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update some content

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Eric Chang
2021-10-28 14:15:01 +08:00
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commit 27b5a11382
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public/post/backup-restore-postgresql-with-pgbackrest/index.html
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@@ -307,7 +307,7 @@ if (!doNotTrack) {
<p>這兩天在測試pgbackrest ，簡單筆記一下測試狀況</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 tabindex="0"><code>sudo apt install pgbackrest
<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
@@ -317,7 +317,7 @@ if (!doNotTrack) {
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 tabindex="0"><code>postgres@hqdc039:~$ cat /etc/pgbackrest/pgbackrest.conf
<pre><code>postgres@hqdc039:~$ cat /etc/pgbackrest/pgbackrest.conf
[demo]
pg1-path=/database/11/main
@@ -361,7 +361,7 @@ process-max=4
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 tabindex="0"><code>postgres@hqdc039:~$ grep -A 100 &quot;for pgbackrest&quot; /etc/postgresql/11/main/postgresql.conf
<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
@@ -375,7 +375,7 @@ postgres@hqdc039:~$
<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 tabindex="0"><code>the maximum number of simultaneously running WAL sender processes
<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>
@@ -391,14 +391,14 @@ postgres@hqdc039:~$
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 tabindex="0"><code>postgres@hqdc039:~$ pgbackrest --stanza=demo stanza-create --log-level-console=detail
<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 tabindex="0"><code>postgres@hqdc039:~$ pgbackrest --stanza=demo --log-level-console=detail backup
<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
@@ -425,7 +425,7 @@ WARN: a timeline switch has occurred since the last backup, enabling delta check
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 tabindex="0"><code>postgres@hqdc039:~$ pgbackrest --stanza=demo --log-level-console=info info
<pre><code>postgres@hqdc039:~$ pgbackrest --stanza=demo --log-level-console=info info
stanza: demo
status: ok
cipher: aes-256-cbc
@@ -454,12 +454,12 @@ postgres@hqdc039:~$
<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 tabindex="0"><code>postgres@hqdc034:/zp/database$ time dropdb demo
<pre><code>postgres@hqdc034:/zp/database$ time dropdb demo
</code></pre><p>然後停止postgresql 服務</p>
<pre tabindex="0"><code>postgres@hqdc034:/zp/database$ pg_ctlcluster 10 main stop
<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 tabindex="0"><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
<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
@@ -473,15 +473,15 @@ 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 <em><strong>2019-09-05 11:00:00.268248+08</strong></em>
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 tabindex="0"><code>postgres@hqdc034:/zp/database$ psql -Atc &quot;select current_timestamp&quot;
<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 tabindex="0"><code>postgres@hqdc034:/zp/database$ cat /zp/database/10/main/recovery.conf
<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 tabindex="0"><code>postgres@hqdc034:/zp/database$ pg_ctlcluster 10 main start
<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
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