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我有兩個映射到兩個服務並使用我的筆記本電腦上的虛擬框虛擬機運行的服務。我有kube dns工作。一個pod是一個web服務，另一個是mongodb。Kubernetes服務溝通isse - Kubedns
web應用莢的該規範是下面
spec:
containers:
- resources:
limits:
cpu: 0.5
.
.
name: wsemp
ports:
- containerPort: 8080
# name: wsemp
#command: ["java","-Dspring.data.mongodb.uri=mongodb://192.168.6.103:30061/microservices", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
command: ["java","-Dspring.data.mongodb.uri=mongodb://mongoservice/microservices", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
相應服務的規範
apiVersion: v1
kind: Service
metadata:
labels:
name: webappservice
name: webappservice
spec:
ports:
- port: 8080
nodePort: 30062
targetPort: 8080
protocol: TCP
type: NodePort
selector:
name: webapp
MongoDB的莢果規格
apiVersion: v1
kind: Pod
metadata:
name: mongodb
labels:
name: mongodb
spec:
containers:
.
.
name: mongodb
ports:
- containerPort: 27017
MongoDB的服務規範
apiVersion: v1
kind: Service
metadata:
labels:
name: mongodb
name: mongoservice
spec:
ports:
- port: 27017
nodePort: 30061
targetPort: 27017
protocol: TCP
type: NodePort
selector:
name: mongodb
在服務網點更新的目標端口後評論
問題
的web應用程序在啓動時不能夠與mongoservice端口連接，並給出了這個錯誤在啓動
Exception in monitor thread while connecting to server mongoservice:27017
com.mongodb.MongoSocketOpenException: Exception opening socket
at com.mongodb.connection.SocketStream.open(SocketStream.java:63) ~[mongodb-driver-core-3.2.2.jar!/:na]
at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:114) ~[mongodb-driver-core-3.2.2.jar!/:na]
at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:128) ~[mongodb-driver-core-3.2.2.jar!/:na]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.8.0_111]
描述SVC
kubectl describe svc mongoservice
Name: mongoservice
Namespace: default
Labels: name=mongodb
Selector: name=mongodb
Type: NodePort
IP: 10.254.146.189
Port: <unset> 27017/TCP
NodePort: <unset> 30061/TCP
Endpoints: 172.17.99.2:27017
Session Affinity: None
No events.
kubectl describe svc webappservice
Name: webappservice
Namespace: default
Labels: name=webappservice
Selector: name=webapp
Type: NodePort
IP: 10.254.112.121
Port: <unset> 8080/TCP
NodePort: <unset> 30062/TCP
Endpoints: 172.17.99.3:8080
Session Affinity: None
No events.
調試
[email protected]:/# nslookup mongoservice
Server: 10.254.0.2
Address: 10.254.0.2#53
Non-authoritative answer:
Name: mongoservice.default.svc.cluster.local
Address: 10.254.146.189
[email protected]:/# curl 10.254.146.189:27017
curl: (7) Failed to connect to 10.254.146.189 port 27017: Connection refused
[email protected]:/# curl mongoservice:27017
curl: (7) Failed to connect to mongoservice port 27017: Connection refused
sudo iptables-save | grep webapp
-A KUBE-NODEPORTS -p tcp -m comment --comment "default/webappservice:" -m tcp --dport 30062 -j KUBE-MARK-MASQ
-A KUBE-NODEPORTS -p tcp -m comment --comment "default/webappservice:" -m tcp --dport 30062 -j KUBE-SVC-NQBDRRKQULANV7O3
-A KUBE-SEP-IE7EBTQCN7T6HXC4 -s 172.17.99.3/32 -m comment --comment "default/webappservice:" -j KUBE-MARK-MASQ
-A KUBE-SEP-IE7EBTQCN7T6HXC4 -p tcp -m comment --comment "default/webappservice:" -m tcp -j DNAT --to-destination 172.17.99.3:8080
-A KUBE-SERVICES -d 10.254.217.24/32 -p tcp -m comment --comment "default/webappservice: cluster IP" -m tcp --dport 8080 -j KUBE-SVC-NQBDRRKQULANV7O3
-A KUBE-SVC-NQBDRRKQULANV7O3 -m comment --comment "default/webappservice:" -j KUBE-SEP-IE7EBTQCN7T6HXC4
$ curl 10.254.217.24:8080
{"timestamp":1486678423757,"status":404,"error":"Not Found","message":"No message available","path":"/"}[[email protected] ~]$
sudo iptables-save | grep mongodb
[[email protected] ~]$ sudo iptables-save | grep mongo
-A KUBE-NODEPORTS -p tcp -m comment --comment "default/mongoservice:" -m tcp --dport 30061 -j KUBE-MARK-MASQ
-A KUBE-NODEPORTS -p tcp -m comment --comment "default/mongoservice:" -m tcp --dport 30061 -j KUBE-SVC-2HQWGC3WSIBZF7CN
-A KUBE-SEP-FVWOWAWXXVAVIQ5O -s 172.17.99.2/32 -m comment --comment "default/mongoservice:" -j KUBE-MARK-MASQ
-A KUBE-SEP-FVWOWAWXXVAVIQ5O -p tcp -m comment --comment "default/mongoservice:" -m tcp -j DNAT --to-destination 172.17.99.2:27017
-A KUBE-SERVICES -d 10.254.146.189/32 -p tcp -m comment --comment "default/mongoservice: cluster IP" -m tcp --dport 27017 -j KUBE-SVC-2HQWGC3WSIBZF7CN
-A KUBE-SVC-2HQWGC3WSIBZF7CN -m comment --comment "default/mongoservice:" -j KUBE-SEP-FVWOWAWXXVAVIQ5O
[[email protected] ~]$ sudo curl 10.254.146.189:8080
^C[[email protected] ~]$ sudo curl 10.254.146.189:27017
It looks like you are trying to access MongoDB over HTTP on the native driver port.
[email protected]:/# netstat -an
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:27017 0.0.0.0:* LISTEN
tcp 0 0 172.17.99.2:60724 151.101.128.204:80 TIME_WAIT
tcp 0 0 172.17.99.2:60728 151.101.128.204:80 TIME_WAIT
MongoDB的容器具有在啓動時沒有錯誤。
試圖按照https://kubernetes.io/docs/user-guide/debugging-services/#iptables中的步驟操作，因爲我不知道該怎麼做，所以卡在「嘗試重新啓動kube-proxy並將-V標誌設置爲4」的部分。
我不是網絡人，所以不知道如何以及需要分析什麼。任何類型的調試提示都會有很大的幫助。
感謝。
在webappservice和mongoservice中對NodePorts進行了評論，並且嘗試過，因爲它與虛擬框vms中的內部網絡通信有關。端口： - 端口：27017 ＃nodePort：30061 targetPort：27017 protocol：TCP ＃type：NodePort。仍遇到相同的錯誤。 。 – Vikram