MySQL的一些功能实用的Linux shell脚本分享

前端技术 2023/09/02 MYSQL

Memcached启动脚本

# vim /etc/init.d/memcached

#!/bin/bash
#=======================================================================================
# chkconfig: - 80 12
# description: Distributed memory caching daemon
# processname: memcached
#=======================================================================================
IPADDR=`/sbin/ifconfig eth1 | awk -F \':\' \'/inet addr/{print $2}\' | sed \'s/[a-zA-Z ]//g\'`
PORT=\"11211\"
USER=\"root\"
SIZE=\"2048\"
CONNNUM=\"51200\"
PIDFILE=\"/var/run/memcached.pid\"
BINFILE=\"/usr/local/memcached/bin/memcached\"
LOCKFILE=\"/var/lock/subsys/memcached\"
RETVAL=0
      
start() {
  echo -n $\"Starting memcached......\"
  $BINFILE -d -l $IPADDR -p $PORT -u $USER -m $SIZE -c $CONNNUM -P $PIDFILE
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && touch $LOCKFILE
        
  return $RETVAL
}
      
stop() {
  echo -n $\"Shutting down memcached......\"
  /sbin/killproc $BINFILE
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && rm -f $LOCKFILE
        
  return $RETVAL
}
      
restart() {
  stop
  sleep 1
  start
}
      
reload() {
  echo -n $\"Reloading memcached......\"
  /sbin/killproc $BINFILE -HUP
  RETVAL=$?
  echo
        
  return $RETVAL
}
      
case \"$1\" in
start)
  start
  ;;
        
stop)
  stop
  ;;
        
restart)
  restart
  ;;
        
condrestart)
  [ -e $LOCKFILE ] && restart
  RETVAL=$?
  ;;
        
reload)
  reload
  ;;
        
status)
  status $prog
  RETVAL=$?
  ;;
        
*)
  echo \"Usage: $0 {start|stop|restart|condrestart|status}\"
  RETVAL=1
esac

exit $RETVAL
# chmod +x /etc/init.d/memcached
# chkconfig --add memcached
# chkconfig --level 235 memcached on
# service memcached start

binlog 自动清理脚本

# vim /data/scripts/delete_mysql_binlog.sh

#!/bin/bash
#=======================================================================================
#  用于删除 MySQL Master 端已经同步完的 binlog【需在 Master 端运行】，以减少磁盘空间
#  每天凌晨 5:30 分运行一次
#
#  注：需在 Slave 端添加允许 Master 端访问的帐号【帐号：check_binlog，密码：binlog_2356】
#     运行于 MySQL Master 端【目前只用于一主一从的同步模式，对于多从的情况暂时未考虑】
#=======================================================================================
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
   
## Slave端连接信息
SLAVE_ADDR=\"XXX.XXX.XXX.XXX\"
SLAVE_USER=\"check_binlog\"
SLAVE_PWD=\"binlog_2356\"
   
LOGFILE=\"/data/logs/db_sync_info.log\"
PINGFILE=\"/tmp/mysqlping.log\"
   
## MySQL状态信息查看命令
SQLCMD=\"show slave status\"
   
#=======================================================================================
## 检查MySQL是否已经运行
if [[ `ps aux | grep mysql[d] | wc -l` -eq 0 ]]; then
  echo The MySQL is not running at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
  exit 1
fi
   
## 测试Slave端的连通性
nohup mysqladmin -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} ping > ${PINGFILE}
retval=`grep \"^error\" ${PINGFILE}`
rm -f ${PINGFILE}
if [[ \"${retval}X\" != \"X\" ]]; then
  echo The MySQL Slave can not be connected at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
  exit 1
fi
   
## 检查是否合法的Slave
MASTER_ADDR=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e \"${SQLCMD}\\G;\" | awk \'$1==\"Master_Host:\" {print $2}\'`
LOCAL_ADDR=`/sbin/ifconfig eth1 | awk -F \':\' \'/inet addr/{print $2}\' | sed \'s/[a-zA-Z ]//g\'`
if [[ \"${MASTER_ADDR}\" != \"${LOCAL_ADDR}\" ]]; then
  echo The MySQL Slave is not lawful at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
  exit 1
fi
   
## 获得Slave端信息，以此来确定是否处于正常同步的情况
IO_STATUS=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e \"${SQLCMD}\\G;\" | awk \'$1==\"Slave_IO_Running:\" {print $2}\'`
SQL_STATUS=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e \"${SQLCMD}\\G;\" | awk \'$1==\"Slave_SQL_Running:\" {print $2}\'`
if [[ \"${IO_STATUS}\" != \"Yes\" || \"${SQL_STATUS}\" != \"Yes\" ]]; then
  echo The MySQL Replication is not synchronous at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
  exit 1
fi
   
## 再做一次判断，以保证数据同步绝对正常【创建测试数据】
mysql -uroot -e \"create database if not exists mytestdb;\"
sleep 3
   
retval=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e \"show databases;\" | grep mytestdb`
mysql -uroot -e \"drop database if exists mytestdb;\"
if [[ \"${retval}X\" = \"X\" ]]; then
  echo The MySQL Replication is not synchronous at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
  exit 1
fi
   
## 在已经同步的情况，还需要判断当前同步的binlog，以此来确定哪些已经是过期的binlog
SLAVE_BINLOG1=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e \"${SQLCMD}\\G;\" | awk \'$1==\"Master_Log_File:\" {print $2}\'`
SLAVE_BINLOG2=`mysql -h${SLAVE_ADDR} -u${SLAVE_USER} -p${SLAVE_PWD} -e \"${SQLCMD}\\G;\" | awk \'$1==\"Relay_Master_Log_File:\" {print $2}\'`
## 获得Master端，当前的binlog文件以及binlog路径
MASTER_BINLOG=`mysql -uroot -e \"show master status;\" | grep -v \'^+\' | tail -1 | awk \'{print $1}\'`
   
## 主从端已经同步到相同的binlog
if [[ \"${SLAVE_BINLOG1}\" = \"${SLAVE_BINLOG2}\" && \"${SLAVE_BINLOG1}\" = \"${MASTER_BINLOG}\" ]]; then
  CURR_BINLOG=\"${MASTER_BINLOG}\"
     
## 主从端已经同步，但从端的binlog还没有追赶到主端最新的binlog
elif [[ \"${SLAVE_BINLOG1}\" = \"${SLAVE_BINLOG2}\" && \"${SLAVE_BINLOG1}\" != \"${MASTER_BINLOG}\" ]]; then
  CURR_BINLOG=\"${SLAVE_BINLOG1}\"
     
## 主从端已经同步，主从端的binlog一致，但relaylog还不一致
elif [[ \"${SLAVE_BINLOG1}\" != \"${SLAVE_BINLOG2}\" && \"${SLAVE_BINLOG1}\" = \"${MASTER_BINLOG}\" ]]; then
  CURR_BINLOG=\"${SLAVE_BINLOG2}\"
     
else
  echo Has noknown error at：`date +%F\" \"%H-%M-%S` >> ${LOGFILE}
  exit 1
fi
   
mysql -uroot -e \"purge binary logs to \'${CURR_BINLOG}\';\"
if [[ $? -eq 0 ]]; then
  echo Clear MySQL binlog is ok at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
fi

# crontab -e 
30 05 * * * /data/scripts/delete_mysql_binlog.sh >/dev/null 2>&1

修复MySQL主从同步

#!/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
  
LOGFILE=/data/repair_mysql_sync_`date +%F`.log
SQLCMD1=\"show slave status\"
  
## 查看MySQL是否已启动
if [[ `ps aux | grep mysqld | grep -v grep`\"X\" = \"X\" ]]; then
  echo The MySQL is not running at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
  exit 1
fi
  
## 获得MySQL从端Relay binlog的路径
retval=`grep \"^relay-log\" /etc/my.cnf | grep -v relay-log- | grep \'/\'`
if [[ \"${retval}\" = \"X\" ]]; then
  RELAY_BINLOG_PATH=`ps aux | grep -w mysqld | grep -v grep | awk \'{print $13}\' | awk -F \'=\' \'{print $2}\'`
else
  RELAY_BINLOG_PATH=`dirname $(echo ${retval} | awk -F \'=\' \'{print $2}\')`
fi
  
## 查找master.info文件，用于定位Binlog信息
MASTER_FILE=`ps aux | grep -w mysqld | grep -v grep | awk \'{print $13}\' | awk -F \'=\' \'{print $2}\'`/master.info
if [[ ! -e ${MASTER_FILE} ]]; then
  echo This Server is not MySQL Slave at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
  exit 1
fi
  
## 获得当前的同步状态
IO_STATUS=`mysql -uroot -e \"${SQLCMD1}\\G;\" | awk \'$1==\"Slave_IO_Running:\" {print $2}\'`
SQL_STATUS=`mysql -uroot -e \"${SQLCMD1}\\G;\" | awk \'$1==\"Slave_SQL_Running:\" {print $2}\'`
if [[ \"${IO_STATUS}\" = \"Yes\" && \"${SQL_STATUS}\" = \"Yes\" ]]; then
  echo Now, The MySQL Replication is synchronous at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
  exit 0
fi
  
## 从master.info文件中，获得MySQL主端的同步信息
REPLI_INFO=`sed \'/^$/d\' ${MASTER_FILE} | tail +2 | head -5`
REPLI_BINLOG_FILE=`echo ${REPLI_INFO} | awk \'{print $1}\'`
REPLI_IPADDR=`echo ${REPLI_INFO} | awk \'{print $3}\'`
REPLI_USER=`echo ${REPLI_INFO} | awk \'{print $4}\'`
REPLI_PWD=`echo ${REPLI_INFO} | awk \'{print $5}\'`
  
## 删除无用的Relay binlog
rm -rf ${RELAY_BINLOG_PATH}/*-relay-bin.*
  
## 直接从0位置开始同步
SQLCMD2=\"change master to master_host=\'${REPLI_IPADDR}\', master_user=\'${REPLI_USER}\', master_password=\'${REPLI_PWD}\',\"
SQLCMD2=\"${SQLCMD2} master_log_file=\'${REPLI_BINLOG_FILE}\', master_log_pos=0\"
mysql -uroot -e \"stop slave;\"
mysql -uroot -e \"${SQLCMD2};\"
mysql -uroot -e \"start slave;\"
  
## 如果同步的过程中，出现重复记录导致同步失败，就跳过
while true
do
  sleep 2
  IO_STATUS=`mysql -uroot -e \"${SQLCMD1}\\G;\" | awk \'$1==\"Slave_IO_Running:\" {print $2}\'`
  SQL_STATUS=`mysql -uroot -e \"${SQLCMD1}\\G;\" | awk \'$1==\"Slave_SQL_Running:\" {print $2}\'`
  BEHIND_STATUS=`mysql -uroot -e \"${SQLCMD1}\\G;\" | awk \'$1==\"Seconds_Behind_Master:\" {print $2}\'`
  SLAVE_BINLOG1=`mysql -uroot -e \"${SQLCMD1}\\G;\" | awk \'$1==\"Master_Log_File:\" {print $2}\'`
  SLAVE_BINLOG2=`mysql -uroot -e \"${SQLCMD1}\\G;\" | awk \'$1==\"Relay_Master_Log_File:\" {print $2}\'`
    
  ## 出现错误，就将错误信息记录到日志文件，并跳过错误继续同步
  if [[ \"${IO_STATUS}\" != \"Yes\" || \"${SQL_STATUS}\" != \"Yes\" ]]; then
    ERRORINFO=`mysql -uroot -e \"${SQLCMD1}\\G;\" | awk -F \': \' \'$1==\"Last_Error\" {print $2}\'`
    echo \"The MySQL synchronous error information: ${ERRORINFO}\" >> ${LOGFILE}
    mysql -uroot -e \"stop slave;\"
    mysql -uroot -e \"set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;\"
    mysql -uroot -e \"start slave;\"
      
  ## 已完成同步，就正常退出
  elif [[ \"${IO_STATUS}\" = \"Yes\" && \"${SQL_STATUS}\" = \"Yes\" && \"${SLAVE_BINLOG1}\" = \"${SLAVE_BINLOG2}\" && ${BEHIND_STATUS} -eq 0 ]]; then
    echo The MySQL synchronous is ok at: `date +%F\" \"%H-%M-%S` >> ${LOGFILE}
    break
  fi
done

本文地址：https://www.stayed.cn/item/4708

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