1 、判断当前磁盘剩余空间是否有30G，如果小于30G，则将报警邮件发送给管理员，每天检查-次磁盘剩余空间。
1.1.安装邮件服务
[root@node ~]# df -m
文件系统 1M-块 已用 可用 已用% 挂载点
devtmpfs 700 0 700 0% /dev
tmpfs 716 0 716 0% /dev/shm
tmpfs 287 8 279 3% /run
tmpfs 4 0 4 0% /sys/fs/cgroup
/dev/mapper/openeuler-root 27385 2056 23913 8% /
tmpfs 716 0 716 0% /tmp
/dev/sda1 920 87 770 11% /boot
[root@node ~]# yum install mailx -y
[root@node ~]# vim /etc/mail.rc
set from=3471521632@qq.com
set smtp=smtp.qq.com
set smtp-auth-user=3471521632@qq.com
set smtp-auth-password=anfbowpmrzfdchhi
set smtp-auth=login
注：使用：wq！强制退出1.2.编写脚本
#!/bin/bash
disk=$(df -m | grep -w "/" | tr -s " " | cut -d " " -f4)
if [ $disk -lt 30000 ];then
echo "warning：disk space less than 30G!!!" | mail -s "warning：disk space less than 30G!!!" 3471521632@qq.com
fi
注：df -m 以M为单位显示
grep -w 精准定位
tr -s 压缩空格
1.3.系统计划任务
0 0 * * * root /bin/bash /root/df.sh1.4.测试
发现时间不对 ，没有同步
[root@node ~]# timedatectl
System clock synchronized: no
NTP service: active
RTC in local TZ: no
[root@node ~]# systemctl start chronyd
[root@node ~]# timedatectl
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
再次测试
2、判断web服务是否运行
(1、査看进程的方式判断该程序是否运行2、通过查看端口的方式判断该程序是否运行)
如果没有运行，则启动该服务并配置防火墙规则。
2.1.编写脚本
（脚本名字不要含nginx，否则grep有误）
[root@server ~]# cat ng.sh
#!/bin/bash
ps=$(ps -ef | grep nginx | grep -v grep | wc -l)
#ps=$(netstat -lntup | grep -w 80 | wc -l)
#ps=$(ss -lntup | grep -w 80 | wc -l)
if [ "$ps" -eq 0 ]
then
echo "nginx is stopping, please waiting..."
yum install nginx -y &> /dev/null
systemctl start firewalld
systemctl start nginx
firewall-cmd --permanent --zone=public --add-server=http &> /dev/null
firewall-cmd --permanent --zone=public --add-port=80 &> /dev/null
firewall-cmd --reload > /dev/null
echo "nginx is running"
else
echo "nginx is already running..."
fi
2.2.测试
[root@server ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disa
Active: active (running) since Thu 2024-01-25 03:14:12 CST; 3mi
[root@server ~]# systemctl status nginx
● nginx.service - The nginx HTTP and reverse proxy server
Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled
Active: active (running) since Thu 2024-01-25 03:18:48 CST; 16s
3.用curl命令访问第二题的web服务，看能否正常访问，如果能正常访问，返回web-serveris running;如果不能正常访问，返回12状态码。
3.1.编写脚本
#!/bin/bash
ip=$(ip a | grep ens32 | grep inet | tr -s " " | cut -d " " -f3 | cut -d "/" -f1)
curl -s $ip &> $ip
if [ $? -eq 0 ]
then
echo "web-server is running..."
else
echo "web is not running..."
exit 12
fi
3.2.测试
