Camomile is an implementation of the Kademlia protocol done during the course Mobile and distributed computing systems (D7024E) at Luleå University of Technology.
A short project report with system architecture and a design specification can be found here: doc/d7024e_project_kademlia_report.pdf
| Build status | Test coverage | Camomile docs |
|---|---|---|
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Download and install Protoc into /usr/local:
curl -sfL -o /tmp/protoc.zip https://github.com/protocolbuffers/protobuf/releases/download/v3.9.1/protoc-3.9.1-linux-x86_64.zip
sudo unzip /tmp/protoc.zip -d /usr/local/ # Dangerous!!!
Get dependencies, generate and build the binaries:
go get -u github.com/golang/protobuf/protoc-gen-go
go generate ./...
go build ./cmd/...
Build the Docker container:
docker build . -t dhtnode:latest
Start the cluster script:
./bin/run-cluster.sh <num> # Change <num> to the number of nodes to run.
Done!
| Method | Path | Form Fields | Header | Code | Description |
|---|---|---|---|---|---|
| GET | /{key} | N/A | Origin: {id} | 200 OK | Retrieves a value by its hash key. |
| POST | / | value={value} | Location: /{key} | 202 Accepted | Saves a value in the DHT network. |
| DELETE | /{key} | N/A | N/A | 204 No Content | Orders the DHT network to forget a value. |
ξ curl -iF 'value=ABC, du är mina tankar' 127.0.0.1:8080/
HTTP/1.1 202 Accepted
Location: /bde0e9f6e9d3fabd5bf6849e179f0aee485630f6d5c1c4398517cc1543fb9386
Date: Mon, 07 Oct 2019 13:42:02 GMT
Content-Length: 23
Content-Type: text/plain; charset=utf-8
ABC, du är mina tankar
ξ curl -i 127.0.0.1:8080/bde0e9f6e9d3fabd5bf6849e179f0aee485630f6d5c1c4398517cc1543fb9386
HTTP/1.1 200 OK
Origin: 3a6b713115697a45658aac4ac5eb1714e6f985cb1826d2b5cc53562e2d490157
Date: Mon, 07 Oct 2019 13:42:44 GMT
Content-Length: 23
Content-Type: text/plain; charset=utf-8
ABC, du är mina tankar
ξ curl -iX DELETE 127.0.0.1:8080/bde0e9f6e9d3fabd5bf6849e179f0aee485630f6d5c1c4398517cc1543fb9386
HTTP/1.1 204 No Content
Date: Mon, 07 Oct 2019 13:44:49 GMT
Content-Length: 0
Some nodes logs
sendto: invalid argumentwhen running the cluster script.
Too many nodes running at the same host may result in a "Neighbour Table Overflow". To fix this, increase the kernels internal ARP cache size.
These settings should be enough for a cluster of 50 nodes:
sysctl -w net.ipv4.neigh.default.gc_interval=3600
sysctl -w net.ipv4.neigh.default.gc_stale_time=3600
sysctl -w net.ipv4.neigh.default.gc_thresh1=1024
sysctl -w net.ipv4.neigh.default.gc_thresh2=4096
sysctl -w net.ipv4.neigh.default.gc_thresh3=8192