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How to change instance private IP addresses for FlashGrid Cluster nodes (Azure)

  • Updated
  • Products: FlashGrid Cluster on Azure

Typically instance Private IP addresses do not change during the life time of a cluster. However, in some cases it might be required to change the instance IP addresses after a cluster is already deployed.

Note: This procedure requires stopping the entire cluster.

Stop Oracle resources before reconfiguring IP addresses:

  1. Stop all database instances

  2. Stop clusterware on all nodes 
    # crsctl stop cluster -all

To change private IP addresses, run the following steps for EACH node of the cluster:

  1. Stop FlashGrid Storage Fabric and CLAN services:
$ sudo flashgrid-node stop
$ sudo systemctl stop flashgrid-clan
  1. Temporarily remove the immutable attribute for /etc/hosts file:
$ sudo chattr -i /etc/hosts

  1. Update the IP adresses in /etc/hosts file.

  2. Restore the immutable attribute on /etc/hosts file:
$ sudo chattr +i /etc/hosts

  1. Stop the node VM (using Azure console).

  2. Change the private IP addresses of the node (Azure console) (assignment must be changed to static in case it was dynamic).

Start the cluster:

  1. Start all nodes (Azure console).

  2. On the first database node deploy the CLAN configuration to all nodes:
$ sudo flashgrid-clan-cfg deploy-config

The output must show - "Reloading CLAN service" on all nodes and "deployment successful" on all other database and quorum nodes.

  1. Wait until services are started and check the status (as user fg or root):
# flashgrid-cluster