Docker容器通过http进行通信

Question

我有两个Spring Web服务，应该通过http进行通信。它们都在我的机器上通过openjdk：8-jre-alpine在dcoker容器中运行。这是POST查询失败并显示“Connection refused”：

public String createPost(int playerCount) {
    String uri = URI + "/create";
    UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(uri)
            .queryParam("playerCount", playerCount);
    HttpEntity<?> entity = new HttpEntity<>(headers);
    ResponseEntity<String> response = rest.exchange(
            builder.build().encode().toUri(),
            HttpMethod.POST,
            entity,
            String.class);
    logger.info("Create request");
    return response.getBody();
}

URI是http://localhost:8090/game这是其他服务的对应控制器：

@RequestMapping(
        path = "create",
        method = RequestMethod.POST,
        consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
@ResponseStatus(HttpStatus.OK)
public ResponseEntity<Long> create(@RequestParam("playerCount") int playerCount) {
    long gameId = gameService.create(playerCount);
    HttpHeaders headers = new HttpHeaders();
    headers.add("Access-Control-Allow-Origin", "*");
    return new ResponseEntity<>(gameId, headers, HttpStatus.OK);
}

我只是用run -p 8080:8080和'8090：8090'运行两个容器。正如我之前所说的“拒绝连接”如何正确设置通信？ 注意：如果我使用Intellij运行它，它可以正常工作。

Answer 1

default Docker bridge network不提供没有“链接”的容器之间的直接通信。链接已被弃用，建议使用user defined network。

为容器创建user defined network并通过容器名称访问每个服务

docker network create spring
docker run --detach --network=spring --name first -p 8080:8080 busybox \
  nc -llp 8080 0.0.0.0 -e echo first
docker run --detach --network=spring --name second -p 8090:8090 busybox \
  nc -llp 8090 0.0.0.0 -e echo second

然后，您可以ping另一个容器或连接到网络服务

# First to second
docker exec first ping second
docker exec first nc second 8090

# Second to first
docker exec second ping first
docker exec second nc first 8080

使用Compose也可以完成相同的定义，

version: "2.1"
services:
  first:
    image: first
    ports:
      - '8080:8080'
  second:
    image: second
      - '8090:8090'

根据yaml配置为您配置网络和服务名称。

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