refactor(routing): retire HOST_NAME — derive primary host from per-port subdomains

The static per-app CFG_<APP>_HOST_NAME is gone. host_setup (the app's
canonical FQDN, feeding the legacy single DOMAINSUBNAME_DATA used by app env
vars, the app URL and trusted-domains) is now derived from the app's primary
Traefik port's subdomain: first recommended port, else first Traefik port;
@/root -> apex, set -> sub.domain, empty -> app-name. Removes HOST_NAME from
all app configs, the config-form field mapping (Hostname), the dead
headscale stub, and wireguard.sh (now uses host_setup). Completes the move to
dynamic per-port subdomain routing.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>

containers/adguard/adguard.config

@@ -43,12 +43,10 @@ CFG_ADGUARD_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_ADGUARD_DOMAIN=1
 CFG_ADGUARD_WHITELIST=false
-CFG_ADGUARD_HOST_NAME=adguard
 CFG_ADGUARD_NETWORK=default
 #
 # =============================================================================

containers/authelia/authelia.config

@@ -49,12 +49,10 @@ CFG_AUTHELIA_REQUIRES_SERVICE=traefik
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_AUTHELIA_DOMAIN=1
 CFG_AUTHELIA_WHITELIST=false
-CFG_AUTHELIA_HOST_NAME=authelia
 CFG_AUTHELIA_NETWORK=default
 #
 # =============================================================================

containers/bookstack/bookstack.config

@@ -47,12 +47,10 @@ CFG_BOOKSTACK_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_BOOKSTACK_DOMAIN=1
 CFG_BOOKSTACK_WHITELIST=false
-CFG_BOOKSTACK_HOST_NAME=bookstack
 CFG_BOOKSTACK_NETWORK=default
 #
 # =============================================================================

containers/dashy/dashy.config

@@ -37,12 +37,10 @@ CFG_DASHY_ACTIONS="configure|install|restart|shutdown|uninstall|tools"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_DASHY_DOMAIN=1
 CFG_DASHY_WHITELIST=false
-CFG_DASHY_HOST_NAME=dashy
 CFG_DASHY_NETWORK=default
 #
 # =============================================================================

containers/focalboard/focalboard.config

@@ -37,12 +37,10 @@ CFG_FOCALBOARD_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_FOCALBOARD_DOMAIN=1
 CFG_FOCALBOARD_WHITELIST=false
-CFG_FOCALBOARD_HOST_NAME=board
 CFG_FOCALBOARD_NETWORK=default
 
 # =============================================================================

containers/gitea/gitea.config

@@ -41,12 +41,10 @@ CFG_GITEA_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_GITEA_DOMAIN=1
 CFG_GITEA_WHITELIST=false
-CFG_GITEA_HOST_NAME=gitea
 CFG_GITEA_NETWORK=default
 #
 # =============================================================================

containers/gluetun/gluetun.config

@@ -70,12 +70,10 @@ CFG_GLUETUN_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_GLUETUN_DOMAIN=1
 CFG_GLUETUN_WHITELIST=false
-CFG_GLUETUN_HOST_NAME=gluetun
 CFG_GLUETUN_NETWORK=default
 #
 # =============================================================================

containers/grafana/grafana.config

@@ -42,12 +42,10 @@ CFG_GRAFANA_REQUIRES_SERVICE=prometheus
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_GRAFANA_DOMAIN=1
 CFG_GRAFANA_WHITELIST=false
-CFG_GRAFANA_HOST_NAME=grafana
 CFG_GRAFANA_NETWORK=default
 #
 # =============================================================================

containers/headscale/headscale.config

@@ -37,12 +37,10 @@ CFG_HEADSCALE_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_HEADSCALE_DOMAIN=1
 CFG_HEADSCALE_WHITELIST=false
-CFG_HEADSCALE_HOST_NAME=headscale
 CFG_HEADSCALE_NETWORK=default
 #
 # =============================================================================

containers/invidious/invidious.config

@@ -40,12 +40,10 @@ CFG_INVIDIOUS_ACTIONS="configure|install|restart|shutdown|uninstall|tools"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_INVIDIOUS_DOMAIN=1
 CFG_INVIDIOUS_WHITELIST=false
-CFG_INVIDIOUS_HOST_NAME=invidious
 CFG_INVIDIOUS_NETWORK=default
 #
 # =============================================================================

containers/ipinfo/ipinfo.config

@@ -37,12 +37,10 @@ CFG_IPINFO_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_IPINFO_DOMAIN=1
 CFG_IPINFO_WHITELIST=false
-CFG_IPINFO_HOST_NAME=ipinfo
 CFG_IPINFO_NETWORK=default
 #
 # =============================================================================

containers/jellyfin/jellyfin.config

@@ -37,12 +37,10 @@ CFG_JELLYFIN_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_JELLYFIN_DOMAIN=1
 CFG_JELLYFIN_WHITELIST=false
-CFG_JELLYFIN_HOST_NAME=jellyfin
 CFG_JELLYFIN_NETWORK=default
 #
 # =============================================================================

containers/jitsimeet/jitsimeet.config

@@ -37,12 +37,10 @@ CFG_JITSIMEET_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 #
 CFG_JITSIMEET_DOMAIN=1
 CFG_JITSIMEET_WHITELIST=false
-CFG_JITSIMEET_HOST_NAME=meet
 CFG_JITSIMEET_NETWORK=default
 #
 # =============================================================================

containers/libreportal/libreportal.config

@@ -39,12 +39,10 @@ CFG_LIBREPORTAL_ACTIONS="configure|install|restart|shutdown|tools"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_LIBREPORTAL_DOMAIN=1
 CFG_LIBREPORTAL_WHITELIST=false
-CFG_LIBREPORTAL_HOST_NAME=libreportal
 #
 # =============================================================================
 # PORT CONFIGURATION

containers/linkding/linkding.config

@@ -37,12 +37,10 @@ CFG_LINKDING_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_LINKDING_DOMAIN=1
 CFG_LINKDING_WHITELIST=false
-CFG_LINKDING_HOST_NAME=bookmark
 CFG_LINKDING_NETWORK=default
 #
 # =============================================================================

containers/mastodon/mastodon.config

@@ -37,12 +37,10 @@ CFG_MASTODON_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_MASTODON_DOMAIN=1
 CFG_MASTODON_WHITELIST=false
-CFG_MASTODON_HOST_NAME=social
 CFG_MASTODON_NETWORK=default
 #
 # =============================================================================

containers/moneyapp/moneyapp.config

@@ -40,12 +40,10 @@ CFG_MONEYAPP_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips (see general config), if false allow all
 # NETWORK = default | gluetun (route outbound traffic through the VPN gateway)
 #
 CFG_MONEYAPP_DOMAIN=1
-CFG_MONEYAPP_HOST_NAME=moneyapp
 CFG_MONEYAPP_WHITELIST=false
 CFG_MONEYAPP_NETWORK=default
 #

containers/nextcloud/nextcloud.config

@@ -49,12 +49,10 @@ CFG_NEXTCLOUD_ACTIONS="configure|install|restart|shutdown|uninstall|tools"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_NEXTCLOUD_DOMAIN=1
 CFG_NEXTCLOUD_WHITELIST=false
-CFG_NEXTCLOUD_HOST_NAME=nextcloud
 CFG_NEXTCLOUD_NETWORK=default
 #
 # =============================================================================

containers/ollama/ollama.config

@@ -44,7 +44,6 @@ CFG_OLLAMA_ACTIONS="configure|install|restart|shutdown|uninstall"
 #
 CFG_OLLAMA_DOMAIN=1
 CFG_OLLAMA_WHITELIST=false
-CFG_OLLAMA_HOST_NAME=ollama
 CFG_OLLAMA_NETWORK=default
 #
 # =============================================================================

containers/onlyoffice/onlyoffice.config

@@ -42,7 +42,6 @@ CFG_ONLYOFFICE_ACTIONS="configure|install|restart|shutdown|uninstall"
 #
 CFG_ONLYOFFICE_DOMAIN=1
 CFG_ONLYOFFICE_WHITELIST=false
-CFG_ONLYOFFICE_HOST_NAME=onlyoffice
 CFG_ONLYOFFICE_NETWORK=default
 #
 # =============================================================================

containers/owncloud/owncloud.config

@@ -52,7 +52,6 @@ CFG_OWNCLOUD_ACTIONS="configure|install|restart|shutdown|uninstall"
 #
 CFG_OWNCLOUD_DOMAIN=1
 CFG_OWNCLOUD_WHITELIST=false
-CFG_OWNCLOUD_HOST_NAME=cloud
 CFG_OWNCLOUD_NETWORK=default
 #
 # =============================================================================

containers/pihole/pihole.config

@@ -48,12 +48,10 @@ CFG_PIHOLE_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_PIHOLE_DOMAIN=1
 CFG_PIHOLE_WHITELIST=false
-CFG_PIHOLE_HOST_NAME=pihole
 CFG_PIHOLE_NETWORK=default
 #
 # =============================================================================

containers/prometheus/prometheus.config

@@ -37,12 +37,10 @@ CFG_PROMETHEUS_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_PROMETHEUS_DOMAIN=1
 CFG_PROMETHEUS_WHITELIST=false
-CFG_PROMETHEUS_HOST_NAME=prometheus
 CFG_PROMETHEUS_NETWORK=default
 #
 # =============================================================================

containers/searxng/searxng.config

@@ -44,12 +44,10 @@ CFG_SEARXNG_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_SEARXNG_DOMAIN=1
 CFG_SEARXNG_WHITELIST=false
-CFG_SEARXNG_HOST_NAME=search
 CFG_SEARXNG_NETWORK=default
 #
 # =============================================================================

containers/speedtest/speedtest.config

@@ -45,12 +45,10 @@ CFG_SPEEDTEST_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_SPEEDTEST_DOMAIN=1
 CFG_SPEEDTEST_WHITELIST=false
-CFG_SPEEDTEST_HOST_NAME=speedtest
 CFG_SPEEDTEST_NETWORK=default
 #
 # =============================================================================

containers/traefik/traefik.config

@@ -58,12 +58,10 @@ CFG_TRAEFIK_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_TRAEFIK_DOMAIN=1
 CFG_TRAEFIK_WHITELIST=false
-CFG_TRAEFIK_HOST_NAME=traefik
 CFG_TRAEFIK_NETWORK=default
 #
 # =============================================================================

containers/trilium/trilium.config

@@ -37,12 +37,10 @@ CFG_TRILIUM_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_TRILIUM_DOMAIN=1
 CFG_TRILIUM_WHITELIST=false
-CFG_TRILIUM_HOST_NAME=notes
 CFG_TRILIUM_NETWORK=default
 #
 # =============================================================================

containers/unbound/unbound.config

@@ -39,12 +39,10 @@ CFG_UNBOUND_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_UNBOUND_DOMAIN=1
 CFG_UNBOUND_WHITELIST=false
-CFG_UNBOUND_HOST_NAME=unbound
 CFG_UNBOUND_NETWORK=default
 #
 # =============================================================================

containers/vaultwarden/vaultwarden.config

@@ -48,12 +48,10 @@ CFG_VAULTWARDEN_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_VAULTWARDEN_DOMAIN=1
 CFG_VAULTWARDEN_WHITELIST=false
-CFG_VAULTWARDEN_HOST_NAME=vault
 CFG_VAULTWARDEN_NETWORK=default
 #
 # =============================================================================

containers/wireguard/wireguard.config

@@ -51,12 +51,10 @@ CFG_WIREGUARD_ACTIONS="configure|install|restart|shutdown|uninstall"
 # NETWORK CONFIGURATION
 # =============================================================================
 # DOMAIN = number of domain from the general config, useful when using multiple domains
-# HOST_NAME = subdomain name e.g test is the name for test.website.com
 # WHITELIST = if true only allow whitelisted ips on traefik, if false allow all
 #
 CFG_WIREGUARD_DOMAIN=1
 CFG_WIREGUARD_WHITELIST=false
-CFG_WIREGUARD_HOST_NAME=wireguard
 CFG_WIREGUARD_NETWORK=default
 #
 # =============================================================================

containers/wireguard/wireguard.sh

@@ -96,7 +96,7 @@ installWireguard()
             _wg_traefik_installed=1
         fi
         if [[ -n "$domain_full" && $_wg_traefik_installed -eq 1 ]]; then
-            wg_host_value="${CFG_WIREGUARD_HOST_NAME:-wireguard}.${domain_full}"
+            wg_host_value="$host_setup"
             isNotice "Domain + Traefik present — peer configs will use $wg_host_value"
         else
             wg_host_value="${public_ip_v4:-127.0.0.1}"

scripts/network/variables/headscale_variables.sh

@@ -12,14 +12,13 @@ setupHeadscaleVariables()
     fi
 
     # Build variable names based on app_name
-    headscale_host_name_var="CFG_${app_name^^}_HOST_NAME"
     headscale_domain_var="CFG_${app_name^^}_DOMAIN"
     headscale_setup_var="CFG_${app_name^^}_HEADSCALE"
 
     # Access the variables using variable indirection
-    headscale_host_name="${!headscale_host_name_var}"
     headscale_domain="${!headscale_domain_var}"
     headscale_setup="${!headscale_setup_var}"
+    # (HOST_NAME read dropped in the per-port subdomain refactor — it was unused.)
 
     # UNFINISHED
 }

scripts/network/variables/variables_init_app.sh

@@ -13,7 +13,6 @@ initializeAppVariables()
     fi
 
     # Build variable names based on app_name
-    host_name_var="CFG_${app_name^^}_HOST_NAME"
     compose_setup_var="CFG_${app_name^^}_COMPOSE_FILE"
     domain_var="CFG_${app_name^^}_DOMAIN"
     whitelist_var="CFG_${app_name^^}_WHITELIST"
@@ -24,7 +23,6 @@ initializeAppVariables()
     app_title_var="CFG_${app_name^^}_TITLE"
 
     # Access the variables using variable indirection
-    host_name="${!host_name_var}"
     compose_setup="${!compose_setup_var}"
     domain="${!domain_var}"
     whitelist="${!whitelist_var}"
@@ -35,18 +33,10 @@ initializeAppVariables()
     app_title="${!app_title_var}"
     domain_var_name="CFG_DOMAIN_${domain}"
     domain_full="${!domain_var_name}"
-    # FQDN for this app's Traefik Host() rule (also feeds the app URL and
-    # trusted-domains):
-    #   HOST_NAME="@" or "root"  -> <domain>             (apex / root of domain)
-    #   HOST_NAME set            -> <HOST_NAME>.<domain> (custom subdomain)
-    #   HOST_NAME empty          -> <app_name>.<domain>  (fallback default)
-    if [[ "$host_name" == "@" || "$host_name" == "root" ]]; then
-        host_setup="${domain_full}"
-    else
-        host_setup="${host_name:-$app_name}.${domain_full}"
-    fi
     ssl_key=${domain_full}.key
     ssl_crt=${domain_full}.crt
+    # host_setup (the app's primary/canonical FQDN) is derived from the primary
+    # Traefik port's subdomain, computed after the port arrays are parsed below.
 
     # Port configuration variables
     port_config_vars=()
@@ -164,4 +154,24 @@ initializeAppVariables()
     for _t in "${port_traefik_managed[@]}"; do
         [[ "$_t" == "true" ]] && { public="true"; break; }
     done
+
+    # Primary/canonical host for this app: its first recommended Traefik port,
+    # else its first Traefik port. Feeds the legacy single DOMAINSUBNAME_DATA
+    # (app env vars), the app URL, and trusted-domains. Mirrors the per-port
+    # host rule (@/root -> apex, set -> sub.domain, empty -> app-name).
+    host_setup="${app_name}.${domain_full}"
+    local _i _primary=-1
+    for ((_i = 0; _i < ${#port_service_names[@]}; _i++)); do
+        [[ "${port_traefik_managed[$_i]}" == "true" ]] || continue
+        if [[ "${port_recommendeds[$_i]}" == "true" ]]; then _primary=$_i; break; fi
+        [[ $_primary -lt 0 ]] && _primary=$_i
+    done
+    if [[ $_primary -ge 0 ]]; then
+        local _sub="${port_subdomains[$_primary]}"
+        if [[ "$_sub" == "@" || "$_sub" == "root" ]]; then
+            host_setup="${domain_full}"
+        elif [[ -n "$_sub" ]]; then
+            host_setup="${_sub}.${domain_full}"
+        fi
+    fi
 }

scripts/webui/data/generators/categories/webui_create_app_field_mappings.sh

@@ -79,13 +79,6 @@ webuiCreateAppFieldMappings() {
       "nonEditable": true,
       "displayInfo": true
     },
-    "HOST_NAME": {
-      "category": "network",
-      "label": "Hostname",
-      "type": "text",
-      "tooltip": "Subdomain this app is served on — e.g. myapp becomes myapp.yourdomain.com. Use @ to serve it on the root of your domain (yourdomain.com itself).",
-      "placeholder": "myapp  ·  @ = root domain"
-    },
     "DOMAIN": {
       "category": "network",
       "label": "Domain",