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→Technical overview
== High Availability on SME8 ==
== High Availability on SME8 ==
==== Introduction ====
==== Introduction ====
The clustering technique provides many possible scenario's depending on the requirements. This could be an active/active 16-node cluster or a simple 2-node active/standby failover cluster. This How-To is will only address and focus on a '''High Available 2-node active/standby cluster, referred to as "SME-cluster"'''.
CentOS6.3 (and RHEL6) still use the same components, so the know-how you will gain from this How-To will be applicable to a possible new release of SME server based on CentOS6.3. Next to that, the most valuable know-how is about understanding and configuring the cluster and HA capabilities, which will be conceptually the same for any cluster environment. Especially since some components (dependencies) like openais, soon to be replaced by corosync (as of RHEL6), are the de facto standards for Linux/Unix. RHEL has no know plans to change this strategy for any future RHEL release.
CentOS6.3 (and RHEL6) still use the same components, so the know-how you will gain from this How-To will be applicable to a possible new release of SME server based on CentOS6.3. Next to that, the most valuable know-how is about understanding and configuring the cluster and HA capabilities, which will be conceptually the same for any cluster environment. Especially since some components (dependencies) like openais, soon to be replaced by corosync (as of RHEL6), are the de facto standards for Linux/Unix. RHEL has no know plans to change this strategy for any future RHEL release.
Clustering and HA is relatively easy to implement for there is a lot of knowledge and how-to's available from the RHEL and CentOS communities. Next to this, clustering is not a new technologie and has been around for quite some time as a proven technology. The hard part is precise planning and configuring correctly.
Clustering and HA is relatively easy to implement for there is a lot of knowledge and how-to's available from the RHEL and CentOS communities. Next to this, clustering is not a new technologie and has been around for quite some time as a proven technology. The hard part is precise planning and configuring correctly.
==== Disclaimer ====
==== Disclaimer ====
* rgmanager, the services manager
* rgmanager, the services manager
* drbd, the device block driver
* drbd, the device block driver
and their dependencies which will be installed automatically by yum.
and their dependencies which will be installed automatically by yum. The compete list of packages that will be installed is:
TBA
The compete list of packages that will be installes is:
There is also a webgui component called luci, but this will not be used for it is not working correctly on SME8. Configuration of the cluster will be done with the tools that come with the above applications.
There is also a webgui component called luci, but this will not be used for it is not working correctly on SME8. Configuration of the cluster will be done with the tools that come with the above applications.
==== Planning ====
==== Planning ====