安装虚拟机
1.安装3台虚拟机，或者使用其他物理机都OK；
2.三台IP地址分别为：192.168.222.135,192.168.222.139,192.168.222.140
2.设置hostname，master节点设置
hostnamectl set-hostname master
3.两个node节点设置
hostnamectl set-hostname node1
4.退出shell重新登录
安装组件
1.在三台服务器上都安装docker、kubelet、kubeadm、kubectl，这里有个脚本，大家可以拿来使用。
~]# vi setup.sh
以下内容复制进文件
#/bin/sh
# install some tools
sudo yum install -y vim telnet bind-utils wget
sudo bash -c 'cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF'
# install and start docker
sudo yum install -y docker
sudo systemctl enable docker && sudo systemctl start docker
# Verify docker version is 1.12 and greater.
sudo setenforce 0
# install kubeadm, kubectl, and kubelet.
sudo yum install -y kubelet kubeadm kubectl
sudo bash -c 'cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward=1
EOF'
sudo sysctl --system
sudo systemctl stop firewalld
sudo systemctl disable firewalld
sudo swapoff -a
sudo systemctl enable kubelet && sudo systemctl start kubelet
2.将setup.sh复制到另外两台服务器上
scp setup.sh root@192.168.222.139:/root/
scp setup.sh root@192.168.222.140:/root/
3.分别在三台服务器上执行这个脚本,脚本其实就是安装一些组件，大家都应该能看得懂。
sh setup.sh
安装确认
分别在三台机器上运行以下命令，确认是否安装完毕需要的组件
[root@node2 ~]# which kubeadm
/usr/bin/kubeadm
[root@node2 ~]# which kubelet
/usr/bin/kubelet
[root@node2 ~]# which kubectl
/usr/local/bin/kubectl
[root@node2 ~]# docker version
Client:
Version: 1.13.1
API version: 1.26
Package version: docker-1.13.1-94.gitb2f74b2.el7.centos.x86_64
Go version: go1.10.3
Git commit: b2f74b2/1.13.1
Built: Tue Mar 12 10:27:24 2019
OS/Arch: linux/amd64
Server:
Version: 1.13.1
API version: 1.26 (minimum version 1.12)
Package version: docker-1.13.1-94.gitb2f74b2.el7.centos.x86_64
Go version: go1.10.3
Git commit: b2f74b2/1.13.1
Built: Tue Mar 12 10:27:24 2019
OS/Arch: linux/amd64
Experimental: false
确认没问题后进入下一个步骤
master配置
1.主节点上进行kubeadmin init
sudo kubeadm init --pod-network-cidr 172.100.0.0/16 --apiserver-advertise-address 192.168.222.135
#--pod-network-cidr：pod节点的网段
#--apiserver-advertise-address：apiserver的IP地址，这里写成master节点的IP即可
#-**-apiserver-cert-extra-sans: 如果需要使用公网IP，加上这一条，并且后面加上你的公网IP地址**
2.如果发现拉取镜像失败，我是拉取失败了~~~~ 所以去百度了一下，我们通过 docker.io/mirrorgooglecontainers 中转一下，运行以下命令，直接复制即可
kubeadm config images list |sed -e 's/^/docker pull /g' -e 's#k8s.gcr.io#docker.io/mirrorgooglecontainers#g' |sh -x
docker images |grep mirrorgooglecontainers |awk '{print "docker tag ",$1":"$2,$1":"$2}' |sed -e 's#docker.io/mirrorgooglecontainers#k8s.gcr.io#2' |sh -x
docker images |grep mirrorgooglecontainers |awk '{print "docker rmi ", $1":"$2}' |sh -x
docker pull coredns/coredns:1.2.2
docker tag coredns/coredns:1.2.2 k8s.gcr.io/coredns:1.3.1
docker rmi coredns/coredns:1.2.2
查看镜像列表，没毛病，如果发现init还报错的话，按照kubeadm的报错信息更改下docker镜像的tag，具体各位百度下吧
[root@master ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
k8s.gcr.io/kube-proxy v1.14.1 20a2d7035165 2 days ago 82.1 MB
k8s.gcr.io/kube-apiserver v1.14.1 cfaa4ad74c37 2 days ago 210 MB
k8s.gcr.io/kube-controller-manager v1.14.1 efb3887b411d 2 days ago 158 MB
k8s.gcr.io/kube-scheduler v1.14.1 8931473d5bdb 2 days ago 81.6 MB
k8s.gcr.io/etcd 3.3.10 2c4adeb21b4f 4 months ago 258 MB
k8s.gcr.io/coredns 1.3.1 367cdc8433a4 7 months ago 39.2 MB
k8s.gcr.io/pause 3.1 da86e6ba6ca1 15 months ago 742 kB
3.kubeadm输出的主要信息，如下
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 192.168.222.135:6443 --token srbxk3.x6xo6nhv3a4ng08m \
--discovery-token-ca-cert-hash sha256:b302232cbf1c5f3d418cea5553b641181d4bb384aadbce9b1d97b37cde477773
4.运行kubeadm配置
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
5.安装网络插件
kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
6.确认是否安装完成，查看pod内是否有weave-net即可
[root@master ~]# kubectl get pod --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-fb8b8dccf-glszh 1/1 Running 0 23m
kube-system coredns-fb8b8dccf-xcmtx 1/1 Running 0 23m
kube-system etcd-master 1/1 Running 0 22m
kube-system kube-apiserver-master 1/1 Running 0 22m
kube-system kube-controller-manager-master 1/1 Running 0 22m
kube-system kube-proxy-z84wh 1/1 Running 0 23m
kube-system kube-scheduler-master 1/1 Running 0 22m
kube-system weave-net-phwjz 2/2 Running 0 95s
加入node
1.在两台node上分别运行主要信息内的命令，如下（这个不能复制，需要查看自己的kubeadm输出的信息）：
kubeadm join 192.168.222.135:6443 --token srbxk3.x6xo6nhv3a4ng08m \
--discovery-token-ca-cert-hash sha256:b302232cbf1c5f3d418cea5553b641181d4bb384aadbce9b1d97b37cde477773
2.加入节点之后，发现node一直处于notready状态，好纠结
[root@master bin]# kubectl get node
NAME STATUS ROLES AGE VERSION
master Ready master 167m v1.14.1
node1 NotReady <none> 142m v1.14.1
node2 NotReady <none> 142m v1.14.1
3.查看pod节点，发现weave没启动
[root@master bin]# kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-fb8b8dccf-glszh 1/1 Running 1 168m
kube-system coredns-fb8b8dccf-xcmtx 1/1 Running 1 168m
kube-system etcd-master 1/1 Running 1 167m
kube-system kube-apiserver-master 1/1 Running 1 167m
kube-system kube-controller-manager-master 1/1 Running 1 167m
kube-system kube-proxy-bq2rf 0/1 ContainerCreating 0 143m
kube-system kube-proxy-m8f7z 0/1 ContainerCreating 0 143m
kube-system kube-proxy-z84wh 1/1 Running 1 168m
kube-system kube-scheduler-master 1/1 Running 1 167m
kube-system weave-net-8xmpx 0/2 ContainerCreating 0 143m
kube-system weave-net-phwjz 2/2 Running 4 147m
kube-system weave-net-xwqwm 0/2 ContainerCreating 0 143m
4.使用describe pods发现报错，没有拉取镜像，可是本机上已经有k8s.gcr.io/pause:3.1 镜像了，在不懈的努力下，终于知道了，原来node节点上也需要该镜像
kubectl describe pods --namespace=kube-system weave-net-8xmpx
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedCreatePodSandBox 77m (x8 over 120m) kubelet, node2 Failed create pod sandbox: rpc error: code = Unknown desc = failed pulling image "k8s.gcr.io/pause:3.1": Get https://k8s.gcr.io/v1/_ping: dial tcp 64.233.189.82:443: connect: connection refused
Warning FailedCreatePodSandBox 32m (x9 over 91m) kubelet, node2 Failed create pod sandbox: rpc error: code = Unknown desc = failed pulling image "k8s.gcr.io/pause:3.1": Get https://k8s.gcr.io/v1/_ping: dial tcp 64.233.188.82:443: connect: connection refused
Warning FailedCreatePodSandBox 22m (x23 over 133m) kubelet, node2 Failed create pod sandbox: rpc error: code = Unknown desc = failed pulling image "k8s.gcr.io/pause:3.1": Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.97.82:443: connect: connection refused
Warning FailedCreatePodSandBox 17m (x56 over 125m) kubelet, node2 Failed create pod sandbox: rpc error: code = Unknown desc = failed pulling image "k8s.gcr.io/pause:3.1": Get https://k8s.gcr.io/v1/_ping: dial tcp 74.125.203.82:443: connect: connection refused
Warning FailedCreatePodSandBox 12m (x24 over 110m) kubelet, node2 Failed create pod sandbox: rpc error: code = Unknown desc = failed pulling image "k8s.gcr.io/pause:3.1": Get https://k8s.gcr.io/v1/_ping: dial tcp 74.125.204.82:443: connect: connection refused
Warning FailedCreatePodSandBox 2m31s (x20 over 96m) kubelet, node2 Failed create pod sandbox: rpc error: code = Unknown desc = failed pulling image "k8s.gcr.io/pause:3.1": Get https://k8s.gcr.io/v1/_ping: dial tcp 108.177.125.82:443: connect: connection refused
5.node节点下载该镜像，分别运行以下命令，执行后发现还需要k8s.gcr.io/kube-proxy:v1.14.1 该镜像，那么一起处理吧（pull的镜像版本可以自己改，不改的话根据我的命令执行也可以）。
docker pull mirrorgooglecontainers/pause:3.1
docker tag docker.io/mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.11.3
docker tag docker.io/mirrorgooglecontainers/kube-proxy-amd64:v1.11.3 k8s.gcr.io/kube-proxy:v1.14.1
6.大功告成
创建一个pod测试
1.配置一个yml文件
vim nginx.yml
apiVersion: v1
kind: Pod
metadata:
name: nginx
labels:
app: web
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
2.创建pod
kubectl create -f nginx.yml
3.查看IP并访问
[root@master ~]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx 1/1 Running 0 4m11s 10.44.0.1 node1 <none> <none>
[root@master ~]# curl 10.44.0.1
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h2>Welcome to nginx!</h2>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
感谢大家观看