In this sample, Nagios monitors remote Linux host via the plugin named ‘check_nrpe’. And the NRPE package needs to be installed on the remote Linux host, as it works as the Nagios Linux agent. * The following configurations need to be done on the remote Linux/Unix host: 1) Install prerequisite packages. yum install -y gcc … Continue reading Nagios: Monitoring Linux
Nagios Installation
Today is the first day of my new job. I am currently working as a system/network administrator in a data center of a global organization. The first task I got is something on Nagios. I did not use Nagois before. Instead, I am pretty familiar with a similar product named WhatsUp Gold. I believe the … Continue reading Nagios Installation
How Google Search Works
How Google Search Works
FTP Active Mode vs. Passive Mode
Continue with my previous post. Now my friend should understand why the solution I gave to him fixed the FTP issue. I illustrated how FTP protocal works in both active and passive mode as below. The biggest difference is which side initiates the data transfer session: In active mode, FTP server initiates the data transfer … Continue reading FTP Active Mode vs. Passive Mode
Passive Mode Settings In FileZilla
My friend called me the other day and asked me to help him troubleshoot the FTP server which runs in his office LAN. The problem is that the outside FTP user is able to connect the FTP server and pass the authentication, but just can not download the files from the server. OK. It sounds … Continue reading Passive Mode Settings In FileZilla
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