Devops and aws interview preparation Hyderabad

Hi i am going to start new aws&Devops session on 09-11-2026 @ 8 Am IST The training main intention is to clear the interview yourself ping me who are interested to join the session 9154078579

Question:-118 How does Docker layer caching work?

1.Docker layer caching speeds up image build times by reusing unchanged intermediate layers from previous builds rather than executing every instruction in a Dockerfile from scratch
2.Docker uses different criteria to check if a layer can be reused based on the instruction type
--->If the text of the command (RUN, ENV, WORKDIR) has changed (even a simple argument change), the cache is invalidated.
---> Docker (COPY, ADD) calculates a unique checksum for every file and directory being added. It compares this checksum against the files in the cached layer. If any contents, permissions, or modifications have changed, the cache is invalidated.
---->For a command like RUN apt-get update, Docker only checks the command string. It does not know if the remote software repositories have new updates. It will pull from the cache anyway unless forced otherwise.
To learn aws&Devops from scratch ping me 9154078579

Question:-117 How we can do helm upgrade to latest version of Ingress NGINX?

1.Before upgrading, we must fetch the latest chart metadata from our repository provider.
----->helm repo update ingress-nginx
2.To upgrade the release to the latest version, we can execute helm upgrade followed by our release name and the repository path
----->helm upgrade <RELEASE_NAME> ingress-nginx/ingress-nginx
? what is RELEASE_NAME
--->If our Application is named my-app, the Helm release will also be named my-app.
### The release name is the handle we use to track, manage, upgrade, or uninstall that specific deployment
3.If the latest version causes issues or application downtime, immediately revert to our last stable revision
----->helm rollback <release-name> <revision-number> --namespace <namespace>

To learn aws&Devops from scratch ping me 9154078579