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Diagnose and Repair Elasticsearch Clusters

When configured correctly, Elasticsearch clusters are highly available and fault tolerant. That doesn't necessarily mean they are impervious to failure. Human error and hardware failure are always a possibility. Troubleshooting data availability issues on a distributed system can be a challenge so let's take some time to demystify some basic troubleshooting routines when you notice yellow or even red indexes in your Elasticsearch cluster. In this hands-on lab, you are given the opportunity to: * Use the `_cat` APIs to quickly get vital information about your cluster * Use the `_cluster/allocation/explain` API to find out why and index is or is not allocated * Use the `_settings` API to quickly update index settings

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Path Info

Level
Clock icon Advanced
Duration
Clock icon 3h 0m
Published
Clock icon Jan 10, 2020

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Table of Contents

  1. Challenge

    Troubleshoot the "accounts-1" index.

    Using the Secure Shell (SSH), log in to the data-2 and data-3 nodes as cloud_user via the public IP address.

    Become the elastic user with:

    sudo su - elastic

    Start the elasticsearch node with:

    /home/elastic/elasticsearch/bin/elasticsearch -d -p pid

    Use the Kibana console tool to execute the following:

    PUT accounts-1/_settings
{
  "number_of_replicas": 3
}

  2. Challenge

    Troubleshoot the "accounts-2" index.

    Use the Kibana console tool to execute the following:

    PUT accounts-2/_settings
{
  "number_of_replicas": 3
}

  3. Challenge

    Troubleshoot the "accounts-3" index.

    Use the Kibana console tool to execute the following:

    PUT accounts-3/_settings
{
  "index.routing.allocation.exclude._name": null
}
A Cloud Guru - Labs - Diagnose and Repair Elasticsearch Clusters
Author
A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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