1. Amazon Linux EC2 Instance

1. Install docker and start docker services

   yum install docker -y
   docker --version 
   
   # start docker services
   service docker start
   service docker status

2. Create a user called dockeradmin

   useradd dockeradmin
   passwd dockeradmin

3. add a user to docker group to manage docker

   usermod -aG docker dockeradmin
   

1. Create a tomcat docker container by pulling a docker image from the public docker registry

   docker run -d --name test-tomcat-server -p 8090:8080 tomcat:latest

Please follow below steps to install docker CE on CentoOS server instance. For RedHat only Docker EE available

1. Install the required packages.

   sudo yum install -y yum-utils \
   device-mapper-persistent-data \
   lvm2

2. Use the following command to set up the stable repository.

   sudo yum-config-manager \
   --add-repo \
   https://download.docker.com/linux/centos/docker-ce.repo

1. Install the latest version of Docker CE.

   sudo yum install docker-ce

   Note: If prompted to accept the GPG key, verify that the fingerprint matches 060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35, and if so, accept it.

2. Start Docker.

   sudo systemctl start docker

3. Verify that docker is installed correctly by running the hello-world image.

   sudo docker run hello-world