Kubernetes Deployment with InitContainers scenarios with Permission Denied scenarios in v1.30
I'm trying to figure out I'm upgrading from an older version and I'm currently working with a Kubernetes deployment that utilizes `initContainers` to prepare some resources before the main application starts. However, I keep working with a `permission denied` behavior when the `initContainer` tries to execute a script. The `initContainer` is meant to create a directory and modify its permissions, but it seems like it's not able to do so due to permission issues. Here's the relevant part of my deployment YAML: ```yaml apiVersion: apps/v1 kind: Deployment metadata: name: my-app spec: replicas: 2 selector: matchLabels: app: my-app template: metadata: labels: app: my-app spec: initContainers: - name: init-myservice image: alpine:latest command: ["sh", "-c", "mkdir -p /data && chmod 777 /data"] volumeMounts: - name: shared-data mountPath: /data containers: - name: my-app image: my-app-image:latest volumeMounts: - name: shared-data mountPath: /data volumes: - name: shared-data emptyDir: {} ``` When I deploy this configuration, the logs from the `initContainer` show the following behavior: ``` behavior: chmod: /data: Permission denied ``` I've verified that the `initContainer` is running as the root user, and the `emptyDir` volume is being set up correctly. I've also tried changing the `command` to just `mkdir /data`, and it works without any issues, but the `chmod` command fails. My Kubernetes version is v1.30, and I am running this on a GKE cluster. I've also researched the implications of the `securityContext`, but adding this to the container spec does not solve the scenario. Here’s what I tried: 1. Adding `securityContext` to the `initContainer`: ```yaml securityContext: runAsUser: 0 ``` 2. Removing `chmod` entirely and attempting to set permissions within the main app container post-init. However, neither of these approaches resolved the permission scenario. Any insights into why the `chmod` command would unexpected result in the `initContainer` would be greatly appreciated! Thanks, I really appreciate it! This is happening in both development and production on CentOS. Any examples would be super helpful.