Installation of Docker in Centos

This blog will help you to install and understand docker on centos and mentioned steps will be helpful for your centos to update kernel version.

Below are the steps to install docker container and start working on it. As I have installed docker on Centos Server, below are the steps to install on it.

  • System Requirement

  • 1) Kernel must be 3.10 or more then that.
  • 2) device-mapper-libs must be installed on it.
Blog images

Steps are as below

Step1: Install 3.0 or later version of kernel

                    
                    apiVersion: apps/v1
                    kind: Deployment
                    metadata:
                    name: nginx-deployment
                    labels:
                        app: nginx
                    spec:
                    replicas: 10
                    selector:
                        matchLabels:
                        app: nginx
                    template:
                        metadata:
                        labels:
                            app: nginx
                        spec:
                        containers:
                        - name: nginx
                            image: nginx:1.14.2
                            ports:
                            - containerPort: 80

Step2: Installation of Docker packge repository

                    
                        sudo tee /etc/yum.repos.d/docker.repo <<-'EOF'
                        [dockerrepo]
                        name=Docker Repository
                        baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/
                        enabled=1
                        gpgcheck=1
                        gpgkey=https://yum.dockerproject.org/gpg
                        EOF

Step3: Installation and Start docker service.

                    
                        yum install docker-engine
                        service docker restart
                        you can check logs by executing below command
                        tail -f /var/log/docker
                        Now Press CTRL+C

Step4: Start your hello-word container.

                    
                        docker run hello-world
                        docker ps -a
                        You will see there will be 1 container running on your server with named hello-world

Nginx Docker setup

                
                    # Pull the Nginx image
                    docker pull nginx
                    
                    # Run Nginx container
                    docker run --name docker-nginx -p 80:80 nginx
                    
                    # Create and navigate to HTML directory
                    mkdir -p ~/docker-nginx/html
                    cd ~/docker-nginx/html
                    vim index.html
                    
                    # Check running containers
                    docker ps -a
                    
                    # Stop and remove Nginx container
                    docker stop docker-nginx
                    docker ps -a
                    docker rm docker-nginx
                    
                    # Run Nginx container with mounted volume
                    docker run --name docker-nginx -p 80:80 -d -v ~/docker-nginx/html:/usr/share/nginx/html nginx
                    
                    # Attach to the running container
                    docker exec -i -t 2f9f1cacb645 /bin/bash
                    
                    # Now, check the Nginx service inside the container
                    # Access it by browsing the host machine's IP