narutaro

cron does not work with rbenv?

If your cron does not work, in many cases, that's because enviromental value.

Check your environmental values

You use rbenv and created some ruby scripts. Now you want to set it to cron.

43 19 * * * ruby your_ruby_script.rb

narutaro

Grumbles of a rubyist who tries to learn python

Create a unique list of lists/array of arrays - the winner is ruby

ruby

[1] pry(main)> a = [[1, 2],[1,2],[3,4]]
=> [[1, 2], [1, 2], [3, 4]]
[2] pry(main)> a.uniq
=> [[1, 2], [3, 4]]

narutaro

write a read-only file after modifiying some

:w !sudo tee % > /dev/null

narutaro

Gistlog supports github markdown style table. A table looks like this.

ft-Aligned	Center Aligned	Right Aligned
col 3 is	some wordy text	$1600
col 2 is	centered	$12
zebra stripes	are neat	$1

narutaro

nprobe --collector-port 6789 --dump-path /nprobe

narutaro

The best NetFlow generator flowgen

me@vaio:~/NetFlow-Generator$ time ./flowgen -p 5555 -i 1 --dstaddr 1.1.1.1 -n 1000000 10.40.8.240 
collector = 10.40.8.240
count     = 1000000
spoof     = (none)
port      = 5555
wait      = 0 (msec)
interval = 1

narutaro

Usage

root@tcpreplay:/tcpreplay# tcpreplay -i eth0 -K --mbps 10 smallFlows.pcap 
File Cache is enabled
Actual: 14261 packets (9216531 bytes) sent in 7.03 seconds.
Rated: 1249999.6 Bps, 9.99 Mbps, 1934.15 pps
Flows: 1209 flows, 163.97 fps, 14243 flow packets, 18 non-flow
Statistics for network device: eth0
	Attempted packets:         14261
	Successful packets: 14261

narutaro

#Symptom

# gem install rest-client
Fetching: unf_ext-0.0.7.1.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing rest-client:
	ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9.1 extconf.rb

narutaro

#Preparing a docker container

Use a docker container to setup pmacct. Port 5678/udp for receiving NetFlow.

$ docker run -d -h pmacct --name=pmacct -p 8889:8889 -p 5678:5678/udp -v /home/inoue/docker/pmacct:/pmacct -it ubuntu

Build essentials.

apt-get install build-essential checkinstall

narutaro

#Open source NetFlow collector ##Over ten years players ###nfsen family - nfpcapd nfsen has very stable and well-accumulated feature set. It provides full-stack of NetFlow feature. NetFlow collector daemon nfpcapd, flow dump file operation tool nfdump and Web front-end nfsen. Community is still avtive.

###ntop-ng family - nprobe

###pmacct family- pmacctd Momory table is something that I want to try.