BootIP vs Persistent IP in HACMP Post: 302977083

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Operating Systems AIX BootIP vs Persistent IP in HACMP Post 302977083 by bakunin on Tuesday 12th of July 2016 09:38:27 AM

07-12-2016

Registered User

Quote:

Originally Posted by mrmurdock

However the term "Boot IP" for some reason is messing with my head. Have not done HACMP since the 4.1.2.X days.

I understand the Persistent IP and the service IP just fine.

"Persistent IP" and "boot IP" means (nowadays) the same. Back then, in the times before HACMP 5.x, there were three types of addresses one of which was called "boot", but nowadays - that is, from HACMP 5.x onwards - there are only (in HACMP-speak) "service" and "non-service" (persistent) addresses.

Every adapter has a "non-service" IP which it comes up with at boot time. It will always retain this IP address as long as it is up.

For every "service" (or "resource group", which effectively means the same) there might be a "service IP", under which the service (i.e. a database) can be reached over the network.

Each resource group consists of:

1) one or more VGs, which are brought online (and their filesystems mounted) when the RG starts

2) an "application controller": this is a collection of a "start" script and a "stop" script, one of which is executed at RG going online, one when the RG goes offline

3) an optional "application monitor": a script which is executed regularly and may check (and maybe take some corrective action) for the running application

4) an optional service IP, which is added as an IP-alias when the RG has started.

For HACMP the process of starting a RG is:
- varyon VGs, ount FSes
- execute start-script of App-controller
- add service IP as IP-Alias to certain interface
- as long as RG is online: execute app-monitor regularly (if there is one)

The takeover of the RG means:
- on Node1 remove IP-Alias
- on Node1 execute stop-script of App-controller
- on Node1 umount FSes and varyoff VGs
- on Node2 execute start-procedure as described above

It is possible to configure service-IPs to be activated before (instead of the default after) mounting FSes and define certain dependency rules for RGs (like "active this RG only after the other RG is activated", etc.).

I hope this helps.

bakunin

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LEARN ABOUT DEBIAN

clurgmgrd

clusvcmgrd(8)						       Red Hat Cluster Suite						     clusvcmgrd(8)

NAME

       rgmanager - Resource Group (Cluster Service) Manager Daemon

DESCRIPTION

       rgmanager  handles  management  of  user-defined cluster services (also known as resource groups).  This includes handling of user requests
       including service start, service disable, service relocate, and service restart.  The service manager daemon also  handles  restarting  and
       relocating services in the event of failures.

HOW IT WORKS

       The  service  manager is spawned by an init script after the cluster infrastructure has been started and only functions when the cluster is
       quorate and locks are working.

       During initialization, the service manager runs scripts which ensure that all services are clear to be started.	After that, it	determines
       which services need to be started and starts them.

       When an event is received, members which are no longer online have their services taken away from them.	The event should only occur in the
       case that the member has been fenced whenever fencing is available.

       When a cluster member determines that it is no longer in the cluster quorum, the service manager stops all services and	waits  for  a  new
       quorum to form.

COMMAND LINE OPTIONS

       -f     Run in the foreground (do not fork).

       -d     Enable debug-level logging.

       -w     Disable internal process monitoring (for debugging).

       -N     Do  not perform stop-before-start.  Combined with the -Z flag to clusvcadm, this can be used to allow rgmanager to be upgraded with-
	      out stopping a given user service or set of services.

SEE ALSO

       clusvcadm(8)

								     Jan 2005							     clusvcmgrd(8)

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