Identify any Amazon ElastiCache cluster nodes that appear to be idle and remove them from your account to help lower the cost of your monthly AWS bill. By default, an AWS ElastiCache node is considered 'idle' when meets the following criteria:
The average CPU Utilization has been less than 2% for the last 7 days.
- The AWS CloudWatch metrics used to detect idle ElastiCache clusters are:
CPUUtilization (host-level metric) - the percentage of CPU resources used by ElastiCache cache nodes (Units: Percentage).
Note 1: You can easily change the default threshold for this rule on Cloud Conformity console and set your own value for the CPU usage in order to configure the ElastiCache nodes idleness based on your requirements.
Note 2: For this rule Cloud Conformity assumes that your AWS ElastiCache resources are tagged with 'Role' and 'Owner' tags which provide visibility into their usage profile and help you decide whether it`s safe or not to terminate them.
This rule resolution is part of the Cloud Conformity solution
Idle Amazon ElastiCache cache cluster nodes represent a good candidate to reduce your monthly AWS costs and avoid accumulating unnecessary usage charges.
Case A: To determine if you have any idle ElastiCache Memcached cluster nodes within your AWS account, perform the following:
Case B: To determine if you have any idle ElastiCache Redis cluster nodes within your AWS account, perform the following:
Remediation / Resolution
Option 1: Delete any AWS ElastiCache clusters that are currently running in idle mode. To remove the idle cache clusters, perform the following actions:
Option 2: Disable the rule check. If the selected idle Amazon ElastiCache cluster is needed (its role within your application stack/environment is important), you may want turn off the conformity rule check for the specified ElastiCache cluster from the Cloud Conformity console
- AWS Documentation
- Amazon ElastiCache Product Features and Details
- Dimensions for ElastiCache Metrics
- Host-Level Metrics
- Which Metrics Should I Monitor?
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Idle AWS ElastiCache Nodes
Risk level: High