pgpool_setup

Name

pgpool_setup --  Create a temporary installation of Pgpool-II cluster

Synopsis

pgpool_setup [option...]

Description

pgpool_setup creates a temporary installation of Pgpool-II cluster, which includes a Pgpool-II installation and specified number of PostgreSQL installations under current directory. Current directory must be empty before running pgpool_setup.

pgpool_setup is for testing purpose only and should not be used to create production installations.

pgpool_setup executes ssh against localhost. You need to configure ssh so that it can login to localhost without password.

Currently pgpool_setup supports streaming replication mode, native replication mode, raw mode, logical replication mode and snapshot isolation mode. To support watchdog, see watchdog_setup for details.

Options

pgpool_setup accepts the following command-line arguments:

-m mode

Specifies the running mode. mode can be r (native replication mode), s (streaming replication mode), n (raw mode), l (logical replication mode), y (slony mode) or i (snapshot isolation mode). If this is omitted, s is assumed.

-n num_clusters

Specifies the number of PostgreSQL installations. If this is omitted, 2 is used.

-p base_port

Specify the base port number used by Pgpool-II and PostgreSQL. Pgpool-II port is base_port. pcp port is base_port + 1. The first PostgreSQL node's port is base_port + 2, second PostgreSQL node's port is base_port + 3 and so on.

If -pg option is specified, the first PostgreSQL node's port is assigned to pg_base_port, the second PostgreSQL node's port is pg_base_port + 1 and so on.

If this is omitted, 11000 is used.

-pg pg_base_port

Specify the base port number used by PostgreSQL. The first PostgreSQL node's port is base_port + 2, second PostgreSQL node's port is base_port + 3 and so on.

If this is omitted, base_port+2 is used.

--no-stop

Do not stop pgpool and PostgreSQL after the work.

-d

Start pgpool with debug mode.

-s

In streaming replication mode, use replication slot instead of archive. Since the archive directory is shared by all PostgreSQL clusters, if a standby is promoted, the time line in the archive directory will be changed and other standby servers will be stopped. Using a replication slot does not have this problem and is always preferable if you can use PostgreSQL 9.4 or later, which supports replication slot. The replication slot name used by pgpool_setup is pgpool_setup_slot.

-r

Use pg_rewind command in recovery script (basebackup.sh). If the command fails, switch to use ordinal rsync command. In certain cases recovery using pg_rewind is much faster than rsync since it does not copy whole database cluster.

Environment variables

pgpool_setup recognizes following environment variables:

PGPOOL_INSTALL_DIR

Specifies the Pgpool-II installation directory. Pgpool-II binaries is expected to be placed under PGPOOL_INSTALL_DIR/bin and pgpool.conf and pool_hba.conf etc. are expected to be placed under PGPOOL_INSTALL_DIR/etc. The default is /usr/local.

PGPOOLDIR

Specifies the path to Pgpool-II configuration files. The default is PGPOOL_INSTALL_DIR/etc.

PGBIN

Specifies the path to PostgreSQL commands such as initdb, pg_ctl and psql. The default is /usr/local/pgsql/bin.

PGLIB

Specifies the path to PostgreSQL shared libraries. The default is /usr/local/pgsql/lib.

PGSOCKET_DIR

Specifies the path to Unix socket directory. The default is /tmp.

INITDBARG

Specifies the arguments for initdb command. The default is "--no-locale -E UTF_8".

USE_REPLICATION_SLOT

If "true", in streaming replication mode, use replication slot instead of archive. This brings the same effect as "-s" option is specified.

USE_PG_REWIND

If "true", in streaming replication mode, use pg_rewind in basebackup.sh script. This brings the same effect as "-r" option is specified.

Example

$ pgpool_setup 
PostgreSQL major version: 124
Starting set up in streaming replication mode
creating startall and shutdownall
creating failover script
creating database cluster /tmp/test/data0...done.
update postgresql.conf
creating pgpool_remote_start
creating basebackup.sh
creating recovery.conf
creating database cluster /tmp/test/data1...done.
update postgresql.conf
creating pgpool_remote_start
creating basebackup.sh
creating recovery.conf
temporarily start data0 cluster to create extensions
temporarily start pgpool-II to create standby nodes
 node_id | hostname | port  | status | lb_weight |  role   | select_cnt | load_balance_node | replication_delay | replication_state | replication_sync_state | last_status_change  
---------+----------+-------+--------+-----------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------
 0       | /tmp     | 11002 | up     | 0.500000  | primary | 0          | true              | 0                 |                   |                        | 2020-08-18 13:50:19
 1       | /tmp     | 11003 | down   | 0.500000  | standby | 0          | false             | 0                 |                   |                        | 2020-08-18 13:50:18
(2 rows)

recovery node 1...pcp_recovery_node -- Command Successful
done.
creating follow primary script
 node_id | hostname | port  | status | lb_weight |  role   | select_cnt | load_balance_node | replication_delay | replication_state | replication_sync_state | last_status_change  
---------+----------+-------+--------+-----------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------
 0       | /tmp     | 11002 | up     | 0.500000  | primary | 0          | true              | 0                 |                   |                        | 2020-08-18 13:50:19
 1       | /tmp     | 11003 | up     | 0.500000  | standby | 0          | false             | 0                 |                   |                        | 2020-08-18 13:50:23
(2 rows)

shutdown all

pgpool-II setting for streaming replication mode is done.
To start the whole system, use /tmp/test/startall.
To shutdown the whole system, use /tmp/test/shutdownall.
pcp command user name is "t-ishii", password is "t-ishii".
Each PostgreSQL, pgpool-II and pcp port is as follows:
#1 port is 11002
#2 port is 11003
pgpool port is 11000
pcp port is 11001
The info above is in README.port.
t-ishii$ ./startall 
waiting for server to start....5744 2020-08-18 13:50:27 JST LOG:  starting PostgreSQL 12.4 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0, 64-bit
5744 2020-08-18 13:50:27 JST LOG:  listening on IPv4 address "0.0.0.0", port 11002
5744 2020-08-18 13:50:27 JST LOG:  listening on IPv6 address "::", port 11002
5744 2020-08-18 13:50:27 JST LOG:  listening on Unix socket "/tmp/.s.PGSQL.11002"
5744 2020-08-18 13:50:27 JST LOG:  redirecting log output to logging collector process
5744 2020-08-18 13:50:27 JST HINT:  Future log output will appear in directory "log".
 done
server started
waiting for server to start....5757 2020-08-18 13:50:27 JST LOG:  starting PostgreSQL 12.4 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0, 64-bit
5757 2020-08-18 13:50:27 JST LOG:  listening on IPv4 address "0.0.0.0", port 11003
5757 2020-08-18 13:50:27 JST LOG:  listening on IPv6 address "::", port 11003
5757 2020-08-18 13:50:27 JST LOG:  listening on Unix socket "/tmp/.s.PGSQL.11003"
5757 2020-08-18 13:50:27 JST LOG:  redirecting log output to logging collector process
5757 2020-08-18 13:50:27 JST HINT:  Future log output will appear in directory "log".
 done
server started
t-ishii$ psql -p 11000 test
psql (12.4)
Type "help" for help.

test=# show pool_nodes;
 node_id | hostname | port  | status | lb_weight |  role   | select_cnt | load_balance_node | replication_delay | replication_state | replication_sync_state | last_status_change  
---------+----------+-------+--------+-----------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------
 0       | /tmp     | 11002 | up     | 0.500000  | primary | 0          | true              | 0                 |                   |                        | 2020-08-18 13:50:32
 1       | /tmp     | 11003 | up     | 0.500000  | standby | 0          | false             | 0                 | streaming         | async                  | 2020-08-18 13:50:32
(2 rows)