Finding the new Disk Once the new physical or virtual hard drive has been installed on the system and is visible to the operating system. Once added, the new drive should automatically be detected by the operating system. Typically, the disk drives in a system are assigned device names beginning…
This post will walk you through setting up DKIM with Postfix on your Ubuntu 18.04, 20.04 or 22.04 Server. Setting up DKIM First, install OpenDKIM which is an open-source implementation of the DKIM sender authentication system. Then add postfix user to opendkim group. Edit OpenDKIM main configuration file. Uncomment the following lines. Replace simple with relaxed/simple. Then…
While I fully understand the security implications of running these legacy and unsupported versions of PHP and MySQL. I had an application that had these dependancies, but I wanted to move to a supported LTS version of Ubuntu. Once you have Ubuntu 18.04 installed with Apache 2, you can use…
One common configuration issue with Nagios 3 running on Ubuntu is getting the Service Commands menu to work correctly in the web portal. By default, it is visible in the UI, but disabled on the server backend. In Ubuntu, you will recieve the cryptic error Could not stat() command file pointing to /var/lib/nagios3/rw/nagios.cmd. This can…
I had an issue today where a Linux VM’s file system was read only after a SAN issue. When a Linux server like Ubuntu looses access to its disks, the file system can go into read only to protect it from corruption. To resolve this you will need to run the following command:…
By default the nagiosadmin account is one you login to the web interface with. To add your own users, you can follow these commands: Add user to the htpasswd file Next edit the Nagios cgi.cfg file to grant the relevant permissions: I wanted to same level of access as nagiosadmin,…
Logging To setup logging in Bind 9 you will need to complete the following: First configure logging in your named.conf.options file Add this at the bottom of the file: Now create a directory for the logs. Unless you edit your /etc/apparmor.d/usr.sbin.named, you will have to use the default directory of…
On the master server install bind server and bind utilities: Once bind has been installed, you need to setup the zones you will be hosting. In this example, domain.com is your domain name, 60.60.20.15 is the IP address or your slave server, and 50.50.20.15 is the IP address of your…
When you use a proxy server, your traffic can be detected as coming via a proxy by sites like Hulu. If you are running squid3, the you can stop this detection by adding the following lines to your config file Add the following to the file You can now test…
UFW a firewall configuration tool available on Ubuntu. UFW provides a user friendly way to create an IPv4 and IPv6 ip/port based firewall rules. By default UFW is disabled, it can be enabled by running the following. Please ensure you have firewall rules in place to allow SSH before you enable…