os: ubuntu 16.04
db: postgresql 9.6.8
pgpool: pgpool-II-3.7.7

pcp_detach_node

$ /usr/pgpool-3.7.7/bin/pcp_detach_node -n 1 -U pgpool
Password: 
pcp_detach_node -- Command Successful

pcp_attach_node

$ /usr/pgpool-3.7.7/bin/pcp_attach_node -v -n 1 -U pgpool
Password: 
pcp_attach_node -- Command Successful
 

pcp_node_count

$ /usr/pgpool-3.7.7/bin/pcp_node_count -U pgpool
Password: 
2

pcp_node_info

$ /usr/pgpool-3.7.7/bin/pcp_node_info -n 0 -U pgpool
Password: 
192.168.56.92 5432 1 0.500000 waiting primary

$ /usr/pgpool-3.7.7/bin/pcp_node_info -n 1 -U pgpool
Password: 
192.168.56.90 5432 1 0.500000 waiting standby

pcp_pool_status

$ /usr/pgpool-3.7.7/bin/pcp_pool_status -U pgpool
Password: 
name : listen_addresses
value: *
desc : host name(s) or IP address(es) to listen on

name : heartbeat_destination_port0
value: 9694
desc : destination port for sending heartbeat using NIC device 0

pcp_proc_count

$ /usr/pgpool-3.7.7/bin/pcp_proc_count -U pgpool
Password: 
8658 8659 8660 8661 8662 8663 8664 8665 8666 8667 8668 8669 8670 8671 8672 8673 8674 8675 8676 8677 8678 8679 8680 8681 8682 8683 8684 8685 8686 8687 8691 8692

 

pcp_proc_info

$ /usr/pgpool-3.7.7/bin/pcp_proc_info -U pgpool
Password: 
No process information available

pcp_stop_pgpool

$ /usr/pgpool-3.7.7/bin/pcp_stop_pgpool -U pgpool
Password: 
pcp_stop_pgpool -- Command Successful

pcp_watchdog_info

$ /usr/pgpool-3.7.7/bin/pcp_watchdog_info -U pgpool
Password: 
2 YES 192.168.56.92:9999 Linux xxoo 192.168.56.92

192.168.56.92:9999 Linux xxoo 192.168.56.92 9999 9000 4 MASTER
192.168.56.90:9999 Linux xxoo 192.168.56.90 9999 9000 7 STANDBY

參考:
http://www.pgpool.net/mediawiki/index.php/Downloads
http://www.pgpool.net/docs/latest/en/html/index.html