kubeadm 搭建K8S 1.18集群--部署flannel

原创

陈不成i

修改于 2021-07-01 18:09:41

8790

修改于 2021-07-01 18:09:41

文章被收录于专栏：ops技术分享

1.由于容器的网络暂时还没有，coredns无法分配的ip会处于pending状态，这里需要手动部署flannel插件

[root@k8s-01 ~]# kubectl -n kube-system get pod -o wide
NAME                             READY   STATUS    RESTARTS   AGE     IP               NODE     NOMINATED NODE   READINESS GATES
coredns-78c7b4d59d-c4dcl         0/1     Pending   0          45m                              
coredns-78c7b4d59d-d6rrv         0/1     Pending   0          45m                              
etcd-k8s-01                      1/1     Running   0          46m     192.168.31.100   k8s-01              
etcd-k8s-02                      1/1     Running   0          28m     192.168.31.101   k8s-02              
etcd-k8s-03                      1/1     Running   0          27m     192.168.31.102   k8s-03              
kube-apiserver-k8s-01            1/1     Running   0          46m     192.168.31.100   k8s-01              
kube-apiserver-k8s-02            1/1     Running   0          28m     192.168.31.101   k8s-02              
kube-apiserver-k8s-03            1/1     Running   0          27m     192.168.31.102   k8s-03              
kube-controller-manager-k8s-01   1/1     Running   1          46m     192.168.31.100   k8s-01              
kube-controller-manager-k8s-02   1/1     Running   0          28m     192.168.31.101   k8s-02              
kube-controller-manager-k8s-03   1/1     Running   0          27m     192.168.31.102   k8s-03              
kube-proxy-7rlb4                 1/1     Running   0          27m     192.168.31.102   k8s-03              
kube-proxy-c8kbl                 1/1     Running   0          45m     192.168.31.100   k8s-01              
kube-proxy-f87b8                 1/1     Running   0          28m     192.168.31.101   k8s-02              
kube-proxy-pcx6p                 1/1     Running   1          2m59s   192.168.31.104   k8s-05              
kube-proxy-zscwf                 1/1     Running   1          3m4s    192.168.31.103   k8s-04              
kube-scheduler-k8s-01            1/1     Running   1          46m     192.168.31.100   k8s-01              
kube-scheduler-k8s-02            1/1     Running   0          28m     192.168.31.101   k8s-02              
kube-scheduler-k8s-03            1/1     Running   0          27m     192.168.31.102   k8s-03

2.安装flannel

#手动打patch，后续扩的node也记得打下
nodes=`kubectl get node --no-headers | awk '{print $1}'`
for node in $nodes;do
    cidr=`kubectl get node "$node" -o jsonpath='{.spec.podCIDRs[0]}'`
    [ -z "$(kubectl get node $node -o jsonpath='{.spec.podCIDR}')" ] && {
        kubectl patch node "$node" -p '{"spec":{"podCIDR":"'"$cidr"'"}}' 
    }
done
wget http://down.i4t.com/k8s1.18/kube-flannel.yml
kubectl apply -f kube-flannel.yml

3.flannel如果存在多网卡，需要在kube-flannel.yml中指定网卡

     containers:
      - name: kube-flannel
        image: quay.io/coreos/flannel:v0.12.0-amd64
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        - --iface=eth0  # 如果是多网卡的话，指定内网网卡的名称

温馨提示: 在kubeadm.yaml文件中设置了podSubnet网段，同时在flannel中网段也要设置相同的。（我这里默认就是相同的配置）

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