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Full Discussion: Cluster a custom application
Top Forums UNIX for Beginners Questions & Answers Cluster a custom application Post 303034528 by Peasant on Sunday 28th of April 2019 02:52:31 AM
Old 04-28-2019
Any systemd or init script can be implemented in linux cluster as a resource.
So, you will need to write one of those, it should be fairly simple reading the docs.

Be sure to use resource group, as resources in it will follow constraint order, start from first defined to last, stop from last defined to first.

But, applications are mostly load balanced not clustered in classic way, as stomp mentioned.
Can you elaborate more on your application receiving data on any port, does it listen on thousands of ports Smilie

Using opensource with haproxy and keepalived one can do great things with backend app balancing and failover using VRRP.
Fairly short and simple configuration, unlike linux cluster which is a complex product.
Keep it simple, stupid if you can.

Hope that helps.
Regards
Peasant.
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cmruncl(1m)															       cmruncl(1m)

NAME
cmruncl - run a high availability cluster SYNOPSIS
cmruncl [-f] [-v] [-n node_name...] [-t | -w none] DESCRIPTION
cmruncl causes all nodes in a configured cluster or all nodes specified to start their cluster daemons and form a new cluster. To start a cluster, a user must either be superuser(UID=0), or have an access policy of FULL_ADMIN allowed in the cluster configuration file. See access policy in cmquerycl(1m). This command should only be run when the cluster is not active on any of the configured nodes. This command verifies the network configu- ration before causing the nodes to start their cluster daemons. If a cluster is already running on a subset of the nodes, the cmrunnode command should be used to start the remaining nodes and force them to join the existing cluster. If node_name is not specified, the cluster daemons will be started on all the nodes in the cluster. All nodes in the cluster must be available for the cluster to start unless a subset of nodes is specified. Options cmruncl supports the following options: -f Force cluster startup without warning message and continuation prompt that are printed with the -n option. -v Verbose output will be displayed. -t Test only. Provide an assessment of the package placement without affecting the current state of the nodes or packages. The -w option is not required with the -t option as -t does not validate network connectivity, but assumes that all the nodes can meet any external dependencies such as EMS resources, package subnets, and storage. -n node_name... Start the cluster daemon on the specified subset of node(s). -w none By default network probing is performed to check that the network connectivity is the same as when the cluster was config- ured. Any anomalies are reported before the cluster daemons are started. The -w none option disables this probing. The option should only be used if this network configuration is known to be correct from a recent check. RETURN VALUE cmruncl returns the following value: 0 Successful completion. 1 Command failed. EXAMPLES
Run the cluster daemon: cmruncl Run the cluster daemons on node1 and node2: cmruncl -n node1 -n node2 AUTHOR
cmruncl was developed by HP. SEE ALSO
cmquerycl(1m), cmhaltcl(1m), cmhaltnode(1m), cmrunnode(1m), cmviewcl(1m), cmeval(1m). Requires Optional Serviceguard Software cmruncl(1m)
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