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Titolo
How to configure more than one Master for redundancy or load balancing -
Descrizione
It is possible to have multiple Masters in UPM for either failover (redundancy) or load balancing. How can this be configured?
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Risoluzione
Follow the steps below to configure a second or multiple master:- Install and configure your first master (master1)
- Install the second master (master2) and copy configuration files pm.settings and pm.conf from master1 to master2
- For your pmrun/pmlocald agents amend the pm.settings file so that the masters entry is aware of both master1 and master2, eg
masters master1 master2 - Depending on whether you are then looking for load balancing or redundancy or a combination of both you can use further settings in the pm.settings on the pmrun/pmlocald agents.
Two optional settings allow this behaviour to be configured: - FailOverTimeout is followed by the number of seconds that pmrun will continue retrying each masterhost before it moves on. There is a one-second delay between retries on the same host, eg the following sets the retry to 10 seconds
FailOverTimeout 10 - SelectHostRandom followed by a "yes" will loadbalance the masterhost list in a random order each time and use this list as its connect order for masterhosts, eg
SelectHostRandom yes