Top-level category for all posts/articles relating to Linux system administration.
I have an old Debian 7.11 box that needs an SSL certificate renewed. I want to replace the existing, manually installed certificate issued by Comodo. You can check the expiry date with something like: Given […]
When you attach a new storage device, you will need to first create a new partition and format it with a filesystem before you can make use of it. To view all attached devices, issue […]
Today I had a request to open a particular port. Once I’d put the required rule in place, I ran a port scan and found the port is still reporting as closed. This means either […]
To replace the default certificate, you first need to generate a certificate and matching private key. I did this against my Organisations CA. See here for more information on how to do that. First log […]
HP provides a command line utility called HPE Smart Storage Administrator (HPE SSACLI) used to configure, manage and monitor their RAID storage controllers. This application has changed its name over the years but is now […]
There are a number of tools that will allow you to generate secure passwords including urandom, OpenSSL, GPG and pwgen. I will briefly demo these below. OpenSSL The below generates a random string of 14 […]
Sometimes, when you’re testing your access to a website for example, it can be useful to change the IP address you appear to be coming from. Ordinarily, when you go to a website, the website […]
Here we create our own yum repository on a fresh up-to-date installation of Centos 7. Configure Nginx First install the EPEL repository. And then Nginx. Start and enable Nginx. Install and configure a local firewall. […]
Occasionally I need to find the usable IP address range given a particular CIDR notation. Usually I use an online calculator but today I found a better Linux based CLI tool, sipcalc, which save me […]
Today I finally found a bit of time to migrate my GitLab instance from one cloud provider to another. Following my own guide on how to migrate to a new instance, I began by installing […]
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