Added gcp cli notes to the knowledge base

knowledge base/gcloud.md

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+# Google cloud platform CLI <!-- omit in toc -->
+
+- [TL;DR](#tldr)
+- [Further readings](#further-readings)
+
+## TL;DR
+
+```shell
+# Login.
+gcloud auth login
+gcloud auth login account
+
+# Set applications.
+gcloud auth application-default login
+gcloud auth application-default login --no-launch-browser
+
+# Activate a service account.
+gcloud auth activate-service-account \
+  serviceaccount@gcpproject.iam.gserviceaccount.com \
+  --key-file /tmp/sa.credentials.json
+
+# Configure the CLI.
+gcloud config set account serviceaccount@gcpproject.iam.gserviceaccount.com
+gcloud config set project project-id
+gcloud config set compute/region europe-west1
+
+# List current settings.
+gcloud config list
+gcloud config list --configuration profile
+
+# Create a new profile.
+gcloud config configurations create new-active-profile
+gcloud config configurations create --no-activate new-inactive-profile
+
+# List available profiles.
+gcloud config configurations list
+
+# Switch to a different configuration.
+gcloud config configurations activate old-profile
+
+# SSH into a compute instance.
+gcloud compute ssh --zone zone instance --project project
+gcloud beta compute ssh --zone zone instance --project project
+
+# Show operations.
+# Filters are suggested.
+gcloud container operations list --filter="NOT status:DONE"
+gcloud container operations list \
+  --filter="name:operation-1513320920760-9c26cff5 AND status:RUNNING"
+gcloud compute operations list --filter="region:europe-west4 AND -status:DONE"
+gcloud compute operations list \
+  --filter="region:(europe-west4 us-east2)" \
+  --filter="status!=DONE"
+
+# Use a specific service account for an operation.
+# The service account must have been activated.
+gcloud config set account serviceaccount@gcpproject.iam.gserviceaccount.com \
+  && gcloud auth application-default login --no-launch-browser \
+  && gcloud compute instances list
+
+# Logout.
+gcloud auth revoke --all
+gcloud auth revoke account
+```
+
+## Further readings
+
+- [Gcloud cheat-sheet]
+- [Kubectl cluster access]
+- [How to run gcloud command line using a service account]
+- [How to change the active configuration profile in gcloud]
+- [Gcloud config configurations]
+
+[gcloud cheat-sheet]: https://cloud.google.com/sdk/gcloud/reference/cheat-sheet
+[gcloud config configurations]: https://cloud.google.com/sdk/gcloud/reference/config/configurations
+[how to change the active configuration profile in gcloud]: https://stackoverflow.com/questions/35744901/how-to-change-the-active-configuration-profile-in-gcloud#35750001
+[how to run gcloud command line using a service account]: https://pnatraj.medium.com/how-to-run-gcloud-command-line-using-a-service-account-f39043d515b9
+[kubectl cluster access]: https://cloud.google.com/kubernetes-engine/docs/how-to/cluster-access-for-kubectl