Kubernetes (xii) the deployment of K8s cluster network (flannel)

cni is an interface k8s, if necessary docking k8s need to follow cni interface standard, mainly for deployment cni turned a third-party network;

For third-party plug-ins to achieve network  https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/

 

About cni installation planning and flanel

• cni installed on each node to node
• flannel mounted to the master node

node node installation cni

cni binary package Download: https://github.com/containernetworking/plugins/releases

First, download the installation package cni

wget  https://github.com/containernetworking/plugins/releases/download/v0.8.5/cni-plugins-linux-amd64-v0.8.5.tgz

 

Second, extract the installation package cni

mkdir -p / opt / cni / bin # working directory

mkdir -p /etc/cni/net.d # Profiles

tar -zxvf  cni-plugins-linux-amd64-v0.8.5.tgz -C /opt/cni/bin

 

master node installation flannel

Third, we installed flannel

flannel installation tutorial  https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/

 

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml

or

Use our ready yaml files (Recommended)

 

flannel.yaml
4.9 KB

note:

• The flannel only need to install the master node
• This file needs over the wall, executed directly downloaded to the server after kubectl apply -f kube-flannel.yml (inside the mirror needs over the wall, foreign direct installation will fail, not recommended)
• yaml inside the network and for net-conf.json cat /opt/kubernetes/cfg/kube-controller-manager.conf inside the cluster-cidr values ​​agree
• If you do not use flannel, other components, too

Fourth, the implementation ymal

kubectl apply -f kube-flannel.yml

 

V. After installation view

kubectl get pods -n kube-system

 

The following output

NAME READY STATUS RESTARTS AGE
kube-flannel-ds-amd64-q8rmk 1/1 Running 0 19m
kube-flannel-ds-amd64-zq7hc 1/1 Running 0 19m
 

1/1 represents a successful start, 0/1 indicates failed to start

 

VI View pod

After installation, each node will start a pod

NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-flannel-ds-amd64-q8rmk 1/1 Running 0 18m 172.19.216.179 k8s-node1 <none> <none>
kube-flannel-ds-amd64-zq7hc 1/1 Running 0 18m 172.19.216.180 k8s-node2 <none> <none>

 

Seven, we look flannel card in each node node

We will see through ifconfig node has a flannel card