k8s部署ingress
零、nginx-dep
#ngx-dep kubectl create deploy ngx-dep --image=nginx:alpine --dry-run=client -o yaml
最终的配置文件
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: ngx-dep
name: ngx-dep
spec:
replicas: 2
selector:
matchLabels:
app: ngx-dep
template:
metadata:
labels:
app: ngx-dep
spec:
volumes:
- name: ngx-conf-vol
configMap:
name: ngx-conf
containers:
- image: nginx:alpine
name: nginx
ports:
- containerPort: 80
volumeMounts:
- mountPath: /etc/nginx/conf.d
name: ngx-conf-vol
可以手动扩容
#扩容 kubectl scale --replicas=3 deploy ngx-dep` #给deployment创建service kubectl expose deploy ngx-dep --port=80 --target-port=80 --dry-run=client -o yaml
最终配置文件ngx-svc.yaml
apiVersion: v1
kind: Service
metadata:
labels:
app: ngx-dep
name: ngx-svc
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: ngx-dep
定义一个configmap
apiVersion: v1
kind: ConfigMap
metadata:
name: ngx-conf
data:
default.conf: |
server {
listen 80;
location / {
default_type text/plain;
return 200
'srv : $server_addr:$server_port\nhost: $hostname\nuri : $request_method $host $request_uri\ndate: $time_iso8601\n';
}
}
进入pod，查看负载均衡效果
#因为 Service、 Pod 的 IP 地址都是 Kubernetes 集群的内部网段，所以我们需要用 kubectl exec 进入到 Pod 内部（或者 ssh 登录集群节点），再用 curl 等工具来访问 Service： kubectl exec -it ngx-dep-6796688696-fm9fj -- sh curl svc_host:80,查看打印的内容
Service 的 IP 地址是“虚”的，只用于转发流量，所以 ping 无法得到回应数据包，也就失败了
可以给svc添加type=NodePort属性，就可以再集群外访问service了
一、ingress
kubectl create ing ngx-ing --rule="ngx.test/=ngx-svc:80" --class=ngx-ink --dry-run=client -o yaml
配置文件
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: ngx-ing
spec:
ingressClassName: ngx-ink
rules:
- host: ngx.test
http:
paths:
- backend:
service:
name: ngx-svc
port:
number: 80
path: /
pathType: Exact
二、ingressClass
apiVersion: networking.k8s.io/v1 kind: IngressClass metadata: name: ngx-ink spec: controller: nginx.org/ingress-controller
此时ingressClass、ingress、service的映射关系
NGINX-controller的配置文件https://github.com/chronolaw/k8s_study/tree/master/ingress
如果只是测试只需要四个文件
kubectl apply -f common/ns-and-sa.yaml kubectl apply -f rbac/rbac.yaml kubectl apply -f common/nginx-config.yaml kubectl apply -f common/default-server-secret.yaml
下面实现ingress-controller，它实际也是一个应用
apiVersion: apps/v1
kind: Deployment
metadata:
name: ngx-kic-dep
namespace: nginx-ingress
spec:
replicas: 1
selector:
matchLabels:
app: ngx-kic-dep
template:
metadata:
labels:
app: ngx-kic-dep
spec:
containers:
- image: nginx/nginx-ingress:2.2-alpine
name: nginx
args:
- -ingress-class=ngx-ink
这个deploy是在新的namespace：nginx-ingress下面，查看命令如下
kubectl get po -n nginx-ingress kubectl get deploy-n nginx-ingress
最终的映射关系
