一.rsync server(172.16.3.226)

CentOS 7.2 X64

# yum install -y rsync

# mkdir -p -m 0700 /db/wal_archive

# chown -R postgres.postgres /db/wal_archive

可能存在的問題：

修改目錄/db/wal_archive權限後仍報錯如下：

rsync: mkstemp "/.000000010000000000000001.2Z6cX4" (in archive) failed: Permission denied (13)

解決辦法：請查詢 /etc/selinux/config的SELINUX配置項：

SELINUX=disabled

2.rsync server(172.16.3.226)

1).修改配置

# vi /etc/rsyncd.conf

[[email protected] wal_archive]# vi /etc/rsyncd.conf

# /etc/rsyncd: configuration file for rsync daemon mode

# See rsyncd.conf man page for more options.

# configuration example:

# uid = nobody

# gid = nobody

# use chroot = yes

# max connections = 4

# pid file = /var/run/rsyncd.pid

# exclude = lost+found/

# transfer logging = yes

# timeout = 900

# ignore nonreadable = yes

# dont compress = *.gz *.tgz *.zip *.z *.Z *.rpm *.deb *.bz2

# [ftp]

# path = /home/ftp

# comment = ftp export area

############# new add ##############

[archive]

# destination directory for copy

path = /db/wal_archive

# hosts you allow to access

hosts allow = 172.16.3.225

hosts deny = *

list = true

uid = postgres

gid = postgres

read only = false

[[email protected] wal_archive]#

2.啟動服務

# systemctl start rsyncd

# systemctl enable rsyncd

二、傳輸文件

rync client(172.16.3.225)

1.安裝軟件

# yum install -y rsync

2.建立數據庫歸檔目錄

# mkdir -p -m 0700 /db/wal_archive

# chown -R postgres.postgres /db/wal_archive

3.同步腳本配置

1小時以外的wal同步

sync_archives.sh

#!bin/sh

export PATH=/bin:$PATH

find /db/wal_archive -name ‘0000*‘ -type f -mmin 60 | xargs -I{} rsync -avz {} 172.16.3.226::archive

歸檔刪除腳本

兩天以外的wal刪除

del_archives.sh

#!bin/sh

export PATH=/bin:$PATH

find /db/wal_archive -name ‘0000*‘ -type f -mtime +2 - delete

# crontab -e

* * * * * /opt/cron/sync_archives.sh

0 1 * * * /opt/cron/del_archives.sh

三、數據庫歸檔配置

#------------------------------------------------------------------------------

# WRITE AHEAD LOG

#------------------------------------------------------------------------------

# - Settings -

#wal_level = replica # minimal, replica, or logical

# (change requires restart)

#fsync = on # flush data to disk for crash safety

# (turning this off can cause

# unrecoverable data corruption)

#synchronous_commit = on # synchronization level;

# off, local, remote_write, remote_apply, or on

#wal_sync_method = fsync # the default is the first option

# supported by the operating system:

# open_datasync

# fdatasync (default on Linux)

# fsync

# fsync_writethrough

# open_sync

#full_page_writes = on # recover from partial page writes

#wal_compression = off # enable compression of full-page writes

#wal_log_hints = off # also do full page writes of non-critical updates

# (change requires restart)

#wal_buffers = -1 # min 32kB, -1 sets based on shared_buffers

# (change requires restart)

#wal_writer_delay = 200ms # 1-10000 milliseconds

#wal_writer_flush_after = 1MB # measured in pages, 0 disables

#commit_delay = 0 # range 0-100000, in microseconds

#commit_siblings = 5 # range 1-1000

# - Checkpoints -

#checkpoint_timeout = 5min # range 30s-1d

#max_wal_size = 1GB

#min_wal_size = 80MB

checkpoint_completion_target = 0.9 # checkpoint target duration, 0.0 - 1.0

#checkpoint_flush_after = 256kB # measured in pages, 0 disables

#checkpoint_warning = 30s # 0 disables

# - Archiving -

archive_mode = on # enables archiving; off, on, or always

# (change requires restart)

archive_command = ‘cp -an %p > /db/wal_archive/%f‘ # command to use to archive a logfile segment

# placeholders: %p = path of file to archive

# %f = file name only

# e.g. ‘test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f‘

archive_timeout = 86400 # force a logfile segment switch after this

# number of seconds; 0 disables

#------------------------------------------------------------------------------

# REPLICATION

#------------------------------------------------------------------------------

# - Sending Server(s) -

# Set these on the master and on any standby that will send replication data.

max_wal_senders = 20 # max number of walsender processes

# (change requires restart)

wal_keep_segments = 1000 # in logfile segments, 16MB each; 0 disables

#wal_sender_timeout = 60s # in milliseconds; 0 disables

#max_replication_slots = 10 # max number of replication slots

# (change requires restart)

#track_commit_timestamp = off # collect timestamp of transaction commit

# (change requires restart)

本文出自 “yiyi” 博客，請務必保留此出處http://heyiyi.blog.51cto.com/205455/1929482

pg 10 wal 歸檔同步配置