This site best when viewed with a modern standards-compliant browser. We recommend Firefox Get Firefox!.

Linux-HA project logo
Providing Open Source High-Availability Software for Linux and other OSes since 1999.

USA Flag UK Flag

Japanese Flag


About Us

Contact Us

Legal Info

How To Contribute

Security Issues

This web page is no longer maintained. Information presented here exists only to avoid breaking historical links.
The Project stays maintained, and lives on: see the Linux-HA Reference Documentation.
To get rid of this notice, you may want to browse the old wiki instead.

1 February 2010 Hearbeat 3.0.2 released see the Release Notes

18 January 2009 Pacemaker 1.0.7 released see the Release Notes

16 November 2009 LINBIT new Heartbeat Steward see the Announcement

Last site update:
2018-01-17 03:22:16

20) Understanding about OCF RA specification

Please refer to the file resource-agent-api.txt

* (Around line 149)

  • How the RM choses an agent for a specific resource type name from the available set is implementation specific.

    But can give more definite rules for a implementation?

* (Around line 306)

  • These Global OCF environment variables seems be set by running envrionment, for example,

    RA executor. But what values should be assigned to some variables? For example, for OCF_RESOURCE_INSTANCE, OCF_RESOURCE_TYPE OCF_RESOURCE_TYPE should be the name of the resource being invoked -- for example Filesystem, or datadisk, or LinuxSCSI, or ServeRAID -- it's normally the same as the script name. As far as OCF_RESOURCE_INSTANCE, I

    think you need to ask LMB about this one... -- AlanRobertson If OCF_RESOURCE_TYPE is always the name of the resource being invoked, maybe don't need to be set it by the RA

    executor. Right? -- SunJiangDong

    Partially for my own clarification, examples of OCF_RESOURCE_TYPE are IPaddr and apache (as opposed to and myWebServer). -- AndrewBeekhof

    OCF_RESOURCE_INSTANCE is the configured name for the resource (eg. and myWebServer from above). -- AndrewBeekhof

* (Around line 168)

  • The actions are all required to be idempotent. Invoking any operation twice - in particular, the start and stop actions - shall succeed and

    leave the resource instance in the requested state.
    What's the meaning? It means that stopping twice in a row is the same as stopping once. Starting twice in a row is the same

    as starting once. Note that this is a property of the individual ResourceAgent, not of the LocalResourceManager. This means you don't have to do anything to make this happen - it's supposed to be a property of the ResourceAgent. If you wanted (for some reason) to rely on this being true, then you would be permitted to rely on this property. But, I suspect you don't care one way or the other about this property. -- AlanRobertson

    I'm making OCF compliant RA based on the former heartbeat resource agent scripts, so have to care it ;) -- SunJiangDong