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pgpool2 + slony 1 in master/slave mode with no load balance and no select replication - slaves handle all reads

From: stanimir petrov <cristal_reaver(at)abv(dot)bg>
To: pgsql-general(at)postgresql(dot)org
Subject: pgpool2 + slony 1 in master/slave mode with no load balance and no select replication - slaves handle all reads
Date: 2010-06-30 09:52:11
Message-ID: 1499421023.246777.1277891531519.JavaMail.apache@mail72.abv.bg (view raw or flat)
Thread:
Lists: pgsql-general
 In my current configuration all queries are sent to the master, i want write queries to be sent to master, and reads to slave. I have 1 pgpool setuped with 2 postgres servers in master/slave replication with slony1
Can this be done with 1 pgpool or i must use 2 pgpools for writes and reads.

here is the pgconfig

#
# pgpool-II configuration file sample
# $Header: /cvsroot/pgpool/pgpool-II/pgpool.conf.sample,v 1.32 2010/01/31 02:22:24 t-ishii Exp $

# Host name or IP address to listen on: '*' for all, '' for no TCP/IP
# connections
listen_addresses = 'localhost'

# Port number for pgpool
port = 9999

# Port number for pgpool communication manager
pcp_port = 9898

# Unix domain socket path.
 (The Debian package defaults to
# /var/run/postgresql.)
socket_dir = '/tmp'

# Unix domain socket path for pgpool communication manager.
# (Debian package defaults to /var/run/postgresql)
pcp_socket_dir = '/tmp'

# Unix domain socket path for the backend. Debian package defaults to /var/run/postgresql!
backend_socket_dir = '/tmp'

# pgpool communication manager timeout. 0 means no timeout, but strongly not recommended!
pcp_timeout = 10

# number of pre-forked child process
num_init_children = 32

# Number of connection pools allowed for a child process
max_pool = 4

# If idle for this many seconds, child exits.
 0 means no timeout.
child_life_time = 300

# If idle for this many seconds, connection to PostgreSQL closes.
# 0 means no timeout.
connection_life_time = 0

# If child_max_connections connections were received, child exits.
# 0 means no exit.
child_max_connections = 0

# If client_idle_limit is n (n > 0), the client is forced to be
# disconnected whenever after n seconds idle (even inside an explicit
# transactions!)
# 0 means no disconnect.
client_idle_limit = 0

# Maximum time in seconds to complete client authentication.
# 0 means no timeout.
authentication_timeout = 60

# Logging directory
logdir = '/tmp'

# pid file name
pid_file_name = '/var/run/pgpool/pgpool.pid'

# Replication mode
replication_mode = false

# Load balancing mode, i.e., all SELECTs are load balanced.
# This is ignored if replication_mode is false.
load_balance_mode = false

# if there's a data mismatch between master and secondary
# start degeneration to stop replication mode
replication_stop_on_mismatch = false

# If true, replicate SELECT statement when load balancing is disabled.
# If false, it is only sent to the master node.
replicate_select = false

# Semicolon separated list of queries to be issued at the end of a
# session
reset_query_list = 'ABORT; DISCARD ALL'
# for 8.2 or older this should be as follows. 
#reset_query_list = 'ABORT; RESET ALL; SET SESSION AUTHORIZATION DEFAULT'

# If true print timestamp on each log line.
print_timestamp = true

# If true, operate in master/slave mode.
master_slave_mode = true

# If true, cache connection pool.
connection_cache = true

# Health check timeout.
 0 means no timeout.
health_check_timeout = 20

# Health check period.
 0 means no health check.
health_check_period = 10

# Health check user
health_check_user = 'postgres'

# Execute command by failover.
# special values:
 %d = node id
#
















 %h = host name
#
















 %p = port number
#
















 %D = database cluster path
#
















 %m = new master node id
#
















 %M = old master node id
#
















 %% = '%' character

failover_command = 'echo host:%h, new master id:%m, old master id:%M port number:%p > /tmp/failover.log'


# Execute command by failback.
# special values:
 %d = node id
#
















 %h = host name
#
















 %p = port number
#
















 %D = database cluster path
#
















 %m = new master node id
#
















 %M = old master node id
#
















 %% = '%' character
#
failback_command = 'echo host:%h, new master id:%m, old master id:%M port number:%p > /tmp/failback.log'

# If true, trigger fail over when writing to the backend communication
# socket fails. This is the same behavior of pgpool-II 2.2.x or
# earlier. If set to false, pgpool will report an error and disconnect
# the session.
fail_over_on_backend_error = true

# If true, automatically locks a table with INSERT statements to keep
# SERIAL data consistency.
 If the data does not have SERIAL data
# type, no lock will be issued. An /*INSERT LOCK*/ comment has the
# same effect.
 A /NO INSERT LOCK*/ comment disables the effect.
insert_lock = true

# If true, ignore leading white spaces of each query while pgpool judges
# whether the query is a SELECT so that it can be load balanced.
 This
# is useful for certain APIs such as DBI/DBD which is known to adding an
# extra leading white space.
ignore_leading_white_space = true

# If true, print all statements to the log.
 Like the log_statement option
# to PostgreSQL, this allows for observing queries without engaging in full
# debugging.
log_statement = false

# If true, print all statements to the log. Similar to log_statement except
# that prints DB node id and backend process id info.
log_per_node_statement = true

# If true, incoming connections will be printed to the log.
log_connections = false

# If true, hostname will be shown in ps status. Also shown in
# connection log if log_connections = true.
# Be warned that this feature will add overhead to look up hostname.
log_hostname = false

# if non 0, run in parallel query mode
parallel_mode = false

# if non 0, use query cache
enable_query_cache = false

#set pgpool2 hostname 
pgpool2_hostname = 'localhost'

# system DB info
#system_db_hostname = 'localhost'
#system_db_port = 5432
#system_db_dbname = 'pgpool'
#system_db_schema = 'pgpool_catalog'
#system_db_user = 'pgpool'
#system_db_password = ''

# backend_hostname, backend_port, backend_weight
# here are examples
backend_hostname0 = 'localhost'
backend_port0 = 5432
backend_weight0 = 1
backend_data_directory0 = '/usr/local/postgres-8.4/data/'
backend_hostname1 = 'localhost'
backend_port1 = 5434
backend_weight1 = 1
backend_data_directory1 = '/usr/local/postgres-8.4/data_replication/'

# - HBA -

# If true, use pool_hba.conf for client authentication. In pgpool-II
# 1.1, the default value is false. The default value will be true in
# 1.2.
enable_pool_hba = false

# - online recovery -
# online recovery user
recovery_user = 'nobody'

# online recovery password
recovery_password = ''

# execute a command in first stage.
recovery_1st_stage_command = ''

# execute a command in second stage.
recovery_2nd_stage_command = ''

# maximum time in seconds to wait for the recovering node's postmaster
# start-up. 0 means no wait.
# this is also used as a timer waiting for clients disconnected before
# starting 2nd stage
recovery_timeout = 90

# If client_idle_limit_in_recovery is n (n > 0), the client is forced
# to be disconnected whenever after n seconds idle (even inside an
# explicit transactions!)
 0 means no disconnect. This parameter only
# takes effect in recovery 2nd stage.
client_idle_limit_in_recovery = 0

# Specify table name to lock. This is used when rewriting lo_creat
# command in replication mode. The table must exist and has writable
# permission to public. If the table name is '', no rewriting occurs.
lobj_lock_table = ''

# If true, enable SSL support for both frontend and backend connections.
# note that you must also set ssl_key and ssl_cert for SSL to work in
# the frontend connections.
ssl = false
# path to the SSL private key file
#ssl_key = './server.key'
# path to the SSL public certificate file
#ssl_cert = './server.cert'

# If either ssl_ca_cert or ssl_ca_cert_dir is set, then certificate
# verification will be performed to establish the authenticity of the
# certificate.
 If neither is set to a nonempty string then no such
# verification takes place.
 ssl_ca_cert should be a path to a single
# PEM format file containing CA root certificate(s), whereas ssl_ca_cert_dir
# should be a directory containing such files.
 These are analagous to the
# -CAfile and -CApath options to openssl verify(1), respectively.
#ssl_ca_cert = ''
#ssl_ca_cert_dir = ''


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