apache2: Could not reliably determine the server's fully qualified domain name

[aarkkappler]

Hi everyone,

grav_1 | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using local-ip (10,192,127..) Set the 'ServerName' directive globally to suppress this message
grav_1 | AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using ocal-ip (10,192,127..) Set the 'ServerName' directive globally to suppress this message
grav_1 | [Wed Sep 29 19:27:17.895031 2021] [mpm_prefork:notice] [pid 9] AH00163: Apache/2.4.48 (Debian) configured -- resuming normal operations
grav_1 | [Wed Sep 29 19:27:17.896093 2021] [core:notice] [pid 9] AH00094: Command line: 'apache2 -D FOREGROUND'

here my docker-compose.yaml :

volumes:
grav-data:
driver: local
driver_opts:
type: none
device: ./grav
o: bind

services:
grav:
networks:
- frontend
- backend
restart: always
environment:
# Change this to the domain your Wordpress site should be served on.
VIRTUAL_HOST: my.web.site
# If you want to use LetsEncrypt on this domain, uncomment these and update them.
LETSENCRYPT_HOST: web.site
LETSENCRYPT_EMAIL: site@email.mail
build: ./
hostname: web
volumes:
- ./grav-data:/var/www/html

networks:
Frontend:
external: true
backend:
driver: bridge