#Usage
Bring up he three test-nodes using vagrant up.
Use chaos.sh <scenario> <machine-id> <arg1> <arg2> ... to launch the different scenarios.
#Tools used
tc
iptables
tcpkill
dmsetup
stress
wrk
#Notes tc qdisc show dev enp0s8
#Demo java -jar /vagrant/shared/counter-demo-assembly-0.1-SNAPSHOT.jar --config /vagrant/shared/target-host1.json java -jar /vagrant/shared/counter-demo-assembly-0.1-SNAPSHOT.jar --config /vagrant/shared/target-host2.json
./chaos.sh 1 net_delay enp0s8 100000 70000 ./chaos.sh 1 net_clear enp0s8 ./chaos.sh 1 net_delay_rate_limit enp0s8 10000 ./chaos.sh 1 net_clear enp0s8 ./chaos.sh 1 net_loss enp0s8 20 ./chaos.sh 1 disk_delay 30000000 500 500
mount /dev/mapper/delay /mnt time touch /mnt/1
badblocks -v /dev/mapper/error
badblocks -v /dev/mapper/stretch--vg-root Checking blocks 0 to 32776191 Checking for bad blocks (read-only test): done Pass completed, 0 bad blocks found. (0/0/0 errors)
#TODO
- Use change for tc if roort already exists to allow stacking and changing of values.
- Integrate ntpdsim
#NTPDSIM ntpdsim was removed from all debian absed distros ... So we need to build it from scratch (best inside one of the vagrant boxes, build is quite fast)
apt-get source ntp
Switch to the now created source-folder.
sudo apt-get install dpkg-dev libtool lynx automake autotools-dev make -y
Create scripts/ntpver.in with the following content (taken from https://github.com/dfc/ntp-mirror/blob/master/scripts/ntpver.in)
#!@CONFIG_SHELL@
# print version string of NTP daemon
# Copyright (c) 1997 by Ulrich Windl
# Modified 970318: Harlan Stenn: rewritten...
# usage: ntpver hostname
ntpq -c "rv 0 daemon_version" $* | @AWK@ '/daemon_version/ { print $2 }'
./bootstrap
./configure --enable-simulator
make
The simulator is now here: ntp/ntpdsim
##Quick example from https://www.eecis.udel.edu/~mills/ntp/html/ntpdsim.html: rm ./ntpstats/* ntpdsim -O 0.1 -C .001 -T 400 -W 1 -c ./ntp.conf,
which starts the simulator with a time offset 100 ms, network jitter 1 ms, frequency offset 400 PPM and oscillator wander 1 PPM/s. These parameters represent typical conditions with modern workstations on a Ethernet LAN. The ntp.conf file should contain something like
disable kernel server pogo driftfile ./ntp.drift statsdir ./ntpstats/ filegen loopstats type day enable filegen peerstats type day enable