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MongoDB MongoDB 修改数据库保存位置无法启动？

OrderSun · March 20, 2018 · Last by OrderSun replied at March 20, 2018 · 10815 hits

环境 ubuntu16.04，项目使用 mongodb，由于数据量较大，想把数据库保存到其他目录，修改如下：

默认的数据存储目录是/var/lib/mongodb，假设我们的目的路径是/home/mongodb。

关闭数据库：

sudo service mongod stop

在配置文件中将 storage.dbPath 项设置为目的路径，修改后如下：

storage：
  dbPath: /home/mongodb

将原目录下的文件复制到新目录中：

sudo cp -r /var/lib/mongodb/* /home/mongodb/

将 mongod.lock 文件删除后启动数据库：

sudo rm /home/mongodb/mongod.lock
sudo service mongod start

看起来一切都是那么美好~~~~

查看启动状态：

sudo service mongod status

● mongod.service - High-performance, schema-free document-oriented database
   Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2018-03-20 09:35:41 CST; 4s ago
     Docs: https://docs.mongodb.org/manual
  Process: 17283 ExecStart=/usr/bin/mongod --config /etc/mongod.conf (code=exited, status=100)
 Main PID: 17283 (code=exited, status=100)

Mar 20 09:35:41 smart systemd[1]: Started High-performance, schema-free document-oriented database.
Mar 20 09:35:41 smart systemd[1]: mongod.service: Main process exited, code=exited, status=100/n/a
Mar 20 09:35:41 smart systemd[1]: mongod.service: Unit entered failed state.
Mar 20 09:35:41 smart systemd[1]: mongod.service: Failed with result 'exit-code'.

那么问题来了，为什么会启动失败呢？ 通过查询日志文件得知：

Attempted to create a lock file on a read-only directory: /home/mongodb, terminating

查看/home/mongodb的权限

drwxr-xr-x 4 root root 4.0K Mar 20 10:55 mongodb

这里的文件所属者不正确，mongodb这个目录的所有者必须是 mongodb，使用以下命令修改

# /home
sudo chown -R mongodb:mongodb *

修改后权限为

drwxr-xr-x 4 mongodb mongodb 4.0K Mar 20 10:55 mongodb

重启服务，大功告成。

huacnlee #1 March 20, 2018

直接执行 mongod --config /etc/mongod.conf 看错误日志

如果配置里面错误日志没有直接输出，请阅读 /etc/mongod.conf 找到日志文件，就可以找到错误原因。

OrderSun #2 March 20, 2018
Reply to huacnlee

执行这个没有反应，卡住不动。

huacnlee #3 March 20, 2018
Reply to OrderSun

看我第二句...

OrderSun #4 March 20, 2018
Reply to huacnlee

日志内容是这样的，没看出来哪里出错了，请指教🙏 

2018-03-20T10:09:21.433+0800 I CONTROL  [main] ***** SERVER RESTARTED *****
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten] MongoDB starting : pid=17726 port=27017 dbpath=/home/mongodb 64-bit host=smart
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten] db version v3.4.13
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten] git version: fbdef2ccc53e0fcc9afb570063633d992b2aae42
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten] allocator: tcmalloc
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten] modules: none
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten] build environment:
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten]     distmod: ubuntu1604
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten]     distarch: x86_64
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten]     target_arch: x86_64
2018-03-20T10:09:21.436+0800 I CONTROL  [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1", port: 27017 }, storage: { dbPath: "/home/mongodb", journal: { enabled: true } }, systemLog: { destination: "file", logAppend: true, path: "/var/log/mongodb/mongod.log" } }
2018-03-20T10:09:21.460+0800 I -        [initandlisten] Detected data files in /home/sunyudong/database/mongodb created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2018-03-20T10:09:21.460+0800 I STORAGE  [initandlisten]
2018-03-20T10:09:21.460+0800 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2018-03-20T10:09:21.460+0800 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2018-03-20T10:09:21.460+0800 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=3406M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),verbose=(recovery_progress),
2018-03-20T10:09:21.674+0800 I STORAGE  [initandlisten] WiredTiger message [1521511761:674256][17726:0x7f4c98877d00], txn-recover: Main recovery loop: starting at 11/5632
2018-03-20T10:09:21.760+0800 I STORAGE  [initandlisten] WiredTiger message [1521511761:760006][17726:0x7f4c98877d00], txn-recover: Recovering log 11 through 12
2018-03-20T10:09:21.857+0800 I STORAGE  [initandlisten] WiredTiger message [1521511761:857612][17726:0x7f4c98877d00], txn-recover: Recovering log 12 through 12
2018-03-20T10:09:22.359+0800 I CONTROL  [initandlisten] 
2018-03-20T10:09:22.360+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-03-20T10:09:22.360+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2018-03-20T10:09:22.360+0800 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2018-03-20T10:09:22.360+0800 I CONTROL  [initandlisten]
2018-03-20T10:09:22.365+0800 I FTDC     [initandlisten] Initializing full-time diagnostic data capture with directory '/home/sunyudong/database/mongodb/diagnostic.data'
2018-03-20T10:09:22.366+0800 I NETWORK  [thread1] waiting for connections on port 27017
2018-03-20T10:10:48.106+0800 I CONTROL  [signalProcessingThread] got signal 2 (Interrupt), will terminate after current cmd ends
2018-03-20T10:10:48.106+0800 I NETWORK  [signalProcessingThread] shutdown: going to close listening sockets...
2018-03-20T10:10:48.107+0800 I NETWORK  [signalProcessingThread] closing listening socket: 7
2018-03-20T10:10:48.107+0800 I NETWORK  [signalProcessingThread] closing listening socket: 8
2018-03-20T10:10:48.107+0800 I NETWORK  [signalProcessingThread] removing socket file: /tmp/mongodb-27017.sock
2018-03-20T10:10:48.107+0800 I NETWORK  [signalProcessingThread] shutdown: going to flush diaglog...
2018-03-20T10:10:48.107+0800 I FTDC     [signalProcessingThread] Shutting down full-time diagnostic data capture
2018-03-20T10:10:48.112+0800 I STORAGE  [signalProcessingThread] WiredTigerKVEngine shutting down
2018-03-20T10:10:48.502+0800 I STORAGE  [signalProcessingThread] shutdown: removing fs lock...
2018-03-20T10:10:48.502+0800 I CONTROL  [signalProcessingThread] now exiting
2018-03-20T10:10:48.502+0800 I CONTROL  [signalProcessingThread] shutting down with code:0
huacnlee #5 March 20, 2018
Reply to OrderSun

你要用 sudo service mongod start 的方式启动，然后看那个日志文件。

这个明显是权限的问题，你直接执行 mongod --config /etc/mongod.conf 没问题，不代表 sudo service mongod start 也没问题，两种执行方式权限是不一样的。

OrderSun #6 March 20, 2018
Reply to huacnlee

多谢，搞定了，是文件权限问题，mongodb/这个目录的所有者必须是 mongodb，可以使用这个命令修复：

sudo chown -R mongodb:mongodb *

权限改成这样：

drwxr-xr-x 4 mongodb mongodb 4.0K Mar 20 10:55 mongodb
huacnlee closed this topic. 20 Mar 16:17
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