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Title: MySQL backup script
Date: 2016-03-13
Category: Script
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.
## The script
For the script to work, you'll need to edit a few variable to match your configuration.
- `BACKUPDIR` is the path of the directory where you want your backups to be stored.
- `BACKUPUSR` is the user that will connect to MySQL to dump the databases. It should have access to all you databases without needing a password.
- `EXCLUDELIST` is a list of databases that should not be backed-up. Leaving it as is is probably fine.
```bash
#!/bin/bash
BACKUPDIR="/home/user/backup"
BACKUPUSR="user"
EXCLUDELIST="^Databases$|^information_schema$|^mysql$|^performance_schema$"
sqlbk() {
for each in $(mysqlshow | awk '/[[:alnum:]]/{print $2}'); do
if [[ $each =~ $EXCLUDELIST ]]; then
true
else
mysqldump $each | bzip2 > ${BACKUPDIR}/${each}.sql.bz2
chown ${BACKUPUSR}: ${BACKUPDIR}/${each}.sql.bz2 && chmod 600 ${BACKUPDIR}/${each}.sql.bz2
fi
done
}
[[ -e /usr/bin/mysql ]] && sqlbk
```
I personnaly have this script running once a week, in my user's personnal crontab (editable using the `crontab -e` command) :
```
## WEEKLY DATABASE BACKUP
@weekly /home/user/bin/backupdb
```
# Conclusion
You've probably noticed that the script erases the previous backup when a new one is made.
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 [Rsnapshot](http://rsnapshot.org/). I'll probably write an article on the subject in the future.
As usual, feedback is always appreciated !

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<h1>MySQL backup script</h1>
<span class="meta">Posted by
<a href="https://captainark.net/author/antoine-joubert.html">Antoine Joubert</a>
on Sun 13 March 2016
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<article>
<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>
<h2>The script</h2>
<p>For the script to work, you'll need to edit a few variable to match your configuration.</p>
<ul>
<li><code>BACKUPDIR</code> is the path of the directory where you want your backups to be stored.</li>
<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>
<li><code>EXCLUDELIST</code> is a list of databases that should not be backed-up. Leaving it as is is probably fine.</li>
</ul>
<div class="highlight"><pre><span></span><span class="ch">#!/bin/bash</span>
<span class="nv">BACKUPDIR</span><span class="o">=</span><span class="s2">&quot;/home/user/backup&quot;</span>
<span class="nv">BACKUPUSR</span><span class="o">=</span><span class="s2">&quot;user&quot;</span>
<span class="nv">EXCLUDELIST</span><span class="o">=</span><span class="s2">&quot;^Databases</span>$<span class="s2">|^information_schema</span>$<span class="s2">|^mysql</span>$<span class="s2">|^performance_schema</span>$<span class="s2">&quot;</span>
sqlbk<span class="o">()</span> <span class="o">{</span>
<span class="k">for</span> each in <span class="k">$(</span>mysqlshow <span class="p">|</span> awk <span class="s1">&#39;/[[:alnum:]]/{print $2}&#39;</span><span class="k">)</span><span class="p">;</span> <span class="k">do</span>
<span class="k">if</span> <span class="o">[[</span> <span class="nv">$each</span> <span class="o">=</span>~ <span class="nv">$EXCLUDELIST</span> <span class="o">]]</span><span class="p">;</span> <span class="k">then</span>
<span class="nb">true</span>
<span class="k">else</span>
mysqldump <span class="nv">$each</span> <span class="p">|</span> bzip2 &gt; <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
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">${</span><span class="nv">each</span><span class="si">}</span>.sql.bz2 <span class="o">&amp;&amp;</span> chmod <span class="m">600</span> <span class="si">${</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
<span class="k">fi</span>
<span class="k">done</span>
<span class="o">}</span>
<span class="o">[[</span> -e /usr/bin/mysql <span class="o">]]</span> <span class="o">&amp;&amp;</span> sqlbk
</pre></div>
<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>
<div class="highlight"><pre><span></span>## WEEKLY DATABASE BACKUP
@weekly /home/user/bin/backupdb
</pre></div>
<h1>Conclusion</h1>
<p>You've probably noticed that the script erases the previous backup when a new one is made.</p>
<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>
<p>As usual, feedback is always appreciated !</p>
</article>
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