Howtos / Articles

Get The Active DNS Servers On Linux

The Domain Name System (DNS for short) is one of the most important parts of the internet infrastructure. It converts the easy to remember domain names, into IP (and IPv6) addresses, that aren’t so friendly to the end user. Regardless of the distribution of Linux that you are using (such as Ubuntu, CentOS, Debian, Arch, Redhat, etc), the process of determining what DNS servers are currently being used for domain name resolution is the same. To determine what DNS servers…

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adding persistent static routes on ubuntu

When you need to access networks located on a different network segment, you need to have a route set up so the PC knows how to get to the other network segment. This generally just points to your main gateway, but you may want to set up additional static routes, where you don’t want the traffic going through your main default gateway. To set up a static route on Ubuntu so that it automatically gets created every time the PC…

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PHP FPM Unix Socket Error 13 Permission Denied After Updating Ubuntu

If you have a Ubuntu web server (running Ubuntu 14.04 LTS, 13.10, 12.04 LTS, or 10.04 LTS) set up using PHP FPM with Unix sockets, be warned that a recent security patch that fixes an issue with the PHP FPM socket permissions, may also break existing configurations, preventing your website from load php files. After this patch gets installed, you may find your unix socket now no longer accepts connections from your web server user, and you will see an…

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Synchronize the time on Ubuntu from a NTP Server

To synchronize the time on a Ubuntu computer, with the time from a NTP server, you can simply run the following command: sudo ntpdate 0.pool.ntp.org Replace “0.pool.ntp.org” with your NTP time server of choice. Example output: $ sudo ntpdate 0.pool.ntp.org 1 Jul 00:50:12 ntpdate[31843]: adjust time server 12.34.56.78 offset -0.001309 sec $ Your time will now be synchronized to the time from the NTP server. You can put this in a cron job to periodically update the time, to ensure…

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Change the Timezone in Ubuntu

To change the timezone on Ubuntu all you need to do is reconfigure the tzdata package. This can be done using the following command: sudo dpkg-reconfigure tzdata A menu prompt will then appear. Simply enter in your geographic area, and then the relevant city/timezone you want.…

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