Concern public number: IT elder brother, read a dry goods technical article every day, a year later you will find a different self
1.Dos attack Defense (automatically masking attack 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; do if [ $(iptables -vnL |grep -c "$IP") -eq 0 ]; then iptables -I INPUT -s $IP -j DROP echo "$(date +'%F_%T') $IP" >> /tmp/drop_ip.log fi doneCopy the code2. The Linux system sends the alarm script
# yum install mailx
# vi /etc/mail.rc
set [email protected] smtp=smtp.163.com
set [email protected] smtp-auth-password=123456
set smtp-auth=login
Copy the code3. The MySQL database backs up a single cycle
#! /bin/bash DATE=$(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 backup failed!" fi doneCopy the code4.MySQL database backup multiple cycles
#! /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 backup failed!" fi done doneCopy the code5.Nginx access logs are cut by the day
#! /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)Copy the code6.Nginx access log analysis script
#! /bin/bash $remote_addr - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" "$http_x_forwarded_for" LOG_FILE=$1 echo "awk '{a[$1]++}END{print "UV:",length(a); For print v (v in a), a [v]} '$LOG_FILE | sort - k2 - nr | head - 10 echo "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --" echo "statistical period visit most 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 "statistical access of up to 10 page" awk '+ +} {a ($7) END {print "PV: length (a); In a) for (v {the if (a > 10 [v]) print v, a [v]}} '$LOG_FILE | sort - k2 - nr echo "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --" echo "statistical access page state code number" awk '{a[$7" "$9]++}END{for(v in a){if(a[v]>5)print v,a[v]}}'Copy the code7. View the real-time traffic script of the NIC
#! /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 doneCopy the code8. Initialize the server system configuration script
# # / bin/bash to set time zone and synchronization time 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 # disable selinux sed -i '/ selinux / / permissive/disabled / {s}'/etc/selinux/config # close the firewall 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 grep HISTTIMEFORMAT /etc/bashrc; Then echo 'export HISTTIMEFORMAT="%F %T 'whoami' '>> /etc/bashrc fi # SSH timeout if! grep "TMOUT=600" /etc/profile &>/dev/null; Sed -i 's/#PermitRootLogin yes/PermitRootLogin no/' Sed -i 's/^MAILTO=root/MAILTO=""/' /etc/crontab ' grep "* soft nofile 65535" /etc/security/limits.conf &>/dev/null; Then the cat > > / etc/security/limits the conf < < EOF * soft nofiles 65535 * hard nofiles # 65535 EOF fi system kernel optimization 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 # Yum install GCC make autoconf vim sysstat net-tools iostat if /proc/sys/vm/swappiness # yum install GCC make autoconf vim sysstat net-tools iostat ifCopy the code9. Script for monitoring the disk utilization of 100 servers
#! /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 doneCopy the code