废话不多说,直接上干货!
一、运维脚本
(1)监控CPU和内存的使用情况
#!/bin/bash
cpu_threshold=80
mem_threshold=80
# 获取CPU和内存使用率
cpu_usage=$(top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | awk '{print 100 - $1}')
mem_usage=$(free | grep Mem | awk '{print $3/$2 * 100.0}')
# 检查CPU使用率
if (( $(echo "$cpu_usage > $cpu_threshold" | bc -l) )); then
echo "CPU usage is above threshold: $cpu_usage%"
fi
# 检查内存使用率
if (( $(echo "$mem_usage > $mem_threshold" | bc -l) )); then
echo "Memory usage is above threshold: $mem_usage%"
fi
(2)定期备份到指定目录脚本
#!/bin/bash
backup_source="/path/to/source"
backup_dest="/path/to/backup"
timestamp=$(date +"%Y%m%d%H%M")
# 创建备份
tar -czf "$backup_dest/backup_$timestamp.tar.gz" -C "$backup_source" .
# 删除7天前的备份
find "$backup_dest" -type f -name "*.tar.gz" -mtime +7 -exec rm {} \;
(3)自动轮转、压缩和删除旧日志
#!/bin/bash
log_file="/var/log/myapp.log"
max_size=10485760 # 10 MB
if [ -f "$log_file" ]; then
log_size=$(stat -c%s "$log_file")
if [ "$log_size" -ge "$max_size" ]; then
mv "$log_file" "$log_file.old"
touch "$log_file"
gzip "$log_file.old"
fi
fi
(4)磁盘监控脚本
#!/bin/bash
threshold=90
df -H | awk '{if ($5 > threshold) print $0}' | while read line; do
echo "Disk space alert: $line"
done
二、常用其他脚本
(1)输出不同颜色的提示语
#打印不同颜色方法
echo_color() {
if [ $1 == "green" ]; then
echo -e "\033[32;40m$2\033[0m"
elif [ $1 == "red" ]; then
echo -e "\033[31;40m$2\033[0m"
elif [ $1 == "yellow" ]; then
echo -e "\033[33;40m$2\033[0m"
elif [ $1 == "blue" ]; then
echo -e "\033[34;40m$2\033[0m"
fi
}
(2)检测IP格式合规性
# 函数:检测IP格式
is_valid_ip() {
local ip="$1"
[[ "$ip" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]] && return 0 || return 1
}
(3)检测端口合规性
# 函数:检测端口号
is_valid_port() {
local port="$1"
[[ "$port" =~ ^[0-9]+$ ]] && [ "$port" -ge 1 ] && [ "$port" -le 65535 ] && return 0 || return 1
}
(4)检测某端口是否已存在
check_port(){
check_port=$1
check_result="$(netstat -tunlp|grep -w ${check_port} |awk '{print $7}'|cut -d/ -f1)"
if [[ -n "$check_result" ]];then
echo "$check_port端口已被占用"
exit 1
else
echo "端口:$check_port,可用"
fi
}
(5)设置某个服务开机自启动
#根据服务名称设置服务开机自启动
set_service_on(){
service_name=$1
chmod 644 /lib/systemd/system/${service_name}.service
chown root:root /lib/systemd/system/${service_name}.service
systemctl daemon-reload
systemctl restart ${service_name}
systemctl enable ${service_name}
}
(6)获取当前服务器时间(标准格式)
time=`date "+%Y-%m-%d^%H:%M:%S"`
(7)检查服务在线状态(端口和进程)
#被检测服务的端口号
PORT="10000"
#被检测服务的java程序
COUNT="$(ps -ef|grep "xxxxxxxxxxxxxxxxx.jar"|grep -v grep|wc -l)"
if [[ -n "$PORT" ]];then
echo "服务正常启动"
elif [[ $COUNT -eq 1 ]]; then
echo "服务正在启动中,请稍后... ..."
else
echo "服务异常,请重启服务"
fi
(8)执行简单的定时任务
while true; do
echo "Running task at $(date)"
sleep 60 # 每60秒执行一次
done
(9)并行执行多个命令
{
sleep 2
echo "Task 1 completed"
} & {
sleep 3
echo "Task 2 completed"
}
wait # 等待所有后台任务完成
echo "All tasks completed."
(10)使用条件语句进行文件(文件夹)判别
if [ -f "myfile.txt" ]; then
echo "File exists."
elif [ -d "mydir" ]; then
echo "It's a directory."
else
echo "File or directory does not exist."
fi
若有需要帮忙写的Shell脚本,可以留言!