Install Docker

Remove older version of docker if any:

Ubuntu:

   sudo apt-get remove docker docker-engine docker.io containerd runc

CentOS:

   sudo yum remove docker \
                     docker-client \
                     docker-client-latest \
                     docker-common \
                     docker-latest \
                     docker-latest-logrotate \
                     docker-logrotate \
                     docker-engine

Update Packages:

Ubuntu:
1. ```
   sudo apt-get update
```
CentOS:
1. ```
   sudo yum install -y yum-utils
```

Install Docker:

Ubuntu:
1. ```
   sudo apt-get install docker.io
```
CentOS:
1. ```
   sudo yum install docker.io
```

Done. You have successfully installed Docker in your system!

Install Docker Compose

Ubuntu
1. ```
 sudo apt install docker-compose
```
CentOs:
1. ```
 sudo yum install docker-compose
```

Check versions

Docker
1. ```
 docker --version
```
docker-compose
1. ```
 docker-compose --version
```

Check the Status of the Docker

To check the status of the docker run systemctl or with service :
1. ```
   systemctl status docker
```
2. ```
   service docker stauts
```
  Active with green color shows that Docker is running.

Run Docker

Let's test Docker whether it runs or not.

First, start the docker with systemctl (may need for CentOS users):
1. ```
   sudo systemctl start docker
```
Run to test hello-world image:
1. ```
   sudo docker run hello-world
```
  This command downloads a test image and runs it in a container. When the container runs, it prints a confirmation message and exits.

Uninstall Docker

Stop Docker: sudo systemctl stop docker
Delete the Docker packages:
1. Ubuntu:
  1. sudo apt-get purge -y docker-engine docker docker.io docker-ce docker-ce-cli docker-compose-plugin
  2. sudo apt-get autoremove -y --purge docker-engine docker docker.io docker-ce docker-compose-plugin
2. CentOS:
  1. sudo yum remove docker-ce docker-ce-cli containerd.io docker-compose-plugin
  2. sudo yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine \
Remove some of the docker files:
1. Ubuntu:
  1. sudo rm -rf /var/lib/docker /etc/docker
  2. sudo rm /etc/apparmor.d/docker
  3. sudo groupdel docker
  4. sudo rm -rf /var/run/docker.sock
2. CentOS:
  1. sudo rm -rf /var/lib/docker
  2. sudo rm -rf /var/lib/containerd
  3. sudo rm -rf /etc/docker
Reboot the system: sudo reboot now

Done. You have completely removed the Docker from your system.

If you have further queries just comment on this post 😊

Install Docker on Ubuntu and CentOS

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