title: kubernetes upgrade from 1.9.0 to 1.10 FATAL: could not decode configuration: unable to decode config from bytes
body: <p>I am trying to upgrade my 1.9.0 cluster to 1.10. kubeadm upgrade plan command giving below error message. How to resolve this error message</p>
  
  <pre><code> kubeadm upgrade plan
  [preflight] Running pre-flight checks.
  [upgrade] Making sure the cluster is healthy:
  [upgrade/config] Making sure the configuration is correct:
  [upgrade/config] Reading configuration from the cluster...
  [upgrade/config] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
  [upgrade/config] FATAL: could not decode configuration: unable to decode config from bytes: v1alpha1.MasterConfiguration: KubeProxy: v1alpha1.KubeProxy: Config: v1alpha1.KubeProxyConfiguration: FeatureGates: ReadMapCB: expect { or n, but found ", error found in #10 byte of ...|reGates":"","healthz|..., bigger context ...|24h0m0s"},"enableProfiling":false,"featureGates":"","healthzBindAddress":"0.0.0.0:10256","hostnameOv|...
  </code></pre>
  
  <p><strong>YAML config file output:</strong></p>
  
  <pre><code>apiVersion: v1
  data:
    MasterConfiguration: |
      api:
        advertiseAddress: 192.168.16.211
        bindPort: 6443
      authorizationModes:
      - Node
      - RBAC
      certificatesDir: /etc/kubernetes/pki
      cloudProvider: ""
      etcd:
        caFile: ""
        certFile: ""
        dataDir: /var/lib/etcd
        endpoints: null
        image: ""
        keyFile: ""
      imageRepository: gcr.io/google_containers
      kubeProxy:
        config:
          bindAddress: 0.0.0.0
          clientConnection:
            acceptContentTypes: ""
            burst: 10
            contentType: application/vnd.kubernetes.protobuf
            kubeconfig: /var/lib/kube-proxy/kubeconfig.conf
            qps: 5
          clusterCIDR: 10.244.0.0/16
          configSyncPeriod: 15m0s
          conntrack:
            max: null
            maxPerCore: 32768
            min: 131072
            tcpCloseWaitTimeout: 1h0m0s
            tcpEstablishedTimeout: 24h0m0s
          enableProfiling: false
          featureGates: ""
          healthzBindAddress: 0.0.0.0:10256
          hostnameOverride: ""
          iptables:
            masqueradeAll: false
            masqueradeBit: 14
            minSyncPeriod: 0s
            syncPeriod: 30s
          ipvs:
            minSyncPeriod: 0s
            scheduler: ""
            syncPeriod: 30s
          metricsBindAddress: 127.0.0.1:10249
          mode: ""
          oomScoreAdj: -999
          portRange: ""
          resourceContainer: /kube-proxy
          udpTimeoutMilliseconds: 250ms
      kubeletConfiguration: {}
      kubernetesVersion: v1.9.0
      networking:
        dnsDomain: cluster.local
        podSubnet: 10.244.0.0/16
        serviceSubnet: 10.96.0.0/12
      nodeName: k8sm-01
      token: ""
      tokenTTL: 24h0m0s
      unifiedControlPlaneImage: ""
  kind: ConfigMap
  metadata:
    creationTimestamp: 2017-10-06T20:44:05Z
    name: kubeadm-config
    namespace: kube-system
    resourceVersion: "2462269"
    selfLink: /api/v1/namespaces/kube-system/configmaps/kubeadm-config
    uid: 1818b79c-aad7-11e7-9ef5-525400ada096
  </code></pre>