274 lines
14 KiB
HTML
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14 KiB
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<div class="post-heading">
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<h1>MySQL backup script</h1>
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<span class="meta">Posted by
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<a href="https://captainark.net/author/antoine-joubert.html">Antoine Joubert</a>
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on Sun 13 March 2016
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<!-- Post Content -->
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<article>
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<p>I wrote a MySQL database backup script a while back. I known they are more than enough of them already floating around the internet, but hey, I figured I'd share it here anyway.</p>
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<h2>The script</h2>
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<p>For the script to work, you'll need to edit a few variable to match your configuration.</p>
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<ul>
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<li><code>BACKUPDIR</code> is the path of the directory where you want your backups to be stored.</li>
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<li><code>BACKUPUSR</code> is the user that will connect to MySQL to dump the databases. It should have access to all you databases without needing a password.</li>
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<li><code>EXCLUDELIST</code> is a list of databases that should not be backed-up. Leaving it as is is probably fine.</li>
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</ul>
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<div class="highlight"><pre><span></span><span class="ch">#!/bin/bash</span>
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<span class="nv">BACKUPDIR</span><span class="o">=</span><span class="s2">"/home/user/backup"</span>
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<span class="nv">BACKUPUSR</span><span class="o">=</span><span class="s2">"user"</span>
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<span class="nv">EXCLUDELIST</span><span class="o">=</span><span class="s2">"^Databases</span>$<span class="s2">|^information_schema</span>$<span class="s2">|^mysql</span>$<span class="s2">|^performance_schema</span>$<span class="s2">"</span>
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sqlbk<span class="o">()</span> <span class="o">{</span>
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<span class="k">for</span> each in <span class="k">$(</span>mysqlshow <span class="p">|</span> awk <span class="s1">'/[[:alnum:]]/{print $2}'</span><span class="k">)</span><span class="p">;</span> <span class="k">do</span>
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<span class="k">if</span> <span class="o">[[</span> <span class="nv">$each</span> <span class="o">=</span>~ <span class="nv">$EXCLUDELIST</span> <span class="o">]]</span><span class="p">;</span> <span class="k">then</span>
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<span class="nb">true</span>
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<span class="k">else</span>
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mysqldump <span class="nv">$each</span> <span class="p">|</span> bzip2 > <span class="si">${</span><span class="nv">BACKUPDIR</span><span class="si">}</span>/<span class="si">${</span><span class="nv">each</span><span class="si">}</span>.sql.bz2
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chown <span class="si">${</span><span class="nv">BACKUPUSR</span><span class="si">}</span>: <span class="si">${</span><span class="nv">BACKUPDIR</span><span class="si">}</span>/<span class="si">${</span><span class="nv">each</span><span class="si">}</span>.sql.bz2 <span class="o">&&</span> chmod <span class="m">600</span> <span class="si">${</span><span class="nv">BACKUPDIR</span><span class="si">}</span>/<span class="si">${</span><span class="nv">each</span><span class="si">}</span>.sql.bz2
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<span class="k">fi</span>
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<span class="k">done</span>
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<span class="o">}</span>
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<span class="o">[[</span> -e /usr/bin/mysql <span class="o">]]</span> <span class="o">&&</span> sqlbk
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</pre></div>
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<p>I personnaly have this script running once a week, in my user's personnal crontab (editable using the <code>crontab -e</code> command) :</p>
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<div class="highlight"><pre><span></span>## WEEKLY DATABASE BACKUP
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@weekly /home/user/bin/backupdb
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</pre></div>
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<h1>Conclusion</h1>
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<p>You've probably noticed that the script erases the previous backup when a new one is made.</p>
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<p>I don't need to keep multiple versions of the same database backup on my servers because they are all saved remotely on a daily basis using <a href="http://rsnapshot.org/">Rsnapshot</a>. I'll probably write an article on the subject in the future.</p>
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<p>As usual, feedback is always appreciated !</p>
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</article>
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