AWS Certified DevOps Engineer - Professional
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A company requires automation for managing the addition of new nodes to their proprietary enterprise in-memory data store cluster on AWS. The cluster operates on multiple Linux-based server nodes and necessitates a complete reconfiguration upon any node addition or removal. This reconfiguration involves updating the /etc/cluster/nodes.config file with the current node members' IP addresses. What solution can a DevOps engineer propose to automate this process?
A
Use AWS OpsWorks Stacks to layer the server nodes of that cluster. Create a Chef recipe that populates the content of the /etc/cluster/nodes.config file and restarts the service by using the current members of the layer. Assign that recipe to the Configure lifecycle event.
B
Put the file nodes.config in version control. Create an AWS CodeDeploy deployment configuration and deployment group based on an Amazon EC2 tag value for the cluster nodes. When adding a new node to the cluster, update the file with all tagged instances, and make a commit in version control. Deploy the new file and restart the services.
C
Create an Amazon S3 bucket and upload a version of the /etc/cluster/nodes.config file. Create a crontab script that will poll for that S3 file and download it frequently. Use a process manager, such as Monit or systemd, to restart the cluster services when it detects that the new file was modified. When adding a node to the cluster, edit the file’s most recent members. Upload the new file to the S3 bucket.
D
Create a user data script that lists all members of the current security group of the cluster and automatically updates the /etc/cluster/nodes.config file whenever a new instance is added to the cluster.