1、There was an error collecting ganglia data (127.0.0.1:8652): fsockopen error: Permission denied

原因，apache用户无法访问rrd目录，执行journalctl -xe命令有提示

Mar 15 12:13:33 hadoop-n /usr/local/ganglia/sbin/gmetad[6215]: Please make sure that /var/lib/ganglia/rrds is owned by nobody

将rrd目录的所有者和权限组改成nobody后解决

2，Starting GANGLIA gmetad: /usr/sbin/gmetad: error while loading shared libraries: librrd.so.4: cannot open shared object file: No such file or directory

执行

ln -s /usr/local/lib/librrd.so.4 /lib64