如果使用指向某些外部服务的externalName创建服务 .
apiVersion: v1
kind: Service
metadata:
name: test
spec:
type: ExternalName
externalName: google.com
当我现在尝试进行DNS查找时,它不会返回任何有用的内容:
# dig test.development.svc.cluster.local.
; <<>> DiG 9.9.5-9+deb8u15-Debian <<>> test.development.svc.cluster.local.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58159
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;test.development.svc.cluster.local. IN A
;; AUTHORITY SECTION:
cluster.local. 60 IN SOA ns.dns.cluster.local. hostmaster.cluster.local. 1524736800 28800 7200 604800 60
;; Query time: 0 msec
;; SERVER: 100.64.0.10#53(100.64.0.10)
;; WHEN: Thu Apr 26 10:58:48 UTC 2018
;; MSG SIZE rcvd: 106
如果我明确查询类型CNAME,我会得到一个回复:
# dig -t CNAME test.development.svc.cluster.local.
; <<>> DiG 9.9.5-9+deb8u15-Debian <<>> -t CNAME test.development.svc.cluster.local.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54517
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;test.development.svc.cluster.local. IN CNAME
;; ANSWER SECTION:
test.development.svc.cluster.local. 30 IN CNAME google.com.
;; Query time: 0 msec
;; SERVER: 100.64.0.10#53(100.64.0.10)
;; WHEN: Thu Apr 26 10:59:55 UTC 2018
;; MSG SIZE rcvd: 76
如果我将服务更改为指向其他一些集群内部服务,我会得到以下IP地址的预期结果:
# dig dogstatsdport.development.svc.cluster.local
; <<>> DiG 9.9.5-9+deb8u15-Debian <<>> dogstatsdport.development.svc.cluster.local
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32857
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;dogstatsdport.development.svc.cluster.local. IN A
;; ANSWER SECTION:
dogstatsdport.development.svc.cluster.local. 30 IN CNAME dogstatsdport.default.svc.cluster.local.
dogstatsdport.default.svc.cluster.local. 30 IN A 100.68.195.103
;; Query time: 0 msec
;; SERVER: 100.64.0.10#53(100.64.0.10)
;; WHEN: Thu Apr 26 11:02:14 UTC 2018
;; MSG SIZE rcvd: 113
这里有什么遗漏/错误?我如何解决外部记录?
Cluster目前在Kubernetes 1.8.12上运行,设置为kops 1.9.0 .
1 回答
问题在于使用的kube-dns版本1.14.9 .
应用以下命令更新到1.14.10修复它:
https://github.com/kubernetes/dns/releases状态为1.14.10: