centos安装kubernetes

主要内容

---

• centos在线安装kubernetes(单master)
• 自动判断是否国内，防止速度过慢

前提条件

---

• 安装docker-ce 18.09.9（所有机器）
• 安装calico（master）

kubernetes安装

所有节点

curl --connect-timeout 1 http://youtube.com/favicon.ico &>/dev/null
if [ $? = 0 ];then
	cat <<EOF > /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
EOF
else
	cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
fi

# 查看最新的版本
yum list kubectl --showduplicates | sort -r

# 安装kubeadm、kubectl、kubelet
yum install -y kubectl-1.16.5-0 kubeadm-1.16.5-0 kubelet-1.16.5-0

# 双重保险关闭swap
cat <<EOF > /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS=--fail-swap-on=false
EOF

# 启动kubelet服务
systemctl enable kubelet && systemctl start kubelet

master

$ cat > kubeadm-config.yaml << EOF

apiVersion: kubeadm.k8s.io/v1beta2
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 10.19.4.6
  bindPort: 6443
nodeRegistration:
  taints:
  - effect: PreferNoSchedule
    key: node-role.kubernetes.io/master
---
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
imageRepository: registry.aliyuncs.com/google_containers
kubernetesVersion: v1.16.5
networking:
  podSubnet: 10.244.0.0/16
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs

EOF
kubeadm init\
    --image-repository registry.aliyuncs.com/google_containers \
    --kubernetes-version v1.16.5 \
    --pod-network-cidr=10.244.0.0/16 \
    --apiserver-advertise-address 10.19.4.6 \
    --ignore-preflight-errors=Swap \
    --token-ttl 0

# ...
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 10.19.4.6:6443 --token 2ujdtn.p0tvurpwquuso74p \
    --discovery-token-ca-cert-hash sha256:5369ffe1e7734b6f6fda5a3d71712b3f70ee9b5c4a2f3a90f5b06385e80e3321 

安装网络插件

• Flannel： Flannel 是基于 Overlay 网络模型的网络插件，能够方便部署，一般部署后只要不出问题，一般不需要管它。
• Calico： 与 Flannel 不同，Calico 是一个三层的数据中心网络方案，使用 BGP 路由协议在主机之间路由数据包，可以灵活配置网络策略。
  下载 Calico 部署文件，并替换里面的网络范围为上面 kubeadm 中 networking.podSubnet 配置的值。

#下载 calico 部署文件
$ wget https://docs.projectcalico.org/v3.10/getting-started/kubernetes/installation/hosted/kubernetes-datastore/calico-networking/1.7/calico.yaml 

#替换 calico 部署文件的 IP 为 kubeadm 中的 networking.podSubnet 参数 10.244.0.0。
$ sed -i 's/192.168.0.0/10.244.0.0/g' calico.yaml

#部署 Calico 插件
$ kubectl apply -f calico.yaml