无法从同一网络上的容器获取响应，Docker compose，Mountebank

Question

我有一个Go应用程序和三个docker容器，用于应用程序、数据库和mountebank到mock/stub HTTP响应。

我希望我的mountebank容器在test_api(应用程序容器(发出请求时返回适当的响应。

当我使用Postman调用端点时，mountebank容器会返回正确的响应。

然而，当我在test_api容器中的代码像下面的代码一样发送GET请求时，它总是接收

拨号tcp 127.0.0.1:3000：连接：连接被拒绝

以下是test_api如何向mountebank容器发送请求

func getSuper(id string) (*float64, error) {
var url = "http://localhost:3000/ato/employee/?/balance"
url = strings.Replace(url, "?", id, 1)
log.Println("Sending request to this url: ", url)
resp, err := http.Get(url)
if err != nil {
return nil, &errorhandling.RequestError{Context: "getSuper calling ato api", Code: errorhandling.Internal, Message: err.Error()}
}
body, err := resposeToByte(resp)
if err != nil {
log.Println("err in coverting response to byte[]:", err)
return nil, &errorhandling.RequestError{Context: "getsuper resposeToByte", Code: errorhandling.Internal, Message: err.Error()}
}
superData, err := UnmarshalSuperDetails(body)
if err != nil {
return nil, &errorhandling.RequestError{Context: "UnmarshalSuperDetails())", Code: errorhandling.Internal, Message: err.Error()}
}
log.Println("super details ", superData)
return &superData.SuperBalance, nil
}

这是我的码头管理员撰写的

version: '3.7'
services:
db:
container_name: "test_db"
platform: linux/x86_64
build:
context: .
dockerfile: db.Dockerfile
networks:
- default
restart: always
ports:
# <Port exposed> : < MySQL Port running inside container>
- "3306:3306"
# setting some env vars to create the DB
environment:
MYSQL_RANDOM_ROOT_PASSWORD: "secret"
MYSQL_DATABASE: "IGD"
MYSQL_USER: "tester"
MYSQL_PASSWORD: "secret"
# OR if you want to use "root" as the user, just these two lines
# MYSQL_ROOT_PASSWORD: ${DATABASE_PASSWORD}
# MYSQL_DATABASE: ${DATABASE_NAME}
# we mount a data volume to make sure we don't lose data
volumes:
- mysql_data:/var/lib/mysql
command: --default-authentication-plugin=mysql_native_password
api:
container_name:  "test_api"
# we want to use the image which is build from our Dockerfile
build:
context: .
dockerfile: api.Dockerfile
ports:
- "8080:8080"
# we are depending on the mysql backend
depends_on:
- db
# We mount the working dir into the container, handy for development
# This is what makes the hot reloading work inside of a Docker container
volumes:
- .:/app/  
mountebank:
container_name: mountebank
image: jkris/mountebank:latest
build:
context: .
dockerfile: mb.Dockerfile
volumes:
- ./imposters:/imposters
ports:
- 2525:2525
- 3000:3000
#- 8090:8090
command: --configfile /imposters/imposter.json --allowInjection
networks:
- default
networks:
default:
volumes:
mysql_data:

我的冒名顶替者：

{ "port": 3000,
"protocol": "http",
"stubs": [
{
"predicates": [
{
"equals": {"path":"/ato/employee/a/balance"}
}
],
"responses": [
{
"is": {
"statusCode": 404,
"headers": {
"Content-Type": "application/json"
},
"body": {"error": "value not available"}
}
}
]
},
{
"predicates": [
{
"equals": {"path":"/ato/employee/58957fc7-4e24-44e5-9eb1-a7fa0297613b/balance"}
}
],
"responses": [
{
"is": {
"statusCode": 200,
"headers": {
"Content-Type": "application/json"
},
"body": { "employeeId":"50ccf5d6-2056-4e0c-a160-4e51638410c7",
"superBalance":1050.0}
}
},
continues...

这是我的挂载银行的docker文件

FROM alpine:3.14
ENV MOUNTEBANK_VERSION=2.4.0
RUN apk add --update nodejs-lts && 
apk add --update npm
RUN npm install -g mountebank@${MOUNTEBANK_VERSION} --production
EXPOSE 2525
ENTRYPOINT ["mb"]
CMD ["start"]

如何更改代码以使test_api从mountebank获得正确的响应？

Answer 1

您应该更改test_api中的以下行；

var url = "http://localhost:3000/ato/employee/?/balance"

有以下一个；

var url = "http://mountebank:3000/ato/employee/?/balance"

由于这些是不同的容器，您应该在Docker环境中指定它们的名称或IP。您的test_api请求到其本地主机，而3000没有打开的端口，您将收到连接被拒绝的错误。您可以查看Docker Networking了解更多信息。