centos7的kubernetes集羣搭建

 

基於kubeadm搭建Kubernetes集羣

1 所有節點需要配置的操作

1.1 關閉防火牆

# systemctl stop firewalld
# systemctl disable firewalld

1.2 關閉selinux

# sed -i 's/enforcing/disabled/' /etc/selinux/config

1.3 禁用swap

# swapoff -a
# vim /etc/fstab
		# 將與swap有關的配置註釋，重啓系統即可

1.3 修改主機名和/etc/hosts文件

# hostnamectl set-hostname {k8s-m|k8s-node1|k8s-node2}
# vim /etc/hosts
10.120.10.190   k8s-m
10.120.10.191   k8s-node1
10.120.10.192   k8s-node2
10.120.10.193   k8s-node3

1.4 重啓主機

# reboot

1.5 開啓路由轉發

# echo "net.ipv4.ip_forward = 1">>/etc/sysctl.conf
# sysctl -p

1.6 設置倉庫爲阿里雲倉庫

# cd /etc/yum.repos.d/
# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup #備份原文件
# wget -O /etc/yum.repos.d/CentOS-Base.repo  http://mirrors.aliyun.com/repo/Centos-7.repo

# yum clean all
# yum makecache
# yum install -y epel-release

1.7 配置Docker的阿里雲yum安裝源，並安裝

# cd /etc/yum.repos.d/
# wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# yum clean all
# yum makecache

1.8 在每個節點上安裝docker-ce-18.06.0並設置開機自啓動

# yum install docker-ce-18.06.2.ce
# docker -v
# systemctl start docker
# systemctl enable docker
# systemctl status docker

1.9 啓用bridge-nf-call-iptables和bridge-nf-call-ip6tables

# echo 'net.bridge.bridge-nf-call-iptables = 1'>>/etc/sysctl.conf
# echo 'net.bridge.bridge-nf-call-ip6tables = 1'>>/etc/sysctl.conf
# sysctl -p

1.10 配置kubernetes的阿里雲apt安裝源

# vim /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
# yum clean all
# yum makecache

1.11 在每個節點上安裝kubeadm，kubelet，kubectl並設置kubelet開機自啓動

# yum install kubelet-1.12.1-0 kubeadm-1.12.1-0 kubectl-1.12.1-0
# kubeadm version
# systemctl enable kubelet

2 Master節點：

2.1 導入kube-apiserver,kube-proxy等kubernetes1.12.1版本的docker鏡像

docker pull registry.aliyuncs.com/google_containers/coredns:1.2.2
docker tag be0e8485fd78 k8s.gcr.io/coredns:1.2.2
docker pull registry.aliyuncs.com/google_containers/etcd:3.2.24
 docker tag dcf9f4b0065d k8s.gcr.io/etcd:3.2.24
docker pull registry.aliyuncs.com/google_containers/pause:3.1
docker tag 97bc1dcec76a k8s.gcr.io/pause:3.1
docker pull registry.aliyuncs.com/google_containers/kube-apiserver:v1.12.1
docker tag dcb029b5e3ad k8s.gcr.io/kube-apiserver:v1.12.1
docker pull registry.aliyuncs.com/google_containers/kube-controller-manager:v1.12.1
docker tag aa2dd57c7329 k8s.gcr.io/kube-controller-manager:v1.12.1
docker pull registry.aliyuncs.com/google_containers/kube-proxy:v1.12.1
docker tag 68987659c19a k8s.gcr.io/kube-proxy:v1.12.1
docker pull registry.aliyuncs.com/google_containers/kube-scheduler:v1.12.1
docker tag af194c06e677 k8s.gcr.io/kube-scheduler:v1.12.1
docker pull quay-mirror.qiniu.com/coreos/flannel:v0.10.0-amd64
docker tag f0fad859c909 quay.io/coreos/flannel:v0.10.0-amd64

2.2 初始化master

# kubeadm init --kubernetes-version=1.12.1 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=10.120.10.190

## 上述步驟運行成功後，會輸出以下內容：
Your Kubernetes master 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/

You can now join any number of machines by running the following on each node
as root:

  kubeadm join 10.120.10.190:6443 --token d4557c.fh4vjxkiyoj2zt5y --discovery-token-ca-cert-hash sha256:b17d4618ab1149934f69582c727f58e53cd51f89dd9844fd3f7b776a0e3d389a

2.3 Master節點配置root用戶管理集羣：

2.3.1 使用root用戶運行kubernetes

# mkdir -p $HOME/.kube
# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

2.3.2 下載flannel文件 下載路徑https://download.csdn.net/download/twjjava/12458299

安裝flannel

kubectl apply -f kube-flannel.yml

 

2.3.3 查看集羣狀態

# kubectl get nodes

3 Node節點：

3.1 導入kube-proxy,pause和flannel，kubernetes1.12.1版本的docker鏡像

## 鏡像請從共享服務器下載：(\\10.120.1.100\安裝軟件\Kubernetes-1.12.1\kubernetes-1.12.1鏡像\ "安裝集羣所需鏡像")
docker pull registry.aliyuncs.com/google_containers/kube-proxy:v1.12.1
docker pull registry.aliyuncs.com/google_containers/pause:3.1
docker pull quay-mirror.qiniu.com/coreos/flannel:v0.10.0-amd64
kubeadm init --kubernetes-version=1.12.1 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.192.128

3.1 加入master節點：

kubeadm join 10.120.10.190:6443 --token s5gi75.o950l49ripas5e0y --discovery-token-ca-cert-hash sha256:b17d4618ab1149934f69582c727f58e53cd51f89dd9844fd3f7b776a0e3d389a

3.1 在Master上查看集羣狀態

# kubectl get nodes