Introduction In this new article we discuss about Deployments. What is a Deployment? An entity called “ReplicaSet” ensures that a specified number of pod replicas are running at any given time. However, a Deployment is a higher-level concept that manages ReplicaSets and provides declarative updates to Pods along with a lot of other useful features. Therefore, …
Introduction In this new article we discuss about ReplicaSets. What is a ReplicaSet ? A ReplicaSet’s purpose is basically to maintain a stable set of replica Pods running at any given time. As such, it is often used to guarantee the availability of a specified number of identical Pods. For example, if we only have …
Introduction We have seen together what Kubernetes was : an open source container orchestration system. Today, we will see how Kubernetes is built, how it works and 2 ways to deploy easily a lab environment Kubernetes Architecture In this first part, let’s see the basic concepts and components in a Kubernetes infrastructure. Nodes Nodes, or …
Kubernetes Series : K8S Architecture and Lab Environment Read More »
Introduction In this new article we will discuss about Namespaces and Imperative commands ! 🙂 What is a Namespace and how to create them ? Kubernetes supports multiple virtual clusters backed by the same physical cluster. These virtual clusters are called namespaces. Namespaces are intended for use in environments with many users spread across multiple teams, or …
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Quick reminder on Containers Before starting this new series of articles on Kubernetes, it is important to be sure that basics concepts like containers and orchestration are understood. Containers are designed to benefit for both developers and system administrators. Indeed, developers need to focus on writing code without worrying about the system that it will ultimately be running …
Introduction to JSON In the previous article, we have seen together how we can store data in a YAML file. Now let’s talk about JSON. YAML vs JSON JSON or JavaScript Object Notation is an open standard file format, and data interchange format, that uses human-readable text to store and transmit data objects consisting of attribute–value …
YAML / JSON (Part 2/2) JSON Paths and JSON Queries Read More »
Introduction In the next 2 following articles, we will see together how YAML Files are created to store data and how we can retrieve data from them. It will be useful in a lot of my incoming articles (i.e Kubernetes series (!)) YAML (“YAML Ain’t Markup Language”) is a human-readable data-serialization language. It is less complex and ungainly than XML or JSON, …
YAML / JSON (Part 1/2) How to write or read YAML Files Read More »
Introduction In this new article we will start to see Kubernetes concepts. The first one is PODS. We will also see how to create a YAML file. But let’s begin by explaining what is a POD. What is a POD ? If you have read my previous article about containers on Dockers, you are already …
Introduction Firewalld provides a dynamically managed firewall with support for network/firewall zones that define the trust level of network connections or interfaces. It has support for IPv4, IPv6 firewall settings, ethernet bridges and IP sets. There is a separation of runtime and permanent configuration options. It also provides an interface for services or applications to …
Introduction In this last article we will see together how you can monitore and troubleshoot your Elasticsearch cluster. Let’s start with Elasticsearch Responses. Elasticsearch Responses HTTP Errors As explained in previous articles, Elasticsearch uses the REST APIs. Several HTTP responses status can be displayed : Index Response Body Write operations like delete, index, create and update return shard information : “_shards”: …
Elastic Search Series : Monitoring and Troubleshooting Read More »