failover and switchover in postgresql

Dear Community!

For example, I have two servers. First is the primary server and second is
the slave server. I need slave server  to become primary (temp) during
primary server is down. Then old primary was fixed. I need old primary
server is the primary server and then old slave server (new primary (temp))
to become slave server. Pls help me to explain how solve this problem.
Thanks!



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