General options:
  --dbpath arg  directory for datafiles    #指定数据存放目录
  --quiet     quieter output   #静默模式
  --logpath arg   file to send all output to instead of stdout   #指定日志存放目录
  --logappend   appnd to logpath instead of over-writing  #指定日志是以追加还是以覆盖的方式写入日志文件
  --fork     fork server process   #以创建子进程的方式运行
  --cpu      periodically show cpu and iowait utilization  #周期性的显示cpu和io的使用情况
  --noauth     run without security  #无认证模式运行
  --auth      run with security  #认证模式运行
  --objcheck     inspect client data for validity on receipt  #检查客户端输入数据的有效性检查
  --quota                   enable db quota management   #开始数据库配额的管理
  --quotaFiles arg          number of files allower per db, requires --quota  #规定每个数据库允许的文件数
  --nocursors               diagnostic/debugging option  #调试诊断选项
  --nohints      ignore query hints  #忽略查询命中率
  --nohttpinterface    disable http interface  #关闭http接口，默认是28017
  --noscripting             disable scripting engine  #关闭脚本引擎
  --noprealloc              disable data file preallocation  #关闭数据库文件大小预分配
  --smallfiles              use a smaller default file size  #使用较小的默认文件大小
  --nssize arg (=16)        .ns file size (in MB) for new databases #新数据库ns文件的默认大小
  --diaglog arg             0=off 1=W 2=R 3=both 7=W+some reads #提供的方式，是只读，只写，还是读写都行，还是主要写+部分的读模式
  --sysinfo                 print some diagnostic system information #打印系统诊断信息
  --upgrade                 upgrade db if needed  #如果需要就更新数据库
  --repair                  run repair on all dbs  #修复所有的数据库
  --notablescan    do not allow table scans  #不运行表扫描
  --syncdelay arg (=60)     seconds between disk syncs (0 for never)  #系统同步刷新磁盘的时间，默认是60s

Replication options:
  --master    master mode #主复制模式
  --slave    slave mode  #从复制模式
  --source arg          when slave: specify master as <server:port> #当为从时，指定主的地址和端口
  --only arg            when slave: specify a single database to replicate #当为从时，指定需要从主复制的单一库
  --arbiter arg         address of arbiter server  #仲裁服务器，在主主中和pair中用到
  --autoresync          automatically resync if slave data is stale #自动同步从的数据
  --oplogSize arg       size limit (in MB) for op log #指定操作日志的大小
  --opIdMem arg         size limit (in bytes) for in memory storage of op ids #指定存储操作日志的内存大小

Sharding options:
  --configsvr           declare this is a config db of a cluster #指定shard中的配置服务器
  --shardsvr            declare this is a shard db of a cluster #指定shard服务器

# mongod.conf

# Where to store the data.

# Note: if you run mongodb as a non-root user (recommended) you may
# need to create and set permissions for this directory manually,
# e.g., if the parent directory isn't mutable by the mongodb user.
dbpath=/opt/mongodb/data

# Where to log
logpath=/opt/mongodb/log/mongodb.log

logappend=true

# The pid file
pidfilepath=/opt/mongodb/run/mongod.pid

# The port number
port = 27017

# Fork server process
fork=true

# Disables write-ahead journaling
#nojournal = true

# Enables periodic logging of CPU utilization and I/O wait
#cpu = true

# Turn on/off security.  Off is currently the default
#noauth = true
#auth = true

# Verbose logging output.
#verbose = true

# Inspect all client data for validity on receipt (useful for
# developing drivers)
#objcheck = true

# Enable db quota management
#quota = true

# Set oplogging level where n is
#   0=off (default)
#   1=W
#   2=R
#   3=both
#   7=W+some reads
#diaglog = 0

# Ignore query hints
#nohints = true

# Disable the HTTP interface (Defaults to localhost:27018).
#nohttpinterface = true

# Turns off server-side scripting.  This will result in greatly limited
# functionality
#noscripting = true

# Turns off table scans. Any query that would do a table scan fails.
#notablescan = true

# Disable data file preallocation.
#noprealloc = true

# Specify .ns file size for new databases.
# nssize = <size>

# Accout token for Mongo monitoring server.
#mms-token = <token>

# Server name for Mongo monitoring server.
#mms-name = <server-name>

# Ping interval for Mongo monitoring server.
#mms-interval = <seconds>

# Replication Options

# In master/slave replicated mongo databases, specify here whether
# This is a slave or master
#slave = true
#source = master.example.com
# Slave only: specify a single database to replicate
#only = master.example.com
# or
#master = true
#source = slave.example.com

# In replica set configuration, specify the name of the replica set
#replSet = setname

#!/bin/sh

HOME="/opt/mongodb"
PATH="$HOME/bin:$PATH"
EXEC="$HOME/bin/mongod"
CLIEXEC="$HOME/bin/mongo"
CONF="$HOME/etc/mongod.conf"
PIDFILE="/opt/mongodb/run/mongod.pid"

case "$1" in
    start)
        if [ -f $$PIDFILE ]
        then
                echo "$PIDFILE exists, process is already running or crashed."
        else
                echo "Starting MongoDB server..."
                $EXEC --config $CONF
        fi
        ;;
    stop)
        if [ ! -f $PIDFILE ]
        then
                echo "$PIDFILE does not exist, process is not running."
        else
                PID=$(cat $PIDFILE)
                echo "Stopping ..."
                $CLIEXEC admin --eval "db.shutdownServer()"
                while [ -x /proc/${PID} ]
                do
                    echo "Waiting for MongoDB to shutdown ..."
                    sleep 1
                done
                echo "MongoDB stopped."
        fi
        ;;
    *)
        echo "Usage: $0 {start|stop}" >&2
        exit 1
        ;;
esac