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Answer: Employ managed instance groups with the "update-instances" command for rolling updates
Employing managed instance groups with the "update-instances" command for rolling updates ensures smooth updates and the ability to revert to a previous stable version. Object versioning aids in recovering previous versions of static data files, enhancing the roll-back capability.
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Following a software update that caused your e-commerce website on Google Cloud to crash for several hours, your CTO mandates a back-out/roll-back plan for all critical changes. The website is deployed across hundreds of VMs with frequent critical updates. Which two actions are essential for implementing the back-out/roll-back plan? (Choose one)
A
Enable object versioning for the website's static data files in Google Cloud Storage
B
Utilize unmanaged instance groups with the "update-instances" command for rolling updates
C
Employ managed instance groups with the "update-instances" command for rolling updates
D
Develop a new instance template with fixes and deploy via A/B testing