Configure Postfix to Relay Mail to an External SMTP Server on CentOS 7

Posted on 09/04/2018 by Lisenet

The benefit of having two Postfix servers relaying email to an external SMTP server is redundancy. Continue reading →

Configure Peered NTP Servers on CentOS 7

Posted on 08/04/2018 by Lisenet

Configure NTP peering on CentOS 7. Continue reading →

Configure DHCP Failover with Dynamic DNS on CentOS 7

Posted on 07/04/2018 by Lisenet

We are going to set up a DHCP failover with dynamic DNS. Continue reading →

Configure Bind DNS Servers with Failover and Dynamic Updates on CentOS 7

Posted on 06/04/2018 by Lisenet

We are going to set up a DNS failover using Master/Slave configuration and configure dynamic updates. Continue reading →

Homelab Project with KVM, Katello and Puppet

Posted on 28/03/2018 by Lisenet

Setting up a highly available homelab with KVM, Katello and Puppet. Continue reading →

Basic Python Script to Log in to Website Using Selenium Webdriver

Posted on 21/12/2017 by Lisenet

Using Selenium for automated website testing.  Continue reading →

Analyse Cisco ASA Firewall Logs with Graylog

Posted on 18/12/2017 by Lisenet

We are going to use Graylog’s Grok patterns to extract information from Cisco ASA logs.  Continue reading →

Compile Apache Tomcat mod_jk on CentOS

Posted on 14/12/2017 by Lisenet

Installing mod_jk on Apache. Continue reading →

Monitoring Tomcat with Nagios Core and jmx4perl

Posted on 13/12/2017 by Lisenet

This articles serves as a reference for Nagios plugin check_jmx4perl and does not aim to provide any installation nor configuration instructions.  Continue reading →

Nagios Core Upgrade on CentOS 7

Posted on 09/12/2017 by Lisenet

We are going to upgrade Nagios Core from 4.1.1 to 4.3.4.  Continue reading →