By Mitja Resman
The excessive functionality and balance of CentOS Linux are the main elements that make CentOS Linux definitely the right Linux distribution to construct excessive availability suggestions on. This ebook introduces you to excessive availability ahead of in brief strolling you thru the cluster stack and its layers. The booklet is then divided into components, half A and half B, according to CentOS types 6 and seven respectively. each one half starts off with the set up 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 carrier administration ahead of you configure fencing or STONITH on CentOS 6 and CentOS 7. by way of the tip of this publication, you could have the abilities required to independently layout, enforce, and keep a CentOS excessive availability multinode cluster environment.
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Community configuration you want to configure a static IP tackle for all to be had community interfaces on all cluster nodes. you are able to do this through enhancing the /etc/sysconfig/network-scripts/ ifcfg-enpXsY records. [ 86 ] Chapter nine within the following screenshot, you will see that the community interface configuration for the node-1 cluster node: switch the BOOTPROTO line to none. This specifies that no boot protocol is used for this interface, on the grounds that this interface has a static IP tackle. upload the IPADDR, NETMASK, and GATEWAY strains in response to your setting and networking configuration. [ 87 ] Cluster Stack software program on CentOS 7 you could thoroughly eliminate the NetworkManager provider. during this screenshot, you will discover the command used to take away the NetworkManager provider from the process: then again, you could cease and disable the NetworkManager provider solely with out removal it. within the following screenshot, you will find the instructions used to prevent the NetworkManager carrier and disable NetworkManager from beginning at boot: you want to eliminate or disable the NetworkManager provider since you may want to steer clear of any computerized configuration of community interfaces in your cluster nodes. After removal or disabling the NetworkManager provider, you need to restart the networking carrier. during this screenshot, you will see that the command used to restart the community provider: you want to reconfigure the community interfaces and restart the networking provider on all cluster nodes. additionally remember to take away, or cease and disable, the NetworkManager provider. [ 88 ] Chapter nine NTP configuration you need to set up and begin the NTP time synchronization carrier to keep up constant time through the cluster. within the following screenshot, you'll discover the command used to put in the NTP time synchronization provider: through default, the NTP deploy time is synchronized with the legitimate CentOS NTP servers. that allows you to switch this, edit the NTP configuration dossier at /etc/ntp. conf. commence the NTP carrier and ensure it begins at boot. during this screenshot, you can find the instructions used to begin the ntpd provider and make it commence at boot time: you want to set up and begin the NTP provider on all cluster nodes. additionally remember to make it begin at boot. DNS configuration you want to configure the area identify servers, totally certified domains, and the hosts dossier. The area identify provider is supplied through the DNS servers which are configured within the /etc/resolv. conf dossier. it's endorsed you configure at the least DNS servers; upload extra in case you like. [ 89 ] Cluster Stack software program on CentOS 7 you want to edit the /etc/resolv. conf dossier and insert the IP addresses of your DNS servers. within the following screenshot, you'll find the DNS configuration at the node-1 cluster node: you need to additionally configure the absolutely certified domains (FQDN) for the cluster nodes by way of enhancing the /etc/hostname dossier and placing the FQDN of your cluster node. during this screenshot, you will discover the FQDN configuration of the node-1 cluster node: observe that cluster node reboot is needed for hostname adjustments to take impression.