CentOS High Availability

By Mitja Resman

The excessive functionality and balance of CentOS Linux are the foremost elements that make CentOS Linux the fitting Linux distribution to construct excessive availability strategies on. This ebook introduces you to excessive availability ahead of in brief jogging you thru the cluster stack and its layers. The booklet is then divided into components, half A and half B, in line with CentOS models 6 and seven respectively. each one half starts off with the install and configuration of the Corosync cluster messaging software program with CMAN or with the Pacemaker cluster source administration software.

You can also be brought to cluster provider configuration and cluster provider administration earlier than you configure fencing or STONITH on CentOS 6 and CentOS 7. by way of the top of this e-book, you've gotten the talents required to independently layout, enforce, and hold a CentOS excessive availability multinode cluster environment.

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Cost the cluster prestige to verify that the recent cluster node has effectively joined the cluster. during this screenshot, one can find the cluster prestige command output with the node-4. geekpeek. web cluster node effectively joined to the cluster: [ 126 ] Chapter eleven Cluster node standby mode Pacemaker enables you to positioned the specified cluster node into standby mode. whilst a cluster node is in standby mode, it is going to now not be capable of host cluster assets and companies. The standby mode comes in handy for cluster node upkeep operations. The syntax to place a cluster node in standby mode is as follows: desktops cluster standby node_name the following, the node_name parameter is the identify of the cluster node you need to installed standby mode because it seems while working the computers prestige command. the next is the syntax used to take a cluster node out of standby mode: desktops cluster unstandby node_name the following, the node_name parameter is the identify of the cluster node you must take out standby mode because it looks whilst working the desktops prestige command. you could placed a cluster node referred to as node-4. geekpeek. internet into standby mode with the next command: computers cluster standby node-4. geekpeek. internet during this screenshot, you'll find the command used to place the node-4. geekpeek. internet cluster node in standby mode: [ 127 ] Playing with Cluster Nodes on CentOS 7 within the following screenshot, you will see the output of the cluster prestige command and make sure that the node-4. geekpeek. internet cluster node is in standby mode: you could take a cluster node referred to as node-4. geekpeek. web out of standby mode utilizing the subsequent command: desktops cluster unstandby node-4. geekpeek. internet during this screenshot, you'll find the command used to take the node-4. geekpeek. internet cluster node out of standby mode: [ 128 ] Chapter eleven within the following screenshot, you will discover the output of the cluster prestige command and make sure that the node-4. geekpeek. internet cluster node isn't any longer in standby mode: elimination a cluster node Shutting down a cluster node is a technique to disable it, yet you need to additionally methods to eliminate a cluster node from a operating cluster configuration. removal a cluster node from a cluster configuration doesn't require cluster carrier downtime, except the cluster provider is operating at the cluster node you wish to get rid of. sooner than you begin the method of elimination a cluster node from the cluster configuration, ensure that no cluster assets and prone are operating at the node. [ 129 ] Playing with Cluster Nodes on CentOS 7 you could eliminate a cluster node from an current configuration through following those steps: 1. get rid of the cluster node from Corosync: Edit the corosync. conf configuration dossier on all cluster nodes and take away the specified cluster node from the nodelist part. you could obtain an instance cluster node corosync. conf configuration dossier, the place the node-4. geekpeek. web cluster node used to be faraway from the cluster configuration, from the corosyncconf-2. txt dossier within the code package. make sure you eliminate the cluster node from the corosync.

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