shell之脚本实例
shell脚本监控网站并实现邮件、短信报警
shell进程监控脚本（发送邮件报警）
Shell脚本监控服务器在线状态和邮件报警的方法
http://www.jbxue.com/jb/shell/
8.监控日志特定内容
# cat cpu_bug_monitor.sh #!/bin/bash grep "BUG: soft lockup - CPU#" /var/log/messages if [ $? -eq 0 ] ; then counter=`grep "BUG: soft lockup - CPU#" /var/log/messages | wc -l ` echo "`date` ## CPU BUG: $counter times" | mutt -s "CPU BUG" 1397710****@139.com echo "`date` ## CPU BUG: $counter times" >> /tmp/CPU_BUG_STATUS else echo "`date` ## Check CPU BUG normal" >> /tmp/CPU_BUG_STATUS fi 一旦发现日志中出现"BUG: soft lockup - CPU#"将统计次数并发送到1397710****@139.com邮箱。如果正常就记录检查时间和结果到/tmp/CPU_BUG_STATUS。
7.base64bash实现
base64Table=(A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9 + /); function str2binary() { idx=0; for((i=0; i<${#str}; i++)); do dividend=$(printf "%d" "'${str:i:1}"); for((j=0;j<8;j++)); do let idx=8*i+7-j; let bin[$idx]=$dividend%2; dividend=$dividend/2; done; done; let idx=${#str}*8; for((i=0; i<appendEqualCnt*2; i++)); do let bin[$idx]=0; let idx++; done; } function calcBase64() { for((i=0; i<${#bin[*]}/6; i++)); do sum=0; for((j=0; j<6; j++)); do let idx=i*6+j; let n=6-1-j; let sum=sum+${bin[$idx]}*2**n; done; echo -n ${base64Table[$sum]}; done } declare -a bin function base64Encode() { read -p "please enter ASCII string:" str; let appendZero=${#str}*8%6; let bits=${#str}*8; appendEqualCnt=0; if [[ $appendZero -ne 0 ]]; then let appendEqualCnt=(6-$appendZero)/2; fi str2binary; calcBase64; if [[ $appendEqualCnt -eq 2 ]]; then echo -n "=="; elif [[ $appendEqualCnt -eq 1 ]]; then echo -n "="; fi echo; }
6.颜色码表
[root@250-shiyan prog]# cat color
## the test text T='samples'echo echo " default 40m 41m 42m 43m 44m 45m 46m 47m" ## FG 为前景(foreground)色, BG 为背景(background)色 for FGs in ' m' ' 1m' ' 30m' '1;30m' ' 31m' '1;31m' ' 32m' '1;32m' ' 33m' '1;33m' ' 34m' '1;34m' ' 35m' '1;35m' ' 36m' '1;36m' ' 37m' '1;37m' do FG=$(echo $FGs|tr -d ' ') echo -en " $FGs \033[$FG $T " for BG in 40m 41m 42m 43m 44m 45m 46m 47m; do echo -en " \033[$FG\033[$BG $T \033[0m" done echo done echo
5.批量检测url地址是否可以访问的两种写法，for与while
训练点
1.错误时记录到文件中并且同时在控制台输出
2.从文件中循环读入参数，正确错误都记录到文件中，并且在错误时发邮件。
####输入1： [root@250-shiyan prog]# cat web #!/bin/bash monitor_dir=/tmp/monitor/ if [ ! -d $monitor_dir ] then mkdir $monitor_dir fi cd $monitor_dir web_stat_log=web.status if [ ! -f $web_stat_log ] then touch $web_stat_log fi server_list_file=server.list if [ ! -f $server_list_file ] then echo "`date '+%Y-%m-%d %H:%M:%S'` ERROR:$server_list_file NOT exists!" |tee -a $web_stat_log exit 1 fi for website in `cat $server_list_file` do url="http://$website" server_status_code=`curl -o /dev/null -s -m 10 --connect-timeout 10 -w %{http_code} "$url"` if [ "$server_status_code" = "200" ] then echo "`date '+%Y-%m-%d %H:%M:%S'` visit $website status code 200 OK" >>$web_stat_log else echo "`date '+%Y-%m-%d %H:%M:%S'` visit $website error!!! server can't connect at 10s or stop response at 10 s, send alerm sms ..." >>$web_stat_log # echo "!app alarm @136xxxxxxxx server:$website can't connect at 10s or stop response at 10s ..." | nc smsserver port & fi done exit 0 ####输入2： [root@250-shiyan prog]# cat server.list www.1.com www.2.com www.3.com www.4.com www.1.net www.2.net www.3.org www.4.org www.5.cn ####输出： [root@250-shiyan prog]# cat /tmp/monitor/web.status 2015-02-10 14:50:00 ERROR:server.list NOT exists! 2015-02-10 14:50:10 visit www.1.com error!!! server can't connect at 10s or stop response at 10 s, send alerm sms ... 2015-02-10 14:50:11 visit www.2.com error!!! server can't connect at 10s or stop response at 10 s, send alerm sms ... 2015-02-10 14:50:12 visit www.3.com error!!! server can't connect at 10s or stop response at 10 s, send alerm sms ... 2015-02-10 14:50:12 visit www.4.com error!!! server can't connect at 10s or stop response at 10 s, send alerm sms ... 2015-02-10 14:50:14 visit www.1.net error!!! server can't connect at 10s or stop response at 10 s, send alerm sms ... 2015-02-10 14:50:20 visit www.2.net error!!! server can't connect at 10s or stop response at 10 s, send alerm sms ... 2015-02-10 14:50:21 visit www.3.org status code 200 OK 2015-02-10 14:50:22 visit www.4.org status code 200 OK 2015-02-10 14:50:28 visit www.5.cn status code 200 OK ####另外一种写法 ####输入： [root@250-shiyan prog]# cat web1 #!/bin/bash while read URL do echo `date` result=`curl -o /dev/null -s -m 10 --connect-timeout 10 -w %{http_code} $URL` test=`echo $result` if [[ "$test" = "200" ]] then echo "$URL is ok" else echo "$URL is err" #/usr/sbin/sendmail -t << EOF #From:SD-Detect #To:13918888888@139.com,13800000000@139.com #Subject:Detected $URL #------------------------------ #${URL} is err!! #------------------------------ #EOF fi done < /root/sh/prog/server.list [root@250-shiyan prog]# bash web1 Tue Feb 10 15:03:32 CST 2015 www.1.com is err Tue Feb 10 15:03:33 CST 2015 www.2.com is err Tue Feb 10 15:03:34 CST 2015 www.3.com is err Tue Feb 10 15:03:40 CST 2015 www.4.com is err Tue Feb 10 15:03:41 CST 2015 www.1.net is err Tue Feb 10 15:03:41 CST 2015 www.2.net is err Tue Feb 10 15:03:42 CST 2015 www.3.org is ok Tue Feb 10 15:03:43 CST 2015 www.4.org is ok Tue Feb 10 15:03:44 CST 2015 www.5.cn is ok
4.
训练点： 1.从格式化的输入文件中将字段分别分配给read的三个变量 2.awk的与或判断 3.如果错误日志有内容，则将错误内容定义为一个变量，然后传递给邮件函数和短信函数以便通知 4.首次执行时，因为没有Curl_Out.txt与Curl_Out_1.txt文件，会出错，所以第一次先注释掉，然后再打开，就会每次都将以前的内容删掉，重新记录。 ####输入1： [root@250-shiyan monitor]# cat aa #!/bin/bash smail() { mail -s "$1" [email protected] <<EOF $1 $2 ==== report time: `date +"%F %T"` shell script: `echo $0` current user: `whoami` ==== EOF } ssms() { /usr/local/feixin/fetion --mobile=150000000 --pwd=******** --to=13810000000 --msg-gb="fx $1" } cd /tmp/monitor File=server.list #sed -i /.*/d Curl_Out.txt #sed -i /.*/d Curl_Out_1.txt sed -e '/^#/d;/^$/d' ${File} | while read Ip Port URL do /usr/bin/curl --connect-timeout 8 --max-time 12 -o /dev/null -s -w %{time_total}:%{size_download}:%{http_code} http://${URL} -x ${Ip}:${Port} >> Curl_Out.txt echo ":${Ip}:${URL}" >> Curl_Out.txt done awk -F":" '{if(($1*1000<8000)&&($2>0)&&($3=="200"||$3=="301"||$3=="302"||$3=="401")) {} else {print $0 >> "Curl_Out_1.txt"}}' Curl_Out.txt if [ -s Curl_Out_1.txt ] then Warning="`awk '{printf("%s\n",$0)}' Curl_Out_1.txt`" #ssms ${Warning} smail CURL_Monitor ${Warning} fi 输入2： [root@250-shiyan monitor]# cat server.list 192.168.2.2 80 192.168.2.2 192.168.2.84 8080 192.168.2.84/monitor 192.168.2.222 80 192.168.2.222 192.168.2.225 80 192.168.2.225 [root@250-shiyan monitor]# ls aa server.list 输出1：到文件中 [root@250-shiyan monitor]# bash aa [root@250-shiyan monitor]# ls aa Curl_Out_1.txt Curl_Out.txt server.list [root@250-shiyan monitor]# cat Curl_Out.txt 0.044:1576:200:192.168.2.2:192.168.2.2 0.004:0:302:192.168.2.84:192.168.2.84/monitor 0.050:1563:200:192.168.2.222:192.168.2.222 0.027:1550:200:192.168.2.225:192.168.2.225 [root@250-shiyan monitor]# cat Curl_Out_1.txt 0.004:0:302:192.168.2.84:192.168.2.84/monitor 输出2：到邮件中，以下是内容 CURL_Monitor 0.004:0:302:192.168.2.84:192.168.2.84/monitor ==== report time: 2015-02-10 15:58:43 shell script: aa current user: root ====
3.
2.监控磁盘并发邮件
####第一步安装mail客户端，写邮件地址，写脚本 [root@250-shiyan ~]# vi disk #!/bin/bash yum install mail mailaddr=createyuan1@126.com smtpserver=smtp.126.com user=createyuan1 passwd=******* cat <<EOF >/etc/mail.rc set from=$mailaddr set smtp=$smtpserver set smtp-auth=login set smtp-auth-user=$user set smtp-auth-password=$passwd EOF space=`df|sed -n '/\/$/p'|gawk '{print $5}'|sed 's/%//'` if [ $space -ge 10 ] then echo "disk is $space" >/tmp/test mail -v -s "testse" [email protected] < /tmp/test fi ####第二步加入计划任务中执行 [root@250-shiyan ~]# crontab -e no crontab for root - using an empty one crontab: installing new crontab [root@250-shiyan ~]# crontab -l 1 * * * * bash /root/disk
[root@250-shiyan prog]# cat disk1
#!/bin/bash
while sleep 5
do
for i in `df -h |sed -n '/\/$/p'|awk '{print $5}'|sed 's/\%//g'`
do echo $i
if [ $i -ge 10 ]
then
echo "the disk is "
fi
done
done
1.样例
如果是139邮箱还可免费手机短信通知。
注：通过系统直接发送mail容易被拦截，可使用mail连接第三方smtp发送邮件。
#!/bin/bash
for URL in http://www.abc.com http://www.88888.cn
do
#获取http响应代码
HTTP_CODE=`curl -o /dev/null -s -w "%{http_code}" "${URL}"`
#服务器能正常响应，应该返回200的代码
if [ $HTTP_CODE = 200 ]
then
echo "$URL is OK" | /bin/mail -s "Http Check" [email protected]
# else
# /usr/local/fetion/fetion --mobile=1356440xxxx --pwd 123456 --to=1885151xxxx --msg-utf8="$URL is ERROR; error code is $HTTP_CODE"
fi
done
主要是利用 curl -o /dev/null -s -m 10 --connect-timeout 10 -w %{http_code} "$url" 返回状态码是否200,如果10s没有返回200状态码，则发警报
-o 参数，是把下载的所有内容都重定向到/dev/null，-s命令，是屏蔽了curl本身的输出，而-w参数，是根据我们自己的需要，自定义了curl的输出格式。
使用这条命令，再配合邮件和短信，就可以实现对页面的可用性监控。将这个程序部署在全国各地的机器上，就可以对cdn网络进行可用性监控。
curl只返回服务器响应状态，不返回内容，返回200是正常的，其它的不正常，简单的命令如下：
[coomix@localhost ~]$ echo `curl -o /dev/null -s -m 10 --connect-timeout 10 -w %{http_code} "http://www.jbxue.com/index.php"`
200
[coomix@localhost ~]$ echo `curl -o /dev/null -s -m 10 --connect-timeout 10 -w %{http_code} "http://www.jbxue.com/index5.php"`
404