Docker - 无法连接到 运行 图片
Docker - failed to connect to running image
在我开始解释我的错误之前，让我说我是一个 Windows 用户并且没有太多使用 Unix 命令的经验。因此，这些步骤中的每一步都是使用 Docker 快速启动终端 (MINGW64) 完成的。
几周前我第一次听说 docker 并想将它用于 node/express 网站。所以我在我的 Synology 服务器上安装了 Docker 软件包。
完成网站后，我做了以下工作：
- 我遵循了本网站上的说明：
https://docs.docker.com/windows/step_one/ 直到最后一步，
一切正常（包括
docker run hello-world）
- 然后是"Dockerizing a Node.js web app"：
https://docs.docker.com/engine/examples/nodejs_web_app/
文件层次结构：
src (C:.....\projectname)
--assets (folder)
--controllers (folder)
--public (folder)
--src (folder)
--util (folder)
--views (folder)
--node_modules (folder)
--bin (folder)
----www (file, no extention)
--app.js (file)
--Dockerfile (file, no extention)
--package.json (file)
至于内容：
www:
#!/usr/bin/env node
/**
* Module dependencies.
*/
var app = require('../app');
var debug = require('debug')('projectname:server');
var http = require('http');
/**
* Get port from environment and store in Express.
*/
var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);
/**
* Create HTTP server.
*/
var server = http.createServer(app);
/**
* Listen on provided port, on all network interfaces.
*/
server.listen(port);
server.on('error', onError);
server.on('listening', onListening);
/**
* Normalize a port into a number, string, or false.
*/
function normalizePort(val) {
var port = parseInt(val, 10);
if (isNaN(port)) {
// named pipe
return val;
}
if (port >= 0) {
// port number
return port;
}
return false;
}
/**
* Event listener for HTTP server "error" event.
*/
function onError(error) {
if (error.syscall !== 'listen') {
throw error;
}
var bind = typeof port === 'string'
? 'Pipe ' + port
: 'Port ' + port;
// handle specific listen errors with friendly messages
switch (error.code) {
case 'EACCES':
console.error(bind + ' requires elevated privileges');
process.exit(1);
break;
case 'EADDRINUSE':
console.error(bind + ' is already in use');
process.exit(1);
break;
default:
throw error;
}
}
/**
* Event listener for HTTP server "listening" event.
*/
function onListening() {
var addr = server.address();
var bind = typeof addr === 'string'
? 'pipe ' + addr
: 'port ' + addr.port;
debug('Listening on ' + bind);
}
app.js:
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(require('./controllers'));
};
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: {}
});
});
module.exports = app;
package.json:
{
"name": "projectname",
"version": "0.0.0",
"private": true,
"scripts": {
"start": "node ./bin/www"
},
"dependencies": {
"bcrypt-nodejs": "0.0.3",
"body-parser": "~1.13.2",
"bookshelf": "^0.9.2",
"cookie-parser": "~1.3.5",
"debug": "~2.2.0",
"express": "~4.13.1",
"express-session": "^1.13.0",
"i18n": "^0.8.0",
"jade": "~1.11.0",
"knex": "^0.10.0",
"morgan": "~1.6.1",
"mysql": "^2.10.2",
"passport": "^0.3.2",
"passport-local": "^1.0.0",
"serve-favicon": "~2.3.0"
},
"devDependencies": {
"autoprefixer": "^6.3.3",
"browserify": "^13.0.0",
"connect-livereload": "^0.5.4",
"grunt": "^0.4.5",
"grunt-browserify": "^4.0.1",
"grunt-contrib-cssmin": "^0.14.0",
"grunt-contrib-sass": "^0.9.2",
"grunt-contrib-uglify": "^0.11.1",
"grunt-contrib-watch": "^0.6.1",
"grunt-postcss": "^0.7.2"
}
}
因此，正如您在 package.json 和 www（由 express 生成器命令生成）中看到的那样，我必须将 npm start 写入 运行 node/express服务器。
Docker文件:
FROM centos:centos6
RUN yum install -y epel-release
RUN yum install -y nodejs npm
COPY package.json /projectname/package.json
RUN cd /projectname; npm install --production
COPY . /projectname
EXPOSE 8080
CMD ["npm", "start"]
构建成功后 docker build -t username/projectname . 我收到 安全警告：
Successfully built 5ed562273b56
SECURITY WARNING: You are building a Docker image from Windows against a non-Windows Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.
除此之外没有抛出任何错误，所以我 运行 图片：docker run -p 49160:8080 -d username/projectname。之后我得到一个长哈希字符串
de297db51ab6fb3f842abb58267c1e189d2b9de51715a619a2f5431e868dc54f
- 仍然遵循 https://docs.docker.com/engine/examples/nodejs_web_app/ 上的原则。为了测试图像，我使用
docker ps 列出了 容器 ID，这让我得到了这个：
CONTAINER ID | IMAGE | COMMAND | CREATED | STATUS | PORTS | NAMES
完全空了！什么都没有，除了 table 的 headers... 但是当我使用 link 中提供的代码并构建他们的图像时，它确实给了我一个结果（如文章中所述):
CONTAINER ID | IMAGE | COMMAND | CREATED | STATUS | PORTS | NAMES
26d3ac309d81 | username/centos-node-testing | "node /src/index.js" | 35 minutes ago | Up 35 minutes | 0.0.0.0:49160->8080/tcp | gigantic_ritchie
- 为了确定，我尝试使用 curl-command:
curl -i 192.168.99.100:49160 调用应用程序。不幸的是，这给了我一个错误：
curl: (7) Failed to connect to 192.168.99.100 port 49160: Connection refused
使用 docker-machine ip 命令检索 IP 地址。
作为最后的手段，有人建议使用以下命令 docker run username/projectname 简单地 运行 应用程序。然而，这给了我一个错误：
npm ERR! Error: ENOENT, open '/package.json'
npm ERR! If you need help, you may report this log at:
npm ERR! http://github.com/isaacs/npm/issues
npm ERR! or email it to:
npm ERR!
npm ERR! System Linux 4.1.19-boot2docker
npm ERR! command "node" "/usr/bin/npm" "start"
npm ERR! cwd /
npm ERR! node -v v0.10.42
npm ERR! npm -v 1.3.6
npm ERR! path /package.json
npm ERR! code ENOENT
npm ERR! errno 34
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /npm-debug.log
npm ERR! not ok code 0
知道是什么原因造成的吗？
您的容器不存在，因为您提供的命令（CMD，上面）返回非零退出状态，容器因失败而被销毁。在您的 Dockerfile 中，让我们尝试类似以下的操作，这应确保 npm start 是 运行 来自您的项目根目录：
FROM centos:centos6
RUN yum install -y epel-release
RUN yum install -y nodejs npm
COPY package.json /projectname/package.json
# Set the working directory
WORKDIR /projectname
RUN npm install --production
COPY . /projectname
EXPOSE 8080
CMD ["npm", "start"]
此外，如果您使用 docker run -it username/projectname /bin/bash。
，您将来可能会幸运地对容器进行故障排除
在我开始解释我的错误之前，让我说我是一个 Windows 用户并且没有太多使用 Unix 命令的经验。因此，这些步骤中的每一步都是使用 Docker 快速启动终端 (MINGW64) 完成的。
几周前我第一次听说 docker 并想将它用于 node/express 网站。所以我在我的 Synology 服务器上安装了 Docker 软件包。
完成网站后，我做了以下工作：
- 我遵循了本网站上的说明：
https://docs.docker.com/windows/step_one/ 直到最后一步，
一切正常（包括
docker run hello-world）
- 然后是"Dockerizing a Node.js web app"： https://docs.docker.com/engine/examples/nodejs_web_app/
文件层次结构：
src (C:.....\projectname)
--assets (folder)
--controllers (folder)
--public (folder)
--src (folder)
--util (folder)
--views (folder)
--node_modules (folder)
--bin (folder)
----www (file, no extention)
--app.js (file)
--Dockerfile (file, no extention)
--package.json (file)
至于内容： www:
#!/usr/bin/env node
/**
* Module dependencies.
*/
var app = require('../app');
var debug = require('debug')('projectname:server');
var http = require('http');
/**
* Get port from environment and store in Express.
*/
var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);
/**
* Create HTTP server.
*/
var server = http.createServer(app);
/**
* Listen on provided port, on all network interfaces.
*/
server.listen(port);
server.on('error', onError);
server.on('listening', onListening);
/**
* Normalize a port into a number, string, or false.
*/
function normalizePort(val) {
var port = parseInt(val, 10);
if (isNaN(port)) {
// named pipe
return val;
}
if (port >= 0) {
// port number
return port;
}
return false;
}
/**
* Event listener for HTTP server "error" event.
*/
function onError(error) {
if (error.syscall !== 'listen') {
throw error;
}
var bind = typeof port === 'string'
? 'Pipe ' + port
: 'Port ' + port;
// handle specific listen errors with friendly messages
switch (error.code) {
case 'EACCES':
console.error(bind + ' requires elevated privileges');
process.exit(1);
break;
case 'EADDRINUSE':
console.error(bind + ' is already in use');
process.exit(1);
break;
default:
throw error;
}
}
/**
* Event listener for HTTP server "listening" event.
*/
function onListening() {
var addr = server.address();
var bind = typeof addr === 'string'
? 'pipe ' + addr
: 'port ' + addr.port;
debug('Listening on ' + bind);
}
app.js:
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(require('./controllers'));
};
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: {}
});
});
module.exports = app;
package.json:
{
"name": "projectname",
"version": "0.0.0",
"private": true,
"scripts": {
"start": "node ./bin/www"
},
"dependencies": {
"bcrypt-nodejs": "0.0.3",
"body-parser": "~1.13.2",
"bookshelf": "^0.9.2",
"cookie-parser": "~1.3.5",
"debug": "~2.2.0",
"express": "~4.13.1",
"express-session": "^1.13.0",
"i18n": "^0.8.0",
"jade": "~1.11.0",
"knex": "^0.10.0",
"morgan": "~1.6.1",
"mysql": "^2.10.2",
"passport": "^0.3.2",
"passport-local": "^1.0.0",
"serve-favicon": "~2.3.0"
},
"devDependencies": {
"autoprefixer": "^6.3.3",
"browserify": "^13.0.0",
"connect-livereload": "^0.5.4",
"grunt": "^0.4.5",
"grunt-browserify": "^4.0.1",
"grunt-contrib-cssmin": "^0.14.0",
"grunt-contrib-sass": "^0.9.2",
"grunt-contrib-uglify": "^0.11.1",
"grunt-contrib-watch": "^0.6.1",
"grunt-postcss": "^0.7.2"
}
}
因此，正如您在 package.json 和 www（由 express 生成器命令生成）中看到的那样，我必须将 npm start 写入 运行 node/express服务器。
Docker文件:
FROM centos:centos6
RUN yum install -y epel-release
RUN yum install -y nodejs npm
COPY package.json /projectname/package.json
RUN cd /projectname; npm install --production
COPY . /projectname
EXPOSE 8080
CMD ["npm", "start"]
构建成功后
docker build -t username/projectname .我收到 安全警告：Successfully built 5ed562273b56
SECURITY WARNING: You are building a Docker image from Windows against a non-Windows Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.
除此之外没有抛出任何错误，所以我 运行 图片：docker run -p 49160:8080 -d username/projectname。之后我得到一个长哈希字符串
de297db51ab6fb3f842abb58267c1e189d2b9de51715a619a2f5431e868dc54f
- 仍然遵循 https://docs.docker.com/engine/examples/nodejs_web_app/ 上的原则。为了测试图像，我使用
docker ps列出了 容器 ID，这让我得到了这个：
CONTAINER ID | IMAGE | COMMAND | CREATED | STATUS | PORTS | NAMES
完全空了！什么都没有，除了 table 的 headers... 但是当我使用 link 中提供的代码并构建他们的图像时，它确实给了我一个结果（如文章中所述):
CONTAINER ID | IMAGE | COMMAND | CREATED | STATUS | PORTS | NAMES
26d3ac309d81 | username/centos-node-testing | "node /src/index.js" | 35 minutes ago | Up 35 minutes | 0.0.0.0:49160->8080/tcp | gigantic_ritchie
- 为了确定，我尝试使用 curl-command:
curl -i 192.168.99.100:49160调用应用程序。不幸的是，这给了我一个错误：
curl: (7) Failed to connect to 192.168.99.100 port 49160: Connection refused
使用 docker-machine ip 命令检索 IP 地址。
作为最后的手段，有人建议使用以下命令
docker run username/projectname简单地 运行 应用程序。然而，这给了我一个错误：npm ERR! Error: ENOENT, open '/package.json'
npm ERR! If you need help, you may report this log at:
npm ERR! http://github.com/isaacs/npm/issues
npm ERR! or email it to:
npm ERR!
npm ERR! System Linux 4.1.19-boot2docker
npm ERR! command "node" "/usr/bin/npm" "start"
npm ERR! cwd /
npm ERR! node -v v0.10.42
npm ERR! npm -v 1.3.6
npm ERR! path /package.json
npm ERR! code ENOENT
npm ERR! errno 34
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /npm-debug.log
npm ERR! not ok code 0
知道是什么原因造成的吗？
您的容器不存在，因为您提供的命令（CMD，上面）返回非零退出状态，容器因失败而被销毁。在您的 Dockerfile 中，让我们尝试类似以下的操作，这应确保 npm start 是 运行 来自您的项目根目录：
FROM centos:centos6
RUN yum install -y epel-release
RUN yum install -y nodejs npm
COPY package.json /projectname/package.json
# Set the working directory
WORKDIR /projectname
RUN npm install --production
COPY . /projectname
EXPOSE 8080
CMD ["npm", "start"]
此外，如果您使用 docker run -it username/projectname /bin/bash。