HAProxy Sticky Sessions

Setup

Standalone

Start-Job -Name SERVICE_A -ScriptBlock {
    Set-Location $Using:PWD
    $Env:SERVICE_NAME = "A"
    $Env:SERVICE_PORT = "8080"
    npm start
}

Start-Job -Name SERVICE_B -ScriptBlock {
    Set-Location $Using:PWD
    $Env:SERVICE_NAME = "B"
    $Env:SERVICE_PORT = "8082"
    npm start
}

Start-Job -Name SERVICE_C -ScriptBlock {
    Set-Location $Using:PWD
    $Env:SERVICE_NAME = "C"
    $Env:SERVICE_PORT = "8083"
    npm start
}

Receive-Job -Name SERVICE_A
Receive-Job -Name SERVICE_B
Receive-Job -Name SERVICE_C

Stop-Job -Name "SERVICE_A", "SERVICE_B", "SERVICE_C"
Remove-Job -Name "SERVICE_A", "SERVICE_B", "SERVICE_C"

Load Balanced

i=1
for service in A B C; do
    for j in $(seq $i $((i+2))); do
        SERVICE_NAME=$service \
        SERVICE_PORT=$((9080+j)) \
        node index.js >SERVICE_${service}_SERVER_${j}.log &
    done
    i=$((i+3))
done

Queries

A -> B -> C

curl.exe http://localhost:8080/?call=http%3A%2F%2Flocalhost%3A8082%2F%3Fcall%3Dhttp%253A%252F%252Flocalhost%253A8083%252F

A -> B -> A

curl.exe http://localhost:8080/?call=http%3A%2F%2Flocalhost%3A8082%2F%3Fcall%3Dhttp%253A%252F%252Flocalhost%253A8080%252F

B -> A -> B

curl.exe http://localhost:8082/?call=http%3A%2F%2Flocalhost%3A8080%2F%3Fcall%3Dhttp%253A%252F%252Flocalhost%253A8082%252F

To-Do

• Add error handling.