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<title> [筆記] CentOS Linux 底下，偵測檔案內容異動 發信通知 | My cool new Blog</title>
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<a class="bubble" href="/article/e7-ad-86-e8-a8-98-centos-linux-e5-ba-95-e4-b8-8b-ef-bc-8c-e5-81-b5-e6-b8-ac-e6-aa-94-e6-a1-88-e5-85-a7-e5-ae-b9-e7-95-b0-e5-8b-95-e7-99-bc-e4-bf-a1-e9-80-9a-e7-9f-a5/">
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<h3><a href="/article/e7-ad-86-e8-a8-98-centos-linux-e5-ba-95-e4-b8-8b-ef-bc-8c-e5-81-b5-e6-b8-ac-e6-aa-94-e6-a1-88-e5-85-a7-e5-ae-b9-e7-95-b0-e5-8b-95-e7-99-bc-e4-bf-a1-e9-80-9a-e7-9f-a5/">[筆記] CentOS Linux 底下，偵測檔案內容異動 發信通知</a></h3>
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<span class="date moment">2017-01-12</span>
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<a href="/categories/%E5%B7%A5%E4%BD%9C%E7%AD%86%E8%A8%98">工作筆記</a>
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</div>
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<p>最近在玩很久以前弄好的Smokeping裡面的Notify功能，希望能在VPN斷線的時候，第一時間得到訊息</p>
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<p>雖然設定好了，但感覺Smokeping在送出警告信件的速度有點慢</p>
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<p>所以另外找了個方法去檢查 smokeping.log，當檔案內容有異動時，就會發信通知，然後放到crontab裡，每分鐘檢查一次</p>
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<p>程式內容如下</p>
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<p>
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> #!/usr/bin/env bash
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>
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> #
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>
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> # Provides : Check if a file is changed
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>
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> #
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>
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> # Limitations : none
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>
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> # Options : none
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>
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> # Requirements : bash, md5sum, cut
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>
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> #
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>
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> # Modified : 11|07|2014
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>
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> # Author : ItsMe
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>
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> # Reply to : n/a in public
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>
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> #
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>
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> # Editor : joe
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>
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> #
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>
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> #####################################
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>
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> #
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>
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> # OK - lets work
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>
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> #
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>
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>
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> # what file do we want to monitor?
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>
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> # I did not include commandline options
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>
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> # but its easy to catch a command line option
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>
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> # and replace the defaul given here
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>
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> file=/var/log/smokeping.log #設定要監控的目標檔案
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>
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>
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> # path to file’s saved md5sum
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>
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> # I did not spend much effort in naming this file
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>
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> # if you ahve to test multiple files
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>
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> # so just use a commandline option and use the given
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>
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> # file name like: filename=$(basename “$file”)
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>
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> fingerprintfile=/tmp/.bla.md5savefile #md5計算結果暫存檔
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>
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>
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> # does the file exist? #檢查目標檔案是否存在
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>
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> if [ ! -f $file ]
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>
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> then
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>
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> echo “ERROR: $file does not exist - aborting”
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>
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> exit 1
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>
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> fi
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>
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> # create the md5sum from the file to check #計算目標檔案的md5 checksum
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>
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> filemd5=<code>md5sum $file | cut -d " " -f1</code>
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>
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>
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> # check the md5 and
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>
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> # show an error when we check an empty file #確認不是空檔案
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>
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> if [ -z $filemd5 ]
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>
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> then
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>
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> echo “The file is empty - aborting”
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>
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> exit 1
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>
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> else
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>
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> # pass silent
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>
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> :
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>
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> fi
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>
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>
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> # do we have allready an saved fingerprint of this file?
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>
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> if [ -f $fingerprintfile ]
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>
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> then
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>
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> # yup - get the saved md5
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>
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> savedmd5=<code>cat $fingerprintfile</code>
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>
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>
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> # check again if its empty
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>
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> if [ -z $savedmd5 ]
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>
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> then
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>
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> echo “The file is empty - aborting”
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>
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> exit 1
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>
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> fi
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>
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>
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> #compare the saved md5 with the one we have now #比對暫存檔和目標檔案的check sum , 如果不相符就寄出信件並附上最後一行
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>
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> if [ “$savedmd5” = “$filemd5” ]
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>
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> then
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>
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> # pass silent
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>
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> :
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>
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> else
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>
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> # echo “File has been changed”
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>
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> tail -1 /var/log/smokeping.log |mail -s ‘Alert’ -v chchang@[192.168.10.240]
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>
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>
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> # this does an beep on your pc speaker (probably)
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>
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> # you get this character when you do:
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>
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> # CTRL+V CTRL+G
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>
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> fi
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>
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>
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> # do we have allready an saved fingerprint of this file?
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>
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> if [ -f $fingerprintfile ]
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>
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> then
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>
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> # yup - get the saved md5
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>
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> savedmd5=<code>cat $fingerprintfile</code>
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>
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>
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> # check again if its empty
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>
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> if [ -z $savedmd5 ]
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>
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> then
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>
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> echo “The file is empty - aborting”
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>
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> exit 1
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>
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> fi
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>
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>
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> #compare the saved md5 with the one we have now
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>
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> if [ “$savedmd5” = “$filemd5” ]
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>
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> then
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>
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> # pass silent
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>
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> :
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>
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> else
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>
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> # echo “File has been changed”
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>
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> tail -1 /var/log/smokeping.log |mail -s ‘Alert’ -v chchang@[192.168.10.240]
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>
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>
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> # this does an beep on your pc speaker (probably)
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>
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> # you get this character when you do:
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>
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> # CTRL+V CTRL+G
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>
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> # this is a bit creepy so you can use the ‘beep’ command
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>
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> # of your distro
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>
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> # or run some command you want to
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>
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> echo
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>
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> fi
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>
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>
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> fi
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>
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>
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> # save the current md5
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>
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> # sure you don’t have to do this when the file hasn’t changed
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>
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> # but you know I’m lazy and it works…
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>
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> echo $filemd5 > $fingerprintfile
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</p>
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<p>編輯好之後，就放到crontab去</p>
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<p>不過後來覺得有點脫褲子放屁了</p>
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<p>實際的狀況會是這樣，由Smokeping發出的信件，和這個偵測機制發出的信件，其實也沒差幾秒鐘</p>
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<p>似乎不必另外去偵測了</p>
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<p><img src="http://wp.cowbay.org/wp-content/uploads/2017/01/2017-01-17_08-48-56.png" alt="2017-01-17_08-48-56" /></p>
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<p> </p>
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<p> </p>
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<p> </p>
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