Pretty much the title of the question.

I am working with an Ubuntu system that has a k8s deployment with multiple nodes and with multiple pods that run Docker containers. A few of the pods are nodeJS microservices which run the following command at initiation:

node app.js

Sometimes I need to debug the microservice by adding logs, changing logic inside, etc.

Working with the same microservices in Windows I could just change the source code and restart the node.exe process. How would I achieve doing the same in Linux with a Kubernetes deployment?

I attempted to run a shell:

user@node1:~$ kubectl exec my-microservice-XXXX -it -- sh

Change source code and save: nano app.js

Find the node process: ps aux

PID   USER     TIME  COMMAND
    1 root      0:00 npm
   22 root      0:00 npm
   42 root      0:27 node --max-http-header-size=65000 app.js

Then send SIGTERM to PID 42:

kill SIGTERM 42

And this results in me being booted out of the pod:

/usr/src/app # kill SIGTERM 42
sh: invalid number 'SIGTERM'
/usr/src/app # command terminated with exit code 137
test@node1:~$

And a new pod starts automatically:

my-microservice-XXXX                       0/1     Completed   1          19h
my-microservice-XXXX                       1/1     Running     2          19h