解决启动mongodb --fork报错 -ERROR: child process failed, exited with error number 1

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[wangshumin@CentOSNode1 bin]$ ./mongod --dbpath /home/wangshumin/path/database --logpath /home/wangshumin/path/log/mongod.log --fork --port 27017
about to fork child process, waiting until server is ready for connections.
forked process: 2919
child process started successfully, parent exiting
[wangshumin@CentOSNode1 bin]$ ./mongo
MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.6.3
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
http://docs.mongodb.org/
Questions? Try the support group
http://groups.google.com/group/mongodb-user
Server has startup warnings: 
2018-03-03T18:40:52.284+0800 I CONTROL  [initandlisten] 
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] 
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] ** WARNING: This server is bound to localhost.
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] **          Remote systems will be unable to connect to this server. 
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] **          Start the server with --bind_ip

to specify which IP 
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] **          addresses it should serve responses from, or with --bind_ip_all to
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] **          bind to all interfaces. If this behavior is desired, start the
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] **          server with --bind_ip 127.0.0.1 to disable this warning.
2018-03-03T18:40:52.285+0800 I CONTROL  [initandlisten] 
2018-03-03T18:40:52.307+0800 I CONTROL  [initandlisten] 
2018-03-03T18:40:52.307+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2018-03-03T18:40:52.307+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-03-03T18:40:52.308+0800 I CONTROL  [initandlisten] 
2018-03-03T18:40:52.308+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2018-03-03T18:40:52.308+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-03-03T18:40:52.308+0800 I CONTROL  [initandlisten] 
2018-03-03T18:40:52.308+0800 I CONTROL  [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 3821 processes, 65536 files. Number of processes should be at least 32768 : 0.5 times number of files.
2018-03-03T18:40:52.308+0800 I CONTROL  [initandlisten] 
> lll
2018-03-03T18:43:17.713+0800 E QUERY    [thread1] ReferenceError: lll is not defined :
@(shell):1:1
> 
> list
2018-03-03T18:43:22.520+0800 E QUERY    [thread1] ReferenceError: list is not defined :
@(shell):1:1
> show dbs;
admin   0.000GB
config  0.000GB
local   0.000GB
> db.createCollection(‘collectionName’)
2018-03-03T18:49:53.074+0800 E QUERY    [thread1] SyntaxError: illegal character @(shell):1:20
> use local
switched to db local
> show tables;
startup_log     

失败的原因是因为通过service mongodb restart时启动失败，或者如果是直接kill 掉来关闭都会出现这种情况

  是因为没有正常关闭导致的。

         那么如何正常关闭mongodb？
可以去看官方文档：
http://docs.mongodb.org/manual/tutorial/manage-mongodb-processes/

先通过shell连上服务器：
mongo
use admin
db.shutdownServer()

或者直接kill -15 ,注意kill -9 可能会导致数据文件损坏

那么处理这种要先删掉数据存放点里的mongodb.lock，和日志文件，在logpath的位置，全部删掉，然后再 mongod --repair -f /etc/mongod.conf

  是修复，但有可能还是不行，这时我采用了直接把数据考到另一个地方，然后通过/mongod --port 27017 --datapath /新的位置  --logpath /新的位置 --fork 这样就可以启动了

  我认为都是因为他记录了在log里，如果还是用原来的log很可能启动不了，一个新的log，没有记录出错的地方就可以启动，反正我认为只要删了lock文件，并指向到一个新的log目录，或者是删掉原来log目录里的所有文件就可以。启动不了主要是两个地方控治，一个就是mongod.lock,另一个就是log

   对了注意启动时logpath /home/mongodb/logs/mongod.log 这里是指向一个文件，而不是目录，如果不是指向文件也是启动不了

   而dbpath 指向的是一个目录