https://www.cyberciti.biz/faq/install-use-setup-docker-on-rhel7-centos7-linux
How
do I install and setup Docker container on an RHEL 7 (Red Hat
Enterprise Linux) server? How can I setup Docker on a CentOS 7? How to
install and use Docker CE on a CentOS Linux 7 server?
Docker is free and open-source software. It automates the deployment of any application as a lightweight, portable, self-sufficient container that will run virtually anywhere. Typically you develop software on your laptop/desktop. You can build a container with your app, and it can test run on your computer. It will scale in cloud, VM, VPS, bare-metal and more. There are two versions of docker. The first one bundled with RHEL/CentOS 7 distro and can be installed with the yum. The second version distributed by the Docker project called docker-ce (community free version) and can be installed by the official Docker project repo. The third version distributed by the Docker project called docker-ee (Enterprise paid version) and can be installed by the official Docker project repo. This page shows how to install, setup and use Docker or Docker CE on RHEL 7 or CentOS 7 server and create your first container.
Next install needed packages:
Configure the docker-ce repo:
Finally install docker-ce:
Sample outputs:
Sample outputs:
Sample outputs:
Sample outputs:
Run 'docker COMMAND --help' for more information on a command:
Sample outputs:
Sample outputs:
Sample outputs:
Say you want to host simple static file hosted in /home/vivek/html/ using nginx container:
Where,
Test it:
Sample outputs:
Sample outputs:
You can use CONTAINER ID to stop, pause or login into the container.
OR
Want to gain bash shell for a running container and make changes to nginx image?
OR
OR
And there you have it, Docker installed and running on a CentOS 7 or RHEL 7 server. For more info see the following resources:
Docker is free and open-source software. It automates the deployment of any application as a lightweight, portable, self-sufficient container that will run virtually anywhere. Typically you develop software on your laptop/desktop. You can build a container with your app, and it can test run on your computer. It will scale in cloud, VM, VPS, bare-metal and more. There are two versions of docker. The first one bundled with RHEL/CentOS 7 distro and can be installed with the yum. The second version distributed by the Docker project called docker-ce (community free version) and can be installed by the official Docker project repo. The third version distributed by the Docker project called docker-ee (Enterprise paid version) and can be installed by the official Docker project repo. This page shows how to install, setup and use Docker or Docker CE on RHEL 7 or CentOS 7 server and create your first container.
How to install and use Docker on RHEL 7 or CentOS 7 (method 1)
The procedure to install Docker is as follows:- Open the terminal application or login to the remote box using ssh command:
ssh user@remote-server-name - Type the following command to install Docker via yum provided by Red Hat:
sudo yum install docker - Type the following command to install the latest version of Docker CE (community edition):
sudo yum remove docker docker-common docker-selinux docker-engine
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker-ce
How to install Docker on CentOS 7 / RHEL 7 using yum
Type the following yum command:$ sudo yum install docker
How to install Docker CE on CentOS 7 (method 2)
First remove older version of docker (if any):$ sudo yum remove docker docker-common docker-selinux docker-engine-selinux docker-engine docker-ce
Next install needed packages:
$ sudo yum install -y yum-utils device-mapper-persistent-data lvm2
Configure the docker-ce repo:
$ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Loaded plugins: fastestmirror adding repo from: https://download.docker.com/linux/centos/docker-ce.repo grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo repo saved to /etc/yum.repos.d/docker-ce.repo |
$ sudo yum install docker-ce
How to enable docker service
$ sudo systemctl enable docker.service
Sample outputs:
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
How to start/stop/restart docker service on CentOS7/RHEL7
$ sudo systemctl start docker.service ## <-- docker="" kbd="" start=""> ##
$ sudo systemctl stop docker.service ## <-- docker="" kbd="" stop=""> ##
$ sudo systemctl restart docker.service ## <-- docker="" kbd="" restart=""> ##
$ sudo systemctl status docker.service ## <-- docker="" get="" kbd="" of="" status=""> ##-->-->-->-->
Sample outputs:
How to find out info about Docker network bridge and IP addresses
Default network bridge named as docker0 and is assigned with an IP address. To find this info run the following ip command:$ ip a
$ ip a list docker0
Sample outputs:
3: docker0: |
How to run docker commands
The syntax is:docker command
docker command arg
docker [options] command arg
docker help | more
Get system-wide information about Docker
docker info
Getting help
docker help | more
Sample outputs:
Run 'docker COMMAND --help' for more information on a command:
docker ps --help
docker cp --help
How to test your docker installation
Docker images are pulled from docker cloud/hub such as docker.io or registry.access.redhat.com and so on. Type the following command to verify that your installation working:docker run hello-world
Sample outputs:
How to search for Docker images
Now you have working Docker setup. It is time to find out images. You can find images for all sort of open source projects and Linux distributions. To search the Docker Hub/cloud for nginx image run:docker search nginx
Sample outputs:
How to install Docker nginx image
To pull an image named nginx from a registry, run:docker pull nginx
Sample outputs:
How to run Docker nginx image
Now you pulled image, it is time to run it:docker run --name my-nginx-c1 --detach nginx
Say you want to host simple static file hosted in /home/vivek/html/ using nginx container:
docker run --name my-nginx-c2 -p 80:80 -v /home/vivek/html/:/usr/share/nginx/html:ro -d nginx
Where,
- --name my-nginx-c1 : Assign a name to the container
- --detach : Run container in background and print container ID
- -v /home/vivek/html/:/usr/share/nginx/html:ro : Bind mount a volume
- -p 80:80 : Publish a container's port(s) to the host i.e redirect all traffic coming to port 80 to container traffic
echo 'Welcome. I am Nginx server locked inside Docker' > /home/vivek/html/index.html
Test it:
curl http://your-host-ip-address/
curl 192.168.122.188
Sample outputs:
Welcome. I am Nginx server locked inside Docker
How to list running Docker containers
docker ps
docker ps -a
Sample outputs:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES bb9d85a56a92 nginx "nginx -g 'daemon of…" 55 seconds ago Up 54 seconds 0.0.0.0:80->80/tcp my-nginx-c2 fe0cdbc0225a nginx "nginx -g 'daemon of…" About a minute ago Up About a minute 80/tcp my-nginx-c1 |
How to run a command in a running container
Run ls /etc/nginx command for my-nginx-c1 containerdocker exec fe0cdbc0225a ls /etc/nginx
OR
docker exec my-nginx-c1 ls /etc/nginx
Want to gain bash shell for a running container and make changes to nginx image?
docker exec -i -t fe0cdbc0225a bash
OR
docker exec -i -t my-nginx-c1 bash
How to stop running containers
docker stop my-nginx-c1
OR
docker stopfe0cdbc0225a
How to remove docker containers
docker rm my-nginx-c1
docker ps -a
And there you have it, Docker installed and running on a CentOS 7 or RHEL 7 server. For more info see the following resources:
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