There is a known error when your Nagios Monitoring Server is running Ubuntu 16.04 and you are trying to monitor a server with a newer version of Ubuntu like Ubuntu 18.04. In Ubuntu 18.04, NRPE uses a 2048 bit DH key, but in earlier versions of NRPE use a 512…
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:…
While generating a PDF from a dynamically created HTML file, I found that the PDF generation failed as there were non UTF-8 characters in the HTML file. To try and find these characters, I used the strings command with the -n 8 switch to remove any non UTF characters: I was…
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…
I was recently looking for a way of encrypting files with a salted encryption algruthum, and found this can be done using OpenSSL. It’s really easy and much more secure that using a zip product. You do this by using the following syntax: openssl des3 -salt -in /path/FileToBeEncrypted -out /path/EncryptedFileName…
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…
If the cdrom was not automatically mounted, mount the cdrom (in your guest OS) using the following commands: To install, run the following During vmware-install.pl, choose the default answers to everything (just hit the <enter> key). You can configure the tools using the following Reference https://help.ubuntu.com/community/VMware/Tools
To create a symbolic link use the command below: Example of creating a symbolic link called my.conf from a file called /var/test/myconfig.conf