How to solve flannel evicted?

#flannelだけがEvictedで動かない、、、
```shell
# kubectl get pods --all-namespaces
NAMESPACE     NAME                              READY   STATUS    RESTARTS   AGE
kube-system   coredns-6955765f44-g9x8l          0/1     Pending   0          19m
kube-system   coredns-6955765f44-wr6zb          0/1     Pending   0          19m
kube-system   etcd-cal                          1/1     Running   0          19m
kube-system   kube-apiserver-calo               1/1     Running   0          19m
kube-system   kube-controller-manager-cal       1/1     Running   0          19m
kube-system   kube-flannel-ds-amd64-s9d7l       0/1     Evicted   0          46s
kube-system   kube-proxy-hsbxf                  1/1     Running   0          19m
kube-system   kube-scheduler-cal                1/1     Running   0          19m
```

#kubectl describe nodeでステータスを確認
```shell
#kubectl describe node
Name:           kube-flannel-ds-amd64-cskpw
Namespace:      kube-system
Priority:       0
Node:           cal/
Start Time:     Fri, 10 Jan 2020 23:12:14 +0900
Labels:         app=flannel
                controller-revision-hash=67f65bfbc7
                pod-template-generation=1
                tier=node
Annotations:    <none>
Status:         Failed
Reason:         Evicted
Message:        Pod The node had condition: [DiskPressure].
IP:
IPs:            <none>
Controlled By:  DaemonSet/kube-flannel-ds-amd64
Init Containers:
  install-cni:
    Image:      quay.io/coreos/flannel:v0.11.0-amd64
    Port:       <none>
    Host Port:  <none>
    Command:
      cp
    Args:
      -f
      /etc/kube-flannel/cni-conf.json
      /etc/cni/net.d/10-flannel.conflist
    Environment:  <none>
    Mounts:
      /etc/cni/net.d from cni (rw)
      /etc/kube-flannel/ from flannel-cfg (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from flannel-token-sq5fq (ro)
Containers:
  kube-flannel:
    Image:      quay.io/coreos/flannel:v0.11.0-amd64
    Port:       <none>
    Host Port:  <none>
    Command:
      /opt/bin/flanneld
    Args:
      --ip-masq
      --kube-subnet-mgr
    Limits:
      cpu:     100m
      memory:  50Mi
    Requests:
      cpu:     100m
      memory:  50Mi
    Environment:
      POD_NAME:       kube-flannel-ds-amd64-cskpw (v1:metadata.name)
      POD_NAMESPACE:  kube-system (v1:metadata.namespace)
    Mounts:
      /etc/kube-flannel/ from flannel-cfg (rw)
      /run/flannel from run (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from flannel-token-sq5fq (ro)
Volumes:
  run:
    Type:          HostPath (bare host directory volume)
    Path:          /run/flannel
    HostPathType:
  cni:
    Type:          HostPath (bare host directory volume)
    Path:          /etc/cni/net.d
    HostPathType:
  flannel-cfg:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      kube-flannel-cfg
    Optional:  false
  flannel-token-sq5fq:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  flannel-token-sq5fq
    Optional:    false
QoS Class:       Guaranteed
Node-Selectors:  <none>
Tolerations:     :NoSchedule
                 node.kubernetes.io/disk-pressure:NoSchedule
                 node.kubernetes.io/memory-pressure:NoSchedule
                 node.kubernetes.io/network-unavailable:NoSchedule
                 node.kubernetes.io/not-ready:NoExecute
                 node.kubernetes.io/pid-pressure:NoSchedule
                 node.kubernetes.io/unreachable:NoExecute
                 node.kubernetes.io/unschedulable:NoSchedule
Events:
  Type     Reason     Age    From               Message
  ----     ------     ----   ----               -------
  Normal   Scheduled  6m29s  default-scheduler  Successfully assigned kube-system/kube-flannel-ds-amd64-cskpw to cal
  Warning  Evicted    6m29s  kubelet, cal   The node had condition: [DiskPressure].
```

#DiskPressure=ディスク容量が足りない
##HDDの空き容量を350GBほど確保
```shell
# df -h
Filesystem                  Size  Used Avail Use% Mounted on
udev                         16G     0   16G   0% /dev
tmpfs                       3.2G  3.4M  3.2G   1% /run
/dev/sdd2                   1.8T  1.4T  374G  79% /
tmpfs                        16G     0   16G   0% /dev/shm
tmpfs                       5.0M  4.0K  5.0M   1% /run/lock
tmpfs                        16G     0   16G   0% /sys/fs/cgroup
```

#空き容量確保後
```shell
# kubectl get pods --all-namespaces
NAMESPACE     NAME                              READY   STATUS    RESTARTS   AGE
kube-system   coredns-6955765f44-g9x8l          1/1     Running   0          19m
kube-system   coredns-6955765f44-wr6zb          1/1     Running   0          19m
kube-system   etcd-cal                          1/1     Running   0          19m
kube-system   kube-apiserver-cal                1/1     Running   0          19m
kube-system   kube-controller-manager-cal       1/1     Running   0          19m
kube-system   kube-flannel-ds-amd64-s9d7l       0/1     Running   0          46s
kube-system   kube-proxy-hsbxf                  1/1     Running   0          19m
kube-system   kube-scheduler-cal                1/1     Running   0          19m
```