If an invoked script must access servers, it needs credentials.
When invoked, a script can now be provided with the monitor
credentials of MaxScale using the variable CREDENTIALS.
It will be expanded like
user:password@[...]:N1,user:password@[...]:N2
for every server the monitor in question is monitoring. That is,
irrespective of whether it is a master or a slave, running or not.
Thus, a failover script could be specified like:
[MyMonitor]
type=monitor
module=mysqlmon
...
script=.../failover.sh --credentials=$CREDENTIALS --slaves=$SLAVELIST
events=master_down
Note, it may make sense to introduce specific failover (and switchover)
keywords, but with the above addition it is possible to start
experimenting with failover scripts.
56b947b27d