Terminal shell in container

The Terminal shell in container event in a Kubernetes cluster refers to a situation where a shell is opened within a container running in the cluster.
This event can indicate potential security risks, as it may suggest unauthorized access or an attacker gaining control over the container.
To investigate this event, you can use the kubectl exec command to access the container and inspect the shell activity. For example, kubectl exec -it <pod-name> -- /bin/bash allows you to open a shell within the container and analyze any suspicious activities.

To remediate the event “Terminal shell in container” using the Python Kubernetes API, you can follow these steps:

Identify the affected container:
- Use the Kubernetes API to list all the pods in the cluster: kubectl get pods -o wide
- Identify the pod that triggered the event and note down its name.
Modify the pod’s security context
- Ensuring the pod does not run as a privileged user.
- Disabling privilege escalation.
- Export the current configuration of the affected pod:
```
  kubectl get pod <pod-name> -o yaml > pod.yaml
```
- Edit the pod.yaml file to update the securityContext section:
```
spec:
securityContext:
   runAsNonRoot: true
   allowPrivilegeEscalation: false
   capabilities:
      drop:
      - ALL
```
Apply the Updated Configuration:
```
   kubectl apply -f pod.yaml
```
Restrict Terminal Access in Pod Specification::
- Ensure that terminal shell access is restricted by reviewing and modifying the command and args fields in the pod specification:
- Remove any unnecessary shell commands or entrypoints from the container configuration.
- Example configuration to prevent interactive shell access:
```
spec:
containers:
- name: your-container
   command:
      - /your-app
   args:
      - --no-shell
```
Apply the changes to the pod:
- Use the Python Kubernetes API to apply the modified manifest: kubectl apply -f pod.yaml
- Verify that the changes have been applied successfully: kubectl get pod <pod-name>

Note: Make sure to test the modified pod thoroughly before applying it to production environments.