Elasticsearch 7 and Elastic Stack - In Depth and Hands On! - Rolling Restarts

The video tutorial covers the process of performing maintenance on an Elasticsearch cluster, emphasizing the importance of disabling index reallocation during such operations. It provides a detailed procedure for conducting a rolling restart, including stopping data indexing, disabling shard allocation, and re-enabling it after maintenance. A cheat sheet with commands for managing shard allocation is provided, followed by a practical exercise to apply the learned concepts.

Why is it important to disable index reallocation during cluster maintenance?

• To reduce server load

• To increase indexing speed

• To avoid unnecessary shard movement

• To prevent data loss

What is the first step in the rolling restart procedure for cluster maintenance?

• Disable shard allocation

• Stop indexing new data

• Restart the node

• Check cluster health

What command is used to disable shard allocation in Elasticsearch?

• put_node settings with allocation set to none

• get_node settings with allocation set to all

• get_cluster settings with allocation set to all

• put_cluster settings with allocation set to none

Why is it recommended to practice the shard allocation procedure before applying it to a live cluster?

• To ensure data security

• To avoid server downtime

• To become familiar with the process

• To improve indexing speed

What is the status of the cluster when a node is shut down during maintenance?

• Green

• Red

• Blue

• Yellow

What happens to the cluster status when shard allocation is re-enabled after maintenance?

• It remains yellow

• It turns blue

• It turns red

• It turns green

What is the purpose of performing a health check on the cluster during maintenance?

• To check cluster status

• To disable shard allocation

• To ensure data indexing

• To verify node shutdown