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Daniel Kuchenski

115 posts

AWS Certified Advanced Networking in 20 Days

November 12, 2018 0 Comments aws, ans

Can the AWS Certified Advanced Networking Specialty exam be legitemately passed with only a few weeks of studying? Yes.

Is there a secret shortcut? No.

Although there is no shortcut, I will discuss my previous experience, study materials, and general impressions of the exam. If you have already been working with AWS networking, and wondering what it takes to be

Optimize Ruckus Configuration - Part 2

February 19, 2018 0 Comments ruckus

A couple years ago I posted how to Optimize Ruckus Configuration, and since then I've been continually tweaking so that my dense, multi-story WiFi environment performs well with Windows, Mac OSX, and mobile devices. Here are my current optimizations:

Note: This is based on Ruckus ZoneDirector 10.0.1.0 build 44

System Wide:

  • Channel Optimization: Optimize for Performance. This

AWS - CloudFormation - Create VPC

January 27, 2018 0 Comments aws, cloudformation

If you have worked with AWS networking, you know there is a laundry list of items that need to be initally configured so the environment is ready for use:

  • VPC
  • Internet Gateway
  • VPN Gateway
  • Public Subnets
  • Private Subnets
  • Public Route Tables
  • Private Route Tables
  • NAT Gateways
  • and more depending on your environment

Since AWS is a software defined cloud datacenter,

Ansible - BadHostKeyException

January 27, 2018 0 Comments ansible, cisco, ssh

When executing an ansible playbook, you may get the following error:

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: paramiko.BadHostKeyException: Host key for server switch-name does not match!

This probably happened after you changed the name of your network device, and generated new RSA keys. Or, if you are using DNS

Pluribus Networks - Whitebox Fabric #NFD16

November 03, 2017 0 Comments nfd16

On day two of Networking Field Day, Pluribus Networks gave us a rundown on what is possible with their Netvisor OS, whitebox hardware, and a distributed architecture. I was impressed with the flexibility of the solution, but like any design choice, there are some limitations to be aware of.

As a relative newcomer to the Pluribus world, I wanted to

Troubleshooting Disk Space Usage

October 16, 2017 0 Comments ubuntu

A couple years ago, my coworker wrote a great post on finding disk space issues in Linux and how to resolve them. Helped me out this weekend when a critical server was having issues, so wanted to post it here:

http://www.randomlyexpressed.com/diagnosing-linux-disk-usage/



For future reference (after reading the post above)

Show filesystem usage:

~$ df -h

Show all