How Do You Delete VM Instances from GCP That Pertain to GKE?

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Problem Scenario
You have some GKE standard clusters that you want deleted. You try to delete them, but they do not go away. What should you do?

Solution
Root cause: Kubernetes clusters are self-healing. They are acting as they were designed. Once the instance group is deleted, you will be able to delete the instances via the web UI or via Google’s Cloud Shell.

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How Do You Install Docker on Debian Linux in GCP?

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Problem scneario
In Google Cloud Platform you have a Debian Linux server. You want to install Docker on it. What do you do?

Solution
1. Create a file called dockerinstall.sh in the /tmp/ directory with the following content:

apt-get -y update
apt-get install -y apt-transport-https ca-certificates wget software-properties-common

wget https://download.docker.com/linux/debian/gpg
apt-key add gpg

echo “deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable” | sudo tee -a /etc/apt/sources.list.d/docker.list
apt-get -y update

apt-get -y install docker-ce

2.

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How Do You Troubleshoot the Google Kubernetes Engine error “Request had insufficient authentication scopes”?

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Problem scenario
 You run a command like this:
gcloud container clusters get-credentials standard-cluster-1 –region us-central1-a

But you receive one of the following messages:
“Fetching cluster endpoint and auth data.
ERROR: (gcloud.container.clusters.get-credentials) ResponseError: code=403, message=Request had insufficient authentication scopes.”

ERROR: (gcloud.projects.describe) User [123456789-compute@developer.gserviceaccount.com] does not have permission to access projects instance [123456789] (or it may not exist): Request had insufficient
authentication scopes.

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How Do You Troubleshoot This Error “error executing access token command /google/google-cloud-sdk/bin/gcloud”?

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Problem scenario
You run a command like this to view your Google Kubernetes Engine (GKE) clusters:

kubectl get pods

You see this:
‘Unable to connect to the server: error executing access token command “/google/google-cloud-sdk/bin/gcloud config config-helper –format=json”: err=fork/exec /google/google-cloud-sdk/bin/gcloud: no such file or directory output= stderr=’

What should you do?

Solution
Check your config file in the .kube directory.

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How Do You Troubleshoot the Kubernetes Problem “connection to the server localhost:8080 was refused”?

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One of the following applies (with #1 being related to Kubernetes anywhere and #2 only being relevant to running Kubernetes in GCP).

Problem scenario #1 (any Kubernetes)
You run a command like this: kubectl get svc

You get an error like this: The connection to the server localhost:8080 was refused – did you specify the right host or port?

What should you do?

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How Do You Use Google’s Cloud Pub/Sub with Python?

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Problem scenario
You want to use a Data Analytics or a Big Data tool that publishes messages and subscribes to listening to messages being published. You know GCP has a Pub/Sub tool. You know it supports synchronous and asynchronous messaging. How do you use it with Python?

Solution

  1. Log into GCP via the web UI.
  2. Go here: https://console.cloud.google.com/cloudpubsub/
  3. Click “Create Topic”.

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How Do You Delete VM Instances from GCP That Pertain to GKE?

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Problem Scenario
You have some GKE standard clusters that you want deleted.  What should you do?

Possible Solution #1 (from the Cloud Shell or with a gcloud command)
1.  Delete the instance group of the instance for the cluster you want to delete.  To do this in the web UI, go to Compute Engine -Instance Groups.  Check the box on the left-hand side and click on “Delete”.

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How Do You Troubleshoot This Message “ImportError: No module named ‘google.cloud’?

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Problem scenario
You run a Python program or from the Python command prompt you receive this message:

Traceback (most recent call last):
  File “main.py”, line 21, in <module
    from google.cloud import pubsub_v1
 ImportError: No module named ‘google.cloud’
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ModuleNotFoundError: No module named ‘google’

What should you do to eliminate this problem?

Possible Solution #1
Try to run the program as sudo:

sudo python nameOfProg.py

Possible Solution #2
Try this with or without sudo (depending on whether or not you are using “sudo” to run the Python program):

sudo pip install google-cloud-bigquery

# You may or may not want to omit the “sudo” in the above command.

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