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F5 GTM – DNS Query Processing Order

May 31, 2017 mavenetLeave a comment

When a DNS query arrives at a F5 GTM/DNS, this is the processing order for the DNS query. 1 – DNS Query is processed by the Listener. 2- If Recursion Desired (RD) flag is set in the incoming query and if the DNS Profile associated … “F5 GTM – DNS Query Processing Order”

Ansible Playbook Optimizing

April 19, 2017April 20, 2017 mavenetLeave a comment

$ cat ansible.cfg [defaults] hostfile = ./hosts host_key_checking = False timeout = 5 log_path = ./logfile.txt forks = 50 gathering = smart [ssh_connection] pipelining = True The above file shows the content of ansible.cfg file. I have added the following to make my playbook run … “Ansible Playbook Optimizing”

Ansible & Python 3

April 10, 2017 mavenetLeave a comment

While using Ansible 2.2 and Python 3.x, I ran into the following error: ERROR! Unexpected Exception: No module named ‘urlparse’ Workaround: 1. Downgrade Python to 2.x 2. If there is no root level permission, use virtual env: virtualenv –python=python2.7

Terraform in Ubuntu

April 07, 2017April 22, 2017 mavenetLeave a comment

I have utilized the following steps to install terraform in Ubuntu 16.04 Download Terraform for Linux 64 bit version. Save the downloaded version in a specific folder. (Example: /home/user/terra) Within the folder where the downloaded version is saved, use “unzip” command: unzip terraform Set the … “Terraform in Ubuntu”

iRule HTTP Referer

April 03, 2017 mavenetLeave a comment

This is a simple iRule that performs redirects based on HTTP Referer: when HTTP_REQUEST { if { ([HTTP::header exists “Referer”]) and ([URI::host [HTTP::header value Referer]] eq”special.com”) } { HTTP::redirect https://www.site.com/special-client/ } else { HTTP::redirect https://www.site.com/generic-client } }

Ansible Components

March 30, 2017April 03, 2017 mavenetLeave a comment

What? Ansible is a simple IT automation tool. Ansible exists as CLI & GUI. GUI is called the Ansible Tower and Ansible, Inc., which is owned by RedHat, officially supports this. Controlling Nodes: The Network infrastructure is managed from these Controlling Nodes. In an Enterprise environment, Controlling … “Ansible Components”

F5 Logs

March 21, 2017April 25, 2017 mavenetLeave a comment

F5 logs are available under /var/log/ directory. If you are looking for LTM traffic related logs, look under /var/log/ltm If you are looking for GTM traffic related logs, look under /var/log/gtm GTM has been renamed as DNS from 12.x code version. The logs are rotated … “F5 Logs”

Kubernetes Intro

March 18, 2017 mavenetLeave a comment

Kubernetes is Greek for Pilot or Helmsman. It is primarily used as an orchestration tool for containers. Kubernetes Deployment (KD): Deployment is responsible for creating and updating instances of application. Kubernetes Master (KM): KM schedule the application instances that was created by the KD onto … “Kubernetes Intro”

Thoughts on F5 Deployment

March 17, 2017 mavenet1 Comment

This is a simplified check list for GTM & LTM deployment based on my experience. Don’t deploy GTM in HA pair in a single DC: GTM devices work in a synchronization group across geographic regions. If you deploy GTM-1 in DC-1 and GTM-2 in DC-2, … “Thoughts on F5 Deployment”

F5 TMM Crash

March 12, 2017 mavenetLeave a comment

We were using a DNS VS listening on port 53 but configured to handle TCP protocol as shown here: ltm virtual /Common/VS_DNS { destination /Common/10.10.10.10:53 ip-protocol tcp mask 255.255.255.255 pool /Common/pool_dns profiles { /Common/tcp { } } source 0.0.0.0/0 source-address-translation { pool /Common/SNAT-10.10.10.10 type snat … “F5 TMM Crash”