k8s中MetalLB的使用
汝繁
1.官方链接
https://metallb.universe.tf/concepts/
操作步骤
step 1 安装MetalLB
kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.12.1/manifests/namespace.yaml
kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.12.1/manifests/metallb.yaml
step 2 配置config, 以layer2协议为例
config.yaml的内容如下：
apiVersion: v1
kind: ConfigMap
metadata:
namespace: metallb-system
name: config
data:
config: |
address-pools:
- name: dev-public-ips
protocol: layer2
addresses:
- 10.0.2.100-10.0.2.200
其中，dev-public-ips为自定义名称，后面会用到， addresses为自定义地址池
step 3 以nginx为例
(1) Deployment
nginx-deployment.yaml 的内容如下
root@unode1:~/metallb/example# cat nginx-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: pc-deployment
namespace: dev
spec:
replicas: 3
selector:
matchLabels:
app: nginx-pod
template:
metadata:
labels:
app: nginx-pod
spec:
containers:
- name: nginx
image: nginx:1.17.1
ports:
- containerPort: 80
应用Deployment该文件
kubectl apply -f nginx-deployment.yaml
(2) Service
root@unode1:~/metallb/example# cat service-metallb.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx
namespace: dev
annotations:
metallb.universe.tf/address-pool: dev-public-ips #注意，dev-public-ips为config.yaml地址池的名称
spec:
ports:
- port: 81 #external ip的端口
targetPort: 80 # 内部容器端口
selector:
app: nginx-pod
type: LoadBalancer
应用Service文件
kubectl apply -f service-metallb.yaml
(3)参看Service
root@unode1:~/metallb/example# kubectl get svc -n dev
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx LoadBalancer 10.109.79.140 10.0.2.101 81:30182/TCP 14h
其中81为EXTERNAL-IP的端口， 30182为node端口， 访问测试如下：
测试1
root@unode1:~/metallb/example# curl 10.0.2.101:81
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
测试2
root@unode1:~/metallb/example# curl 10.0.2.4:30182 #10.0.2.4为node的ip
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
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