$ /usr/bin/docker compose -f docker-compose-custom1.yml up --build

CMD /bin/bash -c 'python3 -m unittest /app/tests/check_mysql_host_availability_ping.py && \ 
    python3 /app/src/manage.py runserver 0.0.0.0:82'

import os
import subprocess
import time

# Get the MySQL host from the environment variable
mysql_host="179.30.0.10"
#mysql_host="172.20.0.5"
#mysql_host = os.getenv("MYSQL_HOST")

if not mysql_host:
    print("\n\n\nError! MYSQL_HOST environment variable is not set.\n\n\n")
    exit(1)

def is_mysql_host_available(host, timeout_seconds=360):
    start_time = time.time()
    
    while time.time() - start_time < timeout_seconds:
        try:
            subprocess.check_call(["ping", "-c", "1", host])
            return True
        except subprocess.CalledProcessError:
            pass  # Ping failed, continue looping
        
        # Sleep for a short duration before the next ping attempt
        time.sleep(1)

    return False

if is_mysql_host_available(mysql_host):
    subprocess.call(["/bin/bash", "-c", "echo 'MySQL host ping success.'"])
    print(f"\n\n\nSuccess! MySQL host '{mysql_host}' is available based on ping result.\n\n\n")
    exit(0)
else:
    print(f"\n\n\nError! MySQL host '{mysql_host}' is not available based on ping result.\n\n\n")
    exit(1)

core-web-1      | PING 179.30.0.10 (179.30.0.10) 56(84) bytes of data.
core-web-1      | 64 bytes from 179.30.0.10: icmp_seq=1 ttl=64 time=0.128 ms
core-web-1      | 
core-web-1      | --- 179.30.0.10 ping statistics ---
core-web-1      | 1 packets transmitted, 1 received, 0% packet loss, time 0ms
core-web-1      | rtt min/avg/max/mdev = 0.128/0.128/0.128/0.000 ms
core-web-1      | MySQL host ping success.
core-web-1      | 
core-web-1      | Success! MySQL host '179.30.0.10' is available based on ping result.
core-web-1      | 
core-web-1      | 

    environment:
      MYSQL_ROOT_HOST: "%"