RHCS 2 Overview - Revision history

Digimer: /* Administration */

2011-03-10T21:14:29Z

Administration

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 '''Note''': [[RHCS]] supports up to 16 nodes under [[EL5]].
 == Considerations ==
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 * [[IPv6]] is '''note''' supported on [[EL5]] clusters.
 ==== Ports To Open ====
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Digimer: /* Administration */

2011-03-10T16:04:50Z

Administration

← Older revision		Revision as of 16:04, 10 March 2011
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	* Fencing is required for any cluster with shared storage, period. No, <span class="code">fence_manual</span> is '''''not''''' supported.		* Fencing is required for any cluster with shared storage, period. No, <span class="code">fence_manual</span> is '''''not''''' supported.
	* Bonding is recommended to protect against single-link failures.		* Bonding is recommended to protect against single-link failures.
			* If using on-board out-of-band management, like [[IPMI]], then you must install [[ACPI]] and have it working to ensure immediate and complete shutdown. Further, you must disable ''ACPI Soft-Off'. Leaving it enabled could cause slow recovery or, possibly, a failed fence call which would, in turn, hang the cluster. You have a few options for disabling ''ACPI Soft-Off''. In order of preference, they are:
			** Use <span class="code">chkconfig --del acpid</span>
			** Change the node's [[BIOS]] to ''Instant Off'' on power-button press (or equivalent) (sec. 2.4.2).
			** Append <span class="code">acpi=off</span> to the kernel options in <span class="code">/boot/grub/grub.conf</span>. Use this as a last resort as some machines will fail to boot with [[ACPI]] completely disabled (sec. 2.4.3).

	=== Network ===		=== Network ===
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	\|[[UDP]]		\|[[UDP]]
	\|<span class="code">[[cman]]</span>		\|<span class="code">[[cman]]</span>
			\|-
			\|<span class="code">8084</span>, <span class="code">5405</span>
			\|[[TCP]]
			\|<span class="code">[[luci]]</span>
	\|-		\|-
	\|<span class="code">11111</span>		\|<span class="code">11111</span>

Digimer: /* Administration */

2011-03-10T15:42:23Z

Administration

@@ Line 91: / Line 91: @@
 == Services ==
-A service consists of one or more resources assigned to a failover domain and configured with a failure policy.
+A service consists of one or more resources assigned to a failover domain and configured with a failure policy. A service can only run on one node at a time.
 == Considerations ==
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 '''Note''': Prior to [[EL5]].5, [[Red Hat]] supported GFS and GFS2 on single-nodes. This is no longer supported. You can still mount a GFS2 partition on a single node only, but it must be seen by all nodes.
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Digimer: /* Administration */

2011-03-10T13:22:37Z

Administration

← Older revision		Revision as of 13:22, 10 March 2011
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	These notes came from [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/pdf/Cluster_Administration/Red_Hat_Enterprise_Linux-5-Cluster_Administration-en-US.pdf this] [[Red Hat]] [[PDF]] ([http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Cluster_Administration/index.html single], [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Administration/index.html multiple] [[HTML]] pages		These notes came from [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/pdf/Cluster_Administration/Red_Hat_Enterprise_Linux-5-Cluster_Administration-en-US.pdf this] [[Red Hat]] [[PDF]] ([http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Cluster_Administration/index.html single], [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Administration/index.html multiple] [[HTML]] pages

			'''Note''': [[RHCS]] supports up to 16 nodes under [[EL5]].

			== Failover Domains ==

			These are not required in a cluster. When used, the provide a subset of nodes (from one node to all nodes) that a given service or resource can or should run on.

			== Resources ==

			Resources are items that can be used by any cluster node. These can be IP addresses, filesystem mounts, user-created scripts and so on. Resources can be public or private.

			=== Private Resources ===

			A private resource can only be used with one service.

			=== Public Resources ===

			A public resource can be used with multiple services.

			== Services ==

			A service consists of one or more resources assigned to a failover domain and configured with a failure policy.

			== Considerations ==

			This section discuses particular considerations to bear in mind when using various cluster-aware services.

			=== GFS2 ===

			All nodes in a cluster must be aware of [[GFS2]] (and [[GFS]]) partitions, regardless of whether a given node ever intends to use it. Ensure that you consider this when creating the GFS2 filesystem. Define the total number of nodes in your cluster, not simply a total of the nodes you plan to mount the GFS2 partition on.

			'''Note''': Prior to [[EL5]].5, [[Red Hat]] supported GFS and GFS2 on single-nodes. This is no longer supported. You can still mount a GFS2 partition on a single node only, but it must be seen by all nodes.

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Digimer: /* Overview */

2011-03-09T04:47:53Z

Overview

← Older revision		Revision as of 04:47, 9 March 2011
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	* GFS2: Global File System (version 2)		* GFS2: Global File System (version 2)
	* GNDB: Global Network Block Device		* GNDB: Global Network Block Device

			== Notes ==

			[[DRBD]] can not be used as a [[qdisk]] device. Fails subtly and fatally.

	= Administration =		= Administration =

Digimer: /* Overview */

2011-03-09T04:03:31Z

Overview

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 * Cluster Logical Volume Manager ([[CLVM]]) - Provides volume management of cluster storage.
 * Global Network Block Device ([[GNBD]]) - An ancillary component of GFS/GFS2 that exports block-level storage to Ethernet. This is an economical way to make block-level storage available to GFS2.
 == Acronyms ==

Digimer: /* Overview */

2011-03-08T23:07:51Z

Overview

← Older revision		Revision as of 23:07, 8 March 2011
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	These notes came from [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/pdf/Cluster_Suite_Overview/Red_Hat_Enterprise_Linux-5-Cluster_Suite_Overview-en-US.pdf this] [[Red Hat]] [[PDF]] ([http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Cluster_Suite_Overview/index.html single], [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Suite_Overview/index.html multiple] [[HTML]] pages).		These notes came from [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/pdf/Cluster_Suite_Overview/Red_Hat_Enterprise_Linux-5-Cluster_Suite_Overview-en-US.pdf this] [[Red Hat]] [[PDF]] ([http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Cluster_Suite_Overview/index.html single], [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Suite_Overview/index.html multiple] [[HTML]] pages).

			== Types ==

			Four major types of clusters:

			* Storage (GFS/GFS2)
			* High availability (aka "Failover Cluster", High Availability Systems Management)
			* Load balancing (Linux Virtual Server)
			* High performance (aka "Computational Cluster" or "Grid Computing")

			Implemented clusters can combine the above types.

			== RHCS Components ==

			* Cluster infrastructure - Provides fundamental functions for nodes to work together as a cluster: configuration-file management, membership management, lock management, and fencing.
			* High-availability Service Management - Provides failover of services from one cluster node to another in case a node becomes inoperative.
			* Cluster administration tools - Configuration and management tools for setting up, configuring, and managing a Red Hat cluster. The tools are for use with the Cluster Infrastructure components, the High-availability and Service Management components, and storage.
			* Linux Virtual Server ([[LVS]]) - Routing software that provides IP-Load-balancing. LVS runs in a pair of redundant servers that distributes client requests evenly to real servers that are behind the LVS servers.

			Optional components that are outside the scope of [[RHCS]] are:

			* GFS2 - Global File System v2 provides a cluster file system for use with Red Hat Cluster Suite. GFS/GFS2 allows multiple nodes to share storage at a block level as if the storage were connected locally to each cluster node.
			* Cluster Logical Volume Manager ([[CLVM]]) - Provides volume management of cluster storage.
			* Global Network Block Device ([[GNBD]]) - An ancillary component of GFS/GFS2 that exports block-level storage to Ethernet. This is an economical way to make block-level storage available to GFS2.

			== Acronyms ==

			* CCS: Cluster Configuration System
			* CLVM: Clustered Logical Volume Manager
			* CMAN: Cluster MANager
			* DLM: Distributed Lock Manager
			* GFS2: Global File System (version 2)
			* GNDB: Global Network Block Device

	= Administration =		= Administration =

Digimer: Created page with '{{header}} '''Note''': This is a dumping ground for me to use while reading more into detail on RHCS v2 clustering. = Overview = These notes came from [http://docs…'

2011-03-08T21:12:17Z

Created page with '{{header}} '''Note''': This is a dumping ground for me to use while reading more into detail on RHCS v2 clustering. = Overview = These notes came from [http://docs…'

Páàjì titun

{{header}}

'''Note''': This is a dumping ground for [[Digimer|me]] to use while reading more into detail on RHCS v2 clustering.

= Overview =

These notes came from [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/pdf/Cluster_Suite_Overview/Red_Hat_Enterprise_Linux-5-Cluster_Suite_Overview-en-US.pdf this] [[Red Hat]] [[PDF]] ([http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Cluster_Suite_Overview/index.html single], [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Suite_Overview/index.html multiple] [[HTML]] pages).

= Administration =

These notes came from [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/pdf/Cluster_Administration/Red_Hat_Enterprise_Linux-5-Cluster_Administration-en-US.pdf this] [[Red Hat]] [[PDF]] ([http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Cluster_Administration/index.html single], [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Administration/index.html multiple] [[HTML]] pages

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