k8s 学习单机部署

k8S

部署

1.三台节点

master : 144
node1 :  145
node2 :  146

2.系统初始化

关闭防火墙

yum -y install wget
systemctl stop firewalld
systemctl disable firewalld

关闭 selinux

sed -i 's/enforcing/disabled/' /etc/selinux/config # 永久
setenforce 0 # 临时

关闭 swap：

#关闭 swap：
swapoff -a # 临时
vim /etc/fstab # 
cat /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="--fail-swap-on=false"

设置主机名 分别设置

hostnamectl set-hostname k8s-master  #master节点
hostnamectl set-hostname k8s-node1   #node节点
hostnamectl set-hostname k8s-node2   #node节点

在 master 添加 hosts

cat >> /etc/hosts << EOF 
192.168.92.138 k8s-master 
192.168.92.145 k8s-node1 
192.168.92.146 k8s-node2 
EOF

将桥接的 IPv4 流量传递到 iptables 的链：

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

时间同步

yum install ntpdate -y
ntpdate time.windows.com

3.安装

所有节点安装 Docker/kubeadm/kubelet

安装 Docker

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

设置仓库地址

cat > /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF

systemctl restart docker

添加 yum 源

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

安装kubeadm，kubelet和kubectl

#  (由于版本更新频繁，这里指定版本号部署)
yum install -y kubelet-1.18.0 kubeadm-1.18.0 kubectl-1.18.0
systemctl enable kubelet

部署Kubernetes Master(主节点执行)

#在192.168.92.144（Master）执行。 address:主机ip  repository:阿里云仓库 cidr:ip,不冲突就行,没有别的要求
#kubeadm reset
kubeadm init --apiserver-advertise-address=192.168.92.144 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.18.0 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16

使用kubectl工具：(主节点)

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

加入Kubernetes Node(丛节点进行)

#这一段是虚拟机上考下来的
kubeadm join 192.168.92.138:6443 --token if89zy.ijlfug0watesdieo \
    --discovery-token-ca-cert-hash sha256:9c41336a59cef683f2dffc99a94dd450793244bdb7f68a3eb25051e005fe519e

#重新创建token
kubeadm token create --print-join-command

部署CNI网络插件

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

#主节点执行
kubectl apply -f ./kube-flannel.yml
kubectl get pods -n kube-system

#设置节点role名称
kubectl label node k8s-node1 node-role.kubernetes.io/worker=worker
kubectl label node k8s-node2 node-role.kubernetes.io/worker=worker

#查看节点 
kubectl get nodes

测试kubernetes集群

#拉取镜像
kubectl create deployment nginx --image=nginx

#保楼端口
kubectl expose deployment nginx --port=80 --type=NodePort

#查看镜像是否running
kubectl get pod

#查看提供服务的端口
[root@k8s-master ~]# kubectl get pod,svc
NAME                        READY   STATUS    RESTARTS   AGE
pod/nginx-f89759699-4kqwg   1/1     Running   0          5m28s

NAME                 TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
service/kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP        29m
service/nginx        NodePort    10.106.160.166   <none>        80:30027/TCP   5m24s

#测试  访问node节点的ip+端口
http://192.168.92.146:30027