Question

在本地开发环境（Ubuntu）上，已安装Docker和Minishift。

使用Docker启动具有mariadb：10.3.11的容器：

docker run -e MYSQL_ROOT_PASSWORD=root -p 3306:3306 --name mariadb 4f2e75647d2a

从主机系统运行的curl具有以下输出：

curl 172.17.0.1:3306
curl: (56) Recv failure: Connection reset by peer
5.5.5-10.3.11-MariaDB-1:10.3.11+maria~bionic

QpatFAPM���rv{(RC:7G@H+mysql_native_password!��#08S01Got packets out of order%

目标是从Minishift中运行的Pod连接到此MariaDB。我遵循了本教程：https://docs.okd.io/latest/dev_guide/integrating_external_services.html

apiVersion: v1                                                                             
kind: List                                                                                       
items:
- kind: "Service"
  apiVersion: "v1"
  metadata:
    name: "external-mysql-service"
  spec:
    ports:
      - name: "mysql"
        protocol: "TCP"
        port: 3306
        targetPort: 3306 
        nodePort: 0
  selector: {} 
- kind: "Endpoints"
  apiVersion: "v1"
  metadata:
    name: "external-mysql-service" 
  subsets: 
    - addresses:
        - ip: "172.17.0.1"
      ports:
        - port: 3306 
          name: "mysql"

但是，吊舱无法通过以下错误连接到MariaDB：

2019-02-19 18:00:42 [ERROR] HikariPool:567 - HikariPool-1 - Exception during pool initialization.
 java.sql.SQLNonTransientConnectionException: Could not connect to address=(host=external-mysql-service)(port=3306)(type=master) : Connection refused (Connection refused)

如果我通过OpenShift Web控制台中的“终端”标签连接到Pod，然后尝试

$ curl -v external-mysql-service:3306
* Rebuilt URL to: external-mysql-service:3306/
*   Trying 172.30.23.62...
* TCP_NODELAY set
* connect to 172.30.23.62 port 3306 failed: Connection refused
* Failed to connect to external-mysql-service port 3306: Connection refused
* Closing connection 0
curl: (7) Failed to connect to external-mysql-service port 3306: Connection refused

如何建立从Minishift吊舱到Docker容器的连接？

总体目标是使用任意外部服务。

Answer 1

从与Minishift一起使用的vm-driver的角度来看，端点的IP必须是主机系统的IP。

在我的情况下，虚拟机驱动程序是VirtualBox，访问主机系统的IP是10.0.2.2： https://github.com/kubernetes/minikube/issues/352#issuecomment-237615642

更改端点的IP对我有用：

- kind: "Endpoints"
  apiVersion: "v1"
  metadata:
    name: "external-mysql-service" 
  subsets: 
    - addresses:
        - ip: "10.0.2.2"
      ports:
        - port: 3306 
          name: "mysql"

现在MiniShift内部的pod可以访问在主机上与docker一起运行的MariaDB。

集成外部服务：从在Minishift上运行的Pod连接到Docker MariaDB

1 个答案: