问题
my question is simple.
How to execute a bash command in the pod? I want to do everything with one bash command?
[root@master ~]# kubectl exec -it --namespace="tools" mongo-pod --bash -c "mongo"
Error: unknown flag: --bash
So, the command is simply ignored.
[root@master ~]# kubectl exec -it --namespace="tools" mongo-pod bash -c "mongo"
root@mongo-deployment-78c87cb84-jkgxx:/#
Or so.
[root@master ~]# kubectl exec -it --namespace="tools" mongo-pod bash mongo
Defaulting container name to mongo.
Use 'kubectl describe pod/mongo-deployment-78c87cb84-jkgxx -n tools' to see all of the containers in this pod.
/usr/bin/mongo: /usr/bin/mongo: cannot execute binary file
command terminated with exit code 126
If it's just a bash, it certainly works. But I want to jump into the mongo shell immediatelly.
I found a solution, but it does not work. Tell me if this is possible now? Executing multiple commands( or from a shell script) in a kubernetes pod
Thanks.
回答1:
The double dash symbol "--" is used to separate the arguments you want to pass to the command from the kubectl arguments. So the correct way is:
kubectl exec -it --namespace=tools mongo-pod -- bash -c "mongo"
You forgot a space between "--" and "bash".
To execute multiple commands you may want:
to create a script and mount it as a volume in your pod and execute it
to launch a side container with the script and run it
回答2:
I use something like this for get into the pod's shell:
kubectl exec -it --namespace develop pod-name bash
then you can execute the command you want within the pod (e.g. ping)
ping www.google.com
来源：https://stackoverflow.com/questions/51247619/execute-bash-command-in-pod-with-kubectl