如何正确配置入口缓存使其工作?

Question

我正在尝试为特定主机配置缓存，但得到404。另外，我的配置似乎没有包含在最终的nginx.conf中。这个文件不包含它

我ingress.yaml:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: images-ingress
labels:
last_updated: "14940999355"
annotations:
kubernetes.io/ingress.class: "nginx"
cert-manager.io/cluster-issuer: "letsencrypt-prod"
nginx.ingress.kubernetes.io/rewrite-target: /
nginx.ingress.kubernetes.io/proxy-body-size: 8m
nginx.ingress.kubernetes.io/proxy-buffering: "on"
nginx.ingress.kubernetes.io/server-snippet: |
proxy_cache static-cache;
proxy_cache_valid 404 10m;
proxy_cache_use_stale error timeout updating http_404 http_500 http_502 http_503 http_504;
proxy_cache_bypass $http_x_purge;
add_header X-Cache-Status $upstream_cache_status;
spec:
tls:
- hosts:
- static.qwstrs.com
secretName: letsencrypt-prod
rules:
- host: static.qwstrs.com
http:
paths:
- path: /
backend:
serviceName: imaginary
servicePort: 9000

如果我删除这个样本

nginx.ingress.kubernetes.io/server-snippet: |
proxy_cache static-cache;
proxy_cache_valid 404 10m;
proxy_cache_use_stale error timeout updating http_404 http_500 http_502 http_503 http_504;
proxy_cache_bypass $http_x_purge;
add_header X-Cache-Status $upstream_cache_status;

一切正常，但没有缓存

即使我从上面的代码片段中有一行，它也会产生404错误并且不能工作

nginx.ingress.kubernetes.io/server-snippet: |
proxy_cache static-cache;

Answer 1

要启用缓存，需要配置nginx-ingress-controller的proxy_cache_path
可以通过修改nginx-ingress-controller的ConfigMap来实现。

---

我已经创建了一个例子来说明它是如何工作的(我假设你有kubernetes/ingress-nginx)。

首先，创建一个名为ingress-nginx-controller的ConfigMap，如文档custom_configuration:
所述:您可能需要修改proxy_cache_path设置，但是共享内存区域(keys_zone=static-cache))应该与你的proxy_cache指令相同。

$ cat configmap.yml
# configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: ingress-nginx-controller
namespace: default
data:
http-snippet: "proxy_cache_path /tmp/nginx_cache levels=1:2 keys_zone=static-cache:10m max_size=10g  inactive=60m use_temp_path=off;"

$ kubectl apply -f configmap.yml 
configmap/ingress-nginx-controller configured

然后创建Ingress资源(我已经修改了您的入口资源，以演示X-Cache-Status头如何工作):

$ cat ingress.yml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: images-ingress
annotations:
kubernetes.io/ingress.class: "nginx"
nginx.ingress.kubernetes.io/rewrite-target: /
nginx.ingress.kubernetes.io/proxy-body-size: 8m
nginx.ingress.kubernetes.io/proxy-buffering: "on"
nginx.ingress.kubernetes.io/configuration-snippet: |
proxy_cache static-cache;
proxy_cache_valid any 60m;
add_header X-Cache-Status $upstream_cache_status;
spec:
tls:
- hosts:
- static.qwstrs.com
secretName: letsencrypt-prod
rules:
- host: static.qwstrs.com
http:
paths:
- path: /
backend:
serviceName: imaginary
servicePort: 9000

$ kubectl apply -f ingress.yml
ingress.extensions/images-ingress configured

最后我们可以检查:

$ curl -k -I https://static.qwstrs.com
HTTP/2 200
...
x-cache-status: MISS
accept-ranges: bytes
$ curl -k -I https://static.qwstrs.com
HTTP/2 200
...
x-cache-status: HIT
accept-ranges: bytes

proxy_cache_path和proxy_cache的更多信息可以在这里找到。