笔试题 shell

Posted 2020-10-15 乌托邦眺望

企业实践题1：（生产实战案例）：监控mysql主从同步是否异常，如果异常，则发送短信或者邮件给管理员。提示：如果没主从同步环境,可以用下面文本放到文件里读取来模拟：
阶段1：开发一个守护进程脚本每30秒实现检测一次。
阶段2：如果同步出现如下错误号（1158,1159,1008,1007,1062），则跳过错误。

阶段3：请使用数组技术实现上述脚本（获取主从判断及错误号部分）

mysql查看状态语句  

mysql>show slave status\G

 

*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.42
                  Master_User: backup
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 538
               Relay_Log_File: mysql-relay-bin.000002
                Relay_Log_Pos: 701
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

使用MysqlCmd2 命令筛选后语句：

Yes
Yes
0
0
it

#!/bin/bash

port=3306
error=(1158 1159 1008 1007 1062)
MysqlCmd1= mysql -uroot -p192.168.51.9 -e
MysqlCmd2= mysql -uroot -p192.168.51.9 -e"show slave status\G"|egrep "_Running|Last_Errno|Behind_Master"|awk ‘{print $NF}‘

function is_run(){
 [ `lsof -i:$port|wc -l` -lt 2 ]&&{
 echo"mysql is stop"
 exit 1
 }
}


function mysql_status(){
 array=(`$MysqlCmd2`)
 }


function judge_error(){
for i in ${error[*]}
do 
  if [ "${array[2]}" == "$i" ];then
   $MysqlCmd1"stop slave;SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;start slave;"
  else
   echo "mysql is failed,error id is ${array[2]}"
  fi
done
}

judge_status(){
mysql_status
echo ${array[*]}
if [ "${array[0]}" == "Yes" -a "${array[1]}" == "Yes" -a "${array[3]}" == "0" ];then
    echo "Mysql slave is ok"
else
    judge_error ${array[2]}
fi
}


function main(){
while true
 do
   is_run
   judge_status
   sleep 30
 done
}


main

View Code

 1 #!/bin/bash
 2 
 3 port=3306
 4 error=(1158 1159 1008 1007 1062)
 5 MysqlCmd1= mysql -uroot -p192.168.51.9 -e
 6 MysqlCmd2= mysql -uroot -p192.168.51.9 -e"show slave status\G"|egrep "_Running|Last_Errno|Behind_Master"|awk ‘{print $NF}‘
 7 
 8 function is_run(){
 9  [ `lsof -i:$port|wc -l` -lt 2 ]&&{
10  echo"mysql is stop"
11  exit 1
12  }
13 }
14 
15 
16 function mysql_status(){
17  array=(`$MysqlCmd2`)
18  }
19 
20 
21 function judge_error(){
22 for i in ${error[*]}
23 do 
24   if [ "${array[2]}" == "$i" ];then
25    $MysqlCmd1"stop slave;SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;start slave;"
26   else
27    echo "mysql is failed,error id is ${array[2]}"
28   fi
29 done
30 }
31 
32 judge_status(){
33 mysql_status
34 echo ${array[*]}
35 if [ "${array[0]}" == "Yes" -a "${array[1]}" == "Yes" -a "${array[3]}" == "0" ];then
36     echo "Mysql slave is ok"
37 else
38     judge_error ${array[2]}
39 fi
40 }
41 
42 
43 function main(){
44 while true
45  do
46    is_run
47    judge_status
48    sleep 30
49  done
50 }
51 
52 
53 main

 

#!/bin/bash

port=3306
error=(1158 1159 1008 1007 1062)
MysqlCmd1= mysql -uroot -p192.168.51.9 -e
MysqlCmd2= mysql -uroot -p192.168.51.9 -e"show slave status\G"|egrep "_Running|Last_Errno|Behind_Master"|awk ‘{print $NF}‘

function is_run(){
 [ `lsof -i:$port|wc -l` -lt 2 ]&&{
 echo"mysql is stop"
 exit 1
 }
}


function mysql_status(){
 array=(`$MysqlCmd2`)
 }


function judge_error(){
for i in ${error[*]}
do 
  if [ "${array[2]}" == "$i" ];then
   $MysqlCmd1"stop slave;SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;start slave;"
  else
   echo "mysql is failed,error id is ${array[2]}"
  fi
done
}

judge_status(){
mysql_status
echo ${array[*]}
if [ "${array[0]}" == "Yes" -a "${array[1]}" == "Yes" -a "${array[3]}" == "0" ];then
    echo "Mysql slave is ok"
else
    judge_error ${array[2]}
fi
}


function main(){
while true
 do
   is_run
   judge_status
   sleep 30
 done
}


main

 

 

企业实践题2：
使用for循环在/oldboy目录下通过随机小写10个字母加固定字符串oldboy批量创建10个html文件，名称例如为：

coaolvajcq_oldboy.html  qnvuxvicni_oldboy.html

#!/bin/for((i=1;i<=10;i++ ))
do
a=`tr -dc "a-z"  < /dev/urandom | head -c 10`_oldboy,html
  touch $dir/$a
done

#tr -dc 的意思是，将字符串中a到z 以外的字符提取并删除