Add documentation about adding instances automatically from a tag in a load balancer backend

[remyleone]

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Description

How I imagine scw could expose this functionality

References

[willoucom]

Here is a small script to replace backend ip by any instance by tag

#!/bin/bash

set -e

LB_NAME=$1
TAG=$2

cmd_f_help () {
  cat << _HELP_
Add Instance private IP to LB of your choice

  Usage :
    First parameter: Name of the load balancer
    Second parameter: Tag of your VM
_HELP_
}

if [ $# -lt 2 ]
then
    cmd_f_help
    exit 1
fi

LB_ID=$(scw lb lb list name="${LB_NAME}" -o template="{{ .ID }}")
LB_BACKEND=$(scw lb backend list lb-id="${LB_ID}" -o template="{{ .ID }}")
INSTANCE_IP=$(scw instance server list tags.0="${TAG}"  -o template="{{ .PrivateIP }}")

i=0
IPS=""
for variable in $INSTANCE_IP
do
    IPS="${IPS} server-ip.$i=$variable"
    ((i=i+1))
done

for BACKEND in $LB_BACKEND
do
    scw lb backend set-servers $BACKEND $IPS
done

[remyleone]

This could also be a feature of a backend spécific command