系列文章原载于自己的博客，TOPI.CO (http://topi.co) ，某天不小心就 push 错啦，懒得从头再来，上传到 Ruby-China 来，一是方便自己回顾，另外也方便跟我一样的初学者

###Ubuntu 环境下安装

Ubuntu 环境下比较容易安装，可参考：

Ubuntu and Debian packages

安装好后会自动配置。

###CentOS 环境下安装

####安装 MongoDB

#####(1) 查看系统位数

getconf LONG_BIT

#####(2) 编辑 MongoDB 的安装源

vi /etc/yum.repos.d/10gen.repo

#####(3) 粘贴以下内容

64 位适用：

[10gen]
name=10gen Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64
gpgcheck=0

32 位适用：

[10gen]
name=10gen Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/i686
gpgcheck=0

#####(4) 安装 mongo-10gen 和 mongo-10-gen-server

yum install mongo-10gen mongo-10gen-server

#####(5) 设置 mongoDB 自动启动服务

cp /etc/init.d/mongod /etc/rc.d/init.d/mongod
ln -s /etc/init.d/mongod /etc/rc.d/rc3.d/S25mongod && ln -s /etc/init.d/mongod /etc/rc.d/rc5.d/S25mongod
chkconfig —add mongod

####自动启动脚本

#!/bin/bash
# mongod - Startup script for mongod
# chkconfig: 35 85 15
# description: Mongo is a scalable, document-oriented database.
# processname: mongod
# config: /etc/mongod.conf
# pidfile: /var/run/mongo/mongo.pid

. /etc/rc.d/init.d/functions

# things from mongod.conf get there by mongod reading it

OPTIONS=" -f /etc/mongod.conf"
SYSCONFIG="/etc/sysconfig/mongod"

mongod=${MONGOD-/usr/bin/mongod}

MONGO_USER=mongod
MONGO_GROUP=mongod
. "$SYSCONFIG" || true
start()
{
  echo -n $"Starting mongod: "
  daemon —user "$MONGO_USER" $mongod $OPTIONS
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && touch /var/lock/subsys/mongod
}

stop()
{
  echo -n $"Stopping mongod: "
  killproc -p /var/lib/mongo/mongod.lock -t30 -TERM /usr/bin/mongod
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/mongod
}

restart () {
        stop
        start
}

ulimit -n 12000
RETVAL=0

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  restart|reload|force-reload)
    restart
    ;;
  condrestart)
    [ -f /var/lock/subsys/mongod ] && restart || :
    ;;
  status)
    status $mongod
    RETVAL=$?
    ;;
  *)
    echo "Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart}"
    RETVAL=1
esac

exit $RETVAL