Kubernetes连接外部数据源
Kubernetes架构下比较核心的问题是数据如何persistance,虽然提供了Persistent volumn的方式，但是对于像数据库之类的产品在kubernetes集群环境中运行和管理还是很有难度的，Kubernetes提供了endpoints这种模式让外部的服务映射成内部的服务，这样比较好的解决了集群对外的连接问题，如果我们去连接外部的一个oracle数据库，具体的步骤如下:
[*]建立endpoints和service.
# cat jdbc-endpoint.yaml
apiVersion: v1
kind: Endpoints
metadata:
name: jdbc
subsets:
- addresses:- ip: 10.182.168.244 ports:
- port: 1521 protocol: TCP
为了方便，我们固定了service的集群地址
# cat jdbcservice.yaml
apiVersion: v1
kind: Service
metadata:
name: jdbc
spec:
clusterIP:
10.254.150.201 ports:
- port: 1521 targetPort:
1521 protocol: TCP
需要注意的是，service和endpoints的名字要相同，另外如果delete了service.再重新建立的时候要再把endpoints建立一遍。
在这个service的表里，我们看到jdbc服务绑在了201这个地址上。
# kubectl get services
NAME CLUSTER
-IP EXTERNAL-IP PORT(S) AGE
helloworldsvc
10.254.43.122 <nodes> 7001:30001/TCP 12m
jdbc
10.254.150.201 <none> 1521/TCP 30m
kubernetes
10.254.0.1 <none> 443/TCP 121d
registry
10.254.174.54 <nodes> 5000:30002/TCP 20h
[*]images的配置
然后对我们的weblogic images进行jdbc的配置。
https://images2017.cnblogs.com/blog/892532/201709/892532-20170920101642306-1347261782.png
点击Test Configuration,如果测试不过，weblogic不允许建立连接池成功.
https://images2017.cnblogs.com/blog/892532/201709/892532-20170920101733759-1067642873.png
https://images2017.cnblogs.com/blog/892532/201709/892532-20170920102008243-495920448.png
在运行pod的节点上运行docker ps找到启动image的容器id.
# docker ps
CONTAINER>
d2c1dc2a2cef
1213-helloworld:v1 "startWebLogic.sh" 7 minutes ago Up 7 minutes k8s_weblogichelloworld.9efb3a79_helloworld-service-vfd10_default_6162d68a-9da9-11e7-b746-08002797edef_026d2cc4
85e04042041a registry.access.redhat.com
/rhel7/pod-infrastructure:latest "/pod" 7 minutes ago Up 7 minutes k8s_POD.15c40ba1_helloworld-service-vfd10_default_6162d68a-9da9-11e7-b746-08002797edef_b59984a7
96acfd65eb3a registry
"/entrypoint.sh /etc/" 23 minutes ago Up 23 minutes k8s_registry.71ab5625_registry-7nj8q_default_19ab0b7f-9cff-11e7-bf9d-08002797edef_fb5ae620
63652932256c registry.access.redhat.com
/rhel7/pod-infrastructure:latest "/pod" 23 minutes ago Up 23 minutes k8s_POD.100f0b9e_registry-7nj8q_default_19ab0b7f-9cff-11e7-bf9d-08002797edef_98dd7f3f
1ed61c53625f gcr.io
/google_containers/etcd-amd64:2.2.1 "/usr/local/bin/etcd " 47 minutes ago Up 47 minutes k8s_etcd.bb974d90_kube-dns-v11-x0vr3_kube-system_5dd26461-3ef1-11e7-acf2-08002797edef_7316989c
fb8545a4aba4 gcr.io
/google_containers/exechealthz:1.0 "/exechealthz '-cmd=n" 47 minutes ago Up 47 minutes k8s_healthz.525e4aad_kube-dns-v11-x0vr3_kube-system_5dd26461-3ef1-11e7-acf2-08002797edef_cec4d740
aa6c4caf3fa7 gcr.io
/google_containers/skydns:2015-10-13-8c72f8c "/skydns -machines=ht" 47 minutes ago Up 47 minutes k8s_skydns.96837166_kube-dns-v11-x0vr3_kube-system_5dd26461-3ef1-11e7-acf2-08002797edef_5da89b81
5930dae5b843 registry.access.redhat.com
/rhel7/pod-infrastructure:latest "/pod" 47 minutes ago Up 47 minutes k8s_POD.4efc54ff_kube-dns-v11-x0vr3_kube-system_5dd26461-3ef1-11e7-acf2-08002797edef_3e3af088
生成新的images
# docker commit -m "jdbc" -a "ericnie" d2c1dc2a2cef 1213-helloworld-jdbc:v1
sha256:953e124483d2bcc03b3f46c8e6d935e3746634d78942cc477e31888c8d569171
[*]验证
修改weblogic replication control指向1213-helloworld-jdbc:v1 images,启动后看到连接建立.
weblogic端
https://images2017.cnblogs.com/blog/892532/201709/892532-20170920102931743-489212515.png
数据库端
数据库端原来的jdbc链接
https://images2017.cnblogs.com/blog/892532/201709/892532-20170920104803525-1168438591.png
Pod完全启动后的连接
https://images2017.cnblogs.com/blog/892532/201709/892532-20170920104944962-1855211680.png
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