Introduction to YAML

Introduction

YAML, previously known as Yet Another Markup Language, but now YAML Ain’t Markup Language, is a human friendly data serialization standard for programming languages.

YAML and JSON, JavaScript Object Notation, are related to each other, where YAML, according to YAML 1.2 specification, is a superset of JSON.

YAML supports using scalars, sequences, and mappings. A scalar is a string, a number, or boolean, a sequence is a list, and a mapping is a key/value pair.

YAML is commonly used by configuration files in open source tools and Ansible, a network automation tool, uses YAML to run its playbooks.

When it comes to YAML syntax, be aware of the following:

  • Indentation matters!
    • Tabs aren’t allowed
    • Normally two spaces used when indenting
  • A single YAML file may contain multiple documents
    • Every document starts with three dashes
  • YAML is case sensitive

Scalars

Scalars are single values. It can be a string, number, or a boolean value. Strings don’t need to be quoted, except for some special cases:

  • The string starts with a special character
    • !#%@&*`?|>{[ or –
  • The string starts or ends with whitespace characters
  • The string contains : or # character sequences
  • The string ends with a Continue reading

GNMI. Part 4. Configuring Arista EOS and Nokia SR OS with gRPC/gNMI and OpenConfig/YANG.

Hello my friend,

We have received a lot of positive feedbacks in the social media regarding our previous post about collecting info from Nokia SR OS and Arista EOS using gRPC/gNMI. Thank you! Today we will cover the configuration part; hence, you will learn how to configure Arista EOS and Nokia SR OS using the gRPC transport with gNMI specification and OpenConfig YANG modules.



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Start your network automation journey

Just in two weeks we start the new network automation training! This time we have ever biggest agenda with all the cutting edge technologies (NETCONF, REST API, gNMI), data models (YANG, Protobuf, JSON, XML, YAML), vendors (Cisco, Nokia, Arista, Cumulus) and a lot of programming (Ansible, Python, Bash) salted with Linux administration, virtualisation, containerisation and many more

Join the industry-best network automation training.

In one place you will learn all the technologies and tolls you need to start or improve your career in the world of the Continue reading

Open networking post Nvidia-Mellanox-Cumulus acquisition

Subscribe to Kernel of Truth on iTunes, Google Play, Spotify, Cast Box and Sticher!

Click here for our previous episode.

With the recent acquisition of Cumulus Networks by Nvidia, what does that mean for open networking? Kernel of Truth host Roopa Prabhu is joined by Partho Mishra and Amit Katz to discuss what does the acquisition mean for the future of accelerated data center and for open networking in the data center. This is a must listen episode!

Guest Bios

Roopa Prabhu: Roopa Prabhu is Chief Linux Architect at Cumulus Networks. At Cumulus she and her team work on all things kernel networking and Linux system infrastructure areas. Her primary focus areas in the Linux kernel are Linux bridge, Netlink, VxLAN, Lightweight tunnels. She is currently focused on building Linux kernel dataplane for E-VPN. She loves working at Cumulus and with the Linux kernel networking and debian communities. Her past experience includes Linux clusters, ethernet drivers and Linux KVM virtualization platforms. She has a BS and MS in Computer Science. You can find her on Twitter at @__roopa.

Amit Katz: Amit is Vice President Ethernet Switch at Mellanox, Nvidia Business Unit. Amit served as Senior Director of Continue reading

SDxCentral Condemns the Murder of George Floyd

SDxCentral also condemns police brutality and the rash of racially motivated murders of the black,...

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Maxie McCoy: Work Will Never Be the Same

Workplace expert Maxie McCoy says the COVID-19 era has changed almost everything about the office,...

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Daily Roundup: Plug Pulled on Cisco Live

Cisco Live postposed in light of recent events; Dell, VMware supercharged AI; and Chipmakers...

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© SDxCentral, LLC. Use of this feed is limited to personal, non-commercial use and is governed by SDxCentral's Terms of Use (https://www.sdxcentral.com/legal/terms-of-service/). Publishing this feed for public or commercial use and/or misrepresentation by a third party is prohibited.

Cyberattacks since the murder of George Floyd

Cyberattacks since the murder of George Floyd

As we’ve often seen in the past, real world protest and violence is usually accompanied by attacks on the Internet. This past week has been no exception. The shocking murder of George Floyd on May 25 was followed, over the weekend of May 30/31, by widespread protests and violence in the US. At the same time, Cloudflare saw a large uptick in cyberattacks, particularly cyberattacks on advocacy organizations fighting racism.

This chart shows the number of cyberattack HTTP requests blocked by Cloudflare over the last week (blue line) compared to the corresponding week in April a month before (green line). Cloudflare’s scale means that we are blocking attacks in the many 10s of billions per day, but even with that scale it’s clear that during the last week there have been even more attacks than before. And those attacks grew over the weekend.

Cyberattacks since the murder of George Floyd

Digging in a little deeper we can compare the attacks over this past weekend with a corresponding weekend a month before. Over the weekend of April 25/26, Cloudflare blocked a total of 116,317,347,341 (a little over 116 billion cyberattack HTTP requests performing DDoS or trying to break into websites, apps or APIs were blocked).

Since 116,317,347,341 can Continue reading

Veeam Data Report: Legacy Is Out, Cloud Services Are In

Fear not slow migrators, legacy technologies are not obsolete – yet. 

© SDxCentral, LLC. Use of this feed is limited to personal, non-commercial use and is governed by SDxCentral's Terms of Use (https://www.sdxcentral.com/legal/terms-of-service/). Publishing this feed for public or commercial use and/or misrepresentation by a third party is prohibited.

COVID-19 Response Must Include Massive Funding for Fiber-Optic Internet Access

By now, many of us are realizing we’ve been taking access to basic things for granted, such as social interaction, health care, on-site education, and…the Internet. While always valuable, the Internet is now a lifeline offering a fortunate few the ability to adapt and maintain a semblance of reality and connection to our employment, health services, and our family and friends. But those who don’t have access to fast, reliable broadband Internet are experiencing the pain of staying at home. Last year, an analysis by Microsoft indicated that 162.8 million Americans aren’t able to use the Internet at broadband speeds. That’s unacceptable, and while there are steps that communities continue to take to build their own networks, Congress needs to lead by taking steps to ensure that broadband access is available at an affordable price to all Americans.

While some cities and states have begun to relax orders, our return to normal life is still a long way off.

Congress took the first important step with the CARES Act, but it did not go far enough. The HEROES Act and the COVID-19 DISASTER in Indian Country Act are a more serious step toward addressing the connectivity needs of localities, and we applaud these Congressional actions. Now, it is time to move this critical legislation Continue reading

Cisco warns of Nexus switch security weakness

Cisco is telling customers of its Nexus core data-center switches to fix or work around a vulnerability that could leave the boxes open to a denial of service attack.The vulnerability, found in the Nexus NX-OS software gets a 8.6 score out of 10 on the Common Vulnerability Scoring System, making it a “High” risk problem.Cisco said the vulnerability is due to an affected device unexpectedly decapsulating and processing IP-in-IP packets that are destined to a locally configured IP address. IP in IP is a tunneling protocol that wraps an IP packet within another IP packet.To read this article in full, please click here

A tiny experimental optical chip can support downloads of 1,000 movies in a split second

An optical chip the size of a fingernail has enabled Australian researchers to set new optical data rate records on the country’s National Broadband Network (NBN).The raw data rate of 44.2Tbps over conventional optical cable is about three times the data rate for the entire NBN network and about 100 times the speed of any single device currently used on the network, the researchers say.10 of the world's fastest supercomputers While the technology is meant for metro-area networks and data centers, those bit rates would support downloads of 1,000 movies in less than a second.To read this article in full, please click here

Heavy Networking 520: Cloud Architects’ Multi-Cloud Network Adoption With Alkira (Sponsored)

Today's Heavy Networking, sponsored by Alkira, dives into multi-cloud networking. Alkira's Cloud Service Exchange is an on-demand, as-a-service offering that lets customers deploy multi-cloud networks with integrated security services using an intuitive digital design canvas. We talk with two Alkira customers using the service, as well as with Alkira co-founder and CTO Atif Khan.

Heavy Networking 520: Cloud Architects’ Multi-Cloud Network Adoption With Alkira (Sponsored)

Today's Heavy Networking, sponsored by Alkira, dives into multi-cloud networking. Alkira's Cloud Service Exchange is an on-demand, as-a-service offering that lets customers deploy multi-cloud networks with integrated security services using an intuitive digital design canvas. We talk with two Alkira customers using the service, as well as with Alkira co-founder and CTO Atif Khan.

The post Heavy Networking 520: Cloud Architects’ Multi-Cloud Network Adoption With Alkira (Sponsored) appeared first on Packet Pushers.

In a Time of Crisis, A Global Lockdown Needs a Digital Unlocking

We are at a very special moment in history right now. Never before in modern times have we seen such a global impact and a global response to a crisis which largely ignores geopolitical borders. The COVID-19 outbreak and its repercussions have put cities, countries, entire regions on hold.

One saving grace of this crisis is that the global digital infrastructure – the terrestrial and mobile networks, the data centers, the undersea cables, and the satellite connections that support the global Internet – is by now well enough developed for people in many countries to stay in constant contact despite isolation.

This means that, today, lockdown does not necessarily need to mean shut down.

Digital applications are key to enduring the crisis

Digital communication is vital to this. It enables companies to send their workforce home to work. It enables people to stay in contact with loved ones they can’t meet with. It enables children and students of all ages to continue with their education. Even the researchers who we all pin our hopes on finding a vaccine are using digital applications to remain in contact and share data in their efforts to understand the virus.

So digital applications that Continue reading

SD-WAN Security: A Product Liability Insurance Law Would Certainly Help

On May 14th 2020, Marcel Gamma, tech industry journalist, and editor-in-chief at inside-it.ch and inside-channels.ch, published an article discussing several glaring security vulnerabilities in Silver Peak’s SD-WAN products on inside-it.ch. The original article was written in German; Marcel was kind enough to translate it into English and get permission from his publisher to have the English version published on ipSpace.net.

Security researchers make serious accusations against SD-Wan manufacturer Silver Peak. The latter disagrees. Swiss experts are analyzing the case.

By Marcel Gamma,

Silver Peak is accused of laxity in dealing with security issues and in dealing with security researchers who act within the framework of Responsible Disclosure.

Read more …
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