Create a Pod with two containers, both with image busybox and command "echo hello; sleep 3600". Connect to the second container and run 'ls'
show
Easiest way to do it is create a pod with a single container and save its definition in a YAML file:
kubectl run busybox --image=busybox --restart=Never -o yaml --dry-run=client -- /bin/sh -c 'echo hello;sleep 3600' > pod.yaml
vi pod.yaml
Copy/paste the container related values, so your final YAML should contain the following two containers (make sure those containers have a different name):
containers:
- args:
- /bin/sh
- -c
- echo hello;sleep 3600
image: busybox
imagePullPolicy: IfNotPresent
name: busybox
resources: {}
- args:
- /bin/sh
- -c
- echo hello;sleep 3600
image: busybox
name: busybox2
kubectl create -f pod.yaml
# Connect to the busybox2 container within the pod
kubectl exec -it busybox -c busybox2 -- /bin/sh
ls
exit
# or you can do the above with just an one-liner
kubectl exec -it busybox -c busybox2 -- ls
# you can do some cleanup
kubectl delete po busybox
Create a pod with an nginx container exposed on port 80. Add a busybox init container which downloads a page using "wget -O /work-dir/index.html https://neverssl.com/online". Make a volume of type emptyDir and mount it in both containers. For the nginx container, mount it on "/usr/share/nginx/html" and for the initcontainer, mount it on "/work-dir". When done, get the IP of the created pod and create a busybox pod and run "wget -O- IP"
show
Easiest way to do it is create a pod with a single container and save its definition in a YAML file:
kubectl run box --image=nginx --restart=Never --port=80 --dry-run=client -o yaml > pod-init.yaml
Copy/paste the container related values, so your final YAML should contain the volume and the initContainer:
Volume:
containers:
- image: nginx
...
volumeMounts:
- name: vol
mountPath: /usr/share/nginx/html
volumes:
- name: vol
emptyDir: {}
initContainer:
...
initContainers:
- args:
- /bin/sh
- -c
- wget -O /work-dir/index.html https://neverssl.com/online
image: busybox
name: box
volumeMounts:
- name: vol
mountPath: /work-dir
In total you get:
apiVersion: v1
kind: Pod
metadata:
labels:
run: box
name: box
spec:
initContainers:
- args:
- /bin/sh
- -c
- wget -O /work-dir/index.html https://neverssl.com/online
image: busybox
name: box
volumeMounts:
- name: vol
mountPath: /work-dir
containers:
- image: nginx
name: nginx
ports:
- containerPort: 80
volumeMounts:
- name: vol
mountPath: /usr/share/nginx/html
volumes:
- name: vol
emptyDir: {}
# Apply pod
kubectl apply -f pod-init.yaml
# Get IP
kubectl get po -o wide
# Execute wget
kubectl run box-test --image=busybox --restart=Never -it --rm -- /bin/sh -c "wget -O- IP"
# you can do some cleanup
kubectl delete po box