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add backup restore postgresql with pgbackrest

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Eric Chang
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<h3><a href="/post/backup-restore-postgresql-with-pgbackrest/">[筆記] 用pbackrest 備份還原 postgresql / Backup Restore Postgresql With Pgbackrest</a></h3>
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<span class="author"><a href="/author/eric-chang">Eric Chang</a></span>
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<p>這兩天在測試pgbackrest ，簡單筆記一下測試狀況</p>
<p></p>
<h4 id="install">install</h4>
<p>在ubuntu 18.04 安裝pgbackrest 很簡單，內建在apt裡面，所以可以直接用</p>
<pre><code>sudo apt install pgbackrest
</code></pre>
<p>進行安裝</p>
<h4 id="config">config</h4>
<p>pgbackrest 的設定檔在 /etc/pgbackrest/pgbackrest.conf
如果是用apt 安裝，預設會建立一個 /etc/pgbackrest.conf
但是這個路徑是錯誤的
執行 pgbackrest的時候，預設還是會去讀取 /etc/pgbackrest/pgbackrest.conf
要特別注意，要不就是每次都指定config路徑，要不就是把那個錯誤的設定檔幹掉</p>
<h4 id="config-內容">config 內容</h4>
<p>內容其實很簡單</p>
<pre><code>postgres@hqdc039:~$ cat /etc/pgbackrest/pgbackrest.conf
[demo]
pg1-path=/database/11/main
[global]
repo1-cipher-pass=zWaf6XtpjIVZC5444yXB+cgFDFl7MxGlgkZSaoPvTGirhPygu4jOKOXf9LO4vjfO
repo1-cipher-type=aes-256-cbc
repo1-path=/var/lib/pgbackrest
repo1-retention-full=2
[global:archive-push]
compress-level=3
process-max=4
</code></pre>
<p><strong>[demo]</strong> 用來指定這個 &ldquo;stanza&rdquo; 的名稱
* pg1-path 是資料庫存放的路徑</p>
<p><strong>[global]</strong> 中的兩個cipher 用途我不清楚，不設定也沒關係</p>
<ul>
<li>&ldquo;repo1-path&rdquo; 則是用來存放備份的路徑</li>
<li>&ldquo;repo1-retention-full&rdquo; 定義要保留幾次 full backup</li>
</ul>
<p><strong>[global:archive-push]</strong> 似乎是用來定義在備份/還原時的選項
* process-max 指定要用多少process (平行處理)</p>
<h4 id="簡單流程">簡單流程</h4>
<ul>
<li>config (pgbackrest &amp; postgresql )</li>
<li>建立 stanza</li>
<li>建立備份</li>
<li>(還原，如果有需要的話)</li>
</ul>
<h4 id="其他部份">其他部份</h4>
<ul>
<li>清除 stanza (刪除備份)</li>
<li>踩到的地雷</li>
</ul>
<hr />
<h4 id="設定-pgbackrest-postgresql">設定 pgbackrest &amp; postgresql</h4>
<p>pgbackrest 基本上設定很簡單，內容就跟上面的一樣就可以跑了。
當然要新增其他進階的，就要自己研究了，內容有夠長
<a href="https://pgbackrest.org/configuration.html">https://pgbackrest.org/configuration.html</a></p>
<p>在postgresql 中，要新增一些設定，主要是 archive_command</p>
<pre><code>postgres@hqdc039:~$ grep -A 100 &quot;for pgbackrest&quot; /etc/postgresql/11/main/postgresql.conf
#for pgbackrest
archive_command = 'pgbackrest --stanza=demo archive-push %p'
archive_mode = on
listen_addresses = '*'
log_line_prefix = ''
max_wal_senders = 3
wal_level = replica
postgres@hqdc039:~$
</code></pre>
<p><strong>archive_command</strong>
這個因為要帶stanza 名稱進來，所以<strong>需要跟pgbackrest.conf 裡面定義的名稱一致</strong></p>
<p><strong>max_wal_senders</strong>
簡單說就是定義在抄寫wal 的時候，可以同時抄給幾台
這是postgresql 的說明</p>
<pre><code>the maximum number of simultaneously running WAL sender processes
</code></pre>
<p><strong>wal_level</strong>
有三種等級，參考 <a href="https://blog.csdn.net/pg_hgdb/article/details/78666719">https://blog.csdn.net/pg_hgdb/article/details/78666719</a></p>
<ul>
<li>minimal &ndash;不能通过基础备份和wal日志恢复数据库。</li>
<li>replica = 9.6版本以前的archive和hot_standby &ndash;该级别支持wal归档和复制。</li>
<li>logical &ndash;在replica级别的基础上添加了支持逻辑解码所需的信息。</li>
</ul>
<p>設定完成後，重起 postgresql 就可以了</p>
<h4 id="建立-stanza">建立 stanza</h4>
<p>stanza 這名詞我是第一次聽到，直接翻譯就是 <strong>&rdquo;&ldquo;（詩的）節，段&rdquo;</strong></p>
<p><a href="https://dictionary.cambridge.org/zht/%E8%A9%9E%E5%85%B8/%E8%8B%B1%E8%AA%9E-%E6%BC%A2%E8%AA%9E-%E7%B9%81%E9%AB%94/stanza">https://dictionary.cambridge.org/zht/%E8%A9%9E%E5%85%B8/%E8%8B%B1%E8%AA%9E-%E6%BC%A2%E8%AA%9E-%E7%B9%81%E9%AB%94/stanza</a></p>
<p>在pgbackrest中，可以一次定義多個 stanza，用來備份不同的DB
這次環境很簡單，所以就只有設定一個
依照上面的pgbackrest.conf 內容設定好了，需要先建立這個stanza
指令:</p>
<pre><code>postgres@hqdc039:~$ pgbackrest --stanza=demo stanza-create --log-level-console=detail
2019-09-04 16:21:40.700 P00 INFO: stanza-create command begin 2.16: --log-level-console=detail --pg1-path=/database/11/main --repo1-cipher-pass=&lt;redacted&gt; --repo1-cipher-type=aes-256-cbc --repo1-path=/var/lib/pgbackrest --stanza=demo
2019-09-04 16:21:41.525 P00 INFO: stanza-create command end: completed successfully (825ms)
postgres@hqdc039:~$
</code></pre>
<p>接著就可以執行備份了</p>
<h4 id="backup">backup</h4>
<p>備份指令也很簡單，要注意的是，如果不帶參數，pgbackrest 會自行決定要用incremental或者是 full backup</p>
<pre><code>postgres@hqdc039:~$ pgbackrest --stanza=demo --log-level-console=detail backup
2019-09-04 16:41:17.458 P00 INFO: backup command begin 2.16: --log-level-console=detail --pg1-path=/database/11/main --repo1-cipher-pass=&lt;redacted&gt; --repo1-cipher-type=aes-256-cbc --repo1-path=/var/lib/pgbackrest --repo1-retention-full=2 --stanza=demo
2019-09-04 16:41:17.697 P00 INFO: last backup label = 20190904-134245F, version = 2.16
2019-09-04 16:41:18.607 P00 INFO: execute non-exclusive pg_start_backup() with label &quot;pgBackRest backup started at 2019-09-04 16:41:17&quot;: backup begins after the next regular checkpoint completes
2019-09-04 16:41:19.008 P00 INFO: backup start archive = 000000100000000E0000004A, lsn = E/4A000028
WARN: a timeline switch has occurred since the last backup, enabling delta checksum
2019-09-04 16:41:21.213 P01 DETAIL: match file from prior backup /database/11/main/base/51435/51488 (546.3MB, 20%) checksum 5eb4f73d9b1c535ebfdfb622d930dade87e23786
2019-09-04 16:41:21.821 P01 DETAIL: match file from prior backup /database/11/main/base/51435/51460 (455.3MB, 37%) checksum aa74bba2bea8823789ad4194e4574b44a020271a
...
...
...
2019-09-04 16:41:24.827 P01 DETAIL: match file from prior backup /database/11/main/PG_VERSION (3B, 100%) checksum dd71038f3463f511ee7403dbcbc87195302d891c
2019-09-04 16:41:24.835 P01 INFO: backup file /database/11/main/base/13125/51569 (0B, 100%)
2019-09-04 16:41:24.860 P00 INFO: incr backup size = 2.5GB
2019-09-04 16:41:24.860 P00 INFO: execute non-exclusive pg_stop_backup() and wait for all WAL segments to archive
2019-09-04 16:41:24.961 P00 INFO: backup stop archive = 000000100000000E0000004A, lsn = E/4A000130
2019-09-04 16:41:24.964 P00 DETAIL: wrote 'pg_data/backup_label' file returned from pg_stop_backup()
2019-09-04 16:41:25.155 P00 INFO: new backup label = 20190904-134245F_20190904-164117I
2019-09-04 16:41:25.194 P00 INFO: backup command end: completed successfully (7736ms)
2019-09-04 16:41:25.194 P00 INFO: expire command begin
2019-09-04 16:41:25.214 P00 INFO: full backup total &lt; 2 - using oldest full backup for 11-1 archive retention
2019-09-04 16:41:25.214 P00 DETAIL: archive retention on backup 20190904-134245F, archiveId = 11-1, start = 0000000D0000000E00000048
2019-09-04 16:41:25.215 P00 DETAIL: no archive to remove, archiveId = 11-1
2019-09-04 16:41:25.215 P00 INFO: expire command end: completed successfully (21ms)
postgres@hqdc039:~$
</code></pre>
<p>執行後，可以檢查一下</p>
<pre><code>postgres@hqdc039:~$ pgbackrest --stanza=demo --log-level-console=info info
stanza: demo
status: ok
cipher: aes-256-cbc
db (current)
wal archive min/max (11-1): 0000000D0000000E00000048/000000100000000E0000004A
full backup: 20190904-134245F
timestamp start/stop: 2019-09-04 13:42:45 / 2019-09-04 13:48:54
wal start/stop: 0000000D0000000E00000048 / 0000000D0000000E00000048
database size: 2.6GB, backup size: 2.6GB
repository size: 547MB, repository backup size: 547MB
incr backup: 20190904-134245F_20190904-164117I
timestamp start/stop: 2019-09-04 16:41:17 / 2019-09-04 16:41:25
wal start/stop: 000000100000000E0000004A / 000000100000000E0000004A
database size: 2.6GB, backup size: 2.2MB
repository size: 547MB, repository backup size: 220.4KB
backup reference list: 20190904-134245F
postgres@hqdc039:~$
</code></pre>
<h4 id="還原測試">還原測試</h4>
<p>pgbackrest 的還原因為透過WAL ，所以有一些觀念需要先釐清
本來我的測試是先做好備份，然後直接砍掉 DB，接著再用restore還原
卻發現砍掉的DB居然沒有回來..
後來看了這一篇，然後又研究了一下 <strong>Point-in-Time Recovery</strong>
<a href="https://github.com/pgbackrest/pgbackrest/issues/800">https://github.com/pgbackrest/pgbackrest/issues/800</a>
才找到正確的用法</p>
<p>先把DB整個砍掉</p>
<pre><code>postgres@hqdc034:/zp/database$ time dropdb demo
</code></pre>
<p>然後停止postgresql 服務</p>
<pre><code>postgres@hqdc034:/zp/database$ pg_ctlcluster 10 main stop
sudo systemctl stop postgresql@10-main
</code></pre>
<p>接著就可以來下指令還原了</p>
<pre><code>postgres@hqdc034:/zp/database$ time pgbackrest --stanza=demo --log-level-console=info --delta --type=time &quot;--target=2019-09-05 11:00:00.268248+08&quot; --target-action=promote restore
2019-09-05 11:15:57.480 P00 INFO: restore command begin 2.13: --delta --log-level-console=info --pg1-path=/zp/database/10/main --process-max=4 --repo1-path=/var/lib/pgbackrest --stanza=demo --target=&quot;2019-09-05 11:00:00.268248+08&quot; --target-action=promote --type=time
2019-09-05 11:15:57.624 P00 INFO: restore backup set 20190905-111109F
2019-09-05 11:15:57.947 P00 INFO: remove invalid files/paths/links from /zp/database/10/main
2019-09-05 11:16:00.440 P01 INFO: restore file /zp/database/10/main/global/pg_control.pgbackrest.tmp (8KB, 99%) checksum e253f9d706ac59e1ec0408ba477d1d5bac41b20f
2019-09-05 11:16:00.791 P00 INFO: write /zp/database/10/main/recovery.conf
2019-09-05 11:16:00.797 P00 INFO: restore global/pg_control (performed last to ensure aborted restores cannot be started)
2019-09-05 11:16:00.800 P00 INFO: restore command end: completed successfully (3321ms)
real 0m3.328s
user 0m6.896s
sys 0m0.832s
</code></pre>
<p>在DB目錄中，會產生一個recovery.conf，這是用來給 postgresql 看的檔案，裡面會紀錄怎麼還原、以及還原的類型、時間點，這邊指定要恢復到 <strong><em>2019-09-05 11:00:00.268248+08</em></strong>
這個時間格式要看資料庫的設定，可以藉由以下指令得到</p>
<pre><code>postgres@hqdc034:/zp/database$ psql -Atc &quot;select current_timestamp&quot;
2019-09-05 11:14:27.268248+08
</code></pre>
<p>檢查一下recovery.conf</p>
<pre><code>postgres@hqdc034:/zp/database$ cat /zp/database/10/main/recovery.conf
restore_command = 'pgbackrest --log-level-console=info --stanza=demo archive-get %f &quot;%p&quot;'
recovery_target_time = '2019-09-05 11:00:00.268248+08'
recovery_target_action = 'promote'
</code></pre>
<p>重新啟動postgresql 然後看看被砍掉的demo DB有沒有回來</p>
<pre><code>postgres@hqdc034:/zp/database$ pg_ctlcluster 10 main start
Warning: the cluster will not be running as a systemd service. Consider using systemctl:
sudo systemctl start postgresql@10-main
postgres@hqdc034:/zp/database$ psql
psql (10.8 (Ubuntu 10.8-1.pgdg14.04+1))
Type &quot;help&quot; for help.
postgres=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
demo | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
(4 rows)
postgres=# \q
postgres@hqdc034:/zp/database$
</code></pre>
<p>很好， demo DB 有順利的還原回來了，先暫時測試到這邊。接下來要來玩postgresql on zfs</p>
<p>後續如果想更深入測試 pgbackrest，可以試試看異機備份還原。</p>
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