2024-07-01 00:15阅读: 84评论: 0推荐: 0

34、k8s-service类型-第五种-ExternalName-将外部服务接入到集群内部

 概念：ExternalName类型的service用于引入集群外的服务、它通过externalname属性指定外部一个服务的地址、然后在集群内部访问此service就可以访问到外部的服务了

案例

 1、新建ExternalName的yaml文件：vim service-externalname.yaml
-------------------------------------------------------
apiVersion: v1
kind: Service
metadata:
  name: service-externalname
  namespace: dev
spec:
  type: ExternalName
  externalName: www.baidu.com
-----------------------------------------------------------
2、创建externalname：kubectl create -f service-externalname.yaml
3、查看：kubectl get svc service-externalname -ndev
----------------------------------------------------------------
NAME                   TYPE           CLUSTER-IP   EXTERNAL-IP     PORT(S)   AGE
service-externalname   ExternalName   <none>       www.baidu.com   <none>    46s
 
#其中EXTERNAL-IP    是指向外部的地址
---------------------------------------------------------------------------------
4、查看详情：kubectl describe svc service-externalname -ndev
 
5、域名解析访问：dig @10.96.0.10 service-externalname.dev.svc.cluster.local
    ·注意这个10.96.0.10 IP是域名解析服务通过进到pod里面获取：查看pod里面的文件：cat /etc/resolv.conf
-------------------------------------------------------------------------------------
; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.14 <<>> @10.96.0.10 service-externalname.dev.svc.cluster.local
; (1 server found)
;; global options: +cmd
;; Got answer:
;; WARNING: .local is reserved for Multicast DNS
;; You are currently testing what happens when an mDNS query is leaked to DNS
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10492
;; flags: qr aa rd; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;service-externalname.dev.svc.cluster.local. IN A
 
;; ANSWER SECTION:
service-externalname.dev.svc.cluster.local. 30 IN CNAME www.baidu.com.        #这里就是访问的外部地址
www.baidu.com.          30      IN      CNAME   www.a.shifen.com.     
www.a.shifen.com.       30      IN      A       14.119.104.254
www.a.shifen.com.       30      IN      A       14.119.104.189
 
;; Query time: 35 msec
;; SERVER: 10.96.0.10#53(10.96.0.10)
;; WHEN: Mon Sep 04 23:22:33 CST 2023
;; MSG SIZE  rcvd: 247
---------------------------------------------------------------------------------------------

上一篇33、k8s-service类型-第四种-LoadBalancer-（与nodeport类似、需要外部环境支持）-外部访问

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本文作者：littlecc

本文链接：https://www.cnblogs.com/littlecc/p/17678405.html

posted @ 2024-07-01 00:15 little小新阅读(84) 评论(0) 编辑收藏举报

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34、k8s-service类型-第五种-ExternalName-将外部服务接入到集群内部

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	1、新建ExternalName的yaml文件：vim service-externalname.yaml
	-------------------------------------------------------
	apiVersion: v1
	kind: Service
	metadata:
	name: service-externalname
	namespace: dev
	spec:
	type: ExternalName
	externalName: www.baidu.com
	-----------------------------------------------------------
	2、创建externalname：kubectl create -f service-externalname.yaml
	3、查看：kubectl get svc service-externalname -ndev
	----------------------------------------------------------------
	NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
	service-externalname ExternalName <none> www.baidu.com <none> 46s

	#其中EXTERNAL-IP 是指向外部的地址
	---------------------------------------------------------------------------------
	4、查看详情：kubectl describe svc service-externalname -ndev

	5、域名解析访问：dig @10.96.0.10 service-externalname.dev.svc.cluster.local
	·注意这个10.96.0.10 IP是域名解析服务通过进到pod里面获取：查看pod里面的文件：cat /etc/resolv.conf
	-------------------------------------------------------------------------------------
	; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.14 <<>> @10.96.0.10 service-externalname.dev.svc.cluster.local
	; (1 server found)
	;; global options: +cmd
	;; Got answer:
	;; WARNING: .local is reserved for Multicast DNS
	;; You are currently testing what happens when an mDNS query is leaked to DNS
	;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10492
	;; flags: qr aa rd; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1
	;; WARNING: recursion requested but not available

	;; OPT PSEUDOSECTION:
	; EDNS: version: 0, flags:; udp: 4096
	;; QUESTION SECTION:
	;service-externalname.dev.svc.cluster.local. IN A

	;; ANSWER SECTION:
	service-externalname.dev.svc.cluster.local. 30 IN CNAME www.baidu.com. #这里就是访问的外部地址
	www.baidu.com. 30 IN CNAME www.a.shifen.com.
	www.a.shifen.com. 30 IN A 14.119.104.254
	www.a.shifen.com. 30 IN A 14.119.104.189

	;; Query time: 35 msec
	;; SERVER: 10.96.0.10#53(10.96.0.10)
	;; WHEN: Mon Sep 04 23:22:33 CST 2023
	;; MSG SIZE rcvd: 247
	---------------------------------------------------------------------------------------------