Executing multiple commands( or from a shell script) in a kubernetes pod

问题

I'm writing a shell script which needs to login into the pod and execute a series of commands in a kubernetes pod.

below is my sample_script.sh

kubectl exec octavia-api-worker-pod-test -c octavia-api bash unset http_proxy https_proxy mv /usr/local/etc/octavia/octavia.conf /usr/local/etc/octavia/octavia.conf-orig /usr/local/bin/octavia-db-manage --config-file /usr/local/etc/octavia/octavia.conf upgrade head

After running this script, I'm not getting any output. Any help will be greatly appreciated

回答1:

Are you running all these commands as a single line command? First of all, there's no ; or && between those commands. So if you paste it as a multi-line script to your terminal, likely it will get executed locally.

Second, to tell bash to execute something, you need: bash -c "command".

Try running this:

$ kubectl exec POD_NAME -- bash -c "date && echo 1"

Wed Apr 19 19:29:25 UTC 2017
1

You can make it multiline like this:

$ kubectl exec POD_NAME -- bash -c "date && \
      echo 1 && \
      echo 2"

回答2:

-t can solve your task

For example, I run here few cmd:

kubectl get pods |grep nginx|cut -f1 -d\  |\
while read pod; \
 do echo "$pod writing:";\
  kubectl exec -t $pod -- bash -c \
   "dd if=/dev/zero of=/feeds/test.bin bs=260K count=4 2>&1|\
    grep copi |cut -d, -f4; \
    a=$SECONDS; echo -ne 'reading:'; cat /feeds/test.bin >/dev/null ; \
    let a=SECONDS-a ; \
    echo $a sec"
done

p.s. your example will be:

kubectl exec -t octavia-api-worker-pod-test -c octavia-api -- bash -c "unset http_proxy https_proxy ; mv /usr/local/etc/octavia/octavia.conf /usr/local/etc/octavia/octavia.conf-orig ; /usr/local/bin/octavia-db-manage --config-file /usr/local/etc/octavia/octavia.conf ; upgrade ; head"

回答3:

The following should work

kubectl -it exec podname -- bash -c "ls && ls"

bin   dev   etc   home  proc  root  run   sys   tmp   usr   var bin  
dev   etc   home  proc  root  run   sys   tmp   usr   var

If above command doesn't work then try too replace bash with one of the following /bin/bash, sh, bin/sh

来源：https://stackoverflow.com/questions/43499313/executing-multiple-commands-or-from-a-shell-script-in-a-kubernetes-pod

标签

Kubernetes

kubernetes-pod