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pgbouncer
Langue: en
Version: 08/08/2008 (fedora - 06/07/09)
Section: 5 (Format de fichier)
Sommaire
NAME
pgbouncer - Lightweight connection pooler for PostgreSQL.SYNOPSIS
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[databases] db = ...
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[pgbouncer] ...
DESCRIPTION
Config file is in "ini" format. Section names are between " and ". Lines starting with ";" or "" are taken as comment and ignored. The characters ";" and "" are not recognized when they appear later in the line.SECTION [PGBOUNCER]
Generic settings
logfile
- Specifies log file. Log file is kept open so after rotation kill -HUP or on console RELOAD; should be done.
Default: not set.
pidfile
- Specifies pid file. Without pidfile, the daemonization is not allowed.
Default: not set.
listen_addr
- Specifies IPv4 address, where to listen for TCP connections. Or * meaning "listen on all addresses". When not set, only unix socket connections are allowed.
Default: not set
listen_port
- On which port to listen on. Applies to both TCP and Unix sockets.
Default: 6000
unix_socket_dir
- Specifies location for Unix sockets. Applies to both listening socket and server connections. If set to empty string, Unix sockets are disabled.
Default: /tmp
user
- If set, specifies UNIX user to change to. Work only if started as root or user is same as current user.
Default: not set
auth_file
- Load user names and passwords from this file. File format used is same as for PostgreSQL pg_auth/pg_pwd file, so can be pointed directly to backend file.
Default: not set.
auth_type
- How to authenticate users.
md5 -
- Use MD5-based password check. auth_file may contain both md5-encrypted or plain-text passwords. Default.
crypt
- Use crypt(3) based bassword check. auth_file must contain plain-text passwords.
plain
- Clear-text password is sent over wire.
trust
- No authentication is done. Username must still exists in auth_file.
any
- Like trust but username given is ignored. Requires that all databases have configured to log in as specific user.
pool_mode
- Specifies when server connection is tagged as reusable for other clients.
session -
- Server is released back to pool after client disconnects. Default.
transaction
- Server is released back to pool after transaction finishes.
statement
- Server is released back to pool after query finishes. Long transactions spanning multiple statements are disallowed in this mode.
max_client_conn
- Maximum number of client connections allowed. When increased then the file descriptor limits should also be increased. Note that actual number of file descriptiors used is more that max_client_conn. Theoretical maximum used is:
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max_client_conn + (max_pool_size * total_databases * total_users)
if each user connects under it's own username to server. If database user is specified in connect string (all users connect under same username), the theoretical maximum is:
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max_client_conn + (max_pool_size * total_databases)
The theoretical maximum should be never reached, unless somebody deliberately crafts special load for it. Still, it means you should give fds liberately.
Search for ulimit in your favourite shell man page.
Default: 100
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default_pool_size
- How many server connection to allow per user/database pair. Can be overrided in per-database config.
Default: 20
server_round_robin
- By default, pgbouncer reuses server connections in LIFO manner, so that few connections get the most load. This gives best performance if you have single server serving a database. But if there is TCP round-robin behind a database IP then it's better if pgbouncer also uses connections in that manner, thus achieving uniform load.
Default: 0
ignore_startup_parameters
- By default, PgBouncer allows only parameters it can keep track of in startup packets - client_encoding, datestyle, timezone and standard_conforming_strings.
All others raise error. To allow others too, they can be specified here, so that pgbouncer knows that they are handled by admin and it can ignore them.
Default: empty
Log settings
syslog
- Toggles syslog on/off
Default: 0
syslog_facility
- Under what facility to send log to syslog. Possibilities: auth, authpriv, daemon, user, local0-7
Default: daemon
log_connections
- Log successful logins.
Default: 1
log_disconnections
- Log disconnections with reasons.
Default: 1
log_pooler_errors
- Log error messaged pooler sends to clients.
Default: 1
Console access control
admin_users
- Comma-separted list of database users that are allowed to connect and run all commands on console.
Default: empty
stats_users
- Comma-separated list of database users that are allowed to connect and run read-only queries on console. Thats means all SHOW commands except SHOW FDS.
Default: empty.
Connection sanity checks, timeouts
server_reset_query
- Query send to server on connection release, before making it available to other clients. At that moment no transaction is in progress so it should not include ABORT or ROLLBACK.
Good choice for 8.2 and below is:
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server_reset_query = RESET ALL; SET SESSION AUTHORIZATION DEFAULT;
for 8.3 and above its enough to do:
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server_reset_query = DISCARD ALL;
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server_check_delay
- How long to keep released immidiately available, without running sanity-check query on it. If 0 then the query is ran always.
Default: 30
server_check_query
- Simple do-nothing query to check if server connection is alive.
If empty string, then sanity checking is disabled.
Default: SELECT 1;
server_lifetime
- Pooler tries to close server connections that are been connected longer than this. Setting it to 0 means the connection is to be used only once, then closed.
Default: 3600
server_idle_timeout
- If server connection has been idle more than this then there's too many connections in the pool and this one can be dropped.
Default: 600
server_connect_timeout
- If connection and login wont finish in this time, the connection will be closed.
Default: 15
server_login_retry
- If login failed, because of failure from connect() or authentication that pooler waits this much before retrying to connect.
Default: 15
client_login_timeout
- If client connect but does not manage to login in this time, it will be disconnected. Mainly needed to avoid dead connections stalling SUSPEND and thus online restart.
Default: 60
Dangerous timeouts
Setting following timeouts cause unexcpected errors.
query_timeout
- Queries running longer than that are canceled. This should be used only with slightly smaller server-side statement_timeout, to apply only for network problems.
Default: 0 (disabled)
client_idle_timeout
- Client connections idling longer than that are closed. This should be larger then client-side connection lifetime settings, to apply only for network problems.
Default: 0 (disabled)
Low-level network settings
pkt_buf
- Internal buffer size for packets. Affects size of TCP packets sent and general memory usage. Actual libpq packets can be larger than this so no need to set it large.
Default: 2048
tcp_defer_accept
- Details about following options shouldbe looked from man 7 tcp
Default: 45 on Linux, otherwise 0
tcp_socket_buffer
- Default: not set
tcp_keepalive
- Default: Not set
tcp_keepcnt
- Default: not set
tcp_keepidle
- Default: not set
tcp_keepintvl
- Default: not set
SECTION [DATABASES]
This contains key=value pairs where key will be taken as database name and value as libpq-connstring style list of key=value pairs. As actual libpq is not used, so not all features from libpq can be used (service=, quoting).Location parameters
dbname
- Destination database name.
Default: same as client-side database name.
host
- IP-address to connect to.
Default: not set, meaning to use unix-socket.
port
- Default: 5432
user, password
- If user= is set, all connections to destination database will be done with that user, meaning that there will be only one pool for this database.
Otherwise pgbouncer tries to log into destination database with client username, meaning that there will be one pool per user.
Pool configuration
pool_size
- Set maximum size of pools for this database. If not set, the default_pool_size is used.
connect_query
- Query to be executed after connecttion is established, but before taking the connection into use by clients. If the query raises errors, they are logged but ignored otherwise.
Extra parameters
They allow setting default parameters on server connection.Note that since version 1.1 PgBouncer tracks client changes for their values, so their use in pgbouncer.ini is deprecated now.
client_encoding
- Ask specific client_encoding from server.
datestyle
- Ask specific datestyle from server.
timezone
- Ask specific timezone from server.
AUTHENTICATION FILE FORMAT
PgBouncer needs its own user database. The users are loaded from text file that should be in same format as PostgreSQL's pg_auth/pg_pwd file.-
"username1" "password" ... "username2" "md5abcdef012342345" ...
There shoud be at least 2 fields, surrounded by double quotes. First is username and second either plain-text or md5-hashed password. PgBouncer ignores rest of the line.
Such file format allows to direct PgBouncer directly to PostgreSQL user file under data directory.
EXAMPLE
Minimal config
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[databases] template1 = host=127.0.0.1 dbname=template1
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[pgbouncer] pool_mode = session listen_port = 6543 listen_addr = 127.0.0.1 auth_type = md5 auth_file = users.txt logfile = pgbouncer.log pidfile = pgbouncer.pid admin_users = someuser stats_users = stat_collector
Database defaults
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[databases]
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; foodb over unix socket foodb =
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; redirect bardb to bazdb on localhost bardb = host=127.0.0.1 dbname=bazdb
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; acceess to dest database will go with single user forcedb = host=127.0.0.1 port=300 user=baz password=foo client_encoding=UNICODE datestyle=ISO
SEE ALSO
pgbouncer(1) - manpage for general usage, console commands.https://developer.skype.com/SkypeGarage/DbProjects/PgBouncer
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre