Design Patterns such as MVC above and Observer make software development a breeze! Or at least that is their goal, is to have standardized or well-known Design Patterns that has been refined by other developers, and shared out to the community in different locations (perhaps at Cisco Developer Code Exchange?) that Devs can use that … Continue reading DevNet Quick Notes – Design Patterns MVC and Observer, and BASH (Bourne Again Shell) review of commands and directory tree!
Time to do some GNS3 Switch Automation via Ansible on my Ubuntu Workstation VM! This is the Topology I threw together to begin with, the 3rd octect changes with Workstation NAT / DHCP on vmnet8, I still haven't figured it out but I'd rather spend time labbing. The Ubuntu "Ansible Control Node" and "AutoVM1" to … Continue reading Ansible and GNS3 – Configuring an “Ansible Inventory File” on my Ubuntu “Ansible Control Node” to setup a GNS3 / Ansible home lab!
As I work through the OCG, I will throw up notes on what I cover up to exam day! For more in depth explanations of the theory of topics I would refer to my "DevNet Class" articles for really in depth notes which are good to know, but I will be posting smaller and easy … Continue reading DevNet Quick Notes – SDLC, Waterfall / Lean / Agile Methods reviewed for exam day!
I remember Ansible pointing to Python 2.x being an issue last time as well, but I do a quick lab demo at the bottom to show I am all set to launch out of the dry walls of text, and back into the lab in the coming days / posts before I take my (now … Continue reading Ansible – Some basics / theory before diving into Ansible Labbing in VMware and a GNS3 Network!
I will pick up right where I left off from the previous Intro to Expert thread here! That being said, I will be looking at another noob feeling topic in depth! Python Sequence Types The 5 sequence types are as follow the (first 3 are actually built into Python): StringListTupleRangeBytes / Bytearray What is a … Continue reading Python 3 – Learning it properly this time from Hello World to Scripting, learning Python 3 from scratch Post #1 Completed – Session #2 begins!
Like other Linux distros, CentOS has the commands and tools to monitor a network. Before diving into the network monitoring I will show some changes that are made in CentOS 8 (and also RHEL 8). In CentOS 8 the default service to manage the network-related tasks is Network Manager. First I will show the connections … Continue reading Network Monitor in CentOS 8
Basically, ‘iptables’ is the packet filter system in RHEL systems. The best way to know what is ‘iptables’ is well written on the man page. In this article, I will show some simple and basic ‘iptables’ configurations. The three default chains in the iptables are Input, Forward, and Output. The ‘iptables –L’ command will show … Continue reading IPtables
Pictured above is an awesome CI/CD DevNet Sandbox that unfortunately glitched out! The CI/CD Pipeline Sandboxes seem glitch prone from my experiences tonight, which is not surprising given the complexity, however I will leave the lab up to the point Drone / Gogs glitched out as there was a basic getting it started guide which … Continue reading Cisco DevNet Sandbox for CI/CD, demo but unable to finish due to bug, thoughts on tools for labbing!
A fancy new Discord Server to collaborate / stream your lab / watch other stream! Being that I will be labbing my brains out on DevNet / Network Automation topics, I've created a discord server capable of Voice Channels which also allows for Video / Screen Sharing. I thought this would be a stellar idea … Continue reading New Loopedback Discord Server for Collaborating on labbing / Sharing your labbing / Saying Hello World!
This post will be covering all things Telephony for the DEVASC exam! This and "Compute" platforms (UCS Manager / Director / Intersight) will be the end review of my class, and really I am only going to be a high level overview of these, being its only 15% of the exam among a HUGE pool … Continue reading Week 6 of the DevNet Grind – CUCM / End User Data, Admin XML Layer (AXL), Contact Center / Finesse, and all things WebEx Teams!
Cisco Network Services Orchestrator (NSO) Cisco's Network Services Orchestrator is a platform to help companies transition into an SDN / Automated Network Solution, as the constant change in devices and limitation of vendor and service integrations has turned them away, where "Time to Market" requirements are critical as delays caused by new tool deployment will … Continue reading Week 6 of the DevNet Grind – Cisco Mgmt Platforms NSO and SD-WAN reviewed for exam day!
Network Automation and a list of the benefits it brings to Network Management Automation saves business operational expense (OPEX) when tasks can be automated, and before diving into the systems that bring this Automation at scale, wanted to review some the basic benefits it brings to the Enterprise Network: Device Provisioning - Automation makes device … Continue reading Week 6 of the DevNet Grind – Cisco Network Mgmt, IOS XE, Meraki, Difference in Data Planes, DNA Center, ACI, and NX-OS reviewed!
In this article, I will show how to make ssh tunnel to securely connect to the remote server. When we browse a website, the browser uses http to connect to a website. But http is not secure so without https it might cause a certificate issue. If the certificate is not trusted by the clients, … Continue reading SSH Tunnel Configuration in CentOS
The SDK (Software Development Kit) is the software toolbox for Developers! Unlike an API which is basically a set of URI's that are executed per the requirements of documentation used to help build them, SDK's are a set of tools for a specific device or system, often containing packages / integrated with libraries / documentation … Continue reading Week 6 of the DevNet Grind – SDK (Software Dev Kit) review of the different Cisco Platforms SDKs!
In this article, I am going to show how to configure SSH in a server to remotely connect to the client. First I will navigate to the .ssh directory. It is the directory where information about remotely connected devices is kept. For the client device, I will make a customized file and edit it. I … Continue reading SSH Configuration in CentOS