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postgresql|数据库|基于本地备份的远程备份策略

晚风_END 2024-09-26 12:01:19
简介postgresql|数据库|基于本地备份的远程备份策略

前言:

  • 数据库的安全性需要做一个保证,那么,本地备份策略显然是不太安全的,如果,本地磁盘有突发损坏问题,将无法恢复数据库。

    因此,远程备份也就是把备份文件拷贝到远端服务器是一个必要的措施。

  • 远程备份策略的几种方案对比

远程备份的具体实现我们可以使用的工具是比较多的,其中比较高效的是再生龙,scp,rsync以及pg_dump命令远程连接数据库备份。

那么,这几种工具到底使用哪个比较好呢?

  1. 1,再生龙的配置比较复杂,对系统的侵入比较多,因此,这个工具并不适用于我们的场景。
  2. 2,Scp命令需要配置服务器免密或者明文使用服务器的密码,对服务器的安全是有一定损害的,因此,scp也不太适用于我们的场景。,
  3. 3,Pg_dump命令同样需要postgresql数据库的特权账号和密码,基本是明文形式,对服务器的安全也是有一定的损害,因此,pg_dump也是不太适用的,并且,网络直连数据库也是对磁盘有一定的损害。
  4. 4,Rsync远程备份

Rsync作为一个专业的数据同步软件,支持增量同步,因此,该工具是十分适合远程备份的,该工具具有配置简单,安全性有保证(可设置密码),备份效率高的特点。

一,

数据库的远程备份的实现案例

计划使用两台服务器,一台服务器安装了postgresql,该服务器的IP地址为192.168.123.60,在远备中的角色为客户端,推送数据的

该服务器只备份了单库test3:

postgres=# l+
                                                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    | Access privileges |   Size   | Tablespace |                Description                 
-----------+----------+----------+-------------+-------------+-------------------+----------+------------+--------------------------------------------
 postgres  | pg1      | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 10001 kB | pg_default | default administrative connection database
 template0 | pg1      | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/pg1           +| 7809 kB  | pg_default | unmodifiable empty database
           |          |          |             |             | pg1=CTc/pg1       |          |            | 
 template1 | pg1      | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/pg1           +| 7809 kB  | pg_default | default template for new databases
           |          |          |             |             | pg1=CTc/pg1       |          |            | 
 test      | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 7817 kB  | mytbs      | 
 test2     | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 7809 kB  | pg_default | 
 test3     | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 7817 kB  | pg_default | 
(6 rows)

postgres=# dt
        List of relations
 Schema | Name | Type  |  Owner   
--------+------+-------+----------
 public | ssss | table | postgres
(1 row)

 备份的单库文件为test3.dump文件:

[pg1@EULER1 ~]$ pg_dump -Upostgres -d test3 -Fc -f test3.dump
[pg1@EULER1 ~]$ pg_restore -l test3.dump 
;
; Archive created at 2023-06-10 10:51:53 CST
;     dbname: test3
;     TOC Entries: 7
;     Compression: -1
;     Dump Version: 1.14-0
;     Format: CUSTOM
;     Integer: 4 bytes
;     Offset: 8 bytes
;     Dumped from database version: 12.5
;     Dumped by pg_dump version: 12.5
;
;
; Selected TOC Entries:
;
202; 1259 49157 TABLE public test3 postgres
3086; 0 49157 TABLE DATA public test3 postgres
2959; 2606 49161 CONSTRAINT public test3 test3_pkey postgres

另一台服务器只安装了rsync,该服务器的ip地址为192.168.123.61,在远备中的角色为服务器,接受数据的,也就是说60服务器上的本地备份文件以及物理文件推送到该服务器上进行保存,从而达到远备的目的。

二,

Rsync远程备份的实现步骤

1,

在61上执行以下,安装接收备份文件的rsync服务端:

安装rsync,如果是最小化安装,通常没有rsync,需要yum安装, yum install rsync -y

2,

编辑 /etc/sysconfig/rsyncd ,内容如下:

OPTIONS="/etc/rsyncd.conf"

3,

编辑/etc/rsyncd.conf,内容如下:

uid = root
gid = root
port = 11873
use chroot = yes
max connections = 4
hosts allow = *
pid file = /var/run/rsyncd.pid
log file = /var/log/rsyncd/rsyncd.log
lock file =/var/run/rsync.lock
exclude = lost+found/
transfer logging = yes
timeout = 900
ignore nonreadable = yes
dont compress   = *.gz *.tgz *.zip *.z *.Z *.rpm *.deb *.bz2
[pgsql_danku]
       path = /data/pgsql_danku
       comment = pgsql danku
        read only = no
        auth users = rsync
        secrets file = /etc/rsyncd.passwd
[pgsql_all]
path = /data/pgsql_all
       comment = pgsql all
        read only = no
        auth users = rsync
        secrets file = /etc/rsyncd.passwd

4. 日志文件的生成

mkdir -p /var/log/rsyncd/  && touch /var/log/rsyncd/rsyncd.log && chmod 755 /var/log/rsyncd/rsyncd.log

5.根据  /etc/rsyncd.conf这个配置文件,生成账号和密码保存文件

vim /etc/rsyncd.passwd    #文件内容如下:

rsync:你要设定的密码,客户端60使用的。

6. 设定账号密码文件权限为600


chmod 600 /etc/rsyncd.passwd

7.根据 /etc/rsyncd.conf 这个配置文件,生成存放同步及备份文件或目录的目录

[root@centos61 ~]# mkdir -p /data/pgsql_danku
[root@centos61 ~]# mkdir -p /data/pgsql_all

8.启动服务并加入开机启动,查看服务状态

systemctl enable rsyncd && systemctl start rsyncd && systemctl status rsyncd

在60服务器,也就是存放备份文件test3.dump的服务器执行推送:

vim /etc/rsync.passwd

密码,和服务器端设定的密码一致,只写密码什么都不写

chmod 600 /etc/rsync.passwd

编写推送脚本(按实际情况填写):

#!/bin/bash
#!auther zsk
rsync -avz --port=11873 /home/pg1/test3.dump  rsync@192.168.123.61::pgsql_danku --password-file=/etc/rsync.passwd

执行此推送脚本,大体输出如下:

[root@EULER1 ~]# bash rsync_pgsql.sh 
sending incremental file list
./
.bash_history
.bash_logout
.bash_profile
.bashrc
.psql_history
.viminfo
logfile
test3.dump

sent 7,808 bytes  received 170 bytes  15,956.00 bytes/sec
total size is 50,944  speedup is 6.39

####注:服务端的配置文件空格回车等等不能使用Windows的,否则会报错:

[root@EULER1 ~]# bash rsync_pgsql.sh 
@ERROR: no path setting.
rsync error: error starting client-server protocol (code 5) at main.c(1648) [sender=3.1.2]

查看rsyncd这个服务的日志:

2023/06/10 11:05:55 [2964] No path specified for module pgsql_danku
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "dont compress   "
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "dont compress   "
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "       path"
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "       path"
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "       comment"
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "       comment"
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "        read only"
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "        read only"
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "        auth users"
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "        auth users"
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "        secrets file"
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "        secrets file"
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "       comment"
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "       comment"
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "        read only"
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "        read only"
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "        auth users"
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "        auth users"
2023/06/10 11:06:59 [2967] Unknown Parameter encountered: "        secrets file"
2023/06/10 11:06:59 [2967] IGNORING unknown parameter "        secrets file"
2023/06/10 11:06:59 [2967] name lookup failed for 192.168.123.60: Name or service not known
2023/06/10 11:06:59 [2967] connect from UNKNOWN (192.168.123.60)
2023/06/10 11:06:59 [2967] No path specified for module pgsql_danku
2023/06/10 11:10:22 [2958] sent 0 bytes  received 0 bytes  total size 0
2023/06/10 11:10:22 [2984] rsyncd version 3.0.9 starting, listening on port 11873
2023/06/10 11:10:26 [2985] Unknown Parameter encountered: "        read only"
2023/06/10 11:10:26 [2985] IGNORING unknown parameter "        read only"
2023/06/10 11:10:26 [2985] Unknown Parameter encountered: "        auth users"
2023/06/10 11:10:26 [2985] IGNORING unknown parameter "        auth users"
2023/06/10 11:10:26 [2985] Unknown Parameter encountered: "        secrets file"
2023/06/10 11:10:26 [2985] IGNORING unknown parameter "        secrets file"

因此,在61服务器上,重新打/etc/rsyncd.conf的空格,然后重启rsyncd服务即可恢复正常。




60服务器的物理文件在/usr/local/pgsql/data 这个路径下

[root@EULER1 ~]# ps aux |grep postgres
root       3241  0.0  0.0 112724   992 pts/0    S+   11:31   0:00 grep --color=auto postgres
pg1       79417  0.0  1.0 317636 41804 ?        Ss   10:53   0:00 /usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data
pg1       79418  0.0  0.0 126996   704 ?        Ss   10:53   0:00 postgres: logger   
pg1       79420  0.0  0.0 318028  3040 ?        Ss   10:53   0:00 postgres: checkpointer   
pg1       79421  0.0  0.0 317896  2336 ?        Ss   10:53   0:00 postgres: background writer   
pg1       79422  0.0  0.1 317636  4740 ?        Ss   10:53   0:00 postgres: walwriter   
pg1       79423  0.0  0.0 318912  1800 ?        Ss   10:53   0:00 postgres: autovacuum launcher   
pg1       79424  0.0  0.0 129272  1028 ?        Ss   10:53   0:00 postgres: stats collector   
pg1       79425  0.0  0.0 318740  1384 ?        Ss   10:53   0:00 postgres: logical replication launcher   

60服务器的推送脚本增加如下内容:

#!/bin/bash
#!auther zsk
rsync -avz --port=11873 /home/pg1/ rsync@192.168.123.61::pgsql_danku --password-file=/etc/rsync.passwd
rsync -avz --port=11873 /usr/local/pgsql/data/  rsync@192.168.123.61::pgsql_all --password-file=/etc/rsync.passwd

再次推送文件到服务端:

。。。。。前面的略略略。。。。。。。。。
pg_stat_tmp/pgss_query_texts.stat
pg_subtrans/
pg_subtrans/0000
pg_tblspc/
pg_tblspc/32771 -> /opt/custome-tablespace
pg_twophase/
pg_wal/
pg_wal/00000003.history
pg_wal/00000004.history
pg_wal/000000040000000000000010
pg_wal/000000040000000000000011
pg_wal/archive_status/
pg_wal/archive_status/00000003.history.done
pg_xact/
pg_xact/0000

sent 6,189,113 bytes  received 32,673 bytes  1,777,653.14 bytes/sec
total size is 78,376,166  speedup is 12.60

到61服务器上查看远备的情况:

[root@centos61 ~]# cd /data/pgsql_all/
[root@centos61 pgsql_all]# ls
backup_label.old  pg_commit_ts                 pg_ident.conf  pg_serial     pg_tblspc    postgresql.auto.conf
base              pg_dynshmem                  pg_logical     pg_snapshots  pg_twophase  postgresql.conf
current_logfiles  pg_enterprise_views.explain  pg_multixact   pg_stat       PG_VERSION   postmaster.opts
global            pg_enterprise_views.stat     pg_notify      pg_stat_tmp   pg_wal       postmaster.pid
log               pg_hba.conf                  pg_replslot    pg_subtrans   pg_xact      tablespace_map.old
[root@centos61 pgsql_all]# cd /data/pgsql_danku/
[root@centos61 pgsql_danku]# ll
total 40
-rw-------. 1 postgres postgres 35091 Jun 10 10:53 logfile
-rw-------. 1 postgres postgres  1517 Jun 10 10:51 test3.dump

那么, 现在61服务器上的这个/data/pgsql_all/目录是可以直接启动为一个数据库的,只是现在缺少了lib目录和bin目录

这两个目录准备好后,就可以以备份文件为data,启动一个新的postgresql了:

[root@centos61 pgsql_all]# su - postgres  -c "pg_ctl -D /data/pgsql_all/ start"
pg_ctl: another server might be running; trying to start server anyway
waiting for server to start....2023-06-10 12:39:46.401 CST 3090 @ from  [vxid: txid:0] [] LOG:  starting PostgreSQL 12.5 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16), 64-bit
2023-06-10 12:39:46.406 CST 3090 @ from  [vxid: txid:0] [] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2023-06-10 12:39:46.406 CST 3090 @ from  [vxid: txid:0] [] LOG:  listening on IPv6 address "::", port 5432
2023-06-10 12:39:46.413 CST 3090 @ from  [vxid: txid:0] [] LOG:  listening on Unix socket "/tmp/.s.PGSQL.5432"
2023-06-10 12:39:46.920 CST 3090 @ from  [vxid: txid:0] [] LOG:  could not open directory "pg_tblspc/32771/PG_12_201909212": No such file or directory
2023-06-10 12:39:46.921 CST 3090 @ from  [vxid: txid:0] [] LOG:  redirecting log output to logging collector process
2023-06-10 12:39:46.921 CST 3090 @ from  [vxid: txid:0] [] HINT:  Future log output will appear in directory "log".
 done
server started

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