Combining/interleaving output from multiple hosts

[andyjeffries]

Would be great if there was a way of doing something like this:

kamal logs -f -r web

And having it tail the web containers across all hosts, preceeding each line with the hostname/container name (in a different colour) of each one.

I understand there are companies like Basecamp where the scale would make this unweildy, but for smaller uses (think a couple of servers each, for a couple of different roles) this is super useful. I used Kubetail in the Kubernetes world before we moved over to deploying via Kamal.

Maybe there's something already out there that we can use (or wrap)?

[andyjeffries]

If anyone else comes across this issue, here's a bash script to do it:

#!/bin/bash

# Define the list of servers
servers=(
  "user@web1.example.com"
  "user@web2.example.com"
  # Add more servers as needed
)

# Function to clean up background processes
cleanup() {
  echo "Cleaning up..."
  for pid in "${pids[@]}"; do
    kill "$pid" 2>/dev/null
  done
}

# Trap the EXIT signal to run the cleanup function
trap cleanup EXIT

# Array to hold the process IDs of background jobs
pids=()

for server in "${servers[@]}"; do
  # Replace yourorg/project with your Docker image name
  ssh "$server" "docker ps | grep 'yourorg/project' | awk '{print \$1}' | xargs -r docker logs -f 2>&1 | sed 's/^/[$server] /'" &
  pids+=($!)
done

# Wait for all background jobs to finish
wait