linux安装k8s

1. systemctl stop firewalld  临时关闭防火墙
   systemctl disable firewalld   禁止开机启动防火墙

2. 防火墙问题：linu解决防火墙问题_小贞-10086的博客-CSDN博客

1. sed -i 's/enforcing/disabled/' /etc/selinux/config

1. [root@k8s-master ~]# swapoff -a  禁掉所有交换分区
   [root@k8s-master ~]# vim /etc/fstab  注释掉，不然重启swap分区又会被激活

1. cat >> /etc/hosts << EOF
   192.168.87.128 k8s-master
   192.168.87.127 k8s-node1
   192.168.87.126 k8s-node2
   EOF

1. cat > /etc/sysctl.d/k8s.conf << EOF
   net.bridge.bridge-nf-call-ip6tables = 1net.bridge.bridge-nf-call-iptables = 1
   EOF
    
    
   sysctl --system # 生效

1. yum install ntpdate -y
    
   ntpdate time.windows.com

1. wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
    
   yum -y install docker-ce-18.06.1.ce-3.el7
    
   systemctl enable docker && systemctl start docker
    
   docker --version

   cat > /etc/docker/daemon.json << EOF
   {
   "registry-mirrors": ["https://30nyszb4.mirror.aliyuncs.com"],
   "exec-opts": ["native.cgroupdriver=systemd"], 将cgroups改成systemd机制
   "log-driver": "json-file",
   "log-opts": {
       "max-size": "100m"
    },
   "storage-driver": "overlay2"
   }
   EOF
   
   systemctl restart docker  重启docker服务
   docker info  查看配置

1. cat > /etc/yum.repos.d/kubernetes.repo << EOF
   [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.gpg
   EOF

1. yum install -y kubelet-1.17.3 kubectl-1.17.3 kubeadm-1.17.3 (指定兼容的版本---依据你的docker版本来配置，若安装Rancher，则依据Rancher版本来配置)
    
   systemctl enable kubelet

1. kubeadm init 
   --apiserver-advertise-address=自己master节点的ip 
   --image-repository registry.aliyuncs.com/google_containers 
   --kubernetes-version v1.17.3(自己想要安装的版本,必须和上面安装的kubectl版本是一致的) 
   --service-cidr=10.96.0.0/12 
   --pod-network-cidr=10.244.0.0/16
   
   
   
   
   如果初始化话失败，则
   kubectl reset  重置kubectl
   
   找到失败原因后，再初始化

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

1. kubectl get nodes   查看是否启动
   
   如果报The connection to the server localhost:8080 was refused - did you specify the right host or port?
   
   则配置环境变量
   
   export KUBECONFIG=/etc/kubernetes/kubelet.conf

安装pod网络插件

1. kubectl apply -f https://warehouse-lxf.gitee.io/develop/config/kube-flannel.yml
   或者
   kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
   
   如果不行，就
   
   wget kube-flannel.yml
   
   再
   
   kubectl apply -f kube-flannel.yml

执行以下指令，加入集群

kubeadm join 192.168.87.128:6443 --token pbcvxr.jmkts88d2v2jmdj2     --discovery-token-ca-cert-hash sha256:9fc32c0acd3c7fd220b200380da2aef356cd0095750cecc6f2ab38507f2cd4f2

初始化主(master)节点时返回的kubeadm join 192.168.87.128:6443 --token ...

如果忘记复制保存，则在master主节点中执行：

kubeadm token create --print-join-command

查看加入集群的指令

1.  kubectl create deployment nginx --image=nginx
    kubectl expose deployment nginx --port=80 --type=NodePort
    kubectl get pod,svc

kubectl top node

如果报错：
Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)

问题分析：
Heapster是容器集群监控和性能分析工具，HPA、Dashborad、Kubectl top都依赖于heapster收集的数据。
但是Heapster从kubernetes 1.8以后已经被遗弃了… 被metrics-server所替代…那么就部署一下Heapster吧

解决问题，执行：
kubectl apply -f https://warehouse-lxf.gitee.io/develop/config/heapster-clusterrole.yaml
kubectl apply -f https://warehouse-lxf.gitee.io/develop/config/heapster.yaml