<p>K8 Version:</p>

<pre><code>Client Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.4", GitCommit:"d6f433224538d4f9ca2f7ae19b252e6fcb66a3ae", GitTreeState:"clean", BuildDate:"2017-05-19T18:44:27Z", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.4", GitCommit:"d6f433224538d4f9ca2f7ae19b252e6fcb66a3ae", GitTreeState:"clean", BuildDate:"2017-05-19T18:33:17Z", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}
</code></pre>

<p>I tried to launch spinnaker pods(<a href="https://github.com/spinnaker/spinnaker/tree/master/experimental/kubernetes/simple/svcs" rel="noreferrer">yaml files here</a>). I choose <code>Flannel</code>(<code>kubectl apply -f kube-flannel.yml</code>) while installing K8. Then I see the pods are not starting, it is struck in "ContainerCreating" status. I <code>kubectl describe</code> a pod, showing  <code>NetworkPlugin cni failed to set up pod</code></p>

<pre><code>veeru@ubuntu:/opt/spinnaker/experimental/kubernetes/simple$ kubectl describe pod data-redis-master-v000-38j80 --namespace=spinnaker
Name:       data-redis-master-v000-38j80
Namespace:  spinnaker
Node:       ubuntu/192.168.6.136
Start Time: Thu, 01 Jun 2017 02:54:14 -0700
Labels:     load-balancer-data-redis-server=true
        replication-controller=data-redis-master-v000
Annotations:    kubernetes.io/created-by={"kind":"SerializedReference","apiVersion":"v1","reference":{"kind":"ReplicaSet","namespace":"spinnaker","name":"data-redis-master-v000","uid":"43d4a44c-46b0-11e7-b0e1-000c29b...
Status:     Pending
IP:     
Controllers:    ReplicaSet/data-redis-master-v000
Containers:
  redis-master:
    Container ID:   
    Image:      gcr.io/kubernetes-spinnaker/redis-cluster:v2
    Image ID:       
    Port:       6379/TCP
    State:      Waiting
      Reason:       ContainerCreating
    Ready:      False
    Restart Count:  0
    Limits:
      cpu:  100m
    Requests:
      cpu:  100m
    Environment:
      MASTER:   true
    Mounts:
      /redis-master-data from data (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-71p4q (ro)
Conditions:
  Type      Status
  Initialized   True 
  Ready     False 
  PodScheduled  True 
Volumes:
  data:
    Type:   EmptyDir (a temporary directory that shares a pod's lifetime)
    Medium: 
  default-token-71p4q:
    Type:   Secret (a volume populated by a Secret)
    SecretName: default-token-71p4q
    Optional:   false
QoS Class:  Burstable
Node-Selectors: &lt;none&gt;
Tolerations:    node.alpha.kubernetes.io/notReady=:Exists:NoExecute for 300s
        node.alpha.kubernetes.io/unreachable=:Exists:NoExecute for 300s
Events:
  FirstSeen LastSeen    Count   From            SubObjectPath   Type        Reason      Message
  --------- --------    -----   ----            -------------   --------    ------      -------
  45m       45m     1   default-scheduler           Normal      Scheduled   Successfully assigned data-redis-master-v000-38j80 to ubuntu
  43m       43m     1   kubelet, ubuntu             Warning     FailedSync  Error syncing pod, skipping: failed to "KillPodSandbox" for "447d302c-46b0-11e7-b0e1-000c29b1270f" with KillPodSandboxError: "rpc error: code = 2 desc = NetworkPlugin cni failed to teardown pod \"_\" network: CNI failed to retrieve network namespace path: Error: No such container: 8265d80732e7b73ebf8f1493d40403021064b61436c4c559b41330e7592fd47f"

  43m   43m 1   kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: rpc error: code = 2 desc = Error: No such container: b972862d763e621e026728073deb9a304748c4ec4522982db0a168663ab59d36
  42m   42m 1   kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: failed to "KillPodSandbox" for "447d302c-46b0-11e7-b0e1-000c29b1270f" with KillPodSandboxError: "rpc error: code = 2 desc = NetworkPlugin cni failed to teardown pod \"_\" network: CNI failed to retrieve network namespace path: Error: No such container: 72b39083a3a81c0da1d4b7fa65b5d6450b62a3562a05452c27b185bc33197327"

  41m   41m 1   kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: failed to "KillPodSandbox" for "447d302c-46b0-11e7-b0e1-000c29b1270f" with KillPodSandboxError: "rpc error: code = 2 desc = NetworkPlugin cni failed to teardown pod \"_\" network: CNI failed to retrieve network namespace path: Error: No such container: d315511bfa9f6f09d7ef4cd277bde44e4885291ea566e3089460356c1ed34413"

  40m   40m 1   kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: failed to "KillPodSandbox" for "447d302c-46b0-11e7-b0e1-000c29b1270f" with KillPodSandboxError: "rpc error: code = 2 desc = NetworkPlugin cni failed to teardown pod \"_\" network: CNI failed to retrieve network namespace path: Error: No such container: a03d776d2d7c5c4ae9c1ec31681b0b6e40759326a452916cff0e60c4d4e2c954"

  40m   40m 1   kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: failed to "KillPodSandbox" for "447d302c-46b0-11e7-b0e1-000c29b1270f" with KillPodSandboxError: "rpc error: code = 2 desc = NetworkPlugin cni failed to teardown pod \"_\" network: CNI failed to retrieve network namespace path: Error: No such container: acf30a4aacda0c53bdbb8bc2d416704720bd1b623c43874052b4029f15950052"

  39m   39m 1   kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: failed to "KillPodSandbox" for "447d302c-46b0-11e7-b0e1-000c29b1270f" with KillPodSandboxError: "rpc error: code = 2 desc = NetworkPlugin cni failed to teardown pod \"_\" network: CNI failed to retrieve network namespace path: Error: No such container: ea49f5f9428d585be7138f4ebce54f713eef549b16104a3d7aa728175b6ebc2a"

  38m   38m 1   kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: failed to "KillPodSandbox" for "447d302c-46b0-11e7-b0e1-000c29b1270f" with KillPodSandboxError: "rpc error: code = 2 desc = NetworkPlugin cni failed to teardown pod \"_\" network: CNI failed to retrieve network namespace path: Error: No such container: ec2483435b4b22576c9bd7bffac5d67d53893c189c0cf26aca1ae6af79d09914"

  38m   1m  39  kubelet, ubuntu     Warning FailedSync  (events with common reason combined)
  45m   1s  448 kubelet, ubuntu     Normal  SandboxChanged  Pod sandbox changed, it will be killed and re-created.
  45m   0s  412 kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: failed to "CreatePodSandbox" for "data-redis-master-v000-38j80_spinnaker(447d302c-46b0-11e7-b0e1-000c29b1270f)" with CreatePodSandboxError: "CreatePodSandbox for pod \"data-redis-master-v000-38j80_spinnaker(447d302c-46b0-11e7-b0e1-000c29b1270f)\" failed: rpc error: code = 2 desc = NetworkPlugin cni failed to set up pod \"data-redis-master-v000-38j80_spinnaker\" network: open /run/flannel/subnet.env: no such file or directory"
</code></pre>

<p>How can I resolve above issue?  </p>

<p><strong>UPDATE-1</strong></p>

<p>I have reinitialized K8 with <code>kubeadm init --pod-network-cidr=10.244.0.0/16</code> and deployed sample <a href="http://containertutorials.com/get_started_kubernetes/k8s_example.html" rel="noreferrer">nginx pod</a>. Still getting same error</p>

<pre><code>-----------------OUTPUT REMOVED------------------------------- 
Events:
  FirstSeen LastSeen    Count   From            SubObjectPath   Type        Reason      Message
  --------- --------    -----   ----            -------------   --------    ------      -------
  3m        3m      1   default-scheduler           Normal      Scheduled   Successfully assigned nginx-622qj to ubuntu
  1m        1m      1   kubelet, ubuntu             Warning     FailedSync  Error syncing pod, skipping: failed to "KillPodSandbox" for "0728fece-46fe-11e7-ae5d-000c29b1270f" with KillPodSandboxError: "rpc error: code = 2 desc = NetworkPlugin cni failed to teardown pod \"_\" network: CNI failed to retrieve network namespace path: Error: No such container: 38250afd765f0108aeff6e31bbe5a642a60db99b97cbbf15711f810cbe8f3829"

  24s   24s 1   kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: failed to "KillPodSandbox" for "0728fece-46fe-11e7-ae5d-000c29b1270f" with KillPodSandboxError: "rpc error: code = 2 desc = NetworkPlugin cni failed to teardown pod \"_\" network: CNI failed to retrieve network namespace path: Error: No such container: 3bebcef02cb5f6645a65dcf06b2730144080f9d3c4fb18267feca5c5ce21031c"

  2m    9s  33  kubelet, ubuntu     Normal  SandboxChanged  Pod sandbox changed, it will be killed and re-created.
  3m    7s  32  kubelet, ubuntu     Warning FailedSync  Error syncing pod, skipping: failed to "CreatePodSandbox" for "nginx-622qj_default(0728fece-46fe-11e7-ae5d-000c29b1270f)" with CreatePodSandboxError: "CreatePodSandbox for pod \"nginx-622qj_default(0728fece-46fe-11e7-ae5d-000c29b1270f)\" failed: rpc error: code = 2 desc = NetworkPlugin cni failed to set up pod \"nginx-622qj_default\" network: open /run/flannel/subnet.env: no such file or directory"
</code></pre>

<p>Running the following command resolved my issues:</p>

<pre><code>kubeadm init --pod-network-cidr=10.244.0.0/16
</code></pre>

<p>For flannel as cni the api server needs to have the argument <code>--pod-network-cidr=...</code> to be set to the overlay. </p>
