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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

Lab Info
Table of Contents
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Challenge
Troubleshoot the "accounts-1" index.
Using the Secure Shell (SSH), log in to the
data-2
anddata-3
nodes ascloud_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 }
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Challenge
Troubleshoot the "accounts-2" index.
Use the Kibana console tool to execute the following:
PUT accounts-2/_settings { "number_of_replicas": 3 }
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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 }
About the author
Real skill practice before real-world application
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