本地MongoDB服务器连接失败问题求助（附错误日志）

Hey there, let's work through this MongoDB connection issue together. First, let's confirm the exact error you're hitting:

MongoDB shell version v3.6.4 connecting to: mongodb://127.0.0.1:27017
2018-05-07T21:34:02.181+0545 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017 after 5000ms milliseconds, giving up.
2018-05-07T21:34:02.181+0545 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:251:13
@(connect):1:6
exception: connect failed

Here are some troubleshooting steps you can try, ordered by how likely they are to fix the problem:

• Check if the MongoDB service is running

  • On Windows: Open services.msc (press Win+R, type it in), look for the MongoDB service. If it's not running, right-click and select "Start". You can also run net start MongoDB in Command Prompt as admin.
  • On macOS/Linux: Run systemctl status mongod in the terminal. If it shows inactive, start it with sudo systemctl start mongod. For older systems, use sudo service mongod start.

• Verify port 27017 isn't being used by another program

  • On Windows: Run netstat -ano | findstr :27017 to see which process is using the port. Note the PID, then open Task Manager, go to the Details tab, find the PID, and end the process if it's not MongoDB.
  • On macOS/Linux: Use sudo lsof -i :27017 or sudo netstat -tulpn | grep 27017 to find the conflicting process, then kill it with sudo kill <PID>.

• Check MongoDB's bind IP configuration

  • Open your mongod configuration file (usually located at /etc/mongod.conf on Linux/macOS, or C:\Program Files\MongoDB\Server\3.6\bin\mongod.cfg on Windows).
  • Look for the bindIp setting. Make sure it's set to 127.0.0.1 (for local-only connections) or 0.0.0.0 (to allow all connections). If it's set to a different IP, your local shell won't be able to connect. After modifying, restart the MongoDB service.

• Inspect MongoDB's startup logs for issues

  • Log files are typically at /var/log/mongodb/mongod.log (Linux/macOS) or C:\Program Files\MongoDB\Server\3.6\log\mongod.log (Windows).
  • Look for errors like permission denied (the MongoDB user can't access the data directory) or corrupted data files. Fix those issues first, then restart the service.

• Try connecting with localhost instead of 127.0.0.1

  • Sometimes there's a subtle difference in how systems resolve these addresses. Run mongo --host localhost --port 27017 and see if that works.

• Check your local firewall settings

  • Your firewall might be blocking incoming connections to port 27017. Temporarily disable the firewall and try connecting again. If it works, add an exception for MongoDB or port 27017 in your firewall rules.

If none of these steps work, share what you've already tried and extra details like your OS, MongoDB data directory permissions, or recent setup changes, and we can dig deeper.

内容的提问来源于stack exchange，提问作者dipesh