Simulates the latencies among regions and availability zones, just like Amazon EC2.

Linux machine with tc command and python-netifaces installed.

To set the latencies accordingly you will need two CSV files.

The first one provides the latency between pairs of availability zones (clusters), while the second associates the nodes IPs to the corresponding zones.

You can find an example of both files (latencies.csv and ips.csv) under ./doc/sample

To set the latency, simply run:

sudo latency-setter.py set <ip-csv> <latency-csv> <interface-name>

The command will check if the IP address associated with the given interface is in IP file. If so, the latencies will be set according to the latencies file and the zone where the node IP belongs to.

To undo the configuration, run:

sudo latency-setter.py unset <interface-name>

• You must run the commands as root
• Don't forget to undo the changes after running your experiments
• If you want to set the latencies for all the nodes, you can run the command in a loop:

for i in `cut -d , -f 2 <ip-csv>; do
    ssh $i "sudo latency-setter set <ip-csv> <latency-csv> <interface-name>"
done

#you will get an error about the first line because it does not contain a valid IP

Have fun!