= Docker HowTo Auto Start Containers On Reboot

An explanation for systemd as a process manager can be found at :

   {{{https://docs.docker.com/engine/admin/host_integration/}}}

Once you are happy with your docker images and container, you must us systemd to restart them.

1. Go to the directory :

   {{{/etc/systemd/system}}}

This directory contains all .service files that are used to start docker containers.

2. Check what docker services are enabled on start up

   {{{systemctl list-unit-files | grep docker}}}

This will list out all the services that are enabled.

3. To create a new service called '''docker-[containername].service''' : 

   {{{sudo vi /etc/systemd/system/docker-[containername].service}}}

add the contents similar to the following, but change {{{Description ExecStart ExecStop}}} :

   {{{[Unit]}}}

   {{{Description=Redcap 5.7.0 container}}}

   {{{Requires=docker.service}}}

   {{{After=docker.service}}}

   {{{ }}}

   {{{[Service]}}}

   {{{Restart=always}}}

   {{{ExecStart=/usr/bin/docker run -itd -p 81:80 lcbruit/redcap:v1}}}

   {{{ExecStop=/usr/bin/docker stop -t 2 lcbruit/redcap:v1}}}

   {{{ }}}

   {{{[Install]}}}

   {{{WantedBy=default.target}}}

4. If you have a new container build modify the content of this file.

5. To activate the service run the following commands (rename service name) :

   {{{systemctl daemon-reload}}}

   {{{systemctl start docker-redcap_5.7.0.service}}}

   {{{systemctl enable docker-redcap_5.7.0.service}}}

6. To disable a service run the following commands (rename service name) :

   {{{systemctl stop docker-redcap_5.7.0.service}}}

   {{{systemctl disable docker-redcap_5.7.0.service}}}

7. Change will only come to effect on a reboot

   {{{sudo reboot}}}