title: Kubernetes with logrotate sidecar mount point issue
body: <p>I am trying to deploy a test pod with nginx and logrotate sidecar.
  Logrotate sidecar taken from: <a href="https://github.com/honestbee/logrotate" rel="nofollow noreferrer">logrotate</a></p>
  
  <p>My Pod yaml configuration:</p>
  
  <pre><code>apiVersion: v1
  kind: Pod
  metadata:
    name: nginx-apache-log
    labels:
      app: nginx-apache-log
  
  spec:
    containers:
  
    - name: nginx
      image: nginx:latest
      ports:
      - containerPort: 80
      volumeMounts:
      - name: logs
        mountPath: /var/log
  
    - name: logrotate
      image: path/to/logrtr:sidecar
      volumeMounts:
      - name: logs
        mountPath: /var/log
  
    volumes:
    - name: logs
      emptyDir: {}
  </code></pre>
  
  <p>What I'd like to achieve is Logrotate container watching /var/log/<em>/</em>.log, however with the configuration above, nginx container is failing because there is no /var/log/nginx:</p>
  
  <pre><code>nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (2: No such file or directory)
  2018/10/15 10:22:12 [emerg] 1#1: open() "/var/log/nginx/error.log" failed (2: No such file or directory)
  </code></pre>
  
  <p>However if I change mountPath for nginx from </p>
  
  <pre><code>mountPath: /var/log 
  </code></pre>
  
  <p>to:</p>
  
  <pre><code>mountPath: /var/log/nginx
  </code></pre>
  
  <p>then it is starting, logging to /var/log/nginx/access.log and error.log, but logrotate sidecar sees all logs in /var/log not /var/log/nginx/. It is not a problem with just one nginx container, but I am planning to have more container apps logging to their own /var/log/appname folders.</p>
  
  <p>Is there any way to fix/workaround that? I don't want to run sidecar for each app.</p>
  
  <p>If I change my pod configuration to:</p>
  
  <pre><code>  - name: nginx
      image: nginx:latest
      ports:
      - containerPort: 80
      volumeMounts:
      - name: logs
        mountPath: /var/log
    initContainers:
      - name: install
        image: busybox
        command:
        - mkdir -p /var/log/nginx
        volumeMounts:
        - name: logs
          mountPath: "/var/log"
  </code></pre>
  
  <p>then it is failing with: </p>
  
  <pre><code>Warning  Failed     52s (x4 over 105s)  kubelet, k8s-slave1  Error: failed to start container "install": Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "exec: \"mkdir -p /var/log/nginx\": stat mkdir -p /var/log/nginx: no such file or directory": unknown
  </code></pre>