运行环境：
操作系统：
[root@sky9896 cacti]# cat /etc/redhat-release
CentOS release 6.8 (Final)
Web中间件：
[root@sky9896 cacti]# httpd -v
Server version: Apache/2.2.15 (Unix)
Server built: Nov 18 2016 23:48:55
开源监控：Cacti
问题如下图所示：
问题分析：检查配置文件、查看后台数据库账号都没有问题，类似这种问题，先查看Apache和Cacti运行日志。
由于一台普通电脑承担Cacti服务，要考虑磁盘空间问题。
[root@sky9896 cacti]# df -hl
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 49G 46G 623M 99% /
tmpfs 939M 2.9M 936M 1% /dev/shm
/dev/sda1 93M 54M 35M 61% /boot
/dev/sda5 179G 2.3G 168G 2% /home
#查找系统中大于1G以上的文件
[root@sky9896 logs]# find / -size +1000000k -type f|xargs ls -hl
-rw-r----- 1 mysql mysql 4.5G 12月 25 15:18 /var/log/mysqld.log
-rw-r--r-- 1 root root 9.6G 12月 20 2015 /var/www/html/20151220cacti/log/cacti.log
-rw-r--r-- 1 root root 12G 12月 25 15:26 /var/www/html/cacti/log/cacti.log
-rw-r--r-- 1 root root 1.7G 12月 7 2016 /var/www/html/cacti.tar
[root@sky9896 log]# tail -n 10 cacti.log
12/25/2018 03:26:18 PM - CMDPHP: Poller[0] Host[7] DS[95] WARNING: Result from CMD not valid. Partial Result: Can't connect to MyS
12/25/2018 03:26:18 PM - CMDPHP: Poller[0] Host[7] DS[96] WARNING: Result from CMD not valid. Partial Result: Can't connect to MyS
12/25/2018 03:26:19 PM - THOLD: Checking Threshold:'Linux_Server - Logged in Users [users]', Graph:'216'
12/25/2018 03:26:21 PM - SYSTEM STATS: Time:19.1110 Method:cmd.php Processes:5 Threads:N/A Hosts:8 HostsPerProcess:2 DataSources:138 RRDsProcessed:43
12/25/2018 03:26:21 PM - THOLD: Checking Threshold: DS:established RRA_ID:20 DATA_ID:163 VALUE:3
12/25/2018 03:26:21 PM - THOLD: Threshold HI / Low check is normal HI:10 LOW: VALUE:3
12/25/2018 03:26:21 PM - THOLD: Checking Threshold: DS:users RRA_ID:268 DATA_ID:1077 VALUE:1
12/25/2018 03:26:21 PM - THOLD: Threshold HI / Low check is normal HI:5 LOW: VALUE:1
12/25/2018 03:26:21 PM - SYSTEM THOLD STATS: Time:0.0187 Tholds:2 TotalHosts:7 DownHosts:3 NewDownHosts:0
12/25/2018 03:26:21 PM - SYSTEM SYSLOG STATS:Time:0.08 Deletes:0 Incoming:0 Removes:0 XFers:0 Alerts:0 Alarms:0 Reports:0
[root@sky9896 log]# ll
总用量 12117468
drwxr-xr-x 2 root root 4096 3月 28 2017 1.log
-rw-r--r-- 1 root root 12407863339 12月 25 15:30 cacti.log
[root@sky9896 log]# rm cacti.log
rm：是否删除普通文件 "cacti.log"？y
[root@sky9896 log]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 49G 34G 13G 74% /
tmpfs 939M 3.0M 936M 1% /dev/shm
/dev/sda1 93M 54M 35M 61% /boot
/dev/sda5 179G 2.3G 168G 2% /home
[root@sky9896 logs]# pwd
/etc/httpd/logs
[root@sky9896 logs]# tail -n 5 access_log
- - [25/Dec/2018:15:34:03 +0800] "GET /server-status?auto HTTP/1.0" 403 280 "-" "-"
- - [25/Dec/2018:15:34:03 +0800] "GET /server-status?auto HTTP/1.0" 403 280 "-" "-"
- - [25/Dec/2018:15:34:03 +0800] "GET /server-status?auto HTTP/1.0" 403 280 "-" "-"
- - [25/Dec/2018:15:34:03 +0800] "GET /server-status?auto HTTP/1.0" 403 280 "-" "-"
- - [25/Dec/2018:15:34:03 +0800] "GET /server-status?auto HTTP/1.0" 403 280 "-" "-"
[root@sky9896 logs]# tail -n 5 error_log
[Tue Dec 25 15:34:03 2018] [error] [client ] client denied by server configuration: /var/www/html/server-status
[Tue Dec 25 15:34:03 2018] [error] [client ] client denied by server configuration: /var/www/html/server-status
[Tue Dec 25 15:34:03 2018] [error] [client ] client denied by server configuration: /var/www/html/server-status
[Tue Dec 25 15:34:03 2018] [error] [client ] client denied by server configuration: /var/www/html/server-status
[Tue Dec 25 15:34:03 2018] [error] [client ] client denied by server configuration: /var/www/html/server-status