Hardware icon   HW – Upgrade laptop with an SSD drive



One of the biggest bottlenecks regarding the performance of a laptop is disk access. Therefore, installing an SSD (Solid State Drive) is a fantastic way to speed it up. It is a great feeling to see how fast Windows or any program starts after installing it. The only disadvantage is the price of this type of disks, but currently, … Read more

Windows   Windows – VMware machines offline due to Microsoft patches



Today, just when starting the working day we have realized that there were somes servers offline (still powered on but without network connection). It seemed that the network adapters were incorrectly configured without the static IPs.

After some research, a job partner discovered that some days ago (March 13th) Microsoft released some security updates that generates issues to Windows 2008 Read more

F5 BIG-IP icon   F5 BIGIP – Upgrade an active/standby cluster



Step by step procedure to upgrade an active/standby BIGIP cluster. In this example, I needed to upgrade from BIG IP v13.0.0.0 to v13.1.0.2

Download

Login to https://downloads.f5.com/, search and download the ISO image of the version you want to upgrade to.
F5 BIGIP - Upgrade an activestandby cluster - Download BIGIP upgrade

F5 BIGIP - Upgrade an activestandby cluster - Download BIGIP upgrade

Export configuration

As a good sysadmin practice, it is better to export the configuration of both nodes … Read more

F5 BIG-IP icon   F5 BIGIP – LTM Policy GUI incorrectly shows conditions with datagroups



The last F5 BIGIP version 13.1.0.2 (I upgraded from v13.0.0 some days ago – 2018 February) seems to generate a bug with the LTM policies.

Symptoms

Fortunately, the issue is only at the Presentation layer. The LTM policy show the rules conditions always with datagroups. This affects all rules and policies.

Better explained with an example:
If this is a … Read more

F5 BIG-IP icon   F5 BIGIP – HTTP header count exceeded maximum allowed count



Last week we published a new application on our web servers (which are balanced by the F5 BIGIP)
Accessing directly to the servers produced no problem, but when the connection was through the virtual balancing IP of the F5, the application did not work correctly.

Error message

Fortunately, monitoring the LTM module logs of the F5 (/var/log/ltm) while the problem … Read more

Security   Security – Create self signed SAN certificate with OpenSSL



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

Icinga icon   Icinga – Cannot login to Grafana. Forgot admin password



It is not the first time my Icinga suddenlty, stops showing the grafana graphs.
Icinga when cannot show Grafana graphs

Problem

If trying to log to Grafana, admin password is not accepted. I am pretty sure i have not changed the password but I am unable to login to Grafana.
Invalid username or password when login to Grafana
And even worse, given that I still have not configured Grafana SMTP section / admin … Read more

Icinga icon   Icinga2 – Understanding checks and notification types



Here I am trying to present (I hope in an easy way to understand) some Icinga concepts (maybe also applicable in Nagios) like active and passive checks, enabling and disabling freshness checks, soft and hard states,… and the related parameters to configure them.

ACTIVE and PASSIVE services

There are two types of services:

  • ACTIVE: Check initiated by the Icinga
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Checkpoint   Checkpoint – GAIA commands to check backup status and logs



I have configured my VSX appliances to perfom scheduled backups every week. Today, my icinga monitoring system has raised an alert informing that VSX2 backup has failed.

Icinga monitoring checkpoint VSX backups

GAIA provides some commands to get useful data about the execution of the backup processes.

last-successful

Show the the latest successful backup

vsx2:0> show backup last-successful
Backup Type: local ( latest )
Backup 
Read more