add auto fetch ssl certs
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@@ -45,9 +45,9 @@
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@@ -309,24 +305,15 @@ if (!doNotTrack) {
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<div class="entry-content">
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<article>
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<p>這篇繼續講 pgbarman 透過 rsync/ssh 來備份 postgresql 資料庫的方式</p>
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<p>其實呢，透過 ssh 的方式來做備份，雖然最後有弄出來，但是我不知道到底做了什麼事才搞定</p>
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<p>也許要重新安裝一台來測試看看</p>
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<p>所以就簡單說一下邏輯、記得的指令、還有最後的config</p>
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<h5 id="ssh">ssh</h5>
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<p>在db server 上，讓 barman server 可以用barman 帳號透過ssh key 登入 postgres 帳號
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然後在 barman server 上，讓 db server 可以用postgres帳號透過 ssh key 登入 barman 帳號</p>
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<h5 id="barman-d">barman.d</h5>
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<h5 id="barmand">barman.d</h5>
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<p>在/etc/barman.d/ 底下新增一個hqs019-ssh.conf</p>
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<p>內容如下</p>
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<pre><code>[hqs019-ssh]
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description = "hqs019 (via SSH)"
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ssh_command = ssh postgres@hqs019
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@@ -335,32 +322,19 @@ backup_method = rsync
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reuse_backup = link
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parallel_jobs = 5
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archiver = on
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</code></pre>
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<h5 id="postgresql-conf">postgresql.conf</h5>
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</code></pre><h5 id="postgresqlconf">postgresql.conf</h5>
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<p>新增跟barman有關的設定如下</p>
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<pre><code>### for barman test
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wal_level = 'archive'
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archive_mode = on
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archive_command = 'rsync -a %p barman@192.168.11.192:/var/lib/barman/hqs019-ssh/incoming/%f'
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</code></pre>
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<p>理論上這樣就可以了，但是實際上碰到很多問題</p>
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</code></pre><p>理論上這樣就可以了，但是實際上碰到很多問題</p>
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<p>主要都是這個錯誤訊息</p>
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<pre><code>WAL archive: FAILED (please make sure WAL shipping is setup)
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</code></pre>
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<p>碰到這狀況，google 都會告訴你，在 postgresql.conf 裡面 archive_command 的路徑，要和 barman server 上的設定一致
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<img src="https://i.imgur.com/3dMdytn.png" alt="" /></p>
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</code></pre><p>碰到這狀況，google 都會告訴你，在 postgresql.conf 裡面 archive_command 的路徑，要和 barman server 上的設定一致
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<img src="https://i.imgur.com/3dMdytn.png" alt=""></p>
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<p>但是我的路徑就沒有問題，還是一直跳這個錯誤</p>
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<p>接著我又在 barman server 這邊做了這些事情</p>
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<pre><code>barman check hqs019-ssh
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barman check hqs019-ssh
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barman check hqs019-ssh
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@@ -384,18 +358,11 @@ barman backup hqs019-ssh
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barman show-server hqs019
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barman check hqs019
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</code></pre>
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<p>前面幾次 barman check 一直都不通過</p>
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</code></pre><p>前面幾次 barman check 一直都不通過</p>
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<p>然後在 barman cron / barman switch-xlog hqs019-ssh (其實這個動作我做過好多次)</p>
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<p>想說確認一下psql 連接是不是正確(也的確正確無誤)</p>
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<p>接著第一次 check 還是FAILED 喔，過沒多久我再跑一次 check 又正常了… WTF !!!</p>
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<p>只要check 正常，接著跑 backup 應該就會很順利</p>
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<pre><code>barman@barman:~$ barman backup hqs019-ssh
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Starting backup using rsync-exclusive method for server hqs019-ssh in /var/lib/barman/hqs019-ssh/base/20190823T113229
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Backup start at LSN: 264/B7000028 (0000000100000264000000B7, 00000028)
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@@ -415,16 +382,10 @@ Processing xlog segments from file archival for hqs019-ssh
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0000000100000264000000B7
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0000000100000264000000B7.00000028.backup
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barman@barman:~$
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</code></pre>
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<p>檢查一下狀態</p>
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</code></pre><p>檢查一下狀態</p>
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<pre><code>barman@barman:~$ barman list-backup hqs019-ssh
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hqs019-ssh 20190823T113229 - Thu Aug 22 20:38:13 2019 - Size: 132.9 GiB - WAL Size: 0 B (tablespaces: tablespace_a:/var/lib/postgresql/10/main/tablespace_A, tablespace_b:/var/lib/postgresql/10/main/tablespace_B)
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</code></pre>
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<p>然後為了驗證是不是跑增量備份，所以再執行一次 backup</p>
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</code></pre><p>然後為了驗證是不是跑增量備份，所以再執行一次 backup</p>
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<pre><code>barman@barman:~$ barman backup hqs019-ssh
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Starting backup using rsync-exclusive method for server hqs019-ssh in /var/lib/barman/hqs019-ssh/base/20190823T132124
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Backup start at LSN: 264/B9000028 (0000000100000264000000B9, 00000028)
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@@ -439,22 +400,13 @@ Processing xlog segments from file archival for hqs019-ssh
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0000000100000264000000B9
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0000000100000264000000B9.00000028.backup
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barman@barman:~$
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</code></pre>
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<p>可以發現第一次跑了一個多小時，第二次只跑了五秒鐘 (因為資料庫根本沒異動)</p>
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</code></pre><p>可以發現第一次跑了一個多小時，第二次只跑了五秒鐘 (因為資料庫根本沒異動)</p>
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<p>到這邊雖然功能驗證沒有問題，可是不知道怎麼弄出來的，還是讓我很阿雜..</p>
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<p>應該會再找時間來重作一台，然後順便測試看看restore</p>
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<p>update</p>
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<p>剛剛又做了一次測試，config 都一樣</p>
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<p>果然要先做 barman cron/barman switch-xlog hqs019-ssh</p>
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<p>然後再做 barman check 就可以通過了</p>
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<p>在文件裡面很少提到這部份，筆記一下，用ansible 去跑的時候才不會忘記</p>
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</article>
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@@ -732,7 +684,7 @@ title="pinterest icon"></i>
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<p>© 2018 Göran Svensson</p>
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<p>© 2018 Göran Svensson</p>
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