This post explains how to generate self signed certificates with SAN – Subject Alternative Names using openssl. It is a common but not very funny task, only a minute is needed when using this method.
The example below generates a certificate with two SubAltNames: mydomain.com and www.mydomain.com
Create openssl configuration file
Create configuration file for openssh (In a Linux … Read more
To configure passive checks in Nagios/icinga I use a tcp listener daemon that launches a script (See Nagios – Using passive checks without agent)
Tried to use inetd superserver daemon, but in the last versions, i have not been able to make it work correctly (See last update in my post: Linux – cannot found / missing inetd.conf)… Read more
This post shows the steps to create a multiboot cd with multiple Linux distributions or tools.
For example, I created a recovery / disaster case cd with the following tools:
– Clonezilla (to clone/recover disks and partitions)
– Gparted (partition editior with GUI)
– Trinity Rescue Kit (linux distribution for recovery and repair operations on Windows machines)
The Multicd … Read more
In certain scenarios it can be interesting or necessary to apply SNAT only to certain client IPs when accesing a virtual server to f.e. avoid assymetric routes, when the server gateway is not the F5… (take a look at this link for more examples).
These are the steps (im using BIG IP v13)…
Create a SNAT pool
I prefer the … Read more
Some time ago I started reading documentation about Raspberry. Nothing related to my job but, as a hobby/challenge, I decided to buy one and start a project in future posts I will talk about…
Also owner of a Raspberry? Follow this minitutorial to perform the basic installation of Raspbian OS with remote access enabled via SSH using WiFi connection.… Read more
Powershell can be very useful to extract data from our systems.
Excel can be very useful to show that data in a friendly way.
Powershell + Excel = Automatic generation of useful reports
These are the basic powershell sentences and functions needed to start generating our Excel reports using Powershell scripts:
Excel COM object
It is neccesary to reference a … Read more