pgBackRest是一款開源的備份還原工具，目标旨在為備份和還原提供可靠易用的備份。
前言
特性
并行備份和還原
備份操作期間壓縮通常是其瓶頸所在。pgBackRest通過并行處了解決了備份期間壓縮出現的瓶頸問題。
本地遠端操作
自定義協定允許 pgBackRest以最小化配置通過SSH在本地或者遠端執行備份、還原和歸檔。并且該程式也通過協定層提供了PostgreSQL查詢接口，以便于必須要再遠端通路PostgreSQL，進而保證了其安全性能。
全量，增量和差異備份
支援全量，增量和差異備份。pgBackRest不受異步時間影響，是以差異和增量備份完全安全。
備份保留政策和和歸檔過期
支援保留政策設定可以在任意時間建立全備和差異備份的覆寫。
備份完整性
可以計算備份中每個檔案的校驗和，并在還原期間重新檢查。備份完成檔案複制後，将等待直到每個WAL段所需的備份保持一緻然後存儲到備份倉庫中。
塊校驗和
斷點備份
流壓縮和校驗和
增量還原
并行異步WAL Push和Get
表空間重新映射和Link支援
S3存儲支援和Azure相容對象存儲支援
加密
使用
安裝
解壓
[postgres@pgserver12 tools]$ tar -zxf pgbackrest-release-2.31.tar.gz
[postgres@pgserver12 tools]$ ls 建立必要目錄
ostgres@sungsasong ~]$ sudo mkdir -p -m 770 /var/log/pgbackrest
[postgres@sungsasong ~]$ sudo chown postgres.postgres /var/log/pgbackrest/
[postgres@sungsasong ~]$ sudo mkdir -p /etc/pgbackrest
[postgres@sungsasong ~]$ sudo mkdir -p /etc/pgbackrest/conf.d
[postgres@sungsasong ~]$ sudo touch /etc/pgbackrest/pgbackrest.conf
[postgres@sungsasong ~]$ sudo chmod 640 /etc/pgbackrest/pgbackrest.conf
[postgres@sungsasong ~]$ sudo chown postgres.postgres -R /etc/pgbackrest/
[postgres@sungsasong ~]$ sudo mkdir /usr/bin/pgbackrest
[postgres@sungsasong ~]$ sudo chown postgres.postgres /usr/bin/pgbackrest/
[postgres@sungsasong ~]$ sudo chmod 755 /usr/bin/pgbackrest/ 編譯安裝
[postgres@sungsasong src]$ ./configure --prefix=/usr/bin/pgbackrest/
[postgres@sungsasong src]$ make -j24
[postgres@sungsasong src]$ make install -j24
install -d /usr/bin/pgbackrest/bin
install -m 755 pgbackrest /usr/bin/pgbackrest/bin 指令測試
[postgres@sungsasong src]$ /usr/bin/pgbackrest/bin/pgbackrest
pgBackRest 2.31 - General help
Usage:
pgbackrest [options] [command]
Commands:
archive-get Get a WAL segment from the archive.
archive-push Push a WAL segment to the archive.
backup Backup a database cluster.
check Check the configuration.
expire Expire backups that exceed retention.
help Get help.
info Retrieve information about backups.
restore Restore a database cluster.
stanza-create Create the required stanza data.
stanza-delete Delete a stanza.
stanza-upgrade Upgrade a stanza.
start Allow pgBackRest processes to run.
stop Stop pgBackRest processes from running.
version Get version.
Use 'pgbackrest help [command]' for more information. 配置資料庫監聽和通路及日志（可選）
[postgres@sungsasong pgbackrest-release-2.31]$ egrep "10.10" $PGDATA/pg_hba.conf
host all all 10.10.20.0/24 trust
[postgres@sungsasong pgbackrest-release-2.31]$ egrep -v "^#" $PGDATA/postgresql.auto.conf
logging_collector = 'on'
listen_addresses = '*' 配置PostgreSQL資料庫資料存儲目錄
[postgres@sungsasong src]$ cat >>/etc/pgbackrest/pgbackrest.conf <<EOF
> [demo]
> pgl-path=/data/pg10/pgdata
> EOF 配置環境變量
[postgres@sungsasong ~]$ echo "export PATH=/usr/bin/pgbackrest/bin:\$PATH" >> .bashrc 建立備份和歸檔倉庫
[postgres@sungsasong ~]$ sudo mkdir -p /pgbackrest/repos
[postgres@sungsasong ~]$ sudo chmod 750 /pgbackrest/ -R
[postgres@sungsasong ~]$ sudo chown postgres.postgres /pgbackrest/ -R 将倉庫路徑加載在pgBackRest配置檔案中
[postgres@sungsasong ~]$ cat /etc/pgbackrest/pgbackrest.conf
[demo]
pgl-path=/data/pg10/pgdata
[global]
repol-path=/pgbackrest/repos 配置資料庫歸檔
[postgres@sungsasong ~]$ egrep -v "^#" $PGDATA/postgresql.auto.conf
logging_collector = 'on'
archive_mode = 'on'
archive_command = 'pgbackrest --stanza=demo archive-push %p'
listen_addresses = '*'
log_filename = 'postgresql.log'
log_line_prefix = ''
max_wal_senders = '3'
wal_level = 'replica' 重新啟動資料庫
[postgres@sungsasong ~]$ pg_ctl restart -D $PGDATA -l /tmp/logfile
waiting for server to shut down.... done
server stopped
waiting for server to start.... done
server started 可選配置歸檔壓縮
[postgres@sungsasong ~]$ cat /etc/pgbackrest/pgbackrest.conf
[demo]
pgl-path=/data/pg10/pgdata
[global]
repol-path=/pgbackrest/repos
[global:archive_push]
compress-level=3 配置基于保留政策的歸檔
[postgres@sungsasong ~]$ cat /etc/pgbackrest/pgbackrest.conf
[demo]
pg1-path=/data/pg10/pgdata
pg1-host-config-path=/data/pg10/pgbackrest
pg1-host-port=22
pg1-host-user=postgres
pg1-host=sungsasong
pg1-port=10001
pg1-user=postgres
[global]
repo1-path=/pgbackrest/repos
repo1-retention-full=2
[global:archive_push]
compress-level=3 建立存儲空間并檢查配置
[postgres@sungsasong ~]$ pgbackrest --stanza=demo --log-level-console=info stanza-create
2021-01-08 20:42:58.887 P00 INFO: stanza-create command begin 2.31: --exec-id=9283-e9744c3e --log-level-console=info --pg1-host=sungsasong --pg1-host-config-path=/data/pg10/pgbackrest --pg1-host-port=22 --pg1-host-user=postgres --pg1-path=/data/pg10/pgdata --pg1-port=10001 --pg1-user=postgres --repo1-path=/pgbackrest/repos --stanza=demo
2021-01-08 20:42:59.835 P00 INFO: stanza-create command end: completed successfully (948ms) 檢查配置
[postgres@sungsasong ~]$ pgbackrest --stanza=demo --log-level-console=info check
2021-01-08 21:41:29.851 P00 INFO: check command begin 2.31: --exec-id=21648-1862ac0d --log-level-console=info --pg1-path=/data/pg10/pgdata --pg1-port=10001 --pg1-user=postgres --repo1-path=/pgbackrest/repos --stanza=demo
2021-01-08 21:41:32.826 P00 INFO: WAL segment 000000010000000000000006 successfully archived to '/pgbackrest/repos/archive/demo/10-1/0000000100000000/000000010000000000000006-2f027934f4f35cd3983ca4b1b7b43c32ab089448.gz'
2021-01-08 21:41:32.826 P00 INFO: check command end: completed successfully (2975ms) 執行備份
預設為增量備份，增量備份将會請求一個基礎全備，如果沒有基礎全備，增量備份将會變更到全備。
pgbackrest --stanza=demo --log-level-console=info backup
2021-01-08 21:43:55.014 P00 INFO: backup command begin 2.31: --exec-id=21661-13c54272 --log-level-console=info --pg1-path=/data/pg10/pgdata --pg1-port=10001 --pg1-user=postgres --repo1-path=/pgbackrest/repos --repo1-retention-full=2 --stanza=demo
WARN: no prior backup exists, incr backup has been changed to full
...
此處省略很多輸出
...
2021-01-08 21:44:00.951 P00 INFO: full backup size = 23.3MB
2021-01-08 21:44:00.951 P00 INFO: execute non-exclusive pg_stop_backup() and wait for all WAL segments to archive
2021-01-08 21:44:01.153 P00 INFO: backup stop archive = 000000010000000000000008, lsn = 0/8000130
2021-01-08 21:44:01.154 P00 INFO: check archive for segment(s) 000000010000000000000008:000000010000000000000008
2021-01-08 21:44:01.273 P00 INFO: new backup label = 20210108-214355F
2021-01-08 21:44:01.301 P00 INFO: backup command end: completed successfully (6288ms)
2021-01-08 21:44:01.301 P00 INFO: expire command begin 2.31: --exec-id=21661-13c54272 --log-level-console=info --repo1-path=/pgbackrest/repos --repo1-retention-full=2 --stanza=demo
2021-01-08 21:44:01.304 P00 INFO: expire command end: completed successfully (3ms) 可以定義備份的類型為增量還是差異備份
使用—type參數指定
[postgres@sungsasong ~]$ pgbackrest --stanza=demo --log-level-console=info --type=diff backup
2021-01-08 21:47:00.964 P00 INFO: backup command begin 2.31: --exec-id=21671-d3f8f8bf --log-level-console=info --pg1-path=/data/pg10/pgdata --pg1-port=10001 --pg1-user=postgres --repo1-path=/pgbackrest/repos --repo1-retention-full=2 --stanza=demo --type=diff
2021-01-08 21:47:01.770 P00 INFO: last backup label = 20210108-214355F, version = 2.31
2021-01-08 21:47:01.770 P00 INFO: execute non-exclusive pg_start_backup(): backup begins after the next regular checkpoint completes
2021-01-08 21:47:02.309 P00 INFO: backup start archive = 00000001000000000000000A, lsn = 0/A000028
2021-01-08 21:47:03.617 P01 INFO: backup file /data/pg10/pgdata/global/pg_control (8KB, 99%) checksum 5f020e7df484269ea245041be3228673560184ef
2021-01-08 21:47:03.721 P01 INFO: backup file /data/pg10/pgdata/pg_logical/replorigin_checkpoint (8B, 100%) checksum 347fc8f2df71bd4436e38bd1516ccd7ea0d46532
2021-01-08 21:47:03.722 P00 INFO: diff backup size = 8KB
2021-01-08 21:47:03.722 P00 INFO: execute non-exclusive pg_stop_backup() and wait for all WAL segments to archive
2021-01-08 21:47:03.942 P00 INFO: backup stop archive = 00000001000000000000000A, lsn = 0/A0000F8
2021-01-08 21:47:03.943 P00 INFO: check archive for segment(s) 00000001000000000000000A:00000001000000000000000A
2021-01-08 21:47:04.062 P00 INFO: new backup label = 20210108-214355F_20210108-214701D
2021-01-08 21:47:04.092 P00 INFO: backup command end: completed successfully (3129ms)
2021-01-08 21:47:04.092 P00 INFO: expire command begin 2.31: --exec-id=21671-d3f8f8bf --log-level-console=info --repo1-path=/pgbackrest/repos --repo1-retention-full=2 --stanza=demo
2021-01-08 21:47:04.095 P00 INFO: expire command end: completed successfully (3ms) 備份資訊檢視
[postgres@sungsasong ~]$ pgbackrest info
stanza: demo
status: ok
cipher: none
db (current)
wal archive min/max (10-1): 000000010000000000000001/00000001000000000000000A
full backup: 20210108-214355F
timestamp start/stop: 2021-01-08 21:43:55 / 2021-01-08 21:44:01
wal start/stop: 000000010000000000000008 / 000000010000000000000008
database size: 23.3MB, backup size: 23.3MB
repository size: 2.7MB, repository backup size: 2.7MB
diff backup: 20210108-214355F_20210108-214701D
timestamp start/stop: 2021-01-08 21:47:01 / 2021-01-08 21:47:03
wal start/stop: 00000001000000000000000A / 00000001000000000000000A
database size: 23.3MB, backup size: 8.2KB
repository size: 2.7MB, repository backup size: 425B
backup reference list: 20210108-214355F 還原一個備份
模拟資料庫損壞
[postgres@sungsasong ~]$ cd $PGDATA/
[postgres@sungsasong pgdata]$ rm -rf *
#100分警告：千萬不要拿生産庫執行 執行還原
[postgres@sungsasong pgdata]$ pgbackrest --stanza=demo restore [postgres@sungsasong pgdata]$ pg_ctl start -D $PGDATA -l /tmp/logfile
waiting for server to start.... done
server started
[postgres@sungsasong pgdata]$ psql
psql (10.13)
Type "help" for help. 以上就是pgbackrest介紹及使用。目前使用的最新版本已經可以支援PostgreSQL13版本，僅僅是文檔上标注支援最新到PostgreSQL11版本。感興趣的同學可以下去試一下。
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