Automating responses to scripts on Linux using expect and autoexpect

The Linux expect command takes script writing to an entirely new level. Instead of automating processes, it automates running and responding to other scripts. In other words, you can write a script that asks how you are and then create an expect script that both runs it and tells it that you're ok.Here's the bash script:#!/bin/bash echo "How are you doing?" read ans [Get regularly scheduled insights by signing up for Network World newsletters.] Here's the expect script that provides the response to the query:#!/usr/bin/expect set timeout -1 spawn ./ask # ask is name of script to be run expect "How are you doing?\r" send -- "ok\r" expect eof When you run the script, you should see this:To read this article in full, please click here

Network Break 315: Pluralsight Sold For $3.5 Billion; Dent NOS Hitchhikes To The Edge

This week's Network Break discusses the jaw-dropping $3.5 billion purchase of Pluralsight; welcomes a new network OS to life, the universe, and everything; debates whether ICANN was cautious or tardy in implementing DNSSEC for gTLD name servers, catches up on the SolarWinds hack, and more tech conversation.

The post Network Break 315: Pluralsight Sold For $3.5 Billion; Dent NOS Hitchhikes To The Edge appeared first on Packet Pushers.

Protecting Workloads with Global Network Backing Using Site Recovery Manager

Many thanks to Dimitri Desmidt from VMware, NSBU for providing the Design details of Multi-Location and Federation.

Preface

Starting NSX-T version 3.0.2 workloads with NSX-T global network backing (L2 stretched segment) can be protected and recovered using Site Recovery Manager (SRM). More details on Multi-Locations with Federation are available here.

Note: This post does not contain the installation and configuration details of NSX-T federation, vSphere Replication and Site Recovery Manager. Hence, it is necessary to meet the following pre-requisite to achieve the goal of protecting workloads with global segments using SRM.

Pre-requisite

  • Understanding of NSX-T Federation and its configuration is necessary.
  • Understanding the installation and configuration of vSphere Replication and Site Recovery Manager (SRM) is necessary.

Limitations

SRM is not currently supported with Federation with VM Tags, Segment Ports, or Segment Ports Tags. As mentioned in the Design Guide for Multi-Locations here:

  • Currently recovered VMs via SRM does not recover their NSX VM Tags.
  • Recovered VMs will receive new Segment Ports on the new LM.
  • If the Federation Security is based on VM Tags, Segment Ports or Segment Ports Tags then the recovered compute VMs in another location (London in our example here) do not have their Continue reading

Give The Network Designer That Came Before You A Break

When you take over a network as a technical lead, you often run into design elements that make you do a spit-take. They did WHAT? Really? Were they...stupid? Clueless? Stupid AND clueless? Maybe they were, but I argue that you should give those humans that came before you a break. You weren't there. You don't know what constraints they were operating under. Since you don't know those things, it's hard to pass fair judgement. Unfair judgement? Oh, yeah. All day long, and you can even feel righteous while doing so. Super smug.

The post Give The Network Designer That Came Before You A Break appeared first on Packet Pushers.

Understanding GNS3 Appliances – Video

The labbing tool GNS3 has a capability called “appliances” but it may not mean what you think it means. GNS3 co-founder and developer Jeremy Grossman and networking instructor David Bombal talk with Ethan Banks about what appliances mean in the context of this software. You can listen to the full episode, “Heavy Networking 556: The […]

The post Understanding GNS3 Appliances – Video appeared first on Packet Pushers.

Tech Bytes: SD-WAN Helps Medical Imaging Company Get The Picture Faster (Sponsored)

This Tech Bytes podcast explores how SimonMed, a medical imaging company, turned to an SD-WAN deployment from Silver Peak to reduce image delivery time from minutes to seconds, improve performance of VoIP, and begin a migration from expensive MPLS circuits.

The post Tech Bytes: SD-WAN Helps Medical Imaging Company Get The Picture Faster (Sponsored) appeared first on Packet Pushers.

Who Shoulders the Supercomputing Resiliency Burden?

While the related topics of fault tolerance and resiliency do not garner the same attention as performance and efficiency, being able to recover from and work around failures, especially as applications take over ever-large and increasingly heterogenous machines, is more important than ever. …

Who Shoulders the Supercomputing Resiliency Burden? was written by Nicole Hemsoth at The Next Platform.

Using Velero to Protect Cluster API

Cluster API (also known as CAPI) is, as you may already know, an effort within the upstream Kubernetes community to apply Kubernetes-style APIs to cluster lifecycle management—in short, to use Kubernetes to manage the lifecycle of Kubernetes clusters. If you’re unfamiliar with CAPI, I’d encourage you to check out my introduction to Cluster API before proceeding. In this post, I’m going to show you how to use Velero (formerly Heptio Ark) to backup and restore Cluster API objects so as to protect your organization against an unrecoverable issue on your Cluster API management cluster.

To be honest, this process is so straightforward it almost doesn’t need to be explained. In general, the process for backing up the CAPI management cluster looks like this:

  1. Pause CAPI reconciliation on the management cluster.
  2. Back up the CAPI resources.
  3. Resume CAPI reconciliation.

In the event of catastrophic failure, the recovery process looks like this:

  1. Restore from backup onto another management cluster.
  2. Resume CAPI reconciliation.

Let’s look at these steps in a bit more detail.

Pausing and Resuming Reconciliation

The process for pausing and resuming reconciliation of CAPI resources is outlined in this separate blog post. To summarize that post here for convenience, the Cluster Continue reading

Webinars in 2021

After deciding to take a slightly longer coffee break I went through the list of outstanding projects trying to figure out which ones I could complete in first half of 2021, which ones I’ll get to “eventually” and what’s a lost cause.

Guest Speakers

Irena is telling me that I should stop inviting guest speakers – our calendar is full until June 2021. Here’s what we have planned and what we got done at the time of the last update (January 30, 2021).

Read more …

The Week in Internet News: U.K. Investigating Google Chrome’s Privacy Push

No more cookies: Google’s Chrome browser has announced a plan to replace tracking cookies with a system that shares less information with advertisers, but the U.K.’s Competition and Markets Authority is worried that more user privacy would have a “significant impact” on news websites and on the digital advertising market, the BBC reports. The agency has warned that publishers’ profits could drop if they no longer run personalized advertisements.

A vulgar display of content: The Chinese National Office Against Pornographic and Illegal Publications has fined short video app Douyin, a sister app to TikTok, for spreading “obscene, pornographic and vulgar information,” the South China Morning Post says. The app was fined “tens of thousands of yuan,” the regulator said. Regulators said they received more than 900 reports related to pornographic and vulgar content on Douyin in the past year.

The sports car Internet: Gigabit Internet service is coming to rural Kansas and Missouri with funding from the Federal Communications Commission’s Rural Digital Opportunity Fund, FlatlandKC.org reports. The site compared gigabit speeds to a fast sports car. The FCC has selected 180 winning bidders to receive $9.2 billion in funding to provide increased Internet access to 5.2 million Continue reading

Save the Date for DockerCon Live 2021!

As the calendar leaves 2020 in the rear view mirror, we’re looking forward to the year ahead. And as part of this, today we’re announcing the dates for DockerCon Live 2021. DockerCon Live will take place on May 27th, 2021. Sign up here to pre-register for the event!

Once again, DockerCon Live will be a free, online experience full of demos of products and innovation from Docker and our partners. You’ll get deep technical sessions from Docker experts, Docker Captains and luminaries from across the industry, along with a chance for the community to gather and connect with colleagues around the world.

Last year DockerCon Live 2020 was one of the largest events in the app dev industry–  over 80,000 developers from 193 countries registered to hear over 50 sessions focused on best practices, real world techniques and how-to instruction for building containerized cloud-native solutions with Docker. Speakers joined from companies such as AWS, Google, Microsoft, Salesforce, Nginx, Snyk, Datadog, LaunchDarkly, among others.

For 2021, we are building on this format with a couple of new features including full day pre-conference technical workshops, additional content and more community activities. And there will be some surprises for everyone involved. If you Continue reading

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