1、Dos 攻击防范（自动屏蔽攻击 IP） {#1%E3%80%81dos-%E6%94%BB%E5%87%BB%E9%98%B2%E8%8C%83%EF%BC%88%E8%87%AA%E5%8A%A8%E5%B1%8F%E8%94%BD%E6%94%BB%E5%87%BB-ip%EF%BC%89}

                    
                      #!/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; do
    if [ $(iptables -vnL |grep -c "$IP") -eq 0 ]; then
        iptables -I INPUT -s $IP -j DROP
        echo "$(date +'%F_%T') $IP" >> /tmp/drop_ip.log
    fi
done

                    </code>
                  </pre>



 
2、Linux 系统发送告警脚本 {#2%E3%80%81linux-%E7%B3%BB%E7%BB%9F%E5%8F%91%E9%80%81%E5%91%8A%E8%AD%A6%E8%84%9A%E6%9C%AC}
============================================================================================================


 
``````````shell
                    
                      # 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

                    </code>
                  </pre>



 
3、MySQL 数据库备份单循环 {#3%E3%80%81mysql-%E6%95%B0%E6%8D%AE%E5%BA%93%E5%A4%87%E4%BB%BD%E5%8D%95%E5%BE%AA%E7%8E%AF}
============================================================================================================


 
`````````shell
                    
                      #!/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 $DB_LIST; do
BACKUP_NAME=$BACKUP_DIR/${DB}_${DATE}.sql
if ! mysqldump -h$HOST -u$USER -p$PASS -B $DB \> $BACKUP_NAME 2\>/dev/null; then
echo "$BACKUP_NAME 备份失败!"
fi
done


                    </code>
                  </pre>



 
4、MySQL 数据库备份多循环 {#4%E3%80%81mysql-%E6%95%B0%E6%8D%AE%E5%BA%93%E5%A4%87%E4%BB%BD%E5%A4%9A%E5%BE%AA%E7%8E%AF}
============================================================================================================


 
````````shell
                    
                      #!/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 $DB_LIST; do
BACKUP_DB_DIR=$BACKUP_DIR/${DB}_${DATE}
\[ ! -d $BACKUP_DB_DIR \] \&\& mkdir -p $BACKUP_DB_DIR \&\>/dev/null
TABLE_LIST=$(mysql -h$HOST -u$USER -p$PASS -s -e "use $DB;show tables;" 2\>/dev/null)
for TABLE in $TABLE_LIST; do
BACKUP_NAME=$BACKUP_DB_DIR/${TABLE}.sql
if ! mysqldump -h$HOST -u$USER -p$PASS $DB $TABLE \> $BACKUP_NAME 2\>/dev/null; then
echo "$BACKUP_NAME 备份失败!"
fi
done
done


                    </code>
                  </pre>



 
5、Nginx 访问访问日志按天切割 {#5%E3%80%81nginx-%E8%AE%BF%E9%97%AE%E8%AE%BF%E9%97%AE%E6%97%A5%E5%BF%97%E6%8C%89%E5%A4%A9%E5%88%87%E5%89%B2}
================================================================================================================================


 
```````shell
                    
                      #!/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_DIR
mv $LOG_DIR/$LOG_FILE $LOG_MONTH_DIR/${LOG_FILE}_${YESTERDAY_TIME}
done


kill -USR1 $(cat /var/run/nginx.pid)


                    </code>
                  </pre>



 
6、Nginx 访问日志分析脚本 {#6%E3%80%81nginx-%E8%AE%BF%E9%97%AE%E6%97%A5%E5%BF%97%E5%88%86%E6%9E%90%E8%84%9A%E6%9C%AC}
============================================================================================================


 
``````shell
                    
                      #!/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\[v\]}}'


                    </code>
                  </pre>



 
7、查看网卡实时流量脚本 {#7%E3%80%81%E6%9F%A5%E7%9C%8B%E7%BD%91%E5%8D%A1%E5%AE%9E%E6%97%B6%E6%B5%81%E9%87%8F%E8%84%9A%E6%9C%AC}
====================================================================================================================


 
`````shell
                    
                      #!/bin/bash
NIC=$1
echo -e " In ------ Out"
while true; do
    OLD_IN=$(awk '$0~"'$NIC'"{print $2}' /proc/net/dev)
    OLD_OUT=$(awk '$0~"'$NIC'"{print $10}' /proc/net/dev)
    sleep 1
    NEW_IN=$(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

                    </code>
                  </pre>



 
8、服务器系统配置初始化脚本 {#8%E3%80%81%E6%9C%8D%E5%8A%A1%E5%99%A8%E7%B3%BB%E7%BB%9F%E9%85%8D%E7%BD%AE%E5%88%9D%E5%A7%8B%E5%8C%96%E8%84%9A%E6%9C%AC}
========================================================================================================================================


 
````shell
                    
                      #/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; then
systemctl stop firewalld
systemctl disable firewalld
elif egrep "6.\[0-9\]" /etc/redhat-release \&\>/dev/null; then
service iptables stop
chkconfig iptables off
fi


历史命令显示操作时间
==========



if ! grep HISTTIMEFORMAT /etc/bashrc; then
echo 'export HISTTIMEFORMAT="%F %T `whoami` "' \>\> /etc/bashrc
fi


SSH超时时间
=======



if ! grep "TMOUT=600" /etc/profile \&\>/dev/null; then
echo "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; then
cat \>\> /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


                    </code>
                  </pre>



 
9、监控 100 台服务器磁盘利用率脚本 {#9%E3%80%81%E7%9B%91%E6%8E%A7-100-%E5%8F%B0%E6%9C%8D%E5%8A%A1%E5%99%A8%E7%A3%81%E7%9B%98%E5%88%A9%E7%94%A8%E7%8E%87%E8%84%9A%E6%9C%AC}
============================================================================================================================================================


 
```shell
                    
                      #!/bin/bash
HOST_INFO=host.info
for IP in $(awk '/^[^#]/{print $1}' $HOST_INFO); do
    USER=$(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.tmp
    ssh -p $PORT $USER@$IP 'df -h' > $TMP_FILE
    USE_RATE_LIST=$(awk 'BEGIN{OFS="="}/^\/dev/{print $NF,int($5)}' $TMP_FILE)
    for USE_RATE in $USE_RATE_LIST; do
        PART_NAME=${USE_RATE%=*}
        USE_RATE=${USE_RATE#*=}
        if [ $USE_RATE -ge 80 ]; then
            echo "Warning: $PART_NAME Partition usage $USE_RATE%!"
        fi
    done
done

                    </code>
                  </pre>




```


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