#!/bin/bash
#memory use
mem_war_file=/tmp/mem_war.txt
mem_use=`free -m | grep Mem | awk '{print $3}'`
mem_total=`free -m | grep Mem | awk '{print $2}'`
mem_percent=$((mem_use*100/mem_total))
# echo "$mem_percent"%
if (($mem_percent > 80));then
echo "`date +%F-%H-%M` mem: ${mem_percent}%" >$mem_war_file
echo "`date +%F-%H-%M` mem: ${mem_percent}%" | mail -s "mem warning" root
fi
#!/bin/bash
#######################################################
#检测网卡流量，并按规定格式记录在日志中
#规定一分钟记录一次
#日志格式如下所示:
#2021-07-08 18:55
#eth0 input: 1234bps
#eth0 output: 1235bps
######################################################3
while :
do
#设置语言为英文，保障输出结果是英文，否则会出现bug
LANG=en
logfile=/tmp/`date +%d`.log
#将下面执行的命令结果输出重定向到logfile日志中
exec >> $logfile
date +"%F %H:%M"
#sar命令统计的流量单位为kb/s，日志格式为bps，因此要*1000*8
sar -n DEV 1 59|grep Average|grep eth0|awk '{print $2,"\t","input:","\t",$5*1000*8,"bps","\n",$2,"\t","output:","\t",$6*1000*8,"bps"}'
echo "####################"
#因为执行sar命令需要59秒，因此不需要sleep
done
假设服务器为lnmp环境，近期访问经常出现502现象，且502错误在重启php-fpm服务后消失，因此编写监控脚本，一旦出现502，则自动重启php-fpm服务。
#场景：
#1.访问日志文件的路径：/data/log/access.log
#2.脚本死循环，每10秒检测一次，10秒的日志条数为300条，出现502的比例不低于10%（30条）则需要重启php-fpm服务
#3.重启命令为：/etc/init.d/php-fpm restart
#!/bin/bash
###########################################################
#监测Nginx访问日志502情况，并做相应操作
###########################################################
log=/data/log/access.log
N=30 #设定阈值
while :
do
#查看访问日志的最新300条，并统计502的次数
err=`tail -n 300 $log |grep -c '502" '`
if [ $err -ge $N ]
then
/etc/init.d/php-fpm restart 2> /dev/null
#设定60s延迟防止脚本bug导致无限重启php-fpm服务
sleep 60
fi
sleep 10
done
#!/bin/bash
HOST=$1
PORT="22 80 8080 3306"
for PORT in $PORT; do
if echo &>/dev/null > /dev/tcp/$HOST/$PORT; then
echo "$PORT open"
else
echo "$PORT close"
fi
done
#!/bin/bash
#####################################
#检测两台服务器指定目录下的文件一致性
#####################################
#通过对比两台服务器上文件的md5值，达到检测一致性的目的
dir=/data/web
b_ip=192.168.88.10
#将指定目录下的文件全部遍历出来并作为md5sum命令的参数，进而得到所有文件的md5值，并写入到指定文件中
find $dir -type f|xargs md5sum > /tmp/md5_a.txt
ssh $b_ip "find $dir -type f|xargs md5sum > /tmp/md5_b.txt"
scp $b_ip:/tmp/md5_b.txt /tmp
#将文件名作为遍历对象进行一一比对
for f in `awk '{print 2} /tmp/md5_a.txt'`
do
#以a机器为标准，当b机器不存在遍历对象中的文件时直接输出不存在的结果
if grep -qw "$f" /tmp/md5_b.txt
then
md5_a=`grep -w "$f" /tmp/md5_a.txt|awk '{print 1}'`
md5_b=`grep -w "$f" /tmp/md5_b.txt|awk '{print 1}'`
#当文件存在时，如果md5值不一致则输出文件改变的结果
if [ $md5_a != $md5_b ]
then
echo "$f changed."
fi
else
echo "$f deleted."
fi
done
#!/bin/bash ################################################################ #每小时执行一次脚本（任务计划），当时间为0点或12点时，将目标目录下的所有文件内容清空，但不删除文件，其他时间则只统计各个文件的大小，一个文件一行，输出到以时间和日期命名的文件中，需要考虑目标目录下二级、三级等子目录的文件 ################################################################ logfile=/tmp/`date +%H-%F`.log n=`date +%H` if [ $n -eq 00 ] || [ $n -eq 12 ] then #通过for循环，以find命令作为遍历条件，将目标目录下的所有文件进行遍历并做相应操作 for i in `find /data/log/ -type f` do true > $i done else for i in `find /data/log/ -type f` do du -sh $i >> $logfile done fi
#!/usr/bin/bash
# check host status
for i in {1..254}
do
{
ip=192.168.8.$i
ping -c 2 -W 1 $ip &>/dev/null
if [ $? -eq 0 ];then
echo "$ip is online" | tee -a /tmp/host_online.txt
else
# echo "$ip is offline" | tee -a /tmp/host_offline.txt
echo "$ip is offline" &>/dev/null
fi
}&
done
wait
#!/usr/bin/bash
# ssh keygen
>ip_ok.txt
>ip_false.txt
user=root
passwd=123456
rpm -qa | grep expect &>/dev/null
if [ $? -ne 0 ];then
echo "expect is not install"
yum -y install expect
fi
if [ ! -f ~/.ssh/id_rsa ];then
ssh-keygen -P "" -f ~/.ssh/id_rsa
fi
for i in {15..30}
do
{
ip=192.168.1."$i"
ping -c 1 -W1 "$ip"
if [ $? -eq 0 ];then
echo "$ip" >> ip_ok.txt
/usr/bin/expect <<-EOF
spawn ssh-copy-id $user@$ip
expect {
"yes/no" { send "yes\r"; exp_continue }
"password:" { send "$passwd\r" };
}
expect eof
EOF
else
echo "$ip" >>ip_false.txt
fi
}&
done
wait
echo "finish"
#!/bin/bash
# code online
# author: ren
PROJT_DIR=/usr/local/nginx/html
OLD_DIR=/usr/local/nginx/html/web1
PROJT=web1
BACKUP_DIR=/data/backup
DATA_CHMOD=www
DATE=`date +%F`
NEW_DIR=/data/web1
# 关闭nginx
function stop_nginx() {
/usr/bin/systemctl stop nginx
if [ $? -eq 0 ];then
echo "nginx is stopd"
else
echo "nginx is not stop please check..."
exit 1
fi
}
#2 备份原有数据
function backup_data() {
if [ -d $BACKUP_DIR/$DATE'-'$PROJT ];then
echo "DIR $BACKUP_DIR/$DATE'-'$PROJT is exist"
exit 2
else
mv $OLD_DIR $BACKUP_DIR/$DATE'-'$PROJT
fi
}
# 3移动新的代码 项目目录 注：此代码目录需手动上传解压
function new_code() {
if [ -d $NEW_DIR ];then
mv $NEW_DIR $PROJT_DIR
else
echo "NEW_DIR is not exist"
exit 3
fi
}
# 4 修改权限
function chmod_news() {
chown -R $DATA_CHMOD.$DATA_CHMOD $OLD_DIR
}
# 5 启动服务
function start_nginx() {
/usr/bin/systemctl start nginx
if [ $? -eq 0 ];then
echo "nginx start ok"
else
echo "ngin is not start,please check..."
fi
}
stop_nginx
backup_data
new_code
chmod_news
start_nginx
#!/bin/bash
user="root"
password="123456"
mycmd="mysql -u$user -p$password -h 192.168.1.88"
function chkdb() {
list=($($mycmd -e "show slave status \G"|egrep "Running|Behind"|awk -F: '{print $2}'))
if [ ${list[0]} = "Yes" -a ${list[1]} = "Yes" -a ${list[2]} -lt 120 ]
then echo "Mysql slave is ok"
else echo "Mysql slave replation is filed"
fi
}
function main() {
while true
do chkdb
sleep 3
done
}
main
#!/bin/bash
#删除15天以前备份
source /etc/profile #加载系统环境变量
source ~/.bash_profile #加载用户环境变量
set -o nounset #引用未初始化变量时退出
#set -o errexit #执行shell命令遇到错误时退出
user="root"
password="123456"
host="localhost"
port="3306"
#需备份的数据库，数组
db=("test")
#备份时加锁方式，
#MyISAM为锁表--lock-all-tables，
#InnoDB为锁行--single-transaction
lock="--single-transaction"
mysql_path="/usr/local/mysql"
backup_path="${mysql_path}/backup"
date=$(date +%Y-%m-%d_%H-%M-%S)
day=15
backup_log="${mysql_path}/backup.log"
#建立备份目录
if [ ! -e $backup_path ];then
mkdir -p $backup_path
fi
#删除以前备份
find $backup_path -type f -mtime +$day -exec rm -rf {} \; > /dev/null 2>&1
echo "开始备份数据库：${db[*]}"
#备份并压缩
backup_sql(){
dbname=$1
backup_name="${dbname}_${date}.sql"
#-R备份存储过程，函数，触发器
mysqldump -h $host -P $port -u $user -p$password $lock --default-character-set=utf8 --flush-logs -R $dbname > $backup_path/$backup_name
if [[ $? == 0 ]];then
cd $backup_path
tar zcpvf $backup_name.tar.gz $backup_name
size=$(du $backup_name.tar.gz -sh | awk '{print $1}')
rm -rf $backup_name
echo "$date 备份 $dbname($size) 成功 "
else
cd $backup_path
rm -rf $backup_name
echo "$date 备份 $dbname 失败 "
fi
}
#循环备份
length=${#db[@]}
for (( i = 0; i < $length; i++ )); do
backup_sql ${db[$i]} >> $backup_log 2>&1
done
echo "备份结束,结果查看 $backup_log"
du $backup_path/*$date* -sh | awk '{print "文件:" $2 ",大小:" $1}'
