Apps DBA Workshop

In this blogpost we will see how we can use the GFS2 (Global File System 2) on Oracle Linux 9 allows multiple cluster nodes to concurrently access a shared block storage device—ideal for highly available applications in a clustered environment (e.g., with KVM, OLVM, or Pacemaker clusters). Prerequisites: System Requirements Oracle Linux 9 with UEK kernel Shared block storage (iSCSI, FC, or shared disk) 1. Cluster infrastructure (Pacemaker/Corosync) Fencing configured (GFS2 requires it) Install Required Packages (on all nodes): bash#dnf install -y gfs2-utils lvm2-cluster pcs fence-agents-all 2. Enable and Start Cluster Services: bash#systemctl enable --now pcsd bash#echo "yourpassword" | passwd --stdin hacluster bash#pcs host auth node1 node2 node3 -u hacluster -p yourpassword bash#pcs cluster setup --name gfscluster node1 node2 node3 bash#pcs cluster start --all bash#pcs cluster enable --all 3. Configure Shared Storage: If using LVM, make sure to enable cluster...