Apache basic proxy for DNS migration

proxy.DOMAIN_TLD.conf

# DOMAIN_TLD=yourdomain.example.com
# TARGET_IP=192.168.1.2
# cp proxy.DOMAIN_TLD.conf proxy.${DOMAIN_TLD}.conf
# sed -i "s/DOMAIN_TLD/${DOMAIN_TLD}/g" proxy.${DOMAIN_TLD}.conf
# sed -i "s/TARGET_IP/${DOMAIN_TLD}/g" proxy.${DOMAIN_TLD}.conf
# a2ensite proxy.${DOMAIN_TLD}.conf
# systemctl reload apache2

# Adapt DOMAIN_TLD and TARGET_IP
<VirtualHost *:80>
    ServerName DOMAIN.TLD

    <Proxy *>
        Order allow,deny
        Allow from all
    </Proxy>
    ProxyPreserveHost On
    ProxyPass / http://TARGET_IP/
    ProxyPassReverse / http://TARGET_IP/

    ErrorLog  /var/log/apache2/proxy.DOMAIN.TLD/error.log
    CustomLog /var/log/apache2/proxy.DOMAIN.TLD/access.log combined
</VirtualHost>

<VirtualHost *:443>
    ServerName DOMAIN.TLD

    SSLEngine On
    SSLCertificateFile      /etc/acme/DOMAIN.TLD/DOMAIN.TLD.cer
    SSLCertificateKeyFile   /etc/acme/DOMAIN.TLD/DOMAIN.TLD.key
    SSLCertificateChainFile /etc/acme/DOMAIN.TLD/fullchain.cer

    <Proxy *>
        Order allow,deny
        Allow from all
    </Proxy>
    ProxyPreserveHost On
    SSLProxyEngine On
    ProxyPass / https://TARGET_IP/
    ProxyPassReverse / https://TARGET_IP/

    ErrorLog  /var/log/apache2/proxy.DOMAIN.TLD/error.log
    CustomLog /var/log/apache2/proxy.DOMAIN.TLD/access.log combined
</VirtualHost>