I had connected the salt master (10.1.x.x) to salt minion (10.2.x.x). Now I have changed the salt master(131.x.x.x) for existing salt minion and also I have changed the public key of new salt master in place /etc/salt/pki/minion. But the salt master still tring to connect old master . I checked in minion configuration file , no ip was configured for saltmaster. Can anyone tell me how did the salt-minion picks salt-master ip?
Salt minions will by default try to connect to a hostname called salt. If no IP is specified, and if minion is able to resolve salt, it will attempt to join that master.
It's possible that the hostname salt is pointing to old master's IP address. Something simple like ping salt from minion should be able to reveal some clues.
If it is indeed pointing to 10.1.x.x, then you have to change the DNS entry or etc/hosts entry to point to the new IP 131.x.x.x.