title: metrics-server with CrashLoopBackOff
body: <p>I´m not able to run the metrics-server pod, it gets to crashloopbackoff error. Running "kubectl get pods -n kube-system" I see the following output:</p>
  
  <pre><code>NAME READY STATUS RESTARTS AGE
  calico-kube-controllers-6b9d4c8765-mht4w 1/1 Running 0 17m
  calico-node-2rmzg 1/1 Running 0 17m
  coredns-6955765f44-87kbn 1/1 Running 0 57m
  coredns-6955765f44-wzrrt 1/1 Running 0 57m
  etcd-master-node 1/1 Running 0 56m
  kube-apiserver-master-node 1/1 Running 0 56m
  kube-controller-manager-master-node 1/1 Running 0 56m
  kube-flannel-ds-amd64-6htmh 1/1 Running 0 28m
  kube-proxy-xvksz 1/1 Running 0 57m
  kube-scheduler-master-node 1/1 Running 0 56m
  metrics-server-7d9ffcffbd-r4gf9 0/1 CrashLoopBackOff 7 16m
  </code></pre>
  
  <p>Then, running "kubectl describe pods metrics-server -n kube-system" I see the following:</p>
  
  <pre><code>Name: metrics-server-7d9ffcffbd-r4gf9
  Namespace: kube-system
  Priority: 0
  Node: master-node/10.221.194.166
  Start Time: Thu, 30 Jan 2020 17:07:37 -0300
  Labels: k8s-app=metrics-server
  pod-template-hash=7d9ffcffbd
  Annotations: cni.projectcalico.org/podIP: 192.168.77.133/32
  Status: Running
  IP: 192.168.77.133
  IPs:
  IP: 192.168.77.133
  Controlled By: ReplicaSet/metrics-server-7d9ffcffbd
  Containers:
  metrics-server:
  Container ID: docker://90ccb84ccf10b130ac93620d105d80c244208b8753c48bb498d646cd3e0c5c17
  Image: k8s.gcr.io/metrics-server-amd64:v0.3.6
  Image ID: docker-pullable://k8s.gcr.io/metrics-server-amd64@sha256:c9c4e95068b51d6b33a9dccc61875df07dc650abbf4ac1a19d58b4628f89288b
  Port: 4443/TCP
  Host Port: 0/TCP
  Command:
  /metrics-server
  --kubelet-insecure-tls
  --kubelet-preferred-address-types=InternalIP
  State: Waiting
  Reason: CrashLoopBackOff
  Last State: Terminated
  Reason: Error
  Exit Code: 2
  Started: Thu, 30 Jan 2020 17:24:10 -0300
  Finished: Thu, 30 Jan 2020 17:24:11 -0300
  Ready: False
  Restart Count: 8
  Environment:
  Mounts:
  /tmp from tmp-dir (rw)
  /var/run/secrets/kubernetes.io/serviceaccount from metrics-server-token-rxfq2 (ro)
  Conditions:
  Type Status
  Initialized True
  Ready False
  ContainersReady False
  PodScheduled True
  Volumes:
  tmp-dir:
  Type: EmptyDir (a temporary directory that shares a pod's lifetime)
  Medium:
  SizeLimit:
  metrics-server-token-rxfq2:
  Type: Secret (a volume populated by a Secret)
  SecretName: metrics-server-token-rxfq2
  Optional: false
  QoS Class: BestEffort
  Node-Selectors: beta.kubernetes.io/os=linux
  kubernetes.io/arch=amd64
  Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
  node.kubernetes.io/unreachable:NoExecute for 300s
  Events:
  Type Reason Age From Message
  
  Normal Scheduled 19m default-scheduler Successfully assigned kube-system/metrics-server-7d9ffcffbd-r4gf9 to master-node
  Normal Pulling 18m (x4 over 19m) kubelet, master-node Pulling image "k8s.gcr.io/metrics-server-amd64:v0.3.6"
  Normal Pulled 18m (x4 over 19m) kubelet, master-node Successfully pulled image "k8s.gcr.io/metrics-server-amd64:v0.3.6"
  Normal Created 18m (x4 over 19m) kubelet, master-node Created container metrics-server
  Normal Started 18m (x4 over 19m) kubelet, master-node Started container metrics-server
  Warning BackOff 4m5s (x72 over 19m) kubelet, master-node Back-off restarting failed container
  </code></pre>
  
  <p>Can someone help me figuring out what is wrong? I´ve seen a lot of similar cases, but none of them worked. Furthermore, I´m running all inside a master node.</p>
  
  <p>EDIT 1: Posting the output of log:</p>
  
  <pre><code>Error: error creating self-signed certificates: mkdir apiserver.local.config: read-only file system
  Usage:
     [flags]
  
  Flags:
        --alsologtostderr                                         log to standard error as well as files
        --authentication-kubeconfig string                        kubeconfig file pointing at the 'core' kubernetes server with enough rights to create tokenaccessreviews.authentication.k8s.io.
        --authentication-skip-lookup                              If false, the authentication-kubeconfig will be used to lookup missing authentication configuration from the cluster.
        --authentication-token-webhook-cache-ttl duration         The duration to cache responses from the webhook token authenticator. (default 10s)
        --authentication-tolerate-lookup-failure                  If true, failures to look up missing authentication configuration from the cluster are not considered fatal. Note that this can result in authentication that treats all requests as anonymous.
        --authorization-always-allow-paths strings                A list of HTTP paths to skip during authorization, i.e. these are authorized without contacting the 'core' kubernetes server.
        --authorization-kubeconfig string                         kubeconfig file pointing at the 'core' kubernetes server with enough rights to create subjectaccessreviews.authorization.k8s.io.
        --authorization-webhook-cache-authorized-ttl duration     The duration to cache 'authorized' responses from the webhook authorizer. (default 10s)
        --authorization-webhook-cache-unauthorized-ttl duration   The duration to cache 'unauthorized' responses from the webhook authorizer. (default 10s)
        --bind-address ip                                         The IP address on which to listen for the --secure-port port. The associated interface(s) must be reachable by the rest of the cluster, and by CLI/web clients. If blank, all interfaces will be used (0.0.0.0 for all IPv4 interfaces and :: for all IPv6 interfaces). (default 0.0.0.0)
        --cert-dir string                                         The directory where the TLS certs are located. If --tls-cert-file and --tls-private-key-file are provided, this flag will be ignored. (default "apiserver.local.config/certificates")
        --client-ca-file string                                   If set, any request presenting a client certificate signed by one of the authorities in the client-ca-file is authenticated with an identity corresponding to the CommonName of the client certificate.
        --contention-profiling                                    Enable lock contention profiling, if profiling is enabled
    -h, --help                                                    help for this command
        --http2-max-streams-per-connection int                    The limit that the server gives to clients for the maximum number of streams in an HTTP/2 connection. Zero means to use golang's default.
        --kubeconfig string                                       The path to the kubeconfig used to connect to the Kubernetes API server and the Kubelets (defaults to in-cluster config)
        --kubelet-certificate-authority string                    Path to the CA to use to validate the Kubelet's serving certificates.
        --kubelet-insecure-tls                                    Do not verify CA of serving certificates presented by Kubelets.  For testing purposes only.
        --kubelet-port int                                        The port to use to connect to Kubelets. (default 10250)
        --kubelet-preferred-address-types strings                 The priority of node address types to use when determining which address to use to connect to a particular node (default [Hostname,InternalDNS,InternalIP,ExternalDNS,ExternalIP])
        --log-flush-frequency duration                            Maximum number of seconds between log flushes (default 5s)
        --log_backtrace_at traceLocation                          when logging hits line file:N, emit a stack trace (default :0)
        --log_dir string                                          If non-empty, write log files in this directory
        --log_file string                                         If non-empty, use this log file
        --logtostderr                                             log to standard error instead of files (default true)
        --metric-resolution duration                              The resolution at which metrics-server will retain metrics. (default 1m0s)
        --profiling                                               Enable profiling via web interface host:port/debug/pprof/ (default true)
        --requestheader-allowed-names strings                     List of client certificate common names to allow to provide usernames in headers specified by --requestheader-username-headers. If empty, any client certificate validated by the authorities in --requestheader-client-ca-file is allowed.
        --requestheader-client-ca-file string                     Root certificate bundle to use to verify client certificates on incoming requests before trusting usernames in headers specified by --requestheader-username-headers. WARNING: generally do not depend on authorization being already done for incoming requests.
        --requestheader-extra-headers-prefix strings              List of request header prefixes to inspect. X-Remote-Extra- is suggested. (default [x-remote-extra-])
        --requestheader-group-headers strings                     List of request headers to inspect for groups. X-Remote-Group is suggested. (default [x-remote-group])
        --requestheader-username-headers strings                  List of request headers to inspect for usernames. X-Remote-User is common. (default [x-remote-user])
        --secure-port int                                         The port on which to serve HTTPS with authentication and authorization.If 0, don't serve HTTPS at all. (default 443)
        --skip_headers                                            If true, avoid header prefixes in the log messages
        --stderrthreshold severity                                logs at or above this threshold go to stderr
        --tls-cert-file string                                    File containing the default x509 Certificate for HTTPS. (CA cert, if any, concatenated after server cert). If HTTPS serving is enabled, and --tls-cert-file and --tls-private-key-file are not provided, a self-signed certificate and key are generated for the public address and saved to the directory specified by --cert-dir.
        --tls-cipher-suites strings                               Comma-separated list of cipher suites for the server. If omitted, the default Go cipher suites will be use.  Possible values: TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_RC4_128_SHA,TLS_RSA_WITH_3DES_EDE_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_RSA_WITH_AES_128_GCM_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_RC4_128_SHA
        --tls-min-version string                                  Minimum TLS version supported. Possible values: VersionTLS10, VersionTLS11, VersionTLS12
        --tls-private-key-file string                             File containing the default x509 private key matching --tls-cert-file.
        --tls-sni-cert-key namedCertKey                           A pair of x509 certificate and private key file paths, optionally suffixed with a list of domain patterns which are fully qualified domain names, possibly with prefixed wildcard segments. If no domain patterns are provided, the names of the certificate are extracted. Non-wildcard matches trump over wildcard matches, explicit domain patterns trump over extracted names. For multiple key/certificate pairs, use the --tls-sni-cert-key multiple times. Examples: "example.crt,example.key" or "foo.crt,foo.key:*.foo.com,foo.com". (default [])
    -v, --v Level                                                 number for the log level verbosity
        --vmodule moduleSpec                                      comma-separated list of pattern=N settings for file-filtered logging
  
  panic: error creating self-signed certificates: mkdir apiserver.local.config: read-only file system
  
  goroutine 1 [running]:
  main.main()
      /go/src/github.com/kubernetes-incubator/metrics-server/cmd/metrics-server/metrics-server.go:39 +0x13b
  </code></pre>
  
  <p>Thanks in advance :)</p>