Mongodb的启动和停止

1、Mongod的启动

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1.1、Mongod的启动选项

    Mongod有许多可配置的选项，在命令行运行mongod --help可以查看所有选项，常用的选项如下：

    示例1：查看进程

[root@gflinux102 data]# ps -ef|grep -v grep |grep mongod

root      3620  2132  0 14:05 pts/1    00:00:00 mongod --port 10001 --dbpath /opt/mongo/data/ --logpath /opt/mongo/logs/MongoDB.log

[root@gflinux102 data]# cat mongod.lock 

3620

[root@gflinux102 data]#

    示例二：查看端口号

[root@gflinux102 data]# netstat -ntlp|grep 27017

[root@gflinux102 data]# netstat -ntlp|grep 10001

tcp        0      0 0.0.0.0:10001               0.0.0.0:*                   LISTEN      3620/mongod         

[root@gflinux102 data]# 

root@gflinux102 logs]# more mongodb.log 

2015-02-10T14:05:14.531+0800 [initandlisten] MongoDB starting : pid=3620 port=10001 dbpath=/opt/mongo/data/ 32-bit host=gflinux102

2015-02-10T14:05:14.531+0800 [initandlisten] 

2015-02-10T14:05:14.531+0800 [initandlisten] ** NOTE: This is a 32 bit MongoDB binary.

2015-02-10T14:05:14.531+0800 [initandlisten] **       32 bit builds are limited to less than 2GB of data (or less with --journal).

2015-02-10T14:05:14.531+0800 [initandlisten] **       Note that journaling defaults to off for 32 bit and is currently off.

2015-02-10T14:05:14.531+0800 [initandlisten] **       See http://dochub.mongodb.org/core/32bit

    启动示例：

[root@gflinux102 bin]# mongod --port 10001 --dbpath /opt/mongo/data/ --logpath /opt/mongo/logs/mongodb.log

2015-02-10T14:05:14.516+0800 

2015-02-10T14:05:14.517+0800 warning: 32-bit servers don't have journaling enabled by default. Please use --journal if you want durability.

2015-02-10T14:05:14.517+0800 

    在32bit下，mongod只能处理2Gb的数据，注意生产中要使用64bit的机器。

1.2MongoDB的配置文件

    MongoDB支持从文件获取配置信息。当需要的配置非常多或者要自动化运维时，就会用到这个，指定配置文件可以用-f或者--config选项。

[root@gflinux102 logs]# mongod --help|grep "  -f"

  -f [ --config ] arg         configuration file specifying additional options

[root@gflinux102 logs]# 

    示例：

mongod --config ~/.mongodb.conf

    配置文件模板如下，注意这个是手工编辑的：

[root@gflinux102 bin]# mongod -f /opt/mongo/data/mongod.conf

2015-02-10T15:06:28.199+0800 

2015-02-10T15:06:28.200+0800 warning: 32-bit servers don't have journaling enabled by default. Please use --journal if you want durability.

2015-02-10T15:06:28.200+0800 

about to fork child process, waiting until server is ready for connections.

forked process: 3854

child process started successfully, parent exiting

[root@gflinux102 data]# vi mongod.conf

   注意：命令行中哪些如--fork的开关选项，其值要设为true。

1.3、停止MongoDB

1.3.1前台进程运行在中断

    如果服务器进程作为前台进程运行在终端，直接CTL-C。

1.3.2kill杀死

[root@gflinux102 bin]# ps -ef|grep -v grep |grep mongod

root      3854     1  0 15:06 ?        00:00:00 mongod -f /opt/mongo/data/mongod.conf

或者这样查看pid：

[root@gflinux102 bin]# cat /opt/mongo/data/mongod.lock

3854

    杀死进程：

[root@gflinux102 bin]# kill `cat /opt/mongo/data/mongod.lock` （SIGTERM）

[root@gflinux102 bin]# kill -2 `cat /opt/mongo/data/mongod.lock` （SIGINT）

    当mongod收到SIGINT或者SIGTERM时，会稳妥退出，即会等到当前运行的操作或者文件预分配完成（需要一些时间），关闭所有打开的连接，将缓存的数据刷新到磁盘，最后停止。

    【禁止】：千万不要向运行中的mongodb发送SIGKILL（kill -9），这样会导致数据库直接关闭，可能会使数据文件损坏。

1.3.3使用shutdown命令

    使用shutdown命令，{"shutdown":1}。这要在admin数据库下使用，shell提供了辅助函数，来简化这一过程。

[root@gflinux102 bin]# mongo localhost:10001

MongoDB shell version: 2.6.6

connecting to: localhost:10001/test

Server has startup warnings: 

2015-02-10T15:37:43.973+0800 [initandlisten] 

2015-02-10T15:37:43.973+0800 [initandlisten] ** NOTE: This is a 32 bit MongoDB binary.

2015-02-10T15:37:43.973+0800 [initandlisten] **       32 bit builds are limited to less than 2GB of data (or less with --journal).

2015-02-10T15:37:43.973+0800 [initandlisten] **       Note that journaling defaults to off for 32 bit and is currently off.

2015-02-10T15:37:43.973+0800 [initandlisten] **       See http://dochub.mongodb.org/core/32bit

2015-02-10T15:37:43.973+0800 [initandlisten] 

> show dbs

admin  (empty)

local  0.078GB

> use admin

switched to db admin

> db.shutdownServer()

2015-02-10T15:39:04.616+0800 DBClientCursor::init call() failed

server should be down...

2015-02-10T15:39:04.624+0800 trying reconnect to localhost:10001 (127.0.0.1) failed

2015-02-10T15:39:04.626+0800 warning: Failed to connect to 127.0.0.1:10001, reason: errno:111 Connection refused

2015-02-10T15:39:04.627+0800 reconnect localhost:10001 (127.0.0.1) failed failed couldn't connect to server localhost:10001 (127.0.0.1), connection attempt failed