一.k8s部署1.各节点安装kubectl,kubelet,kubeadm,需要通过yum安装，所以还是先配置yum源。
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cat /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg2.安装k8s要注意版本匹配，不然会在初始化的时候提示你kubeadm版本和kubernets版本不对，或高或低，所以安装完成后查看下版本，最好yum安装时带版本号安装
kubeadm version
kubectl version
输出如下：
[root@localhost kubernetes]# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.1", GitCommit:"eec55b9ba98609a46fee712359c7b5b365bdd920", GitTreeState:"clean", BuildDate:"2018-12-13T10:36:44Z", GoVersion:"go1.11.2", Compiler:"gc", Platform:"linux/amd64"}开机启动，初始化要保证开启systemctl enable kubelet.service
开始安装，镜像下载网上有很多不多说，现在完成后改名为如下：
k8s.gcr.io/kube-proxy v1.13.1 fdb321fd30a0 7 months ago 80.2MB
k8s.gcr.io/kube-scheduler v1.13.1 ab81d7360408 7 months ago 79.6MB
k8s.gcr.io/kube-apiserver v1.13.1 40a63db91ef8 7 months ago 181MB
k8s.gcr.io/kube-controller-manager v1.13.1 26e6f1db2a52 7 months ago 146MB
k8s.gcr.io/coreDNS 1.2.6 f59dcacceff4 9 months ago 40MB
k8s.gcr.io/etcd 3.2.24 3cab8e1b9802 10 months ago 220MB
k8s.gcr.io/pause 3.1 da86e6ba6ca1 19 months ago 742kB然后master节点执行初始化kubeadm init --kubernetes-version=v1.15.0 --pod-network-cidr=10.244.0.0/16
注意版本要匹配自己的版本，后面pod网段要匹配fannel插件安装时候的yaml.
初始化完成会显示以下内容：这里的东西很重要，颜色表明的要按自己的去复制
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 172.16.32.10:6443 --token x8gdiq.sbcj8g4fmoocd5tl \
--discovery-token-ca-cert-hash sha256:0b48e70fa8a268f8b88cd69b02cf87d8a2bf2efe519bb88dfa558de20d4a9993安装网络插件fannelkubectl apply -f https://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml
*也是要注意版本问题，kube-fannel.yaml里面是有镜像版本配置的，同时注意修改里面的网段和初始化一致。全部running状态。
[root@localhost kubernetes]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-86c58d9df4-jt4pd 1/1 Running 0 25h
coredns-86c58d9df4-m6bzt 1/1 Running 0 25h
etcd-localhost.localdomain 1/1 Running 0 25h
kube-apiserver-localhost.localdomain 1/1 Running 0 25h
kube-controller-manager-localhost.localdomain 1/1 Running 0 25h
kube-flannel-ds-amd64-qfqr4 1/1 Running 20 24h
kube-flannel-ds-amd64-xjk6v 1/1 Running 0 25h
kube-proxy-p226l 1/1 Running 0 24h
kube-proxy-qq4j4 1/1 Running 0 25h
kube-scheduler-localhost.localdomain 1/1 Running 0 25h
kubernetes-dashboard-7d77666777-2l68j 1/1 Running 0 5h38m从节点加入：
从节点需要安装kube-proxy pause
使用master初始化时候结果的kubeadm join来加入主节点kubeadm join 172.16.32.10:6443 --token x8gdiq.sbcj8g4fmoocd5tl \
--discovery-token-ca-cert-hash sha256:0b48e70fa8a268f8b88cd69b02cf87d8a2bf2efe519bb88dfa558de20d4a9993从节点加完后记得从主节点拷贝admin.yaml
