MarshalW/using-localhost-in-dockerfile.md

## using-localhost-in-dockerfile.md

      
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              using-localhost-in-dockerfile.md
            
          
    在 Dockerfile 中使用 localhost

需要增加2点：

localhost 替换为 host.docker.internal
执行时增加 --network="host"，比如 docker build --network="host" -t test .

启动一个本地的 http server 做测试：
# http://localhost:8080
echo 'test' > index.html && npx http-server .
Dockfile：
FROM curlimages/curl
RUN curl http://host.docker.internal:8080
执行：
$ docker build --network="host" -t test .
[+] Building 0.2s (6/6) FINISHED                                                                                   
 => [internal] load build definition from Dockerfile                                                          0.0s
 => => transferring dockerfile: 35B                                                                           0.0s
 => [internal] load .dockerignore                                                                             0.0s
 => => transferring context: 2B                                                                               0.0s
 => [internal] load metadata for docker.io/curlimages/curl:latest                                             0.0s
 => [1/2] FROM docker.io/curlimages/curl                                                                      0.0s
 => CACHED [2/2] RUN curl http://host.docker.internal:8080                                                    0.0s
 => exporting to image                                                                                        0.0s
 => => exporting layers                                                                                       0.0s
 => => writing image sha256:edc6521f7cd23c47e3cbb2a2fe50b9f5db5829311b162ac92437e04154450301                  0.0s
 => => naming to docker.io/library/test