Question

我正在遵循Istio文档（https://istio.io/docs/examples/advanced-egress/egress-gateway/）来设置出口网关。我得到的结果与文档描述的结果不同，我想知道如何解决它。

我有一个简单的docker容器，其中注入了sidecar。在为google.com应用类似于文档提供的网关配置之后：

cat <<EOF | kubectl apply -f -
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: google
spec:
  hosts:
  - google.com
  ports:
  - number: 80
    name: http-port
    protocol: HTTP
  - number: 443
    name: https
    protocol: HTTPS
  resolution: DNS
EOF

我仍然无法从容器中到达它：

$ kubectl exec -it $SOURCE_POD -c $CONTAINER_NAME -- curl -sL -o /dev/null -D - http://google.com
HTTP/1.1 301 Moved Permanently
location: http://www.google.com/
content-type: text/html; charset=UTF-8
... 

HTTP/1.1 404 Not Found
date: Thu, 18 Oct 2018 22:55:57 GMT
server: envoy
content-length: 0

但是，curl中的istio-proxy有效：

$ kubectl exec -it $SOURCE_POD -c istio-proxy -- curl -sL -o /dev/null -D - http://google.com
HTTP/1.1 301 Moved Permanently
Location: http://www.google.com/
Content-Type: text/html; charset=UTF-8
...

HTTP/1.1 200 OK
Date: Thu, 18 Oct 2018 22:55:43 GMT
Expires: -1
...

检查网关是否存在：

$ kubectl describe serviceentry/google
Name:         google
Namespace:    default
Labels:       <none>
Annotations:  kubectl.kubernetes.io/last-applied-configuration:
                {"apiVersion":"networking.istio.io/v1alpha3","kind":"ServiceEntry","metadata":{"annotations":{},"name":"google","namespace":"default"},"sp...
API Version:  networking.istio.io/v1alpha3
Kind:         ServiceEntry
Metadata:
  Cluster Name:
  Creation Timestamp:  2018-10-18T22:36:34Z
  Generation:          1
  Resource Version:    2569394
  Self Link:           /apis/networking.istio.io/v1alpha3/namespaces/default/serviceentries/google
  UID:                 4482d584-...
Spec:
  Hosts:
    google.com
  Ports:
    Name:      http-port
    Number:    80
    Protocol:  HTTP
    Name:      https
    Number:    443
    Protocol:  HTTPS
  Resolution:  DNS
Events:        <none>

有什么想法吗？

Answer 1

您的问题是curl请求将301重定向到www.google.com，但是您的ServiceEntry仅公开了google.com。您可以通过将www.google.com作为ServiceEntry中的另一个主机添加来解决此问题，如下所示：

cat <<EOF | kubectl apply -f -
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
  name: google
spec:
  hosts:
  - google.com
  - www.google.com
  ports:
  - number: 80
    name: http-port
    protocol: HTTP
  - number: 443
    name: https
    protocol: HTTPS
  resolution: DNS
EOF

Answer 2

如果您不想处理通配符，则可以添加通配符。使用HTTP即可。您可以尝试使用* .google.com之类的东西，现在您可以使用google的所有服务，而将来不会被阻止。

添加istio出口网关后，Pod无法卷曲外部网站

2 个答案: