Creating a SysLog Server with LogAnalyzer in CentOS 6 / RHEL 6

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The number of servers in our farm is continuing to grow. It’s becoming more and more difficult to monitor them all as closely as we would like. We decided that it’s time to set up as centralized location for log files to keep a closer eye on everything and allow us to easily develop our own reports and triggers against the logs. For this, we will be using rsyslog with a 3rd party program, LogAnalyzer. For the purposes of this document, we will assume that you already have a MySQL database configured running on a separate server.

Postfix Block Emails from Specific Domains CentOS 6 / RHEL 6

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As the battle to fight spam continues on the mail relay that serves our shared hosting services, we started working on a new way to stop spam from being sent. We have some customers who end up with compromised sites over and over again. These customers often don’t care that their site is infected get get irritated when we suspend their accounts. Some of them have asked us to simply remove email permissions from their accounts.

Installing vnstat Bandwidth Monitoring in CentOS 6 / RHEL 6

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One of the most important aspects of system administration these days is monitoring the traffic on your server. Many hosting providers impose limits on how much you can transfer per month. If you go over these limits, it’s not really a problem from the data center’s point of view, but you will usually end up getting slapped with a fee per GB you transfer in excess of your limits. This can add up quickly if you have a busy site.

Enabling SSL with MySQL Replication in CentOS 6 / RHEL 6

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We recently began using MySQL replication to handle our database backups. The reason we aren’t able to use mysqldump is because of the sheer size of our database. Our database consists of close to 1 million tables. Percona XtraBackup is able to back this up efficiently, but takes quite a while to run and causes a lot of disk io on the production server. The replicated instance resides on a separate physical server in a separate physical location. Everything works perfectly, except one thing… All the data is being transmitted in plain text! This document will walk you through installing SSL support on your server.