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k8s

rke安装k8s集群

rke文档地址

1、环境准备

2、下载rke二进制文件

安装节点下载即可

curl -L https://github.com/rancher/rke/releases/download/v0.3.2/rke_linux-amd64 -o /usr/bin/rke
chmod +x /usr/bin/rke

3、关闭防火墙、selinux等

关闭所有主机的selinux、firewalld

setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
systemctl stop firewalld && systemctl disable firewalld

4、安装docker

所有节点

yum install -y epel-release
yum install -y yum-utils net-tools conntrack-tools wget
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum install -y docker-ce-18.06.1.ce

启动

systemctl start docker
systemctl enable docker

配置加速

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://jz73200c.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

5、初始化docker用户

所有节点

useradd -m docker && echo "1qaz@WSX" | passwd --stdin docker

6、安装节点配置互信

ssh-keygen -t rsa -b 2048 -N '' -f ~/.ssh/id_rsa

ssh-copy-id docker@节点地址

7、创建集群配置文件

cat > rancher-cluster.yml <<EOF
nodes:
  - address: 192.168.146.134
    internal_address: 192.168.146.134
    user: docker
    role: [controlplane,worker,etcd]
  - address: 192.168.146.135
    internal_address: 192.168.146.135
    user: docker
    role: [controlplane,worker,etcd]
  - address: 192.168.146.136
    internal_address: 192.168.146.136
    user: docker
    role: [controlplane,worker,etcd]

services:
  etcd:
    snapshot: true
    creation: 6h
    retention: 24h
EOF

8.下载镜像

可提前下载好所需镜像

docker pull rancher/rke-tools:v0.1.50
docker pull rancher/hyperkube:v1.15.5-rancher1
docker pull rancher/coreos-etcd:v3.3.10-rancher1

9、构建集群

rke up --config ./rancher-cluster.yml

10、查看结果

11、配置

主节点

mkdir ~/.kube
cat kube_config_rancher-cluster.yml > ~/.kube/config

12、安装kubectl等

cat > /etc/yum.repos.d/kubernetes.repo <<EOF
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

主机点安装Kubectl即可

yum -y install kubectl

安装自动补全

yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc

13、查看节点信息

kubectl get node

14、发布应用测试

cat >> nginx.yaml <<EOF
apiVersion: v1
kind: Service
metadata:
  labels:
    app: nginx-service
  name: nginx-service
  namespace: default
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx
  sessionAffinity: None
  type: ClusterIP
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 6
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.16.0
        ports:
        - containerPort: 80
EOF

创建

kubectl apply -f nginx.yaml

查看状态

kubectl get pod -o wide

查看svc，测试

kubectl get svc

删除

kubectl delete deploy --all
kubectl delete svc/nginx-service