10.4.2. Docker Properties

Before configuring a Docker bundle in Pacemaker, the user must install Docker and supply a fully configured Docker image on every node allowed to run the bundle.

Pacemaker will create an implicit ocf:heartbeat:docker resource to manage a bundle’s Docker container. The user must ensure that resource agent is installed on every node allowed to run the bundle.

Table 10.13. Properties of a Bundle’s Docker Element

Field	Default	Description
`image`		Docker image tag (required)
`replicas`	Value of `masters` if that is positive, else 1	A positive integer specifying the number of container instances to launch
`replicas-per-host`	1	A positive integer specifying the number of container instances allowed to run on a single node
`masters`	0	A non-negative integer that, if positive, indicates that the containerized service should be treated as a multistate service, with this many replicas allowed to run the service in the master role
`network`		If specified, this will be passed to `docker run` as the network setting for the Docker container.
`run-command`	`/usr/sbin/pacemaker_remoted` if bundle contains a `primitive`, otherwise none	This command will be run inside the container when launching it ("PID 1"). If the bundle contains a `primitive`, this command must start pacemaker_remoted (but could, for example, be a script that does other stuff, too).
`options`		Extra command-line options to pass to `docker run`