Depending on your installation, docker may or not already be installed. If docker is not installed, please follow the below steps to install it: 

  • Add the yum repo 

$ sudo tee /etc/yum.repos.d/docker.repo <<-'EOF' 

  [dockerrepo] 

  name=Docker Repository 

  baseurl=https://yum.dockerproject.org/repo/main/centos/7/ 

  enabled=1 

  gpgcheck=1 

  gpgkey=https://yum.dockerproject.org/gpg 

  EOF 

  • Install Docker 

$ sudo yum install docker-engine -y 


  • Start Docker 

$ sudo service docker start 


  • Follow the section below to allow the Blue Relay service to run docker


Allow the Blue Relay service to run Docker 
On RHELsystems, since the Blue Relay application is not running as root, it’s necessary to ensure the Blue Relay service can use the docker service. Please execute the following commands to add the “bluerelay” user to the existing docker group. 


To ensure the Blue Relay service can use the docker service, please execute the following commands to add the “bluerelay” user to the existing docker group. Note: “bluerelay” can be substituted for any other non-root user account on the system required to run docker. Also note, executing the command “reboot” will result in some system downtime. Please ensure that the BlueRelay-tomcat and httpd-bluerelay services have started again once the system is back up and running.


$ sudo groupadd docker 

$ sudo usermod -aG docker bluerelay 

$ sudo reboot