如何打印CloudFoundry上应用运行时的环境变量

如果是运行在SAP云平台CloudFoundry环境下的应用，可以直接在云平台操作台的Environment Variables里查看环境变量：

{"VCAP_SERVICES": {"redis": [{"label": "redis","provider": null,"plan": "v3.0-dev","name": "jerryredis","tags": ["redis","keyvalue"],"instance_name": "jerryredis","binding_name": null,"credentials": {"hostname": "10.0.241.43","ports": {"6379/tcp": "51431"},"port": "50432","password": "IFGX3bKPRt7Mu4Lk","end_points": [{"network_id": "SF","host": "10.11.241.43","port": "50431"}]},"syslog_drain_url": null,"volume_mounts": []}]}
}
{"VCAP_APPLICATION": {"cf_api": "https://api.cf.eu10.hana.ondemand.com","limits": {"fds": 16384,"mem": 56,"disk": 1024},"application_name": "jerry demo server","application_uris": ["jerry-demo-server.cfapps.eu10.hana.ondemand.com"],"name": "jerry demo server","space_name": "dev","space_id": "3c737cf5-81eb-4da4-852c-d08739c74def","uris": ["jerry-demo-server.cfapps.eu10.hana.ondemand.com"],"users": null,"application_id": "cfa18882-e702-4f9b-a773-ce6e6de385fd","version": "374967a5-b7b9-4c59-802a-4c5f737ad95f","application_version": "374967a5-b7b9-4c59-802a-4c5f737ad95f"}
}

或者是使用下面这段代码，直接把部署到CloudFoundry上应用的process.env环境变量打印出来：

var app = require('express')();
var server = require('http').Server(app);
var io = require('socket.io')(server);server.listen(8080);function print_env(){console.log(process.env);
}app.get('/', function (req, res) {print_env();// res.sendFile(__dirname + '/index.html');var response = JSON.stringify(process.env);res.send(response);
});io.on('connection', function (socket) {console.log("connect comming from client: " + socket.id);socket.emit('messages_jerry', { hello: 'world greeting from Server!' });socket.on('messages', function (data) {console.log("data received from Client:" + JSON.stringify(data,2,2));});
});

同样能达到效果：
Tree
Chart
JSON Input

{
"CF_INSTANCE_ADDR": "10.0.75.23:61004",
"LANG": "en_US.UTF-8",
"OLDPWD": "/home/vcap",
"NODE_PATH": "/home/vcap/app/node_modules",
"CF_INSTANCE_PORT": "61004",
"NODE_HOME": "/home/vcap/deps/0/node",
"VCAP_APPLICATION": "{"application_id":"cfa18882-e702-4f9b-a773-ce6e6de385fd","application_name":"jerry demo server","application_uris":["jerry-demo-server.cfapps.eu10.hana.ondemand.com"],"application_version":"6dc4f14f-f01e-4af0-a1b9-aa4b5ff94b72","cf_api":"https://api.cf.eu10.hana.ondemand.com","host":"0.0.0.0","instance_id":"0cfa6559-cf9a-4ce1-4897-1f70","instance_index":0,"limits":{"disk":1024,"fds":16384,"mem":56},"name":"jerry demo server","port":8080,"space_id":"3c737cf5-81eb-4da4-852c-d08739c74def","space_name":"dev","uris":["jerry-demo-server.cfapps.eu10.hana.ondemand.com"],"version":"6dc4f14f-f01e-4af0-a1b9-aa4b5ff94b72"}",
"NODE_ENV": "production",
"MEMORY_LIMIT": "56m",
"WEB_MEMORY": "512",
"USER": "vcap",
"CF_INSTANCE_INTERNAL_IP": "10.159.133.212",
"VCAP_APP_PORT": "8080",
"PWD": "/home/vcap/app",
"HOME": "/home/vcap/app",
"CF_INSTANCE_KEY": "/etc/cf-instance-credentials/instance.key",
"PORT": "8080",
"TMPDIR": "/home/vcap/tmp",
"MEMORY_AVAILABLE": "56",
"DEPS_DIR": "/home/vcap/deps",
"CF_INSTANCE_GUID": "0cfa6559-cf9a-4ce1-4897-1f70",
"CF_INSTANCE_PORTS": "[{"external":61004,"internal":8080}]",
"CF_SYSTEM_CERT_PATH": "/etc/cf-system-certificates",
"CF_INSTANCE_IP": "10.0.75.23",
"INSTANCE_INDEX": "0",
"WEB_CONCURRENCY": "1",
"CF_INSTANCE_INDEX": "0",
"SHLVL": "1",
"INSTANCE_GUID": "0cfa6559-cf9a-4ce1-4897-1f70",
"VCAP_SERVICES": "{"redis":[{"label": "redis","provider": null,"plan": "v3.0-dev","name": "jerryredis","tags": ["redis","keyvalue"],"instance_name": "jerryredis","binding_name": null,"credentials": {"hostname": "10.11.241.43","ports": {"6379/tcp": "50431"},"port": "50431","password": "IF5X3bKPRt7Mu4Lk","end_points": [{"network_id": "SF","host": "10.11.241.43","port": "50431"}]},"syslog_drain_url": null,"volume_mounts": []
}]}",
"CREDHUB_API": "https://credhub.service.cf.internal",
"VCAP_APP_HOST": "0.0.0.0",
"PATH": "/home/vcap/deps/0/bin:/usr/local/bin:/usr/bin:/bin:/home/vcap/app/bin:/home/vcap/app/node_modules/.bin",
"CF_INSTANCE_CERT": "/etc/cf-instance-credentials/instance.crt",
"_": "/home/vcap/deps/0/bin/node"
}

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