NDLI: CentOS Cluster Server

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CentOS Cluster Server

Content Provider	CiteSeerX
Author	Matteson, Ryan
Abstract	Presentation overview •  Tonight I am going to give an overview of CentOS cluster server, and describe what is needed to build a basic HA cluster •  This presentation assumes a basic understanding of network and clustering technology, so make sure to ask questions if you aren’t sure about something What is CentOS cluster server? •  CentOS cluster server is a suite of packages that can be used to deploy highly available services on CentOS Linux-based servers •  Based on Redhat cluster server •  Provides three main features: –  Cluster management and service failover –  Network load-balancing (LVS) –  Global read-write file system (GFS) What is required to run a cluster? •  Two or more servers that are on the HCL •  Two or more bonded NICs to send cluster heartbeat messages over (this is optional, but highly recommended!) •  Two or more bonded NICs dedicated to public network traffic •  Supported fencing solution •  Shared storage What does a cluster consist of? •  An HA cluster typically consists of the following items: –  Two or more nodes –  One or more fence devices –  Shared storage –  Public and private network interfaces –  One or more resources –  One or more services –  Quorum devices –  Failover Domains Quorum devices •  Quorum is used to ensure that a majority of nodes are available in the cluster •  Needed to avoid split-brain conditions •  Works by assigning one or more votes to each server and quorum device in the cluster •  To ensure quorum, a cluster needs to have 51 % of the available votes to form or continue running an operational cluster •  SCSI disks that support SPR are the most common type of quorum device Fencing devices •  Fencing devices provide a way for the cluster to remove an unresponsive node from the cluster •  Nodes are typically fenced when they are unresponsive, and fencing is done to prevent split brain configurations •  Several supported ways to fence nodes:
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Access Restriction	Open
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