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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.
This User Gave Thanks to Peasant For This Post:
 

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KEEPALIVED(8)						      System Manager's Manual						     KEEPALIVED(8)

NAME
keepalived - load-balancing and high-availability service SYNOPSIS
keepalived [-f|--use-file=FILE] [-P|--vrrp] [-C|--check] [-l|--log-console] [-D|--log-detail] [-S|--log-facility={0-7}] [-V|--dont-release-vrrp] [-I|--dont-release-ipvs] [-R|--dont-respawn] [-n|--dont-fork] [-d|--dump-conf] [-p|--pid=FILE] [-r|--vrrp_pid=FILE] [-c|--checkers_pid=FILE] [-v|--version] [-h|--help] DESCRIPTION
Keepalived provides simple and robust facilities for load-balancing and high-availability. The load-balancing framework relies on well-known and widely used Linux Virtual Server (IPVS) kernel module providing Layer4 load-balancing. Keepalived implements a set of checkers to dynamically and adaptively maintain and manage load-balanced server pool according their health. Keepalived also implements the VRRPv2 protocol to achieve high-availability with director failover. OPTIONS
-f, --use-file=FILE Use the specified configuration file. The default configuration file is "/etc/keepalived/keepalived.conf". -P, --vrrp Only run the VRRP subsystem. This is useful for configurations that do not use IPVS load balancer. -C, --check Only run the healthcheck subsystem. This is useful for configurations that use the IPVS load balancer with a single director with no failover. -l, --log-console Log messages to the local console. The default behavior is to log messages to syslog. -D, --log-detail Detailed log messages. -S, --log-facility=[0-7] Set syslog facility to LOG_LOCAL[0-7]. The default syslog facility is LOG_DAEMON. -V, --dont-release-vrrp Don't remove VRRP VIPs and VROUTEs on daemon stop. The default behavior is to remove all VIPs and VROUTEs when keepalived exits -I, --dont-release-ipvs Don't remove IPVS topology on daemon stop. The default behavior it to remove all entries from the IPVS virtual server table on when keepalived exits. -R, --dont-respawn Don't respawn child processes. The default behavior is to restart the VRRP and checker processes if either process exits. -n, --dont-fork Don't fork the daemon process. This option will cause keepalived to run in the foreground. -d, --dump-conf Dump the configuration data. -p, --pid=FILE Use specified pidfile for parent keepalived process. The default pidfile for keepalived is "/var/run/keepalived.pid". -r, --vrrp_pid=FILE Use specified pidfile for VRRP child process. The default pidfile for the VRRP child process is "/var/run/keepalived_vrrp.pid". -c, --checkers_pid=FILE Use specified pidfile for checkers child process. The default pidfile for the checker child process is "/var/run/keepalived_checkers.pid". -v, --version Display the version and exit. -h, --help Display this help message and exit. SEE ALSO
keepalived.conf(5), ipvsadm(8) AUTHOR
This man page was written by Ryan O'Hara <rohara@redhat.com> November 2012 KEEPALIVED(8)
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