启动ganglia报错如下所示：
There was an error collecting ganglia data (127.0.0.1:8652): fsockopen error: Connection refused
检查方法：
1、查看启动的httpd、gmetad、gmond是否正常启动。
此处，gmetad没有正常启动，且报错原因如下所示：
[admin@admin02 ~]$ sudo systemctl status gmetad
● gmetad.service - Ganglia Meta Daemon
Loaded: loaded (/usr/lib/systemd/system/gmetad.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Wed 2020-01-08 01:22:15 EST; 9min ago
Process: 2853 ExecStart=/usr/sbin/gmetad -d 1 (code=exited, status=1/FAILURE)
Main PID: 2853 (code=exited, status=1/FAILURE)
Jan 08 01:22:15 admin02 systemd[1]: Started Ganglia Meta Daemon.
Jan 08 01:22:15 admin02 systemd[1]: gmetad.service: main process exited, code=exited, status=1/FAILURE
Jan 08 01:22:15 admin02 systemd[1]: Unit gmetad.service entered failed state.
Jan 08 01:22:15 admin02 gmetad[2853]: Please make sure that /var/lib/ganglia/rrds is owned by ganglia
Jan 08 01:22:15 admin02 systemd[1]: gmetad.service failed.
2、查找到对应的/var/lib/ganglia/rrds路径下，发现该路径下的所属组发生了更改，故执行以下命令，并进行重启。
[admin@admin01 ganglia]$ sudo chown -R ganglia:ganglia rrds/
[admin@admin01 ganglia]$ sudo systemctl restart gmetad
检验校对
发现已经可以正常进行访问
