Rolling upgrades in Elasticsearch - Mini Project: Build & Apply

Rolling Upgrades in Elasticsearch

📖 Scenario: You manage an Elasticsearch cluster that needs to be upgraded without downtime. Rolling upgrades let you update nodes one by one, keeping the cluster available.

🎯 Goal: Learn how to perform a rolling upgrade by updating node settings and verifying cluster health step-by-step.

📋 What You'll Learn

Create a dictionary with node names and their current versions

Add a variable for the target upgrade version

Write a loop to simulate upgrading nodes one by one

Print the final cluster version after all upgrades

💡 Why This Matters

🌍 Real World

Rolling upgrades help keep Elasticsearch clusters available while updating nodes one at a time.

💼 Career

Understanding rolling upgrades is important for DevOps and system administrators managing Elasticsearch in production.

1

Create the initial cluster nodes data

Create a dictionary called nodes with these exact entries: 'node1': '7.10.0', 'node2': '7.10.0', 'node3': '7.10.0'

Elasticsearch

# Create the dictionary called nodes with the given node versions
# Your code here

Need a hint?

Use curly braces to create a dictionary with keys as node names and values as version strings.

2

Set the target upgrade version

Create a variable called target_version and set it to the string '7.11.0'

Elasticsearch

nodes = {'node1': '7.10.0', 'node2': '7.10.0', 'node3': '7.10.0'}
# Create the variable target_version with value '7.11.0'
# Your code here

Need a hint?

Assign the string '7.11.0' to the variable target_version.

3

Simulate rolling upgrade of nodes

Use a for loop with variable node to iterate over nodes keys and update each node's version to target_version inside the loop

Elasticsearch

nodes = {'node1': '7.10.0', 'node2': '7.10.0', 'node3': '7.10.0'}
target_version = '7.11.0'
# Use a for loop to update each node's version to target_version
# Your code here

Need a hint?

Loop over the dictionary keys and assign the target_version to each key's value.

4

Print the final cluster versions

Write a print statement to display the nodes dictionary

Elasticsearch

nodes = {'node1': '7.10.0', 'node2': '7.10.0', 'node3': '7.10.0'}
target_version = '7.11.0'
for node in nodes:
    nodes[node] = target_version
# Print the nodes dictionary
# Your code here

Need a hint?

Use print(nodes) to show the updated versions after upgrade.