容器化时NodeJS应用程序停止工作[容器中的FTP服务器] [英] NodeJS application stops working when containerised [FTP server in a container]
问题描述
我正在尝试容器化一个 ftp 服务器 NodeJS 应用程序.当我用 npm 运行它时它工作正常，但当我在容器内运行它时它没有响应.
I am trying to containerise an ftp server NodeJS application. It works fine when I run it with npm but it does not respond when I run it inside of a container.
这是节点应用程序:src/index.js 文件
This is the node app: The src/index.js file
const FtpSvr = require ( 'ftp-srv' );
const hostname = '127.0.0.1';
const port = 21;
const ftpServer = new FtpSvr ({
url:`ftp://${hostname}:${port}`,
anonymous:true
} );
ftpServer.on('login', ({connection, username, password}, resolve, reject) =>
{
resolve({root : "./"})
connection.on('STOR', (error, fileName) => {
console.log("STOR")
});
});
ftpServer.on ( 'client-error', (connection, context, error) =>
{
console.log ( `error: ${error}` );
});
ftpServer.listen().then(() => {console.log(`Server running at http://${hostname}:${port}/`);});
我的 package.json 文件
my package.json file
{
"name": "ftp-server",
"version": "1.0.0",
"description": "FTP server to receive images from cameras and save them on Azure Blob storage",
"main": "index.js",
"scripts": {
"test": "echo "Error: no test specified" && exit 1",
"start": "node src/index.js"
},
"author": "Rakshak",
"license": "ISC",
"dependencies": {
"ftp-srv": "4.3.4"
}
}
我的 docker 文件
my docker file
FROM node:12
WORKDIR /app
COPY package.json ./
RUN npm install
COPY . .
EXPOSE 20-21
EXPOSE 65500-65515
CMD ["npm", "start"]
我正在使用 FileZilla 测试 FTP 服务器.当我使用 npm start 运行服务器并使用 FileZilla 连接时
I am testing the FTP server using FileZilla. When I run the server using npm start and connect using FileZilla
Connecting to 127.0.0.1:5000...
Status: Connection established, waiting for welcome message...
Status: Insecure server, it does not support FTP over TLS.
Status: Logged in
Status: Retrieving directory listing...
Status: Directory listing of "/" successful
我正在使用这个命令来构建 docker 镜像
I am using this command to build the docker image
docker build -t rrakshak/ftp-demo .
我正在使用它来运行 docker
And I am using this to run the docker
docker run -p 5000:5000 rrakshak/ftp-demo:latest
这是 FileZilla 控制台上的消息
This is the message on the FileZilla console
Connecting to 127.0.0.1:5000...
Status: Connection established, waiting for welcome message...
Error: Connection closed by server
Error: Could not connect to server
Status: Waiting to retry...
Status: Connecting to 127.0.0.1:5000...
Status: Connection established, waiting for welcome message...
Error: Connection closed by server
Error: Could not connect to server
看起来当服务器在容器内运行时，FileZilla 能够连接但没有收到它预期的文件列表响应.
It looks like when the server is running inside of a container the FileZilla is able to connect but is not receiving the file listing response it expects.
------------更新-----------
------------Update-----------------------
将主机设置为 0.0.0.给我一组关于 Filezilla 的新消息
setting the host to 0.0.0. give me a new set of messages on Filezilla
Status: Connecting to 127.0.0.1:21...
Status: Connection established, waiting for welcome message...
Status: Insecure server, it does not support FTP over TLS.
Status: Logged in
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/"
Command: TYPE I
Response: 200 Switch to "binary" transfer mode.
Command: PASV
Response: 502 Command not supported
Command: PORT 127,0,0,1,231,209
Response: 500 The given address is not yours
Error: Failed to retrieve directory listing
为什么我的应用在 node 中运行时可以运行，但在容器化时却不行?
Why does my app work when I run it in node but not when I containerise it?
推荐答案
监听容器中的0.0.0.0:5000，定义被动端口
Listen on 0.0.0.0:5000 in the container, with passive ports defined
const FtpSvr = require ( 'ftp-srv' );
const hostname = '0.0.0.0';
const port = 5000;
const ftpServer = new FtpSvr ({
url: `ftp://${hostname}:${port}`,
anonymous: true,
pasv_url: `ftp://${hostname}:${port}`,
pasv_min: 65500,
pasv_max: 65515,
});
按原样构建容器，然后使用映射的以下端口运行，这些端口都可以在 ftp 连接中使用:
Build the container as is and then run with the following ports mapped, which can all be used in an ftp connection:
docker run -p 5000:5000 -p 65500-65515:65500-65515 --rm rrakshak/ftp-demo
给出响应:
$ curl ftp://localhost:5000
-rw-r--r-- 1 1 1 141 Oct 21 01:22 Dockerfile
drwxr-xr-x 1 1 1 4096 Oct 21 01:21 node_modules
-rw-r--r-- 1 1 1 21137 Oct 21 01:21 package-lock.json
-rw-r--r-- 1 1 1 52 Oct 21 01:21 package.json
-rw-r--r-- 1 1 1 660 Oct 21 01:23 server.js
-rw-r--r-- 1 1 1 20287 Oct 21 01:21 yarn.lock
ftp 客户端必须设置为使用被动模式.
The ftp client must be set to use passive mode.
当 FTP 客户端处于 主动模式时，FTP 服务器会收到一个 来自客户端的 PORT 命令，并创建一个从容器返回到客户端的新 TCP 连接，以获取该 PORT 上的数据.
When an FTP client is in active mode, the FTP server receives a PORT command from the client and creates a new TCP connection from the container back out to the client for data on that PORT.
由于 Docker 端口映射到容器中，此数据连接的源地址通常与 FTP 客户端用作 FTP 服务器的初始目标的地址不匹配.在经典服务器上设置 NAT 后的 FTP 服务器时会出现类似问题.
Due to the Docker port mapping into the container, the source address of this data connection often won't match what the FTP client is using as the initial destination for the FTP server. Similar issues occur when setting up FTP servers behind NAT on classic servers.
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