Install docker and run a container of Tomcat on CentOS.

install-docker.sh

#!/bin/bash
# Program:
#       Install docker engine.
# History:
# 2016/09/01    Anson   First release
# 2016/09/02    Anson   Second release: tomcat:8.5 & verify docker command is exist

# Set environment path.
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

# Check whether docker is installed or not. Install docker if docker command is not exist.
if ! type "docker" > /dev/null; then
 yum update
 curl -fsSL https://get.docker.com/ | sh
fi

# Execute docker as a service.
service docker start

# Create directories and change owner.
mkdir /home/username/docker
chown username /home/username/docker
mkdir /home/username/docker/webapps
chown username /home/username/docker/webapps
mkdir /home/username/docker/logs
chown username /home/username/docker/logs

# Run tomcat as a docker container.
docker run -d -p 0.0.0.0:80:8080 -v /home/username/docker/webapps:/usr/local/tomcat/webapps -v /home/username/docker/logs:/usr/local/tomcat/logs --name webservice tomcat:8.5