By Wojciech Kocjan
From the technical standpoint the booklet is definitely written. i might even enterprise to claim the booklet is superb for individuals simply stepping into Nagios tracking, because it is going from a uncomplicated arrange to on-fly configuration transformations with occasion handlers. i might, if basically the ebook wasn't missing a lot by way of enhancing. i am sorry to assert that, however the variety of poorly phrased sentences is greatly excessive, specially for a UK-based publishing corporation. from time to time I needed to re-read a sentence a few times simply to comprehend what's approximately, which makes it a section demanding to learn yet you may get used to it, and should you do you will get loads of precious details from this book.
Although in my view this books yearns for a few enhancing i will be able to (with a transparent moral sense) suggest it to someone deploying Nagios in his IT atmosphere. whether you have already got a operating Nagios configuration you are going to most likely bump into a few strong rules right here that can assist you make it extra maintainable or just extra fitted to your company wishes. i do know I did.
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Additional resources for Learning Nagios 3.0
For different operating systems, the packages are similar though they may have different names. 8 libnet-snmp-perl Package names may also be different for other operating systems and distributions. The command to install corresponding packages may also be different. For RPM packages, the naming convention is a bit different—the development packages have a suffix of devel. Libraries themselves are also named in a slightly different manner. For Red Hat Enterprise Linux and Fedora Core operating systems with yum installed, the command to install all prerequisites would be: yum install gcc imake binutils cpp postgresql-devel \ libmysql15lib mysql15-devel \ openssl openssl-devel pkg-config httpd \ libgd2 libgd2-devel libgd-progs libpng libpng-devel \ libjpeg libjpeg-devel perl perl-devel perl-Net-SNMP [ 19 ] This material is copyright and is licensed for the sole use by Muhammad Azhar on 18th May 2009 331, North Bridge Road, #18-03/05, Odeon Towers, Singapore 188720, Singapore, Singapore, 188720 Installation and Configuration A system with the development packages already installed, usually, contains all the packages needed to build Nagios.
For example, if a router is down, then all machines accessed through it are considered unreachable and no tests will be performed on them. If your network consists of servers connected via a switch and routers to a different network, then the parent for all of the servers in the local network, as well as the router, would be the switch. The parent of the router on the other side of the link would be the local router. The following diagram shows the actual network infrastructure and indicates how Nagios hosts should be configured in terms of parents for each element of the network: nagios 1 ftpserver nagios 1 webserver switch 1 router 1 switch 1 router 2 ftpserver mailserver router 1 switch 2 router 2 databaseserver switch 2 mailserver webserver databaseserver [ 37 ] This material is copyright and is licensed for the sole use by Muhammad Azhar on 18th May 2009 331, North Bridge Road, #18-03/05, Odeon Towers, Singapore 188720, Singapore, Singapore, 188720 Installation and Configuration The actual network topology is shown on the left, and the parent hosts setup for the machines is shown on the right.
Even though some devices, such as switches, cannot be easily checked to see if they are down, it is still a good idea to describe them as a part of your topology. In this case, you might use a functionality such as scheduled downtime to keep track of when the device is going to be offline, or mark it as DOWN manually. This helps in determining other problems—Nagios will not scan hosts that have the router somewhere along the path that is currently scheduled for downtime. This way, you won't be flooded with notifications on actually unreachable hosts being down.