一般Mysql数据库备份会采用在MYSQL从库上执行全量备份+增量备份方式。在从库备份避免Mysql主库备份的时候锁表造成业务影响。
shell> vim db_backup.sh #!/bin/bash # description: MySQL buckup shell script # author: magedu.com # 192.168.10.10 为专门的备份服务器,需要做一下服务器之间免密码登录 #备份的数据库名 DATABASES=( "magedu01" "magedu02" ) USER="root" PASSWORD="dbpwd123" MAIL="magedu@gmail.com" BACKUP_DIR=/data/backup LOGFILE=/data/backup/data_backup.log DATE=`date +%Y%m%d_%H%M` cd $BACKUP_DIR #开始备份之前,将备份信息头写入日记文件 echo "--------------------" >> $LOGFILE echo "BACKUP DATE:" $(date +"%y-%m-%d %H:%M:%S") >> $LOGFILE echo "-------------------" >> $LOGFILE for DATABASE in ${DATABASES};do /usr/local/mysql/bin/mysqldump -u$USER -p$PASSWORD --events -R --opt $DATABASE |gzip >${BACKUP_DIR}\/${DATABASE}_${DATE}.sql.gz if [ $? == 0 ];then echo "$DATE--$DATABASE is backup succeed" >> $LOGFILE else echo "Database Backup Fail!" >> $LOGFILE done #判断数据库备份是否全部成功,全部成功就同步到异地备份f服务器 if [ $? == 0 ];then /usr/bin/rsync -zrtopg --delete /data/backup/* root@192.168.10.10:/data/backup/ >/dev/null 2>&1 else echo "Database Backup Fail!" >> $LOGFILE #备份失败后向管理者发送邮件提醒 mail -s "database Daily Backup Fail!" $MAIL fi #删除30天以上的备份文件 find $BACKUP_DIR -type f -mtime +30 -name "*.gz" -exec rm -f {} \;
企业负载均衡层如果用到Nginx+Keepalived架构,而Keepalived无法进行Nginx服务的实时切换,所以这里用了一个监控脚本check_nginx_pid.sh,每隔5秒就监控一次Nginx的运行状态,如果发现有问题就关闭本机的Keepalived程序,让VIP切换到从Nginx负载均衡器上。
shell> vim check_nginx_pid.sh #!/bin/bash while : do nginxpid='ps -C nginx --no-header | wc -l' if [$nginxpid -eq 0 ];then ulimit -SHn 65535 /usr/local/nginx/sbin/nginx sleep 5 nginxpid='ps -C nginx --no-header | wc -l' if [$nginxpid -eq 0 ];then /etc/init.d/keepalived stop fi fi sleep 5 done
此脚本应该能适应各种各样不同的内外网环境。
让脚本也顺便监控下MySQL是否正常运行。
Slave机器的IO和SQL状态都必须为YES,缺一不可,这里用到了多重条件判断-a。
shell> check_mysql_slave.sh #!/bin/bash #check MySQL_Slave Status MYSQLPORT='netstat -na|grep "LISTEN"|grep "3306"|awk -F[:" "]+ '{print $4}'' MYSQLIP='ifconfig eth0|grep "inet addr" | awk -F[:" "]+ '{print $4}'' STATUS=$(/usr/local/mysql/bin/mysql -u dbuser -dbpwd123 -S /tmp/mysql.sock -e "show slave status\G" | grep -i "running") IO_env='echo $STATUS | grep IO | awk ' {print $2}'' SQL_env='echo $STATUS | grep SQL | awk '{print $2}'' if [ "$MYSQLPORT" == "3306" ] then echo "mysql is running" else mail -s "warn!server: $MYSQLIP mysql is down" magedu@gmail.com fi if [ "$IO_env" = "Yes" -a "$SQL_env" = "Yes" ] then echo "Slave is running!" else echo "####### $date #########">> /data/log/check_mysql_slave.log echo "Slave is not running!" >> /data/log/check_mysql_slave.log mail -s "warn! $MySQLIP_replicate_error" magedu@gmail.com << /data/log/check_mysql_slave.log fi # 建议每10分钟运行一次: shell> crontab -e */10 * * * * root /bin/sh /root/check_mysql_slave.sh
此脚本用于新装Linux的相关配置工作,比如更换默认yum源,优化系统内核、停掉一些没必要启动的系统服务等。此脚本尤其适合大批新安装的CentOS系列的服务器。适用于Centos7
shell>vim cenots_7_system_init.sh #!/bin/bash # Filename: centos7-init.sh # Author: magedu@gmail.com #判断是否为root用户 if [ `whoami` != "root" ];then echo " only root can run it" exit 1 fi #执行前提示 echo -e "\033[31m 这是centos7系统初始化脚本,将更新系统内核至最新版本,请慎重运行!\033[0m" read -s -n1 -p "Press any key to continue or ctrl+C to cancel" echo "Your inputs: $REPLY" #1.定义配置yum源的函数 yum_config(){ mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo yum clean all && yum makecache } #2.定义配置NTP的函数 ntp_config(){ yum –y install chrony systemctl start chronyd && systemctl enable chronyd timedatectl set-timezone Asia/Shanghai && timedatectl set-ntp yes } #3.定义关闭防火墙的函数 close_firewalld(){ systemctl stop firewalld.service &> /dev/null systemctl disable firewalld.service &> /dev/null } #4.定义关闭selinux的函数 close_selinux(){ setenforce 0 sed -i 's/enforcing/disabled/g' /etc/selinux/config } #5.定义安装常用工具的函数 yum_tools(){ yum install –y vim wget curl curl-devel bash-completion lsof iotop iostat unzip bzip2 bzip2-devel yum install –y gcc gcc-c++ make cmake autoconf openssl-devel openssl-perl net-tools source /usr/share/bash-completion/bash_completion } #6.定义升级最新内核的函数 update_kernel (){ rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm yum --enablerepo=elrepo-kernel install -y kernel-ml grub2-set-default 0 grub2-mkconfig -o /boot/grub2/grub.cfg } #执行脚本 main(){ yum_config; ntp_config; close_firewalld; close_selinux; yum_tools; update_kernel; } main
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