title: unexpected error storing fake SSL Cert: could not create PEM certificate
body: <pre><code>-------------------------------------------------------------------------------
  NGINX Ingress controller
    Release:       0.26.1
    Build:         git-2de5a893a
    Repository:    https://github.com/kubernetes/ingress-nginx
    nginx version: openresty/1.15.8.2
  
  -------------------------------------------------------------------------------
  
  W0719 06:58:01.543840       6 flags.go:243] SSL certificate chain completion is disabled (--enable-ssl-chain-completion=false)
  W0719 06:58:01.544045       6 client_config.go:541] Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.
  I0719 06:58:01.544341       6 main.go:182] Creating API client for https://10.233.0.1:443
  I0719 06:58:01.558257       6 main.go:226] Running in Kubernetes cluster version v1.16 (v1.16.3) - git (clean) commit b3cbbae08ec52a7fc73d334838e18d17e8512749 - platform linux/amd64
  F0719 06:58:01.857260       6 ssl.go:389] unexpected error storing fake SSL Cert: could not create PEM certificate file /etc/ingress-controller/ssl/default-fake-certificate.pem: open /etc/ingress-controller/ssl/default-fake-certificate.pem: permission denied
  
  </code></pre>
  <h3 id="my-ingress-controller-has-3-replicas-but-2-replicas-are-normal1-replica-is-excption-0oli">1. my ingress-controller has 3 replicas ,but 2 replicas are normal，1 replica is excption。</h3>
  <p>I am a Chinese，I can speak English just little。Welcome to help answer</p>