[TBD]Debugging apps running as Kubernetes PODs

Method to change code from the host machine while debugging

Use host mount approach in the kubernetes.

Example YAML

Example YAML to mount host point to POD

root@ubuntu-232:~/deepak# cat hostmount.yaml

apiVersion: v1

kind: Pod

metadata:

name: test-pd

spec:

containers:

- image: ubuntu:latest

command: [ "/bin/bash", "-c", "--" ]

args: [ "apt-get -y install vim;while true; do sleep 30; done;" ]

name: test-container

volumeMounts:

- mountPath: /test-pd

name: test-volume

volumes:

- name: test-volume

hostPath:

# directory location on host

path: /data

# this field is optional

type: Directory

root@ubuntu-232:~/deepak#

Example log

Example log

From host machine

root@ubuntu-231:~/deepak# cd /data/

root@ubuntu-231:/data# touch abcd

root@ubuntu-231:/data#

root@ubuntu-231:/data# ls

abcd efgh

Within container

root@ubuntu-232:~/deepak# kubectl exec -it test-pd bash

root@test-pd:/# ps ax

PID TTY STAT TIME COMMAND

1 ? Ss 0:00 /bin/bash -c -- apt-get -y install vim;while true; do sleep 30; done;

22 ? S 0:00 sleep 30

23 ? Ss 0:00 bash

32 ? R+ 0:00 ps ax

root@test-pd:/#

root@test-pd:/# cd /test-pd/

root@test-pd:/test-pd# ls

root@test-pd:/test-pd# ls

abcd

root@test-pd:/test-pd#

root@test-pd:/test-pd# touch efgh

root@test-pd:/test-pd# pwd

/test-pd

root@test-pd:/test-pd# ls

abcd efgh

Useful link: https://stackoverflow.com/questions/46951466/how-to-mount-external-directory-in-kubernetes-service