• 1. Click on the topology map and no graphics information will appear. This error is caused by the lack of GD devel installation treasure;
  

[root@server20 nagios-cn-3.2.3]# yum install /mnt/nagios/gd-devel-2.0.35-11.el6.x86_64.rpm -y

• 403 error occurred when using command to detect httpd service status, which is caused by the requested page does not exist

[root@server20 nagios]# ./libexec/check_http -H 172.25.23.20 -p 80
HTTP WARNING: HTTP/1.1 403 Forbidden - 4184 bytes in 0.000 second response time |time=0.000434s;;;0.000000 size=4184B;;;0

• You need to create a default software release directory

[root@server20 nagios]# touch /var/www/html/index.html
[root@server20 nagios]# chown apache.apache /var/www/html/index.html
[root@server20 nagios]# ./libexec/check_http -H 172.25.23.20 -p 80
HTTP OK: HTTP/1.1 200 OK - 266 bytes in 0.001 second response time |time=0.000536s;;;0.000000 size=266B;;;0

• Start the service httpd,nagios after nagios is configured, use the browser to access, and prompt that URL/nagios does not exist
• Most of this is because apache users do not have access to the nagios directory

[root@server20 nagios]# id apache
uid=48(apache) gid=48(apache) groups=48(apache)
[root@server20 nagios]# usermod -G nagios apache

• There's also a question of no ending

[root@server20 nagios]# ./libexec/check_ping  -H 172.25.23.21 -w 100,20% -c 200,50% -p 5 
/bin/ping
CRITICAL - Could not interpret output from ping command

• The prompt does not explain the output from the ping command. The check ping command is provided by the Nagios plugins plug-in. The options for compiling the plug-in are as follows

(reverse-i-search)`./co': ./configure --with-nagios-user=nagios --enable-extra-opts --enable-libtap --enable-perl-modules --with-cgiurl --with-perl  --with-ping-command=/bin/ping   --with-trusted-path --with-nagios-group=nagios 

• There is a prompt on the Internet that it is because -- with ping command = / bin / Ping is not specified. After I specify this option and recompile and install it again, the error still exists;
• There's another way of saying that it's because of the problem of authority, execution

chmod u+s /bin/ping

• To solve this problem, instead, remove the compile option -- with ping command = / bin / Ping. The software used here is nagios-plugins-2.1.1.tar.gz
• Here are my compilation options

[root@server20 nagios-plugins-2.1.1]# ./configure --with-nagios-user=nagios --enable-extra-opts --enable-libtap --enable-perl-modules --with-cgiurl --with-perl   --with-trusted-path --with-nagios-group=nagios 

• The problem is solved

[root@server20 libexec]# ./check_ping  -H 172.25.23.21 -w 100,20% -c 200,50% -p 5 
PING OK - Packet loss = 0%, RTA = 0.31 ms|rta=0.310000ms;100.000000;200.000000;0.000000 pl=0%;20;50;0

• Browser access shows that ping status is normal