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https://github.com/peter-mcconnell/dilih
simple ebpf chaos engineering tool meant to demonstrate how easy building an eBPF project can be
https://github.com/peter-mcconnell/dilih
bpf chaos-engineering golang
Last synced: about 1 month ago
JSON representation
simple ebpf chaos engineering tool meant to demonstrate how easy building an eBPF project can be
- Host: GitHub
- URL: https://github.com/peter-mcconnell/dilih
- Owner: peter-mcconnell
- License: lgpl-3.0
- Created: 2023-05-16T13:38:58.000Z (over 1 year ago)
- Default Branch: master
- Last Pushed: 2023-05-17T21:13:18.000Z (over 1 year ago)
- Last Synced: 2024-06-21T19:06:29.956Z (6 months ago)
- Topics: bpf, chaos-engineering, golang
- Language: Go
- Homepage:
- Size: 155 KB
- Stars: 10
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.md
Awesome Lists containing this project
README
dilih
=====
A simple example project that shows how to build XDP eBPF programs in C and load them with Golang; accompanying article: https://www.petermcconnell.com/posts/writing-an-xdp-ebpf-program/.
This program will drop ~50% of packets on a given interface, allowing you to inspect the impact faulty network has on your applications. Note: you can also accomplish this functionality with `tc`.
_drop it like it's hot_
build dependencies
------------------
This project was built and tested in the following environment:
```
- x86_64
- linux kernel 5.15.0-71-generic
- llvm 16.0.3 with -bpf target support (https://github.com/peter-mcconnell/.dotfiles/blob/master/tasks/llvm.yaml)
- clang 16.0.3 (https://github.com/peter-mcconnell/.dotfiles/blob/master/tasks/llvm.yaml)
- golang go1.20.2 (https://github.com/peter-mcconnell/.dotfiles/blob/master/tasks/golang.yaml)
- docker 23.0.1 (https://github.com/peter-mcconnell/.dotfiles/blob/master/tasks/docker.yaml)
- make 4.3
```
build everything (bpf program, go program, docker image)
--------------------------------------------------------
If you haven't already, ensure the libbpf submodule is pulled:
```sh
$ git submodule init
$ git submodule update
```
Then proceed to build:
```sh
$ make
```
running with docker
-------------------
```sh
# set DEV= to your device (check 'ip link')
$ DEV=eth0 make run_docker
# press Ctrl+C when you want to resume normality
```
Or you can run the image from docker hub (no need to pull this repo):
```sh
# set INTERFACE= to your device (check 'ip link')
docker run --net=host --cap-add SYS_ADMIN -u0 -e INTERFACE=ens160 --rm pemcconnell/dilih:v0.0.1-pre
```
testing
-------
With the program running you should start to see disruption. For example, when applied to the hosts interface used for the internet connection we can see ~50% packet loss:
```sh
$ ping -c8 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=3 ttl=115 time=20.6 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=115 time=28.1 ms
64 bytes from 8.8.8.8: icmp_seq=7 ttl=115 time=20.8 ms
64 bytes from 8.8.8.8: icmp_seq=8 ttl=115 time=21.8 ms
--- 8.8.8.8 ping statistics ---
8 packets transmitted, 4 received, 50% packet loss, time 7073ms
rtt min/avg/max/mdev = 20.557/22.809/28.085/3.078 ms
```
_Note: it may not actually be 50% each time - the logic depends on randomness._
clean
-----
```sh
$ DEV=eth0 make clean
```