kubeadm 安装

在Centos7.0系统，加入安装源路径

[root@web-test-01 ~]#cd /etc/yum.repos.d
[root@web-test-01 ~]#wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

[root@web-test-01 ~]#vim kubenetes.repo
[kubernetes]
name=Kubernetes Repo
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
enabled=1

master节点安装

[root@web-test-01 ~]#yum install docker-ce kubelet kubeadm kubectl 

node节点安装

[root@web-test-01 ~]#yum install docker-ce kubelet kubeadm 

初始化k8s

[root@web-test-01 ~]#kubeadm init --kubernetes-version=v1.17.3 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap 

会出现被墙的问题，那我们查看需要依赖的镜像

#master
[root@web-test-01 ~]#kubeadm config images list
k8s.gcr.io/kube-apiserver:v1.17.3
k8s.gcr.io/kube-controller-manager:v1.17.3
k8s.gcr.io/kube-scheduler:v1.17.3
k8s.gcr.io/kube-proxy:v1.17.3
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.4.3-0
k8s.gcr.io/coredns:1.6.5

如需要镜像文件请入群QQ 1005491328下载，加载镜像如下

docker image load -i kube-apiserver.tar.gz

node节点需要pull完成的相关镜像

#node
k8s.gcr.io/kube-proxy  
k8s.gcr.io/pause 
quay.io/coreos/flannel

init启动完成后会显示join命令，记得保存，按照提示操作，在节点运行命令加入k8s集群

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 121.71.157.127:6443 --token v5q11k.cft1mtn1dywgws9 \
    --discovery-token-ca-cert-hash sha256:322430bb222225901111102662a6b460575adc3c61313d080375f4fa5150ad3c93

coredns依赖flannel组件，未安装flannel时候查看coredns的状态为pending

#master
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
或者
docker pull quay.io/coreos/flannel:v0.11.0-amd64

查看状态

[root@web-test-01 kubetest]# kubectl get componentstatus
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok
scheduler            Healthy   ok
etcd-0               Healthy   {"health":"true"}

[root@web-test-01 kubetest]# kubectl get nodes
NAME          STATUS   ROLES    AGE     VERSION
web-sim-01    Ready    <none>   2m25s   v1.17.3
web-test-01   Ready    master   40m     v1.17.3