MongoDB 安装篇

> 1、基础环境
    
    1. CentOS 6.8 x64
    2. libcurl-7.19.7-53.el6_9.x86_64
    3. openssl-1.0.1e-57.el6.x86_64 
    
> 2、依赖安装 libcurl openssl

```
yum install libcurl openssl
```

> 3、下载Mongodb源码包、解压

```
wget -c https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.6.12.tgz

mkdir /usr/local/mongodb
tar -zxvf mongodb-linux-x86_64-3.6.12.tgz -C  /usr/local/
cd /usr/local/
mv mongodb-linux-x86_64-3.6.12/ mongodb

```
> 4、添加环境变量

```
vim /etc/profile
#下面代码加入文件末尾
export PATH=$PATH:/usr/local/mongodb/bin

#立刻生效
source /etc/profile

#查看版本
mongod --version
db version v3.6.12
git version: c2b9acad0248ca06b14ef1640734b5d0595b55f1
allocator: tcmalloc
modules: none
build environment:
    distarch: x86_64
    target_arch: x86_64

```
> 5、创建目录

```
分别创建 数据/日志/配置 运行目录
mkdir -p /home/mongodb/{data,log,conf}
mkdir -p /var/run/mongodb
```
> 配置 mongodb
- [x] 一般咱们用 mongod -f xx.conf 启动

```
vi /home/mongodb/conf/mongod.conf
```

```
# for documentation of all options, see:
# http://docs.mongodb.org/manual/reference/configuration-options/

# where to write logging data.
systemLog:
  destination: file
  logAppend: true
  path: /home/mongodb/mongod.log

# Where and how to store data.
storage:
  dbPath: /home/mongodb/data
  journal:
    enabled: true
#  engine:
#  mmapv1:
#  wiredTiger:

# how the process runs
processManagement:
  fork: true  # fork and run in background
  pidFilePath: /var/run/mongodb/mongod.pid  # location of pidfile
  timeZoneInfo: /usr/share/zoneinfo

# network interfaces
net:
  port: 27017
  bindIp: 0.0.0.0  # Listen to local interface only, comment to listen on all interfaces.

#security:

#operationProfiling:

#replication:

#sharding:

## Enterprise-Only Options

#auditLog:

#snmp:

setParameter:
  failIndexKeyTooLong: false
  
```

> 6、创建 mongodb 用户

```
useradd mongodb -M -s /sbin/nologin
chown -R mongodb.mongodb /usr/local/mongodb
chown -R mongodb.mongodb /var/run/mongodb

```

> 7、启动脚本

```
vi /etc/init.d/mongod
```

```
#!/bin/sh
#
# mongodb      init file for starting up the MongoDB server
#
# chkconfig:   - 90 10
# description: Starts and stops the MongDB daemon that handles all \
#              database requests.

# Source function library.
. /etc/rc.d/init.d/functions

exec="/usr/local/mongodb/bin/mongod"
prog="mongod"
logfile="/home/mongodb/log/mongodb.log"

[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog
OPTIONS="--quiet -f /home/mongodb/conf/mongod.conf"
pidfile=${PIDFILE-/var/run/mongodb/mongod.pid}
options="$MONGODB_OPTIONS $OPTIONS"
lockfile="/var/lock/subsys/mongod"

# Nicer version of killproc that does not kill mongodb when it takes
# a long time to shut down and does not hang for a long time when mongo
# shuts down quickly
killproc_nice() {
    local RC base pid pid_file= delay i

RC=0; delay=3
    # Test syntax.
    if [ "$#" -eq 0 ]; then
        echo $"Usage: killproc [-p pidfile] [ -d delay] {program} [-signal]"
        return 1
    fi
    if [ "$1" = "-p" ]; then
        pid_file=$2
        shift 2
    fi
    if [ "$1" = "-d" ]; then
        delay=$2
        shift 2
    fi

# Save basename.
    base=${1##*/}

# Find pid.
    __pids_var_run "$1" "$pid_file"
    RC=$?
    if [ -z "$pid" ]; then
        if [ -z "$pid_file" ]; then
            pid="$(__pids_pidof "$1")"
        else
            [ "$RC" = "4" ] && { failure $"$base shutdown" ; return $RC ;}
        fi
    fi

# Kill it.
    if [ -n "$pid" ] ; then
        [ "$BOOTUP" = "verbose" -a -z "${LSB:-}" ] && echo -n "$base "
        if checkpid $pid 2>&1; then
            # TERM first, then KILL if not dead
            kill -TERM $pid >/dev/null 2>&1
            usleep 100000

# Check every one second if the program is stopped.
            # Do so for a maximum of $delay seconds
            for ((i = 0 ; i < $delay; i++))
            do
                if checkpid $pid; then
                    sleep 1
                else
                    break
                fi
            done

# If the program is not stopped, kill it
            if checkpid $pid ; then
                kill -KILL $pid >/dev/null 2>&1
                usleep 100000
            fi
        fi
        checkpid $pid
        RC=$?
        [ "$RC" -eq 0 ] && failure $"$base shutdown" || success $"$base shutdown"
        RC=$((! $RC))
    else
        failure $"$base shutdown"
        RC=0
    fi

# Remove pid file if any.
    rm -f "${pid_file:-/var/run/$base.pid}"
    return $RC
}

start() {
    [ -x $exec ] || exit 5
    echo -n $"Starting $prog: "
    daemon --pidfile=${pidfile} --user mongodb "$exec $options run >> $logfile 2>&1"
    retval=$?
    echo
    [ $retval -eq 0 ] && touch $lockfile
    return $retval
}

stop() {
    echo -n $"Stopping $prog: "
    killproc_nice -p ${pidfile} -d 300 $prog
    retval=$?
    echo
    [ $retval -eq 0 ] && rm -f $lockfile
    return $retval
}

restart() {
    stop
    start
}

reload() {
    restart
}

force_reload() {
    restart
}

rh_status() {
    # run checks to determine if the service is running or use generic status
    status -p ${pidfile} $prog
}

rh_status_q() {
    rh_status >/dev/null 2>&1
}

case "$1" in
    start)
        rh_status_q && exit 0
        $1
        ;;
    stop)
        rh_status_q || exit 0
        $1
        ;;
    restart)
        $1
        ;;
    reload)
        rh_status_q || exit 7
        $1
        ;;
    force-reload)
        force_reload
        ;;
    status)
        rh_status
        ;;
    condrestart|try-restart)
        rh_status_q || exit 0
        restart
        ;;
    *)
        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
        exit 2
esac
exit $?

```

```
# 给予可执行权限

chmod a+x /etc/init.d/mongod

#注意权限问题：
    1. mongodb 的 data log pid 存放 确保有权限
    2. 比如登陆用户为root，此时手动启动了mongodb 生成的 sock 则属于root ，你使用 etc/init.d/mongod start 的时候则会则没有操作权限，删除即可
    3. 查看详细的错误 OPTIONS="--quiet -f /home/mongodb/conf/mongod.conf  --fork --logpath=/home/mongodb/log/mongodb.log" ，进一步排查

```
> 开机启动(centos6.8)

```
chkconfig --add mongod
chkconfig mongod on
```