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Configure Shard Allocation and Forced Awareness in Elasticsearch

With Elasticsearch, you have the potential to scale your cluster to be highly available. To ensure your data survives a full zone or rack failure, you can spread your data across multiple zones and use shard allocation awareness to ensure that all replica shards are allocated to a different zone than that of their primary shard. This allows another level of fault tolerance beyond just node failure. In this hands-on lab, you are given the opportunity to exercise the following: * Apply node attributes to each data node in a cluster. * Configure shard allocation awareness for a cluster in multiple zones. * Test shard allocation awareness behavior by stopping all nodes in a zone.

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Labs

Path Info

Level
Clock icon Advanced
Duration
Clock icon 1h 30m
Published
Clock icon Jan 10, 2020

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Table of Contents

  1. Challenge

    Configure nodes data-1 and data-2 to have a "zone" node attribute with a value of "1".

    Using the Secure Shell (SSH), log in to the data-1 and data-2 nodes as cloud_user via the public IP address.

    Become the elastic user with:

    sudo su - elastic

    In the /home/elastic/elasticsearch/config/elasticsearch.yml file, change the following line:

    #node.attr.rack: r1

    to

    node.attr.zone: 1

    Restart the elasticsearch node with:

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

  2. Challenge

    Configure nodes data-3 and data-4 to have a "zone" node attribute with a value of "2".

    Using the Secure Shell (SSH), log in to the data-3 and data-4 nodes as cloud_user via the public IP address.

    Become the elastic user with:

    sudo su - elastic

    In the /home/elastic/elasticsearch/config/elasticsearch.yml file, change the following line:

    #node.attr.rack: r1

    to

    node.attr.zone: 2

    Restart the elasticsearch node with:

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

  3. Challenge

    Enable shard allocation awareness for the cluster per instructions.

    Use the Kibana console tool to execute the following:

    PUT _cluster/settings
{
  "persistent": {
    "cluster.routing.allocation.awareness.attributes": "zone",
    "cluster.routing.allocation.awareness.force.zone.values": "1,2"
  }
}

  4. Challenge

    Stop Elasticsearch on nodes data-3 and data-4.

    Using the Secure Shell (SSH), log in to the data-3 and data-4 nodes as cloud_user via the public IP address.

    Become the elastic user with:

    sudo su - elastic

    Stop the elasticsearch node with:

    pkill -F /home/elastic/elasticsearch/pid

  5. Challenge

    Ensure that all primary shards are assigned and all replica shards remain unassigned.

    Use the Kibana console tool to execute the following:

    GET _cat/shards?v
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Pluralsight Skills

Pluralsight Skills gives leaders confidence they have the skills needed to execute technology strategy. Technology teams can benchmark expertise across roles, speed up release cycles and build reliable, secure products. By leveraging our expert content, skill assessments and one-of-a-kind analytics, keep up with the pace of change, put the right people on the right projects and boost productivity. It's the most effective path to developing tech skills at scale.

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