Category: Linux
Category: Linux

Configure OpenDKIM with Postfix

This article outlines the process that I use to configure OpenDKIM with Postfix. I will be using CentOS 7 for this article and assume that nothing has been installed on the OS. Install the EPEL Repository In order to configure OpenDKIM with Postfix, we must first install OpenDKIM. OpenDKIM is exposed to yum through the […]

Posted on December 12th, 2016
by Jeff

Zabbix Keeps Logging me Out

I recently ran into an issue while installing a new Zabbix server running Zabbix 3.2. After the installation, Zabbix would keep logging me out. I would authenticate, click the Administration tab, then receive an access denied message saying I’m logged in as a guest user. It turns out that the reason Zabbix keeps logging me […]

Posted on October 7th, 2016
by Jeff

pfSense Boot Loop

I just spun up a new pfSense install with the SG-4860 High availability bundle. Shortly after configuring the devices and rebooting the primary, I ended up with a pfSense boot loop. I was able to look at the pfSense boot loop messages by using my console cable and connect via PuTTY. Side note, while stuck […]

Posted on August 25th, 2015
by Jeff

Secure SSH With Public/Private Keys

This article will walk you through the setup to Secure SSH With Public/Private Keys and how to load them into PuTTY for easy SSH access. We will also cover the following Create a non-privileged user for SSH Create a new SSH Public and Private key pair for the new user Convert the private key to […]

Posted on July 15th, 2015
by Jeff

Z-Push ActiveSync Connection Error

I have been struggling with my Android 5 device and a Z-Push ActiveSync Connection error while trying to setup a new Exchange account. I was running Zimbra and Z-Push 2.1.2 without issues for almost a year. At one point, I realized that my ActiveSync account was throwing connection errors. I removed the account on my […]

Posted on January 29th, 2015
by Jeff

Apache Server Reached MaxClients Setting

Restored! Original Publish Date – June 24, 2011 Recently, one of our Apache web servers triggered an alert stating the HTTPD service was down with a Socket Error. Upon further investigation, I found the following line in our /var/log/httpd/error.log [Fri Jun 24 10:41:57 2011] [error] server reached MaxClients setting, consider raising the MaxClients setting The […]

Posted on June 6th, 2014
by Jeff

Calculating Disk IOPs on Linux

Restored! Original Publish Date – December 23, 2011 I’ve recently been playing around with Zabbix monitoring solution to replace Icinga. I really wanted to find a solution to monitor the IOPs on my Linux servers, all of which are virtualized on Citrix Xen Server. I have some test servers connected to an HP StorageWorks NAS […]

Posted on June 6th, 2014
by Jeff

Changing MTU of Bonded Interface within OpenFiler

Restored! Original Publish Date – September 5, 2012 I recently starting playing around with OpenFiler again. OpenFiler is a free SAN based linux distro that is really easy to use and configure. I installed OpenFiler on a Dell PowerEdge R710 2x146gb SAS drives and 6x 2TB 7200 SATA drives. I used the SAS drives for […]

Posted on June 6th, 2014
by Jeff

Check Apache Configuration Files for Errors

Restored! Original Publish Date – July 6, 2011 It is highly recommended that network admins check their httpd.conf file for errors after making changes and before restarting the service. The config files are checked, however, this check will prevent the service from starting if errors are found. All configuration files should be checked prior to […]

Posted on June 6th, 2014
by Jeff

OpenFiler Unable to Create new Partition GUI

Restored! Original Publish Date – September 5, 2012 I had a problem trying to create a second partition in my OpenFiler unit through the GUI. Everytime I clicked on the “Create” button, the page simply refreshed without creating a new partition. I stumbled up this great article and followed the instructions. Everything went well, except […]

Posted on June 6th, 2014
by Jeff