TrafficReplay
A simple environment to replay the interaction between microservices that run on docker containers
Prerequisites
- jdk8
- git
- maven
- docker and docker-compose
- tshark
- python3
- pip3
- pyshark, pymongo (see requirements.txt)
- go
- libpcap-dev
- mongoreplay
Capturing traffic
Open another terminal and run brctl show. you should see a bridge interface with 5 docker container running on it ( registry, gateway, gateway database, bank account, bank account database).
now run tcpdump -i interface -w capture.pcap where interface is the name of the interface where the container are running.
You can now use the application normally (add bank accounts for example) while the traffic between containers is captured in the capture.pcap file.
Replaying traffic
You can use the scripts in this repository to replay the captured traffic in the capture.pcap file. The current version can only send traffic to the bank account microservice, which runs on port 8081.
first run the script split.sh to split a single capture file in streams:
./split.sh capture.pcap streamsDirectory
in streamsDirectory you now have the single-stream capture files.
to generate a python replay script for each capture file use:
./generate_replay_scripts.sh streamsDirectory
This will use pyshark_test.py to generate a replay script for each capture file in streamsDirectory. However, only the replay scripts for the streams that contain traffic with the microservice which run on 8081 will work.
You can now replay the traffic (if the microservice application is running) by going into streamsDirectory and launching:
python3 stream-X.cap_replay.py
Issues
#TODO
at line 91 in pyshark_test the string packet.http.file_data sometimes presents escaped unicode characters \xa : need to handle this case