无法在ubuntu上运行Mongodb

Question

尝试访问mongodb时，出现连接失败的错误

1. 在运行我得到的mongod命令时

   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] MongoDB 
   starting : pid=2580 port=27017 dbpath=/data/db 64-bit host=gten
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] db version 
   v3.6.3
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] git 
   version: 9586e557d54ef70f9ca4b43c26892cd55257e1a5
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] OpenSSL 
   version: OpenSSL 1.1.0g  2 Nov 2017
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] allocator: 
   tcmalloc
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] modules: 
   none
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] build 
   environment:
   2019-02-25T11:05:05.871+0530 I CONTROL  [initandlisten]     
   distarch: x86_64
   2019-02-25T11:05:05.871+0530 I CONTROL  [initandlisten]     
   target_arch: x86_64
   2019-02-25T11:05:05.871+0530 I CONTROL  [initandlisten] options: 
   {}
   2019-02-25T11:05:05.962+0530 I STORAGE  [initandlisten] exception 
   in initAndListen: IllegalOperation: Attempted to create a lock 
   file on a read-only directory: /data/db, terminating
   2019-02-25T11:05:05.962+0530 I CONTROL  [initandlisten] now 
   exiting
   2019-02-25T11:05:05.962+0530 I CONTROL  [initandlisten] shutting 
   down with code:100
   

当我运行mongo命令时，我得到了

MongoDB shell version v4.0.6
connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
2019-02-25T11:16:44.802+0530 E QUERY    [js] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection refused :
connect@src/mongo/shell/mongo.js:343:13
@(connect):1:6
exception: connect failed

我不知道我遇到了[https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/]和[https://www.howtoforge.com/tutorial/install-mongodb-on-ubuntu-16.04/] 安装mongo。

配置： 我正在使用UBUNTU 18.04。 感谢您的帮助，我已经回答了很多问题，并尝试了所有问题，但仍然面临同样的问题。谢谢

做了很多事情后，我得到了

2019-02-25T18:52:27.197+0530 I CONTROL  [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] MongoDB starting : pid=27390 port=27017 dbpath=/data/db 64-bit host=gten
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] db version v4.0.6
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] git version: caa42a1f75a56c7643d0b68d3880444375ec42e3
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.1.0g  2 Nov 2017
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] allocator: tcmalloc
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] modules: none
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] build environment:
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten]     distmod: ubuntu1804
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten]     distarch: x86_64
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten]     target_arch: x86_64
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] options: {}
2019-02-25T18:52:27.200+0530 E STORAGE  [initandlisten] Failed to set up listener: SocketException: Address already in use
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] now exiting
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] shutting down with code:48

Answer 1

根据错误，尝试启动mongod进程的用户没有对/ data / db文件夹的写访问权。

运行以下命令以使用户能够写入/ data / db文件夹

sudo chown -R $USER:$USER /data/db

或使用当前用户权限创建一个新文件夹，并使用--dbpath选项启动mongod

mkdir mydata/db

mongod --dbpath mydata/db

Answer 2

如果您遇到此问题，则意味着您尝试连接mongo 在本地运行服务器会出现此问题

某些系统在计算机启动时未自动运行mongo服务。 因此，您需要手动启动它。

每次启动计算机或使用mongo时，运行此命令即可运行服务

sudo service mongod start
// or 
sudo systemctl start mongod

运行sudo service mongod status并查看返回的内容。 如果停止了   运行sudo service mongod start以启动mongodb并尝试连接到它。

如果sudo service mongod start输入错误，则

使用以下内容创建文件/lib/systemd/system/mongod.service：

[Unit]
Description=High-performance, schema-free document-oriented database
After=network.target

[Service]
User=mongodb
ExecStart=/usr/bin/mongod --quiet --config /etc/mongod.conf

[Install]
WantedBy=multi-user.target

如果仍然存在错误，请共享控制台错误。一开始，我们可能会为您提供更好的帮助。

Answer 3

尝试这个。这可能会有帮助。

sudo chmod 777 /data/db