189 8069 5689
一.rsync server(172.16.3.226)
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CentOS 7.2 X64
# yum install -y rsync
# mkdir -p -m 0700 /db/wal_archive
# chown -R postgres.postgres /db/wal_archive
可能存在的问题：
修改目录/db/wal_archive权限后仍报错如下：
rsync: mkstemp "/.000000010000000000000001.2Z6cX4" (in archive) failed: Permission denied (13)
解决办法：请查询 /etc/selinux/config的SELINUX配置项：
SELINUX=disabled
2.rsync server(172.16.3.226)
1).修改配置
# vi /etc/rsyncd.conf
[root@localhost 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
[postgres@localhost wal_archive]#
2.启动服务
# systemctl start rsyncd
# systemctl enable rsyncd
二、传输文件
rync client(172.16.3.225)
1.安装软件
# yum install -y rsync
2.建立数据库归档目录
# mkdir -p -m 0700 /db/wal_archive
# chown -R postgres.postgres /db/wal_archive
3.同步脚本配置
1小时以外的wal同步
sync_archives.sh
#!bin/sh
export PATH=/bin:$PATH
find /db/wal_archive -name '0000*' -type f -mmin 60 | xargs -I{} rsync -avz {} 172.16.3.226::archive
归档删除脚本
两天以外的wal删除
del_archives.sh
#!bin/sh
export PATH=/bin:$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、数据库归档配置
#------------------------------------------------------------------------------
# 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)