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A Journey of a Thousand Miles Begins with a Single Step

The Base64 tool for Linux

HTTP basic authentication does base64 encoding. base64 exists on nearly every Linux distribution.

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Elasticsearch Nodes Memory Usage Watcher

TL,DR (Too long, Don’t read.). If you have a dedicated monitoring cluster for your Elasticsearch clusters, you should at least monitor the memory usage of each node. This is very helpful. Instead of fetching the data from the cluster within, we query the monitoring cluster remotely. This watch was created on Elasticsearch with X-Pack v5.4.3. Pay attention, that some values are tweaked and not realistic for production scenarios. The interval for instance is set to 6 hours, since we will execute this watch manually. We also choose 60% as threshold. 75% or 80% would be more realistic for warning scenarios.

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Install gosu for Docker

gosu is an essential help for dockerized applications. Following recipe is from daily work. I always have some connectivity issues due to security precautions. This recipe works especially behind corporate firewalls with a http proxy.

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Kerberos Utilities

Working with Kerberos these days. Some recipes for dealing with Kerberos. There are several open source implementations out there.

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Elasticsearch Hot Warm Architecture

Running a Elasticsearch cluster can be an easy task. If you have the need to store data for a long time, but you know the data is infrequently requested, you may think of a hot-warm architecture. This post is a brief summary of my setup for my company at work. At that time Elasticsearch v5.4.1 was running.

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Reduce Java Script content serving

To improve page speed on websites, one technique is to deliver less java-script files than leave them in their original state. While it is good for maintenance and separation of concerns to isolate or have a component structure, it isn’t in the way presenting or serving the content. This post demonstrate how to minify, or in the same sense uglify, your java script code with the node package uglify-js.

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Customize Kibana Look and Feel for different environments

My company uses Elasticsearch and Kibana for various reasons. One of my responsibilities is to ensure the stability of our elasticsearch test and production cluster. My users and me have problems to distinguish the various environments (test and production). It happen more than once, that I executed an action with Sense/Console in the wrong environment :anguished:. To make a better distinctive appearance, I dug a little in the Kibana source around and found it no so hard, to alter the appearance.

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Move documents to another Index in Elasticsearch

If you run into the situation, that documents were written to a wrong index, you can use the Reindex API to copy the documents to the desired index. You can remove them afterwards with the Delete By Query API.

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Coercion in Elasticsearch

If a field with its datatype in the mapping is defined, e.g. duration as Integer, Elasticsearch has a default behavior of coercion, if the value for the duration field is String. The String will be written, but interpreted as Integer. This can be a little bit misleading if you use only the document perspective.

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