avalancheseqlogger

When you work on custom subnets using avalanche-network-runner, you probably have logs all over the place.
You can have all your logs in one place using centralized logging solutions.

This is a tutorial of how to use Seq.

In this screenshot, you can see the logs from 4 nodes and 2 processes (avalancheGo and SubDotNetVm). You can filter the logs, expand lines to see the structured logs, and there is also a "tail" like mode.

Centralized logging using Seq

I made very minimal modifications to avalanchego (4 lines of code in log/factory.go).

How to run

1) You need to run seq locally.

It's very easy to run seq in your local dev environment using docker.

docker run \
  --name seqtmp \
  -d \
  -e ACCEPT_EULA=Y \
  -v /tmp/seq:/data \
  -p 18080:80 \
  -p 5341:5341 \
  datalust/seq

or if you use podman

podman run \
  --name seqtmp \
  -d \
  -e ACCEPT_EULA=Y \
  -v /tmp/seq:/data:Z \
  -p 18080:80 \
  -p 5341:5341 \
  datalust/seq

2) Clone and build this modified version of avalanchego

In this exemple, we will clone it in /tmp but you can choose any folder you like.

cd /tmp
git clone https://github.com/subdotnet/avalanchego
cd avalanchego
./scripts/build.sh

The compiled binary path is /tmp/avalanchego/build/avalanchego.

3) Install and run avalanche-network-runner

Install using these instructions
You will need two terminals for this :
Start avalanche-network-runner in one terminal

avalanche-network-runner server

Start the nodes in another terminal

avalanche-network-runner control start \
--log-level info \
--number-of-nodes=4 \
--avalanchego-path /tmp/avalanchego/build/avalanchego

4) Watch the logs

Open this url http://localhost:18080/ in your browser