花了一个上午来追踪问题，k8s都反复新建了十多次，docker都重启了几次。(一次显示不有获取磁盘空间，重启docker，清空存储解决)
在用kubeadm安装容器化的几个组件时，flannel组件死活不能启动，报如下问题：
Failed to create SubnetManager: error retrieving pod spec for 'kube-system/kube-flannel-ds-xxx': the server does not allow access to the requested resource.
在如下Url找到解决办法：
http://blog.csdn.net/ximenghappy/article/details/70157361
明天搞DNS和节点加入....
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Kubernetes一共提供五种网络组件，可以根据自己的需要选择。我使用的Flannel网络，此处1.5.5和1.6.1也是不一样的，1.6.1加了RBAC。需要执行一下两个命令：
kubectl create -f https://github.com/coreos/flannel/raw/master/Documentation/kube-flannel-rbac.yml clusterrole "flannel" configured clusterrolebinding "flannel" configured kubectl create -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml serviceaccount "flannel" created configmap "kube-flannel-cfg" created daemonset "kube-flannel-ds" created
解决此问题参考：
https://github.com/kubernetes/kubernetes/issues/44029
https://github.com/kubernetes/kubeadm/issues/212#issuecomment-290908868
kube-flannel-rbac.yaml文件内容:
# Create the clusterrole and clusterrolebinding:
# $ kubectl create -f kube-flannel-rbac.yml
# Create the pod using the same namespace used by the flannel serviceaccount:
# $ kubectl create --namespace kube-system -f kube-flannel.yml
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: flannel
rules:
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-system
kube-flannel.yaml内容:
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: flannel
namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-system
labels:
tier: node
app: flannel
data:
cni-conf.json: |
{
"name": "cbr0",
"type": "flannel",
"delegate": {
"isDefaultGateway": true
}
}
net-conf.json: |
{
"Network": "10.244.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
name: kube-flannel-ds
namespace: kube-system
labels:
tier: node
app: flannel
spec:
template:
metadata:
labels:
tier: node
app: flannel
spec:
hostNetwork: true
nodeSelector:
beta.kubernetes.io/arch: amd64
tolerations:
- key: node-role.kubernetes.io/master
operator: Exists
effect: NoSchedule
serviceAccountName: flannel
containers:
- name: kube-flannel
image: quay.io/coreos/flannel-amd64:v0.7.1
command: [ "/opt/bin/flanneld", "--ip-masq", "--kube-subnet-mgr" ]
securityContext:
privileged: true
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run
- name: flannel-cfg
mountPath: /etc/kube-flannel/
- name: install-cni
image: quay.io/coreos/flannel-amd64:v0.7.1
command: [ "/bin/sh", "-c", "set -e -x; cp -f /etc/kube-flannel/cni-conf.json /etc/cni/net.d/10-flannel.conf; while true; do sleep 3600; done" ]
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg