Question

我阅读了几篇关于postgresql归档恢复和清理的文档，但我的postgresql服务器仍然没有清除归档，或者我真的不了解它是如何工作的。

简单地说，我为WAL归档清理编写了一个shell脚本。当我从命令行运行脚本时，它可以工作并清除我的存档（我只保留存档超过三天）。我的脚本名为 pg_archive_cleanup ，可执行并放在此处： / usr / sbin /

我像这样配置 /etc/postgresql/9.3/main/recovery.conf ：

# -------------------------------
# PostgreSQL recovery config file
# -------------------------------
#
# Edit this file to provide the parameters that PostgreSQL needs to
# perform an archive recovery of a database, or to act as a replication
# standby.
#
# If "recovery.conf" is present in the PostgreSQL data directory, it is
# read on postmaster startup.  After successful recovery, it is renamed
# to "recovery.done" to ensure that we do not accidentally re-enter
# archive recovery or standby mode.
#
# This file consists of lines of the form:
#
#   name = value
#
# Comments are introduced with '#'.
#
# The complete list of option names and allowed values can be found
# in the PostgreSQL documentation.
#
#---------------------------------------------------------------------------
# ARCHIVE RECOVERY PARAMETERS
#---------------------------------------------------------------------------
# archive_cleanup_command
#
# specifies an optional shell command to execute at every restartpoint.
# This can be useful for cleaning up the archive of a standby server.
#
archive_cleanup_command = '/usr/sbin/pg_archive_cleanup'
#
#---------------------------------------------------------------------------
# RECOVERY TARGET PARAMETERS
#---------------------------------------------------------------------------
#
# By default, recovery will rollforward to the end of the WAL log.
# If you want to stop rollforward at a specific point, you
# must set a recovery target.
#
# You may set a recovery target either by transactionId, by name,
# or by timestamp. Recovery may either include or exclude the
# transaction(s) with the recovery target value (ie, stop either
# just after or just before the given target, respectively).
#
#
#recovery_target_name = ''      # e.g. 'daily backup 2011-01-26'
#
#recovery_target_time = ''      # e.g. '2004-07-14 22:39:00 EST'
#
#recovery_target_xid = ''
#
#recovery_target_inclusive = true
#
#
# If you want to recover into a timeline other than the "main line" shown in
# pg_control, specify the timeline number here, or write 'latest' to get
# the latest branch for which there's a history file.
#
#recovery_target_timeline = 'latest'
#
#
# If pause_at_recovery_target is enabled, recovery will pause when
# the recovery target is reached. The pause state will continue until
# pg_xlog_replay_resume() is called. This setting has no effect if
# hot standby is not enabled, or if no recovery target is set.
#
#pause_at_recovery_target = true
#
#---------------------------------------------------------------------------
# STANDBY SERVER PARAMETERS
#---------------------------------------------------------------------------
#
# standby_mode
#
# When standby_mode is enabled, the PostgreSQL server will work as a
# standby. It will continuously wait for the additional XLOG records, using
# restore_command and/or primary_conninfo.
#
standby_mode = on
restore_command = 'cp /var/lib/postgresql/database/archive/%f "%p"'
#
# primary_conninfo
#
# If set, the PostgreSQL server will try to connect to the primary using this
# connection string and receive XLOG records continuously.
#
primary_conninfo = 'host=db-master port=5432 user=repli password=Esibfegiav4'           # e.g. 'host=localhost port=5432'
#
#
# By default, a standby server keeps restoring XLOG records from the
# primary indefinitely. If you want to stop the standby mode, finish recovery
# and open the system in read/write mode, specify path to a trigger file.
# The server will poll the trigger file path periodically and start as a
# primary server when it's found.
#
trigger_file = '/var/lib/postgresql/database/failover_trigger'
#
#---------------------------------------------------------------------------
# HOT STANDBY PARAMETERS
#---------------------------------------------------------------------------
#
# Hot Standby related parameters are listed in postgresql.conf
#
#---------------------------------------------------------------------------

你可以看到

行

archive_cleanup_command = '/usr/sbin/pg_archive_cleanup'

我的清理脚本：

#!/bin/bash

ARCHIVEDIR='/var/lib/postgresql/database/archive'
CHECKPOINT=$(find $ARCHIVEDIR -type f -mtime +3 -type f -printf '%f\n' | sort -r | head -1)
cd $ARCHIVEDIR
/usr/bin/pg_archivecleanup $ARCHIVEDIR $CHECKPOINT

find $ARCHIVEDIR -type f -mtime +3 -a -type f -a ! -newer $CHECKPOINT -delete

但是4天后磁盘空间增长了。我在文档中看到，在 check_point 和 restart_point 中读取 recovery.conf 文件... 所以我想知道为什么档案不会自动清除？我在哪里设置发生？什么时候postgresl应该进行清洗？我想每天都这样，我不得不把我的清理脚本放在crontab中吗？或者别的地方？而且我的postgresql日志文件中也没有任何痕迹。清理日志写在哪里？

感谢您的回复。

Answer 1

pg_archivecleanup带参数：

$ /usr/pgsql-9.4/bin/pg_archivecleanup 
pg_archivecleanup: must specify archive location
Try "pg_archivecleanup --help" for more information.

如果查看副本上的日志，您可能会看到来自pg_archivecleanup的重复帮助消息。

the manual显示archive_cleanup_command替换了最后一个有效重启点%r，并显示了示例配置：

archive_cleanup_command = 'pg_archivecleanup /mnt/server/archivedir %r'

Answer 2

我解决了这个问题。

我的脚本和配置都很好。我刚刚没有重新启动 postgresql 服务，以考虑我的修改而重新启动新点。

我确实重新启动了servicec，它现在正常运行。

谢谢@Craig

Postgresql自动存档清除未发生

2 个答案: