① Dos 攻击防范（自动屏蔽攻击 IP）

#!/bin/bash
DATE=$(date +%d/%b/%Y:%H:%M)
LOG_FILE=/usr/local/nginx/logs/demo2.access.log
ABNORMAL_IP=$(tail -n5000 $LOG_FILE |grep $DATE |awk '{a[$1]++}END{for(i in a)if(a[i]>10)print i}')
for IP in $ABNORMAL_IP; doif [ $(iptables -vnL |grep -c "$IP") -eq 0 ]; theniptables -I INPUT -s $IP -j DROPecho "$(date +'%F_%T') $IP" >> /tmp/drop_ip.logfi
done

② Linux 系统发送告警脚本

# yum install mailx# vi /etc/mail.rc
set from=baojingtongzhi@163.com smtp=smtp.163.com
set smtp-auth-user=baojingtongzhi@163.com smtp-auth-password=123456
set smtp-auth=login

③ MySQL 数据库备份单循环

#!/bin/bash
DATE=$(date +%F_%H-%M-%S)
HOST=localhost
USER=backup
PASS=123.com
BACKUP_DIR=/data/db_backup
DB_LIST=$(mysql -h$HOST -u$USER -p$PASS -s -e "show databases;" 2>/dev/null |egrep -v "Database|information_schema|mysql|performance_schema|sys")for DB in $DB_LIST; doBACKUP_NAME=$BACKUP_DIR/${DB}_${DATE}.sqlif ! mysqldump -h$HOST -u$USER -p$PASS -B $DB > $BACKUP_NAME 2>/dev/null; thenecho "$BACKUP_NAME 备份失败!"fi
done

④ MySQL 数据库备份多循环

#!/bin/bash
DATE=$(date +%F_%H-%M-%S)
HOST=localhost
USER=backup
PASS=123.com
BACKUP_DIR=/data/db_backup
DB_LIST=$(mysql -h$HOST -u$USER -p$PASS -s -e "show databases;" 2>/dev/null |egrep -v "Database|information_schema|mysql|performance_schema|sys")for DB in $DB_LIST; doBACKUP_DB_DIR=$BACKUP_DIR/${DB}_${DATE}[ ! -d $BACKUP_DB_DIR ] && mkdir -p $BACKUP_DB_DIR &>/dev/nullTABLE_LIST=$(mysql -h$HOST -u$USER -p$PASS -s -e "use $DB;show tables;" 2>/dev/null)for TABLE in $TABLE_LIST; doBACKUP_NAME=$BACKUP_DB_DIR/${TABLE}.sqlif ! mysqldump -h$HOST -u$USER -p$PASS $DB $TABLE > $BACKUP_NAME 2>/dev/null; thenecho "$BACKUP_NAME 备份失败!"fidone
done

⑤ Nginx 访问日志按天切割

#!/bin/bash
LOG_DIR=/usr/local/nginx/logs
YESTERDAY_TIME=$(date -d "yesterday" +%F)
LOG_MONTH_DIR=$LOG_DIR/$(date +"%Y-%m")
LOG_FILE_LIST="default.access.log"for LOG_FILE in $LOG_FILE_LIST; do[ ! -d $LOG_MONTH_DIR ] && mkdir -p $LOG_MONTH_DIRmv $LOG_DIR/$LOG_FILE $LOG_MONTH_DIR/${LOG_FILE}_${YESTERDAY_TIME}
donekill -USR1 $(cat /var/run/nginx.pid)

⑥ Nginx 访问日志分析脚本

#!/bin/bash
# 日志格式: $remote_addr - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" "$http_x_forwarded_for"
LOG_FILE=$1
echo "统计访问最多的10个IP"
awk '{a[$1]++}END{print "UV:",length(a);for(v in a)print v,a[v]}' $LOG_FILE |sort -k2 -nr |head -10
echo "----------------------"echo "统计时间段访问最多的IP"
awk '$4>="[01/Dec/2018:13:20:25" && $4<="[27/Nov/2018:16:20:49"{a[$1]++}END{for(v in a)print v,a[v]}' $LOG_FILE |sort -k2 -nr|head -10
echo "----------------------"echo "统计访问最多的10个页面"
awk '{a[$7]++}END{print "PV:",length(a);for(v in a){if(a[v]>10)print v,a[v]}}' $LOG_FILE |sort -k2 -nr
echo "----------------------"echo "统计访问页面状态码数量"
awk '{a[$7" "$9]++}END{for(v in a){if(a[v]>5)print v,a[v]}}'

⑦ 查看网卡实时流量脚本

#!/bin/bash
NIC=$1
echo -e " In ------ Out"
while true; doOLD_IN=$(awk '$0~"'$NIC'"{print $2}' /proc/net/dev)OLD_OUT=$(awk '$0~"'$NIC'"{print $10}' /proc/net/dev)sleep 1NEW_IN=$(awk  '$0~"'$NIC'"{print $2}' /proc/net/dev)NEW_OUT=$(awk '$0~"'$NIC'"{print $10}' /proc/net/dev)IN=$(printf "%.1f%s" "$((($NEW_IN-$OLD_IN)/1024))" "KB/s")OUT=$(printf "%.1f%s" "$((($NEW_OUT-$OLD_OUT)/1024))" "KB/s")echo "$IN $OUT"sleep 1
done

⑧ 服务器系统配置初始化脚本

#/bin/bash
# 设置时区并同步时间
ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
if ! crontab -l |grep ntpdate &>/dev/null ; then(echo "* 1 * * * ntpdate time.windows.com >/dev/null 2>&1";crontab -l) |crontab
fi# 禁用selinux
sed -i '/SELINUX/{s/permissive/disabled/}' /etc/selinux/config# 关闭防火墙
if egrep "7.[0-9]" /etc/redhat-release &>/dev/null; thensystemctl stop firewalldsystemctl disable firewalld
elif egrep "6.[0-9]" /etc/redhat-release &>/dev/null; thenservice iptables stopchkconfig iptables off
fi# 历史命令显示操作时间
if ! grep HISTTIMEFORMAT /etc/bashrc; thenecho 'export HISTTIMEFORMAT="%F %T `whoami` "' >> /etc/bashrc
fi# SSH超时时间
if ! grep "TMOUT=600" /etc/profile &>/dev/null; thenecho "export TMOUT=600" >> /etc/profile
fi# 禁止root远程登录
sed -i 's/#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config# 禁止定时任务向发送邮件
sed -i 's/^MAILTO=root/MAILTO=""/' /etc/crontab# 设置最大打开文件数
if ! grep "* soft nofile 65535" /etc/security/limits.conf &>/dev/null; thencat >> /etc/security/limits.conf << EOF* soft nofile 65535* hard nofile 65535
EOF
fi# 系统内核优化
cat >> /etc/sysctl.conf << EOF
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_tw_buckets = 20480
net.ipv4.tcp_max_syn_backlog = 20480
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_fin_timeout = 20
EOF# 减少SWAP使用
echo "0" > /proc/sys/vm/swappiness# 安装系统性能分析工具及其他
yum install gcc make autoconf vim sysstat net-tools iostat if

⑨ 监控 100 台服务器磁盘利用率脚本

#!/bin/bash
HOST_INFO=host.info
for IP in $(awk '/^[^#]/{print $1}' $HOST_INFO); doUSER=$(awk -v ip=$IP 'ip==$1{print $2}' $HOST_INFO)PORT=$(awk -v ip=$IP 'ip==$1{print $3}' $HOST_INFO)TMP_FILE=/tmp/disk.tmpssh -p $PORT $USER@$IP 'df -h' > $TMP_FILEUSE_RATE_LIST=$(awk 'BEGIN{OFS="="}/^\/dev/{print $NF,int($5)}' $TMP_FILE)for USE_RATE in $USE_RATE_LIST; doPART_NAME=${USE_RATE%=*}USE_RATE=${USE_RATE#*=}if [ $USE_RATE -ge 80 ]; thenecho "Warning: $PART_NAME Partition usage $USE_RATE%!"fidone
done