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A chef-client is an agent that runs locally on every node that is under management by Chef. The chef-client executable can be run as a daemon. When a chef-client is run, it will perform all of the steps that are required to bring the node into the expected state, including:

Registering and authenticating the node with the Chef server
Building the node object
Synchronizing cookbooks
Compiling the resource collection by loading each of the required cookbooks, including recipes, attributes, and all other dependencies
Taking the appropriate and required actions to configure the node
Looking for exceptions and notifications, handling each as required

RSA public key-pairs are used to authenticate the chef-client with the Chef server every time a chef-client needs access to data that is stored on the Chef server. This prevents any node from accessing data that it shouldn’t and it ensures that only nodes that are properly registered with the Chef server can be managed.

Ohai

Ohai is a tool that is used to collect system configuration data, which is provided to the chef-client for use within cookbooks. Ohai is run by the chef-client at the beginning of every Chef run to determine system state. Ohai includes many built-in plugins to detect common configuration details as well as a plugin model for writing custom plugins.

The types of attributes Ohai collects include but are not limited to:

Operating System
Network
Memory
Disk
CPU
Kernel
Host names
Fully qualified domain names
Virtualization
Cloud provider metadata

Attributes that are collected by Ohai are automatic level attributes, in that these attributes are used by the chef-client to ensure that these attributes remain unchanged after the chef-client is done configuring the node.

Ohai collects data for many platforms, including AIX, Darwin, Linux, FreeBSD, OpenBSD, NetBSD, Solaris, and any Microsoft Windows operating systems.

Reference
https://docs.chef.io/chef_client.html

Tagged : Chef / Chef Client / Chef Internal / Chef Tutorials / How / Ohai / Resources

Top 10 DevOps Online Resources to learn, share and practice.

by scmgalaxy KJanuary 23, 2017February 27, 2021DevOps Community / WebsitesLeave a Comment

DevOps is a hot topic these days among-st IT professionals and when you as a student or professional who is related to this industry go to Google and search about “DevOps” you get (About 1,55,00,000 results (0.42 seconds)) results. So, this is not a tough job to find DevOps related resources. But when you need to find best resources for DevOps learning, practicing and want to surround yourself with DevOps like minded people than it is really a tough job to find. So, Let me make this task easy for you. I did some research and made lists of Top 10 DevOps resources where you can learn, practice, share, discuss and get latest updates and news online about DevOps.

So, Here is the list of top 10 DevOps resources, Just explore

1. scmGalaxy

scmGalaxy is a one stop portal for DevOps learning where you can find DevOps tutorials, DevOps courses, certifications, trainers, study materials and much more all in one place. They are the largest scm, DevOps, Build & Release community worldwide. They have well designed DevOps courses and certification programs and well known dedicated DevOps trainers which will help you to become best DevOps engineers. scmGalaxy provide all there services for many citites and countries in the world, some of them are Hyderabad, Bangalore, London, Amsterdam, Mumbai, Singapore, san francisco, Europe, Australia etc. They give there participants life time access for there tutorials and they can attend future classes without any extra charges even after completing there training. I also checked scmGalaxy reviews and testimonials on various platforms like FB, Linkedin, YouTube and on other paltforms too and after reading that I can say that they are one of the best resources for DevOps learning and deserve to be in our list.

2. DevOps School

DevOps school is also amongst those who provide training and certification for DevOps courses. But why do I keep it in my list? The reason is when you go there website the first thing which will be noticed, there tutorials tab, which shows there wish to help participants with DevOps related issues which can be acccessed without any charges. Isn,t it great? DevOps school also provides quizes, videos, assignments, courses, training and certifications for DevOps. I checked there reviews and testimonials on various paltforms find there services spotless. The participants who attended there training sessions reviewed them one of the best schools for DevOps training.

3. BestDevOps

If you want yourself to be the first to get updated with latest DevOps related news than this is the paltform. BestDevOps is a DevOps updates and news platform where you can read about DevOps related updates, events, news, tutorials, tips and much more. This platform is quite new but when you browse you can find lots of DevOps content which will be very helpful if you are a DevOps enthusiast. They update on regular basis with authentcity. You don’t need to go anywhere else or in google for search just give few minutes to this portal and you can have all the updates for the day.

4. DevOpso

DevOpso is a community based website which provides space to devops practitioners to share their stories, practices, discussions and tips around the world. This platform is very active with DevOps experts. You can find solutions and can do discussions on DevOps related topics with members just by joining this platform. I browsed there site and find there are a lot of DevOps related issues posted there and community members come up with some great solutions. I can say this community site should be in your list if you want to surround yourself with DevOps like minded peoples.

5. Linkedin Group

Linkdin as we all know, this is a place where you can find all professional networks. So this lnkedin group is also one of the place where you can get connnected with DevOps peoples. In this linkedin group, there are many highly active members who frequently respond to discussions, post the latest DevOps articles and blog posts, and who are welcoming towards new members of the group.

6. Facebook Group

Facebook which does not need any introduction, as it is a leading social media platform worldwide. So here you can also surround yourself with DevOps professionals and practitioners. This facebook group is one of the leading DevOps group you can join and get updated with DevOps posts, articles, tips and do discussion on DevOps topics with active members around the globe.

7. Google Group

Google groups are also one of the place where you can join DevOps practioners online. You can join this group which is one of the most popular DevOps group and continuously growing with new members globally. It’s shows that members gets here quality content on DevOps. You can find webinars, Demo sessions, tips, articles and much more in this group.

8. AWS Amazon

Amazon AWS offers various web related services. The size and reach of Amazon Web Services justifies itself. They provides reliable, scalable, and inexpensive cloud computing services. They have 2 blogging platforms in which one is decicated to AWS Architecture and other one is dedicated to technology. You can follow their posts monitor the discussions so that you can respond, comment, and learn.

9. Puppet Lab

If you are a DevOps guy than you must heard about Puppet or Puppet Lab. Puppet is widely supported open source cofiguration management tool. If you explore Puppet Labs site than you can find there is a hefty amount of documentation and other information for the program and DevOps in general. So, I consider there site as a great paltform and is worth checking out.

10. Docker

Docker is an IT revolutionary tool, Docker pioneered the concept of containers. If you take a look on Docker site you can read about the container technologies and also understand the uses of Docker. They have there blog platform where they post about containerization and various other DevOps related informations which can not be missed if you are a DevOps enthusiast.

So, It doesn’t matter whether you are just starting out or an experienced professional, You should check above mentioned resources on regular basis and If you know about any other resources which you think should be listed then feel free to share with us.