CentOS IP Tables?
We don't do much monitoring of servers at the moment, but I received an inquiry about the possibility of monitoring iptables data for a CentOS server. I've looked through modules in the exchange and I'm not seeing much that seems to do this but I was curious if anyone else has ever looked into this. I'm not a server person so I am also not as knowledgeable about how this works as I'd like to be Thank youLinux details for EC2 hosts
Linux details for EC2 hosts such as Kernel version, etc are not displayed, as the Linux_SSH datasource specifically excludes these. I can understand that for some hardware specific properties/info, but it would be useful to have the patch release, etc. of the kernel regardless of being a VM/EC2 in AWS. Is there another datasource or property source I should be using for this info?
Export Netflow from Linux to LogicMonitor
Exporting Netflow from Linux with softflowd NetFlow is an industry standard network protocol for monitoring traffic flows across a network interface. It is used most commonly by devices like firewalls, routers, and switches, but some software packages make it possible to export Netflow data from a server operating system - in this caseLinux (withsoftflowd) - toa Netflow collector (LogicMonitor)for traffic analysis. Ubuntu Documentation here:http://manpages.ubuntu.com/manpages/xenial/man8/softflowd.8.html The following assumes you have an Ubuntu device in your portal which you can access with sudoer permissions. It also assumes Netflow has been enabled for the device and the collector in question. Install softflowd: sudo apt-get install softflowd Open /etc/default/softflowd for editing: sudo nano /etc/default/softflowd Set the value for INTERFACE and add the destination ip:port (<collectorIP>:2055) under OPTIONS. Other options are available, check the link above for full documentation. # # configuration for softflowd # # note: softflowd will not start without an interface configured. # The interface softflowd listens on. You may also use "any" to listen # on all interfaces. INTERFACE= "eth0" # Further options for softflowd, see "man softflowd" for details. # You should at least define a host and a port where the accounting # datagrams should be sent to, e.g. # OPTIONS="-n 127.0.0.1:9995" OPTIONS= "-n 192.168.170.130:2055" Save your changes by pressing Ctrl-O , then exit nano by pressing Ctrl-X . Restart softflowd. sudo service softflowd restart Add a rule to the firewall to allow traffic on 2055. sudo ufw allow 2055 CentOs This is a bit more work since you can't just install a package; you'll need to download the source and compile. Most of the information here comes fromhttps://www.scribd.com/doc/199440303/Cacti-Netflow-Collector-Flowview-and-Softflowd More good info:https://thwack.solarwinds.com/thread/59620 Check to see if you have the compiler installed. which gcc If you don't get /usr/bin/gcc as the response, you'll need to install it. sudo yum install gcc Install libpcap-devel (you'll need this to compile softflowd). sudo yum install libpcap-devel Download the softflowd source. wget https: //storage .googleapis.com /google-code-archive-downloads/v2/code .google.com /softflowd/softflowd-0 .9.9. tar .gz Make sure you're in the directory where you saved the download, then untar the dowloaded source files. tar -xzvf softflowd-0.9.9. tar .gz Switch to the softflowd directory, then run the commands to compile and install it. cd softflowd-0.9.9 . /configure make make install Now we want to have softflowd start when the system boots. We'll need to add a line to the end of /etc/rc.d/rc.local . Use your device's interface after -i and your collector's IP address after -n . sudo nano /etc/rc .d /rc . local <add the following line to the end of the file > /usr/local/sbin/softflowd -i eth0 -n 10.13.37.111:2055 Save your changes with Ctrl-O , exit nano with Ctrl-X . Make sure /etc/rc.d/rc.local is executable. sudo chmod +x /etc/rc .d /rc . local Open port 2055 in the firewall so the collector can receive the data. sudo firewalld-cmd --zone=public --add-port=2055 /tcp --permanent Reboot the machine for all changes to take effect. *Original guide courtesy of@Kurt Huffmanat LogicMonitor