5.6 ap… 18 pivotaldata/centos-gpdb-dev CentOS image for GPDB development. Tag names… 10 openshift/wildfly-101-centos7 A Centos7 based WildFly v10.1 image for use … 6 openshift/jenkins-1-centos7 DEPRECATED: A Centos7 based Jenkins v1.x ima… 4
Download latest Centos container
sudo docker pull centos
osradar@linux-b7wo:~> sudo docker pull centos Using default tag: latest latest: Pulling from library/centos a02a4930cb5d: Downloading [=============================================> ] 68.79MB/75.17MB
check if the images is correctly downloaded
sudo docker images osradar@linux-b7wo:~> sudo docker images REPOSITORY TAG IMAGE ID CREATED SIZE centos latest 1e1148e4cc2c 5 weeks ago 202MB osradar@linux-b7wo:~>
Lunch the container with the Centos image
osradar@linux-b7wo:~> sudo docker run -i -t centos /bin/bash [root@3b9d430166e8 /]# cat /etc/redhat-release CentOS Linux release 7.6.1810 (Core) [root@3b9d430166e8 /]#
to Exit and keep the container running, use the command CTRL +P + Q
List The containers with command docker ps
osradar@linux-b7wo:~> sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 81369fe86348 centos "/bin/bash" 2 minutes ago Up 2 minutes zealous_mayer
How to Start/Stop/ and Attach Container
You can start, stop or attach any container with following commands.
First List the containers
sudo docker ps
To start container use next command.
docker start <CONTAINER_ID>
To stop container do
docker stop <CONTAINER_ID>
To attach to currently running container do
docker attach <CONTAINER_ID>
example of attaching my Archlinux Contianer
osradar@linux-b7wo:~> sudo docker attach 15770de227ce [root@15770de227ce /]# uname -a Linux 15770de227ce 4.12.14-lp150.11-default #1 SMP Fri May 11 08:28:30 UTC 2018 (a9fee09) x86_64 GNU/Linux [root@15770de227ce /]#
