? ? ? ? 三台机器：
????????????????master ip为192.168.1.100
? ? ? ? ? ? ? ? node1?ip为192.168.1.101
? ? ? ? ? ? ? ? node2 ip为192.168.1.102
? ? ? ? 需要部署其中一台节点机上部署mysql、nacos、oracle、redis随机指定即可，但需要访问matser能访问到,所以在master上部署了一个Nodport类型的service来供以端口外部访问，端口为：30306。
? ? ? ? 部署完毕，出现了连接192.168.1.100:30306连接失败，再次尝试成功，但查看数据库下表的列表的时候又出现连接失败。
? ? ? ? 随即使用telnet 192.168.1.100 30306：
[root@master ~]# telnet 192.168.1.100 3306
Trying 192.168.1.100...
telnet: connect to address 192.168.1.100: Connection refused
telnet: Unable to connect to remote host
[root@master ~]# telnet 192.168.1.100 30306
Trying 192.168.1.100...
telnet: connect to address 192.168.1.100: Connection refused
telnet: Unable to connect to remote host
[root@master ~]# telnet 192.168.1.100 30306
Trying 192.168.1.100...
Connected to 192.168.1.100.
Escape character is '^]'.
J
8.0.27w�j"`>)uxT
caching_sha2_password^[[A
!#08S01Got packets out of orderConnection closed by foreign host.
[root@master ~]# telnet 192.168.1.100 30306
Trying 192.168.1.100...
telnet: connect to address 192.168.1.100: Connection refused
telnet: Unable to connect to remote host
[root@master ~]# telnet 192.168.1.100 30306
Trying 192.168.1.100...
telnet: connect to address 192.168.1.100: Connection refused
telnet: Unable to connect to remote host
[root@master ~]# telnet 192.168.1.100 30306
Trying 192.168.1.100...
Connected to 192.168.1.100.
Escape character is '^]'.
J
8.0.27ICO+v;X�GcGN&dbZMTcaching_sha2_password^CConnection closed by foreign host.
[root@master ~]# 问题解决：
? ? ? ? 后来发现是service的endpoint节点把三个node都囊括进来了，因为其他节点还有nacos等等的pod，只需要规定pod label，在Service.spec.selector规定相关selector即可。
# 获取service列表
[root@master k8s]# kubectl get svc -n jees-ns
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
jees-mysql-svc NodePort 10.96.90.157 <none> 3306:30306/TCP 20s
jees-nacos-svc NodePort 10.111.142.165 <none> 7848:30748/TCP,8848:30848/TCP,9848:30948/TCP,9849:30949/TCP 20s
jees-oracle-svc NodePort 10.100.198.246 <none> 1521:30521/TCP 20s
jees-redis-svc NodePort 10.103.240.127 <none> 6379:30379/TCP 20s
# 查看service详情，可以看到Selector下生效的selector只有key为app
# Endpoints有N > 1个
[root@master k8s]# kubectl describe svc jees-mysql-svc -n jees-ns
Name: jees-mysql-svc
Namespace: jees-ns
Labels: app=small-shop
use-for=mysql
Annotations: desc: mysql使用的service，通过域名(jees-mysql-svc.jees-ns.svc.cluster.local)形式访问
Selector: app=small-shop
Type: NodePort
IP: 10.96.90.157
Port: 3306-out-port 3306/TCP
TargetPort: 3306/TCP
NodePort: 3306-out-port 30306/TCP
Endpoints: 10.244.1.97:3306,10.244.1.98:3306,10.244.2.106:3306 + 1 more...
Session Affinity: None
External Traffic Policy: Cluster
Events: <none>
# 查看pods列表详情信息包含IP，结合上面Endpoints可以看到nacos也进去了...
[root@master k8s]# kubectl get pods -n jees-ns -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
jees-mysql-deployment-6d74966d4-dv4l2 1/1 Running 0 2m1s 10.244.1.97 node1 <none> <none>
jees-nacos-deployment-6c88cd7ff6-vvmqh 1/1 Running 0 2m1s 10.244.2.106 node2 <none> <none>
jees-oracle-deployment-6b675dc7d-6fknr 1/1 Running 0 2m1s 10.244.1.98 node1 <none> <none>
jees-redis-deployment-8dfdccd6-5wbdl 1/1 Running 0 2m1s 10.244.2.107 node2 <none> <none>? ? ? ? 所以查看YAML内容，确实因为不小心底部有个覆盖了：
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: small-shop
use-for: mysql
annotations:
desc: mysql使用的service，通过域名(jees-mysql-svc.jees-ns.svc.cluster.local)形式访问
name: jees-mysql-svc
namespace: jees-ns
spec:
selector: # -------- 此处和下面重复，覆盖了此处
app: small-shop
use-for: mysql
type: NodePort
# clusterIP: None # 将clusterIP设置为None，即可创建headliness Service
ports:
- name: 3306-out-port
targetPort: 3306 # POD控制器中定义的端口
nodePort: 30306
port: 3306 # 集群内服务访问端口
selector:
app: small-shop # -------- 此处和上面重复，覆盖了上面修改过来重新delete，再create即可。