DebugPod.txt

#application trouble shooting

Debug pods
Debug Replication controllers
Debug services

#Debug pods
k describe pods ${POD_NAME}
Pending status means, it can't be scheduled onto a node
  - check resources
  -hostport is unecessary

Waiting status
 common: failure to pull image
   - run docker pull <image>
   
 For running PODS:
 k logs podname containername
  
  previously crashed
  k logs -- previous podname container name
 
 use k exec podname -c contianername -- cmd arg1 .. argn
 
 v1.23 [beta]
 k debug -it podname --image=busybox --target=podname
  --target must be supported by CRI
 
 Copy a Pod while adding a new container
 k debug podname -it --image=ubuntu --share-processes --copy-to=podname-debug
 
 Copy a pod while changing container images
 k debug podname --copy-to=myapp-debug --set-image=*=ubuntu
 
 Debug via shell on node
 k debug node/nodename --it --image=ubuntu