如何用shell寫(xiě)一個(gè)rsync網(wǎng)絡(luò)服務(wù)啟動(dòng)腳本？超級(jí)詳細(xì)！

首先在寫(xiě)腳本之前，你要知道關(guān)于rsync的理論知識(shí)與實(shí)操，才能寫(xiě)好一個(gè)ok的腳本。

我們先來(lái)捋一捋：

rsync的啟動(dòng)命令：

rsync --daemon

停止命令：

kill rsync進(jìn)程號(hào)

pkill rsync

killall rsync

話不多說(shuō)，上腳本：

#!/bin/bash
#####################################
#?File?Name:?rsyncd.sh
#?Version:?V1.0
#?Author:?wuhan
#?Created?Time?:?2018-10-14?13:19:53
#?Description:?rsync?service?script
#####################################

.?/etc/init.d/functions
#首先加載/etc/init.d/functions，待會(huì)我們需要用里面的基礎(chǔ)函數(shù)

lockfile="/var/lock/subsys/rsyncd"
#定義一個(gè)鎖文件的變量
rpfp="/var/run/rsyncd.pid"
#寫(xiě)一個(gè)rsync端口ID的變量，方便多次引用，可在此腳本中使用

#寫(xiě)一個(gè)函數(shù)，名為start
start(){
????#函數(shù)名
????rsync?--daemon?&&?>/dev/null
????#rsync服務(wù)啟動(dòng)命令，啟動(dòng)成功后輸出到空
????retval=$?
????#獲取返回值
????if?[?$retval?-eq?0?]
????#如果返回值等于0
????then
????#那么執(zhí)行如下操作
????????action?"rsync?startup?ok"?/bin/true
????????#用action函數(shù)輸出啟動(dòng)成功的內(nèi)容并顯示ok
????????touch?$lockfile
????????#在創(chuàng)建一個(gè)鎖文件
????????return?$retval
????????#返回使用啟動(dòng)命令后的返回值
????else
????#否則
????????action?"rsync?startup?fail"?/bin/false
????????#輸出服務(wù)啟動(dòng)失敗的內(nèi)為，顯示false
????????return?$retval
????????#也返回啟動(dòng)命令后的返回值，方便排錯(cuò)
????fi
????#退出
}

#寫(xiě)一個(gè)停止命令的函數(shù)，名為stop
stop(){
????if?test?-s?"$rpfp"
????#如果端口ID文件長(zhǎng)度不為0，那么為真，執(zhí)行如下操作
????then
????????rsyncd_pid=`cat?$rpfp`
????????#定義一個(gè)端口ID號(hào)的變量
????????if?(kill?-0?$rsyncd_pid?&>/dev/null)
????????#如果端口ID號(hào)存在，且輸出到空
????????then
????????#執(zhí)行如下操作
????????????kill?$rsyncd_pid
????????????#通過(guò)進(jìn)程號(hào)殺掉rsync服務(wù)
????????????retval=$?
????????????#獲取返回值
????????????if?[?$retval?-eq?0?]
????????????#如果返回值等于0，執(zhí)行如下指令
????????????then
????????????????action?"rsync?stop?ok"?/bin/true
????????????????#輸出服務(wù)停止成功，顯示ok
????????????????rm?-fr?$lockfile
????????????????#如果殺掉rsync服務(wù)，那就刪除鎖文件
????????????????return?"$retval"
????????????????#獲取返回值
????????????else
????????????#否則執(zhí)行如下操作
????????????????action?"rsync?stop?fail"?/bin/false
????????????????#輸出rsync停止失敗，顯示false
????????????????return?$retval
????????????????#獲得返回值
????????????fi
????????else
????????#否則
????????????echo?"rsyncd?process?is?not?exist."
????????????#提示rsync進(jìn)程不存在
????????????return?2
????????????#返回值2
????????fi
????else
????#否則
????????echo?"${rpfp}is?not?exist,or?rsync?does?not?startup"
????????#提示端口號(hào)不存在或rsync服務(wù)沒(méi)啟動(dòng)
????fi
????#結(jié)束
}

case?"$1"?in
#因?yàn)閷?xiě)了函數(shù)，所以我們這里用case結(jié)構(gòu)條件句更適合，定義$1為變量
????start)
????#匹配到start?執(zhí)行start函數(shù)并獲取返回值
????????start
????????retval=$?
????????;;
????stop)
????#匹配到stop?執(zhí)行stop函數(shù)并獲取返回值
????????stop
????????retval=$?
????????;;
????restart)
????#匹配到restart?先執(zhí)行stop函數(shù)休眠1s在執(zhí)行start實(shí)現(xiàn)restart，并獲取返回值
????????stop
????????sleep?1
????????start
????????retval=$?
????????;;
????*)
????#都沒(méi)有匹配到就輸出提示只能執(zhí)行三個(gè)函數(shù)中的一個(gè)
????????echo?"?usage:?$0?{start|stop|restart}?"
????????exit?1
esac
#結(jié)束
exit?$retval
#退出并取得返回值從而進(jìn)行判斷

試驗(yàn)：聰明的你可以看到PID進(jìn)程號(hào)在我們的停止開(kāi)啟和重啟之后更改，說(shuō)明腳本ok。

[root@node1?~]#?lsof?-i:873
COMMAND???PID?USER???FD???TYPE?DEVICE?SIZE/OFF?NODE?NAME
rsync???10044?root????4u??IPv4?639767??????0t0??TCP?*:rsync?(LISTEN)
rsync???10044?root????5u??IPv6?639768??????0t0??TCP?*:rsync?(LISTEN)
[root@node1?~]#?sh?/server/scripts/09/rsyncd3.sh?stop
rsync?stop?ok??????????????????????????????????????????????[??OK??]
[root@node1?~]#?lsof?-i:873
[root@node1?~]#?
[root@node1?~]#?sh?/server/scripts/09/rsyncd3.sh?start
rsync?startup?ok???????????????????????????????????????????[??OK??]
[root@node1?~]#?lsof?-i:873
COMMAND???PID?USER???FD???TYPE?DEVICE?SIZE/OFF?NODE?NAME
rsync???10212?root????4u??IPv4?664268??????0t0??TCP?*:rsync?(LISTEN)
rsync???10212?root????5u??IPv6?664269??????0t0??TCP?*:rsync?(LISTEN)
[root@node1?~]#?sh?/server/scripts/09/rsyncd3.sh?restart
rsync?stop?ok??????????????????????????????????????????????[??OK??]
rsync?startup?ok???????????????????????????????????????????[??OK??]
[root@node1?~]#?lsof?-i:873
COMMAND???PID?USER???FD???TYPE?DEVICE?SIZE/OFF?NODE?NAME
rsync???10227?root????4u??IPv4?664325??????0t0??TCP?*:rsync?(LISTEN)
rsync???10227?root????5u??IPv6?664326??????0t0??TCP?*:rsync?(LISTEN)

此腳本直接復(fù)制粘貼即可使用，需要/etc/rsyncd.conf配置好pid和鎖文件