postgresql 高可用 etcd + patroni 之五 command

os: centos 7.4
postgresql: 9.6.9
etcd: 3.2.18
patroni: 1.4.4

记录一下 etcd、patroni的一些命令，当个手记。

etcd 的一些操作命令

# systemctl status etcd.service 
# systemctl start etcd.service 
# systemctl enable etcd.service 

$ etcdctl cluster-health
$ etcdctl ls
$ etcdctl ls /pgsql/pgsql96/
$ etcdctl ls --recursive --sort -p

$ etcdctl get /pgsql/pgsql96/members/pgsql96_node1
$ etcdctl get /pgsql/pgsql96/initialize
$ etcdctl get /pgsql/pgsql96/leader
$ etcdctl get /pgsql/pgsql96/config

$ etcdctl rm --recursive /pgsql

$ etcdctl --help
NAME:
   etcdctl - A simple command line client for etcd.
USAGE:
   etcdctl [global options] command [command options] [arguments...]
VERSION:
   2.2.5
AUTHOR:
  Author - <unknown@email>

COMMANDS:
   backup		backup an etcd directory
   cluster-health	check the health of the etcd cluster
   mk			make a new key with a given value
   mkdir		make a new directory
   rm			remove a key or a directory
   rmdir		removes the key if it is an empty directory or a key-value pair
   get			retrieve the value of a key
   ls			retrieve a directory
   set			set the value of a key
   setdir		create a new or existing directory
   update		update an existing key with a given value
   updatedir		update an existing directory
   watch		watch a key for changes
   exec-watch		watch a key for changes and exec an executable
   member		member add, remove and list subcommands
   import		import a snapshot to a cluster
   user			user add, grant and revoke subcommands
   role			role add, grant and revoke subcommands
   auth			overall auth controls
   help, h		Shows a list of commands or help for one command
   
GLOBAL OPTIONS:
   --debug			output cURL commands which can be used to reproduce the request
   --no-sync			don't synchronize cluster information before sending request
   --output, -o "simple"	output response in the given format (`simple`, `extended` or `json`)
   --discovery-srv, -D 		domain name to query for SRV records describing cluster endpoints
   --peers, -C 			a comma-delimited list of machine addresses in the cluster (default: "http://127.0.0.1:4001,http://127.0.0.1:2379")
   --endpoint 			a comma-delimited list of machine addresses in the cluster (default: "http://127.0.0.1:4001,http://127.0.0.1:2379")
   --cert-file 			identify HTTPS client using this SSL certificate file
   --key-file 			identify HTTPS client using this SSL key file
   --ca-file 			verify certificates of HTTPS-enabled servers using this CA bundle
   --username, -u 		provide username[:password] and prompt if password is not supplied.
   --timeout "1s"		connection timeout per request
   --total-timeout "5s"		timeout for the command execution (except watch)
   --help, -h			show help
   --version, -v		print the version

patroni 的一些操作命令

$ patroni /usr/patroni/conf/patroni_postgresql.yml

$ curl http://127.0.0.1:8008

$ patronictl -c /usr/patroni/conf/patroni_postgresql.yml list
$ patronictl -c /usr/patroni/conf/patroni_postgresql.yml list pgsql96
$ patronictl -c /usr/patroni/conf/patroni_postgresql.yml show-config pgsql96

$ patronictl -c /usr/patroni/conf/patroni_postgresql.yml edit-config pgsql96

$ patronictl -c /usr/patroni/conf/patroni_postgresql.yml restart pgsql96 pgsql96_node1

$ patronictl -c /usr/patroni/conf/patroni_postgresql.yml switchover pgsql96

$ patronictl -c /usr/patroni/conf/patroni_postgresql.yml reinit pgsql96 pgsql96_node1

$ patronictl --help
Usage: patronictl [OPTIONS] COMMAND [ARGS]...

Options:
  -c, --config-file TEXT  Configuration file
  -d, --dcs TEXT          Use this DCS
  -k, --insecure          Allow connections to SSL sites without certs
  --help                  Show this message and exit.

Commands:
  configure    Create configuration file
  dsn          Generate a dsn for the provided member, defaults to a dsn of...
  edit-config  Edit cluster configuration
  failover     Failover to a replica
  flush        Flush scheduled events
  list         List the Patroni members for a given Patroni
  pause        Disable auto failover
  query        Query a Patroni PostgreSQL member
  reinit       Reinitialize cluster member
  reload       Reload cluster member configuration
  remove       Remove cluster from DCS
  restart      Restart cluster member
  resume       Resume auto failover
  scaffold     Create a structure for the cluster in DCS
  show-config  Show cluster configuration
  switchover   Switchover to a replica
  version      Output version of patronictl command or a running Patroni...

max_connections,
max_locks_per_transaction,
wal_level,
max_wal_senders,
max_prepared_transactions,
max_replication_slots,
max_worker_processes

this parameter can not be redefined locally

参考：
https://github.com/zalando/patroni
https://patroni.readthedocs.io/en/latest/
https://patroni.readthedocs.io/en/latest/ENVIRONMENT.html

https://github.com/zalando/patroni/blob/master/docs/replication_modes.rst
https://postgresconf.org/system/events/document/000/000/228/Patroni_tutorial_4x3-2.pdf