K8S kubeadm方式部属记录

备注

开机自启
systemctl enable kubelet docker

零前期准备

1.关闭firewall && 安装且关闭 iptables

systemctl disable firewalld

yum install iptables-services

systemctl disable iptables

3 主节点和nodes 互信配置hosts

修改主机名 sysctl hostname-set master

cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.31.201 master
192.168.31.202 node1
192.168.31.203 node2

生成密钥互信

ssh-keygen

ssh-copy-id -i ~/.ssh/id-rsa.pub root@node1

一 yum安装

0.master nodes都安装下面几个

yum install docker-ce kubelet kubeadm kubectl

1.镜像源配置

阿里云

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

vim kubernetes.repo

[kubernetes]

name=Kubernetes Repo

baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/

gpgcheck=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg

enable=1

2.gpg导入

wget https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

rpm --import xxxx

二通过kubeadm工具安装

0.修改配置文件忽略Swap错误

vim /etc/sysconfig/kubelet #默认是空（KUBELET_EXTRA_ARGS=）

KUBELET_EXTRA_ARGS="--fail-swap-on=false"

执行下面发现镜像下载失败

kubeadm init --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap

1.docker初始化配置 &&配置代理下载 k8s.gcr.io 镜像（或者手动下载）

修改存储目录新建 /etc/docker/daemon.json

{

"graph":"/data/docker/"

}

systemctl daemon-reload

systemctl start docker

2 执行报错镜像无法下载 === 手动下载再修改名称

通过阿里云docker可以绑定github使用国外机器打包

Dockfile 内容如下一共处理了7个镜像（参考https://blog.csdn.net/sjyu_ustc/article/details/79990858）

FROM k8s.gcr.io/kube-apiserver:v1.15.3
MAINTAINER shaoyun

三解决了上面的问题之后开始安装

master执行成功

kubeadm init --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap

然后会提示

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 192.168.31.201:6443 --token iv8o1u.pb9jqkqalec4p3v1 \
    --discovery-token-ca-cert-hash sha256:f0f5a32712ef847c13278d49016b5f24f0b7d768cd115608307a83d3878ca82d

kubeadm join 192.168.31.201:6443 --token iv8o1u.pb9jqkqalec4p3v1     --discovery-token-ca-cert-hash sha256:f0f5a32712ef847c13278d49016b5f24f0b7d768cd115608307a83d3878ca82d --ignore-preflight-errors=Swap

问题 
The connection to the server localhost:8080 was refused - did you specify the right host or port?

 出现这个问题的原因是kubectl命令需要使用kubernetes-admin来运行，解决方法如下，将主节点中的【/etc/kubernetes/admin.conf】文件拷贝到从节点相同目录下，然后配置环境变量：

echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile
source source ~/.bash_profile

状态为 NotReady  需要主节点安装网络插件 flannel
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
quay.io/coreos/alannel:v0.11.0-amd64

Node节点安装：

复制出这句话到node节点执行即可（node一样安装 docker kubelet kubeadm和配置）

/etc/docker/daemon.json

{