CentOS7安装单节点k8s

环境

• 本次安装使用, CPU: 1核, 内存: 2G, 系统: CentOS7.6
• 建议至少cpu: 2核 ,内存: 2G，非硬性要求，1核1G也可以搭建起集群

1. 安装并运行docker
2. 关闭swap swapoff -a
3. 把hostname的解析添加到hosts中
4. 添加k8s yum软件源

# vi /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

5. 安装 kubeadm, kubelet 和 kubectl

yum install -y kubelet kubernetes-cni kubeadm

6. 配置kubeadm的yaml文件

# vi kubeadm.yaml
apiVersion: kubeadm.k8s.io/v1beta1
kind: ClusterConfiguration
kubernetesVersion: "v1.16.2"
imageRepository: "registry.aliyuncs.com/google_containers"
networking:
  podSubnet: "10.244.0.0/16"

7. 拉取镜像

kubeadm --config kubeadm.yaml config images pull

8. 转换镜像的tag,根据自己下载的版本转换

docker tag registry.aliyuncs.com/google_containers/kube-proxy:v1.16.2 k8s.gcr.io/kube-proxy:v1.16.2
docker tag registry.aliyuncs.com/google_containers/kube-scheduler:v1.16.2 k8s.gcr.io/kube-scheduler:v1.16.2
docker tag registry.aliyuncs.com/google_containers/kube-apiserver:v1.16.2 k8s.gcr.io/kube-apiserver:v1.16.2
docker tag registry.aliyuncs.com/google_containers/kube-controller-manager:v1.16.2 k8s.gcr.io/kube-controller-manager:v1.16.2
docker tag registry.aliyuncs.com/google_containers/etcd:3.3.15-0 k8s.gcr.io/etcd:3.3.15-0
docker tag registry.aliyuncs.com/google_containers/coredns:1.6.2 k8s.gcr.io/coredns:1.6.2
docker tag registry.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1

9. kubeadm初始化

kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=NumCPU 
# --ignore-preflight-errors=NumCPU 忽略cpu错误,如果cpu核心数足够,可以不加.
# 必须要带上--pod-network-cidr=10.244.0.0/16，不然设置网络的时候会报错

# 如果初始化出错或者想重新初始化，可以使用如下命令
kubeadm reset

# 出现 Your Kubernetes master has initialized successfully!,安装成功
# 安装成功后执行
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# 现在执行 kubectl get node,status为NotReady,是因为还没有网络插件

10. 安装网络

kubectl apply -f https://github.com/coreos/flannel/raw/master/Documentation/kube-flannel.yml

11. 安装Ingress

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/cloud-generic.yaml

#如果拥有公网ip,需要配置外网访问,请下载mandatory.yaml,添加, hostNetwork: true,位置如下:
apiVersion: apps/v1
kind: Deployment
spec:
  template:
    spec:
      hostNetwork: true #在此处添加

12. 设置mater节点为可调度,因为默认情况下K8s的master节点是不能运行Pod

kubectl taint nodes --all node-role.kubernetes.io/master-