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 »
Introduction Elasticsearch Aggregations provide you with the ability to group and perform calculations and statistics (such as sums and averages) on your data by using a simple search query. An aggregation can be viewed as a working unit that builds analytical information across a set of documents. Let’s see together different types of aggregations ! …
Introduction Due to COVID-19 most of us are now working from home. It may be difficult to stay as motivated as you might be in a workspace environment. In this article, I will try to give you tips and advices and how to keep your motivation high, how to schedule your day and how to …
Introduction In this article we will see 2 important concepts related to Elasticsearch : Mappings and Text Analysis. Let’s start with mappings ! Mappings Mapping is the process of defining how a document, and the fields it contains, are stored and indexed. For instance, use mappings to define: A mapping contains : In many uses …
Elastic Search Series : Text Analysis and Mappings Read More »
Communication through ElasticSearch There are 2 important network communication mechanisms in Elasticsearch to understand : The REST APIs of Elasticsearch are exposed over HTTP. The HTTP module binds to localhost by default and the default port is the first available between 9200-9299. Each call that goes from one node to another uses the transport module. …