我正在测试 gke 入口以将流量路由到两个不同的服务。我的部署由一个基本的 Web 容器组成，它部署了一个蓝色网页默认值和一个绿色网页。我能够得到回复基本上“/”适用于蓝色或绿色部署。但是当我访问 http:///green 时，我收到了 404 响应。我已经用“/”作为绿色部署进行了相同的测试，它显示了一个绿色的网页。但是，如果我访问 http:///blue 会导致 404 响应，
我已通过将负载平衡器直接连接到容器来验证我的容器是否正常工作。我正在关注如何指导 gke 设置类似的环境。 GKE Ingress How to guide
关于我所缺少的任何帮助将极大地帮助我更好地了解正在发生的事情以及为什么我的 gke 负载均衡器无法路由流量。
绿色部署文件
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-green
spec:
replicas: 2
selector:
matchLabels:
app: myapp
version: green
template:
metadata:
name: myapp
labels:
app: myapp
version: green
spec:
containers:
- name: myapp
image: gcr.io/ultra-welder-300122/myapp:green
imagePullPolicy: Always
resources:
requests:
cpu: "100m"
memory: "100Mi"
ports:
- containerPort: 8080
蓝色部署文件
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-blue
spec:
replicas: 2
selector:
matchLabels:
app: myapp
version: blue
template:
metadata:
name: myapp
labels:
app: myapp
version: blue
spec:
containers:
- name: myapp
image: gcr.io/ultra-welder-300122/myapp:blue
imagePullPolicy: Always
resources:
requests:
cpu: "100m"
memory: "100Mi"
ports:
- containerPort: 8888
我的服务 yaml
apiVersion: v1
kind: Service
metadata:
name: myapp-blue-service
labels:
app: myapp
version: blue
spec:
type: NodePort
selector:
app: myapp
version: blue
ports:
- protocol: TCP
port: 80
targetPort: 8888
---
apiVersion: v1
kind: Service
metadata:
name: myapp-green-service
labels:
app: myapp
version: green
spec:
type: NodePort
selector:
app: myapp
version: green
ports:
- protocol: TCP
port: 80
targetPort: 8080
Gke 入口 yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: myapp-ingress
annotations:
# If the class annotation is not specified it defaults to "gce".
kubernetes.io/ingress.class: "gce"
spec:
rules:
- http:
paths:
- path: /*
backend:
serviceName: myapp-blue-service
servicePort: 80
- path: /green
backend:
serviceName: myapp-green-service
servicePort: 80
服务状态
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.42.0.1 <none> 443/TCP 6h18m
myapp-blue-service NodePort 10.42.81.106 <none> 80:31664/TCP 4h35m
myapp-green-service NodePort 10.42.74.168 <none> 80:30246/TCP 4h35m
入口状态
kubectl describe ing myapp-ingress
Name: myapp-ingress
Namespace: default
Address: 34.95.121.24
Default backend: default-http-backend:80 (10.41.0.9:8080)
Rules:
Host Path Backends
---- ---- --------
*
/* myapp-blue-service:80 (10.41.0.24:8888,10.41.1.16:8888)
/green myapp-green-service:80 (10.41.0.27:8080,10.41.1.19:8080)
Annotations: ingress.kubernetes.io/backends:
{"k8s-be-30192--a4913825f2ae16d4":"HEALTHY","k8s-be-30246--a4913825f2ae16d4":"HEALTHY","k8s-be-31664--a4913825f2ae16d4":"HEALTHY"}
ingress.kubernetes.io/forwarding-rule: k8s2-fr-dkti1gqp-default-myapp-ingress-yd16xk65
ingress.kubernetes.io/target-proxy: k8s2-tp-dkti1gqp-default-myapp-ingress-yd16xk65
ingress.kubernetes.io/url-map: k8s2-um-dkti1gqp-default-myapp-ingress-yd16xk65
kubernetes.io/ingress.class: gce
部署和 Pod 状态
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/myapp-blue 2/2 2 2 4h18m
deployment.apps/myapp-green 2/2 2 2 38m
NAME READY STATUS RESTARTS AGE
pod/myapp-blue-9c9cbf5b-c7v7c 1/1 Running 0 4h18m
pod/myapp-blue-9c9cbf5b-cpvgl 1/1 Running 0 4h18m
pod/myapp-green-7f56cc9496-hnfkz 1/1 Running 0 38m
pod/myapp-green-7f56cc9496-v8bb6 1/1 Running 0 38m
服务状态
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.42.0.1 <none> 443/TCP 6h24m
myapp-blue-service NodePort 10.42.81.106 <none> 80:31664/TCP 4h40m
myapp-green-service NodePort 10.42.74.168 <none> 80:30246/TCP 4h40m
答案 0 :(得分：1)
我发现问题出在 gke 入口控制器上。 Gke 入口控制器不提供 / 的重写目标。我正在从 webroot 提供我的绿色和蓝色网页。 GKE 入口控制器正在将请求的 URL http://34.95.121.24/green 转发到 http://{backend }/绿色。 http://{backend 上没有托管页面 }/green 因为我的默认页面托管在 http://{backend}/ 上。
这个问题有两种解决方案。
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: myapp-ingress
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /
spec:
rules:
- http:
paths:
- path: /*
backend:
serviceName: myapp-blue-service
servicePort: 80
- path: /green
backend:
serviceName: myapp-green-service
servicePort: 80
我创建了一个默认的服务器配置部分，将任何到达 /green 的流量路由到 index.html。
server {
listen 80 default_server;
listen [::]:80 default_server;
root /var/www/html;
server_name _;
location / {
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
index index.html
try_files $uri $uri/ =404;
}
location /green {
try_files $uri $uri/ /index.html;
}
我将默认站点配置复制到我的 docker 配置文件中的 /etc/nginx/sites-avaiable。
我的示例 Dockerfile
FROM ubuntu
RUN apt-get update
RUN apt-get install nginx -y
COPY index.html /var/www/html/
COPY default /etc/nginx/sites-available/
EXPOSE 80
CMD ["nginx","-g","daemon off;"]