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    <title>Sysadmin on oscarmlage</title>
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    <description>Recent content in Sysadmin on oscarmlage</description>
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    <lastBuildDate>Fri, 18 Sep 2026 18:10:00 +0200</lastBuildDate>
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    <item>
      <title>Mastodon BOFHers update to 4.7.2</title>
      <link>https://oscarmlage.com/posts/mastodon-bofhers-update-4-7-2/</link>
      <pubDate>Fri, 18 Sep 2026 18:10:00 +0200</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/mastodon-bofhers-update-4-7-2/</guid>
      <description>&lt;p&gt;I manage a small &lt;a href=&#34;https://joinmastodon.org/&#34;&gt;mastodon&lt;/a&gt; instance for BOFHers. You know, old computer people armed with their whips, ready to lart anything that moves too close to a keyboard.&lt;/p&gt;&#xA;&lt;p&gt;Doing admin work for that kind of crowd is a high risk sport. Doing it for free is even better. If something breaks, there is no mercy. If everything works, nobody says anything. So, the usual sysadmin deal.&lt;/p&gt;</description>
    </item>
    <item>
      <title>Por mí y por todos mis compañeros</title>
      <link>https://oscarmlage.com/posts/por-mi-y-por-todos-mis-companeros/</link>
      <pubDate>Sun, 13 Jan 2019 10:58:11 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/por-mi-y-por-todos-mis-companeros/</guid>
      <description>&lt;p&gt;Algo tan sencillo y aparentemente inocuo como un punto de montaje puede convertirse en una letal arma de destrucci&amp;oacute;n de paciencia/tiempo.&lt;/p&gt;&#xA;&lt;p&gt;Hay una especie de regla no escrita que sigo desde hace bastante tiempo en las instalaciones de los servidores pertenecientes a &lt;em&gt;OVH&lt;/em&gt;: centralizar todos los datos de servicios en &lt;code&gt;/home&lt;/code&gt;. Los &lt;em&gt;DocumentRoot&lt;/em&gt; de apache/nginx van en &lt;code&gt;/home/www&lt;/code&gt;, las bases de datos en &lt;code&gt;/home/mysql&lt;/code&gt;, etc...&lt;/p&gt;</description>
    </item>
    <item>
      <title>Una historia de backups, vacas sucias y Mr. Robot</title>
      <link>https://oscarmlage.com/posts/una-historia-de-backups-vacas-sucias-y-mr-robot/</link>
      <pubDate>Thu, 27 Oct 2016 10:52:34 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/una-historia-de-backups-vacas-sucias-y-mr-robot/</guid>
      <description>&lt;p&gt;Hace un rato, cuando he ido a abrir una de las aplicaciones de mi servidor me he dado cuenta que no funcionaba. La verdad es que no la uso demasiado a menudo pero ese &lt;em&gt;502&lt;/em&gt; sonaba a muy raro porque nunca antes hab&amp;iacute;a fallado.&lt;/p&gt;</description>
    </item>
    <item>
      <title>Sync is not backup, backup is not sync.</title>
      <link>https://oscarmlage.com/posts/sync-not-backup-backup-not-sync/</link>
      <pubDate>Sun, 18 Sep 2016 09:52:16 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/sync-not-backup-backup-not-sync/</guid>
      <description>&lt;p&gt;I had an issue - &lt;em&gt;nothing new&lt;/em&gt; - with the backups - &lt;em&gt;ouch&lt;/em&gt; - and this time it was my fault one hundred percent.&lt;/p&gt;&#xA;&lt;p&gt;Days ago I&#39;ve bought a &lt;a href=&#34;https://www.raspberrypi.org/&#34;&gt;Raspberry Pi&lt;/a&gt;, just to have fun with the possibilities (media center, retro games, download center...) you can do almost everything you can imagine. One of the ideas I had was to create a usb softraid with 2 external usb drives and add the raspi as &lt;a href=&#34;https://syncthing.net/&#34;&gt;Syncthing&lt;/a&gt; node, because I&#39;m using syncthing across some nodes to sync essential data, as backup (&lt;strong&gt;*err*&lt;/strong&gt;).&lt;/p&gt;</description>
    </item>
    <item>
      <title>Transferir VPS de un proyecto Public Cloud OVH a otro</title>
      <link>https://oscarmlage.com/posts/transferir-vps-de-un-proyecto-public-cloud-ovh-otro/</link>
      <pubDate>Thu, 12 May 2016 10:33:40 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/transferir-vps-de-un-proyecto-public-cloud-ovh-otro/</guid>
      <description>&lt;p&gt;Tengo que decir que soy un enamorado de lo que yo llamo &#34;&lt;em&gt;virtualizaci&amp;oacute;n de &amp;uacute;ltima generaci&amp;oacute;n&lt;/em&gt;&#34;. Como no soy ning&amp;uacute;n doctor en terminolog&amp;iacute;a - ni mucho menos - hablo de &lt;a href=&#34;https://www.docker.com/&#34;&gt;Docker&lt;/a&gt;, &lt;a href=&#34;https://openvz.org/Main_Page&#34;&gt;OpenVZ&lt;/a&gt;, &lt;a href=&#34;https://www.proxmox.com/en/&#34;&gt;Proxmox&lt;/a&gt;, &lt;a href=&#34;https://www.openstack.org/&#34;&gt;OpenStack&lt;/a&gt;... que habitualmente tienen herramientas e interfaces m&amp;aacute;s que asequibles para resolver muchos de los problemas que, a nivel de sistemas, se presentan hoy d&amp;iacute;a.&lt;/p&gt;</description>
    </item>
    <item>
      <title>Ampliación de una partición, VPS de OVH</title>
      <link>https://oscarmlage.com/posts/ampliacion-de-una-particion-vps-de-ovh/</link>
      <pubDate>Wed, 20 Apr 2016 08:21:14 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/ampliacion-de-una-particion-vps-de-ovh/</guid>
      <description>&lt;p&gt;Gran invento los VPS de OVH, excepcional rendimiento a precio inigualable y ahora que han activado el servicio de &lt;em&gt;snapshots&lt;/em&gt; no se puede pedir m&amp;aacute;s por &lt;em&gt;3&amp;euro;/mes&lt;/em&gt;. Pero como no me llevo comisi&amp;oacute;n, vamos al l&amp;iacute;o t&amp;eacute;cnico. Lo has empezado a usar, te ha molado y ahora el disco duro se te queda peque&amp;ntilde;o (&lt;em&gt;10Gb&lt;/em&gt; por defecto) as&amp;iacute; que decides cambiar el tipo de servidor a otro con m&amp;aacute;s disco... pero los cambios no se aplican autom&amp;aacute;gicamente como en otras veces... as&amp;iacute; que vamos a intentar arreglarlo.&lt;/p&gt;</description>
    </item>
    <item>
      <title>Postfix resolving /etc/hosts entries</title>
      <link>https://oscarmlage.com/posts/postfix-resolving-etchosts-entries/</link>
      <pubDate>Mon, 26 Oct 2015 21:52:30 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/postfix-resolving-etchosts-entries/</guid>
      <description>&lt;p&gt;Most of times when you are setting up a mail server you need to test that all is going fine. Well, in fact tests should happen *&lt;em&gt;after&lt;/em&gt;* the server is configured. Talking about an integral email solution (send + receive), some kind of tests come to my mind:&lt;/p&gt;</description>
    </item>
    <item>
      <title>OSX: Changing user shell</title>
      <link>https://oscarmlage.com/posts/osx-changing-user-shell/</link>
      <pubDate>Wed, 30 Sep 2015 08:12:04 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/osx-changing-user-shell/</guid>
      <description>&lt;p&gt;Today I&#39;ve tried to install &lt;a href=&#34;http://ohmyz.sh/&#34;&gt;Oh My ZSH!&lt;/a&gt; as default terminal and I&#39;ve resoundingly failed because of a color stuff. I knew I was not good with colors but I didn&#39;t know it would affect to terminals... The installation script inserted &#34;&lt;em&gt;/bin033[01;31m033[K/zsh033[m033[K&lt;/em&gt;&#34; as my default shell - &lt;em&gt;yep, with all that color crap&lt;/em&gt; - and, of course, that strange and colorful binary does not exist in my computer at all.&lt;/p&gt;</description>
    </item>
    <item>
      <title>Cron: variables based on command output</title>
      <link>https://oscarmlage.com/posts/cron-variables-based-command-output/</link>
      <pubDate>Fri, 18 Sep 2015 08:13:29 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/cron-variables-based-command-output/</guid>
      <description>&lt;p&gt;I had a problem with a cron job, a not-so-annoying but daily-repeating one. It&#39;s like a drill boring your mind slowly. Every time I got an email with the failing report the drill bit made more internal damage.&lt;/p&gt;</description>
    </item>
    <item>
      <title>Trick for the summer: the mifi router &#43; 3g data sim</title>
      <link>https://oscarmlage.com/posts/trick-summer-mifi-router-3g-data-sim/</link>
      <pubDate>Mon, 20 Jul 2015 13:08:34 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/trick-summer-mifi-router-3g-data-sim/</guid>
      <description>&lt;p&gt;As all the summers, we&#39;re trying to move from here to there enjoying the weather, beach, camping and all that stuff you can only take advantage of in this season.&lt;/p&gt;</description>
    </item>
    <item>
      <title>GPG: Revalidate expired key and add new email account</title>
      <link>https://oscarmlage.com/posts/gpg-revalidate-expired-key-and-add-new-email-account/</link>
      <pubDate>Sat, 05 Jul 2014 11:57:04 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/gpg-revalidate-expired-key-and-add-new-email-account/</guid>
      <description>&lt;p&gt;When you are creating a new GPG key you have to decide how long the key will be valid before to renew. In my case when I got my own key, I was not really thinking on use it daily, it was years ago, just for test and have fun.&lt;/p&gt;</description>
    </item>
    <item>
      <title>Logwatch, add a new postfix custom service</title>
      <link>https://oscarmlage.com/posts/logwatch-add-new-postfix-custom-service/</link>
      <pubDate>Sun, 08 Jun 2014 12:47:33 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/logwatch-add-new-postfix-custom-service/</guid>
      <description>&lt;p&gt;Last days ago I had lot of problems with&amp;nbsp;&lt;em&gt;MTA&lt;/em&gt;&amp;nbsp;servers,&amp;nbsp;&lt;a href=&#34;../../../../blog/postfix-deal-cracked-email-account.html&#34;&gt;hacked accounts&lt;/a&gt;, bad redirects policies and some other minor issues that kept me with the hands dirty in sysadmin keyboard. Needless to say how I love to put my&amp;nbsp;&lt;em&gt;sysadm hat&lt;/em&gt;&amp;nbsp;and start to fix and/or optimize stuff, so from that bunch of problems was born this little script that makes my days easier than before.&lt;/p&gt;</description>
    </item>
    <item>
      <title>Tmux: detach otras sesiones que no son la tuya</title>
      <link>https://oscarmlage.com/posts/tmux-detach-otras-sesiones-que-no-son-la-tuya/</link>
      <pubDate>Thu, 15 May 2014 04:11:47 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/tmux-detach-otras-sesiones-que-no-son-la-tuya/</guid>
      <description>&lt;p&gt;Una de las fant&amp;aacute;ticas features de &lt;a href=&#34;http://tmux.sourceforge.net/&#34;&gt;tmux&lt;/a&gt; es la sencillez con la que puedes conectar m&amp;uacute;ltiples clientes a la misma sesi&amp;oacute;n de forma simult&amp;aacute;nea. Si lo has hecho alguna vez, con terminales de diferentes tama&amp;ntilde;os, habr&amp;aacute;s visto algo tal que as&amp;iacute;:&lt;/p&gt;</description>
    </item>
    <item>
      <title>Apache: Alta carga de CPU</title>
      <link>https://oscarmlage.com/posts/apache-alta-carga-de-cpu/</link>
      <pubDate>Tue, 09 Aug 2011 10:27:52 +0000</pubDate><author>info@oscarmlage.com (oscarmlage)</author>
      <guid>https://oscarmlage.com/posts/apache-alta-carga-de-cpu/</guid>
      <description>&lt;p&gt;&#xA;&#x9;Llevo desde el fin de semana con la mosca detr&amp;aacute;s de la oreja. Uno de los servidores que administro ha visto incrementada de forma inexperada su carga media de CPU sin motivo aparente. Donde el &lt;em&gt;load average&lt;/em&gt; normal de 1 minuto variaba entre &lt;em&gt;0.40&lt;/em&gt; y &lt;em&gt;0.80&lt;/em&gt; de repente supon&amp;iacute;a cargas tan elevadas como &lt;em&gt;60&lt;/em&gt; o &lt;em&gt;100&lt;/em&gt; unidades.&lt;/p&gt;&#xA;&lt;p&gt;&#xA;&#x9;En esos momentos puntuales que llegaban a dejar la m&amp;aacute;quina &lt;em&gt;zombie&lt;/em&gt; el proceso que abarcaba un consumo de entre el &lt;em&gt;60%&lt;/em&gt; y el &lt;em&gt;90%&lt;/em&gt; de CPU era &lt;em&gt;apache2&lt;/em&gt;. Intrigante que ni &lt;em&gt;error.log&lt;/em&gt; ni &lt;em&gt;slow-queries.log&lt;/em&gt; de MySQL (lo que normalmente suele ser cuello de botella) dieran ninguna pista.</description>
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