Ensure Kubernetes Deployment has completed and all pods are updated and available

Question

The status of a deployment indicates that you can look at a deployments observedGeneration vs generation and when observedGeneration >= genera

Answer 1

Just use a rollout status:

kubectl rollout status deployment/

This will run in foreground, it waits and displays the status, and exits when rollout is complete on success or failure. If you're writing a shell script, then check the return code right after the command, something like this.

kubectl rollout status deployment/
if [[ "$?" -ne 0 ]] then
    echo "deployment failed!"
    exit 1
fi

To even further automate your script:

deployment_name=$(kubectl get deployment -n  | awk '!/NAME/{print $1}')  
kubectl rollout status deployment/"${deployment_name}" -n 
if [[ "$?" -ne 0 ]] then
    echo "deployment failed!"
    #exit 1
else
    echo "deployment succeeded"
fi

If you're running in default namespace then you could leave out the -n . The command awk '!/NAME/{print $1}') extracts the first field (deployment name), while ignoring the first row which is the header(NAME READY UP-TO-DATE AVAILABLE AGE). If you have more than one deployment files then you could also add more regex or pattern to awk: e.g. awk '!/NAME//{print $1}')