We wanted to verify whether the sharing created by running on a virtual machine made any statistical difference to the PingER results. Thus we compare the results from PinGER running on a bare metal machine (pinger.slac.stanford.edu) vs running on a VM.
Spin up the virtual machine.
Install pinger2.pl
Verify installation
These are CGI scripts to enable a reverse traceroute and ping server (traceroute.pl), and to enable the gathering of data (ping_data.pl) from the archive sites. The two scripts were installed in the standard CGI script location /var/www/cgi-bin as defined in /etc/httpd/conf/http.conf. They are accessible from within SLAC as: http://dhcp-nebula-124-66.slac.stanford.edu/cgi-bin/ping_data.pl and http://dhcp-nebula-124-66.slac.stanford.edu/cgi-bin/traceroute.pl. Since they are on port 80 there is no access to the web server from offiste.
To ensure the web server (Apache) restarts after a reboot I also had to issue:
[cottrell@dhcp-nebula-priv-52-7 ~]$ sudo -s [sudo] password for cottrell: [root@dhcp-nebula-priv-52-7 cottrell]# /sbin/chkconfig httpd on [root@dhcp-nebula-priv-52-7 cottrell]# /etc/init.d/httpd restart Stopping httpd: [FAILED] Starting httpd: [ OK ] [root@dhcp-nebula-priv-52-7 cottrell]# ps -efl | grep httpd 1 S root 3056 1 0 80 0 - 46710 poll_s 07:42 ? 00:00:00 /usr/sbin/httpd 5 S apache 3058 3056 0 80 0 - 46710 inet_c 07:42 ? 00:00:00 /usr/sbin/httpd 5 S apache 3059 3056 0 80 0 - 46710 inet_c 07:42 ? 00:00:00 /usr/sbin/httpd 5 S apache 3060 3056 0 80 0 - 46710 inet_c 07:42 ? 00:00:00 /usr/sbin/httpd 5 S apache 3061 3056 0 80 0 - 46710 inet_c 07:42 ? 00:00:00 /usr/sbin/httpd 5 S apache 3062 3056 0 80 0 - 46710 inet_c 07:42 ? 00:00:00 /usr/sbin/httpd 5 S apache 3063 3056 0 80 0 - 46710 inet_c 07:42 ? 00:00:00 /usr/sbin/httpd 5 S apache 3064 3056 0 80 0 - 46710 inet_c 07:42 ? 00:00:00 /usr/sbin/httpd 5 S apache 3065 3056 0 80 0 - 46710 inet_c 07:42 ? 00:00:00 /usr/sbin/httpd 0 S root 3083 3029 0 80 0 - 26328 pipe_w 07:46 pts/0 00:00:00 grep httpd |
See here
Yee reconfigured the VM to use a fixed address. The IP address is now 172.23.52.7. This host can only be seen from SLAC. I changed the SLAC beacons list this host points to so it only monitors pinger.slac.stanford.edu.
I changed the /usr/local/share/pinger/pinger.xml file to only ping the single beacon pinger.slac.stanford.edu and to point to the above beacon list at http://www-iepm.slac.stanford.edu/pinger/beacons-pingervm.txt
I changed the file /afs/slac.stanford.edu/package/pinger/pinger2/share/pinger/pinger.xml from pointing to here to pointing to here in the <HostList>
Traceroutes from pinger to pingervm and from pingervm to pinger