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ha-manager: add short section about resources

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Dietmar Maurer 2016-03-15 19:17:13 +01:00
parent 871e1fd656
commit 5bd515d441
1 changed files with 24 additions and 21 deletions
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ha-manager.adoc
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@ -109,27 +109,36 @@ hard and costly. 'ha-manager' has typical error detection and failover
times of about 2 minutes, so you can get no more than 99.999%
availability.
Requirements
------------
* at least three cluster nodes (to get reliable quorum)
* shared storage for VMs and containers
* hardware redundancy (everywhere)
* hardware watchdog - if not available we fall back to the
linux kernel software watchdog ('softdog')
* optional hardware fencing devices
Resources
---------
A resource (sometimes also called service) is uniquely identified by a
service ID (SID) which consists of the service type and an type
specific id, e.g.: 'vm:100'. That example would be a service of type
vm (Virtual machine) with the VMID 100.
We call the primary management unit handled by 'ha-manager' a
resource. A resource (also called "service") is uniquely
identified by a service ID (SID), which consists of the resource type
and an type specific ID, e.g.: 'vm:100'. That example would be a
resource of type 'vm' (virtual machine) with the ID 100.
For now we have two important resources types - virtual machines and
containers. One basic idea here is that we can bundle related software
into such VM or container, so there is no need to compose one big
service from other services, like it was done with 'rgmanager'. In
general, a HA enabled resource should not depend on other resources.
Requirements
------------
* at least three nodes
* shared storage
* hardware redundancy
* hardware watchdog - if not available we fall back to the
linux kernel soft dog
How It Works
------------
@ -284,12 +293,6 @@ If you have a hardware watchdog available remove its module from the blacklist
and restart 'the watchdog-mux' service.
Resource/Service Agents
-------------------------
A resource or also called service can be managed by the
ha-manager. Currently we support virtual machines and container.
Groups
------