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
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
1You can make it multiline like this:
$ kubectl exec POD_NAME -- bash -c "date && \
echo 1 && \
echo 2"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 varIf above command doesn't work then try too replace bash with one of the following /bin/bash, sh, bin/sh
-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"