Question: How to change pacemaker cluster heartbeat timeout in CentOS/RHEL 7? By default, the heartbeat of pacemaker in CentOS/RHEL 7 is set to 1000(ms), you could increase it by the below steps. 1. Appending/Chaning the token to the totem section in the corosync config file /etc/corosync/corosync.conf. # cat /etc/corosync/corosync.conf totem { version: 2 cluster_name: pcmk secauth: off transport: udpu token: 10000 … [Read more...] about How To Change Pacemaker Cluster Heartbeat Timeout In CentOS/RHEL 7
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How to Configure Multiple Fencing-device Levels in Pacemaker Cluster
Configuring storage fencing Next, to configuring fencing to power-cycle a node (or to simply turn it off), fencing can also be configured to shut a faulty node off from shared storage. This is called storage fencing or SCSI fencing. SCSI fencing is implemented in the Red Hat Enterprise Linux High Availability Add-on using the fence_scsi fencing agent. When fence_scsi is used, whenever a cluster node starts it will create a SCSI reservation for itself using a key. Once one or more keys are … [Read more...] about How to Configure Multiple Fencing-device Levels in Pacemaker Cluster
Configuring Network Redundancy for PaceMaker Cluster Communication
What is Redundant Ring Protocol Redundant Ring Protocol (RRP) is a communication protocol where corosync can use two separate networks to establish connections between cluster nodes. When one network fails, communication can continue over the second network. RRP is not a replacement for network channel bonding; instead, bonded interfaces can be used to connect to the two rings for further redundancy. Where bonded interfaces protect against hardware failures (NIC, network cable, switch), RRP … [Read more...] about Configuring Network Redundancy for PaceMaker Cluster Communication
How to Create a GFS2 Formatted Cluster File System
Global File System 2 (GFS2) Global File System 2 (GFS2) is a cluster file system interfacing directly with the kernel VFS layer. This means that the same file system can be mounted and used by multiple cluster nodes simultaneously, while still providing a full regular file system, including features such as support for POSIX ACLs, extended attributes, and quotas. To accomplish this, every node accessing a GFS2 file system uses the cluster infrastructure provided by Corosync and Pacemaker to … [Read more...] about How to Create a GFS2 Formatted Cluster File System
Beginners Guide to Global File System 2 (GFS2)
Global File System 2 (GFS2) Global File System 2 (GFS2) is a cluster file system interfacing directly with the kernel VFS layer. This means that the same file system can be mounted and used by multiple cluster nodes simultaneously, while still providing a full regular file system, including features such as support for POSIX ACLs, extended attributes, and quotas. To accomplish this, every node accessing a GFS2 file system uses the cluster infrastructure provided by Corosync and Pacemaker to … [Read more...] about Beginners Guide to Global File System 2 (GFS2)
Managing Clustered Logical Volumes in RHEL Cluster (pacemaker)
Clustered LVM Clustered LVM allows the use of regular LVM volume groups and logical volumes on shared storage. In a cluster configured with clustered LVM, a volume group and its logical volumes are accessible to all cluster nodes at the same time. With clustered LVM, administrators can use the management benefits of LVM in conjunction with a shared file system like GFS2, for scenarios such as making virtual machine images inside logical volumes available to all cluster nodes. The … [Read more...] about Managing Clustered Logical Volumes in RHEL Cluster (pacemaker)