ExaBGP monitor squid and announce

check-squid.sh

#!/usr/bin/env bash

STATE="start"

while true; do
  ls /etc/exabgp/squid-up  >/dev/null 2>&1
  RES=$?
  if [[ "${RES}" -eq "0" ]]; then
    if [[ "${STATE}" != "up" ]]; then
      echo "announce watchdog squid"
      STATE="up"
    fi
  else
    if [[ "${STATE}" != "down" ]]; then
      echo "withdraw watchdog squid"
      STATE="down"
    fi
  fi
  sleep 2
done

exabgp.conf

process watch-application {
        run bash /etc/exabgp/check-squid.sh;
        encoder text;
}

neighbor 10.0.55.254 {
        description "will announce a route to a service";

        router-id 10.0.55.1;

        local-address 10.0.55.1;

        local-as 65511;
        peer-as 65511;
        md5-password test_password;
        hold-time 180;

        family {
                ipv4 unicast;
        }
    
        api services {
                processes [ watch-application ];
        }
    
        static {
                route 10.1.55.1/32 {
                        next-hop self;
                        watchdog squid;
                        local-preference 100;
                        med 100;
                }
                route 10.1.55.2/32 {
                        next-hop self;
                        watchdog squid;
                        local-preference 400;
                        med 400;
                }
        }
}