Lab
A Cloud Guru

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

Advanced

Duration

3h 0m

Published

Jan 10, 2020

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
}
```
Challenge

Troubleshoot the "accounts-2" index.
Use the Kibana console tool to execute the following:
```
PUT accounts-2/_settings
{
  "number_of_replicas": 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
}
```

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!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.