Docker setup with nginx, getting 502 server error

Questions
1

I am using wodby containers for nginx, mariadb and php (docker-compose file included at the end).

Installed Silverstrip 4.5.1 using composer, built database with vendor/bin/sake dev/build.

I used this for the nginx config Nginx webserver configuration

The only things I changed were
root /var/www/html/mysite/public;
server_name localhost;

Looking at the nginx log after curl http://localhost:8080:
docker logs --tail 50 --follow --timestamps silverstripecontainer_nginx_1

I see
2020-03-31T09:42:48.584991369Z 2020/03/31 09:42:48 [error] 33#33: *27 connect() failed (111: Connection refused) while connecting to upstream, client: 172.19.0.1, server: localhost, request: “GET / HTTP/1.1”, upstream: “fastcgi://127.0.0.1:9000”, host: “localhost:8080”
2020-03-31T09:42:48.584992184Z 172.19.0.1 - - [31/Mar/2020:09:42:48 +0000] “GET / HTTP/1.1” 502 3702 “-” “curl/7.69.1”

At first, the base URL was some autogenerated ID, which broke fetching the CSS etc., so I added SS_BASE_URL=“http://localhost:8080” to my .env file. Now the site theme loads, but for the content I only see

Server error

Sorry, there was a problem with handling your request.

Any ideas on what might be wrong?

My docker-compose file:

version: '3.0'

services:
  nginx:
    image: wodby/nginx:latest
    environment:
      NGINX_CONF_INCLUDE: sites-enabled/*
    volumes:
      - ./silverstripe:/var/www/html
      - ./mysite.conf:/etc/nginx/sites-enabled/mysite.conf
    ports:
      - "8080:80"
    links:
      - mariadb
      - php-fpm
    restart: "no"

  mariadb:
    image: wodby/mariadb:latest
    environment:
      MYSQL_DATABASE: silverstripe
      MYSQL_USER: silverstripe
      MYSQL_PASSWORD: password
      MYSQL_ROOT_PASSWORD: password
    volumes:
      - ./mariadbdata:/var/lib/mysql
      - ./override.cnf:/etc/mysql/conf.d/override.cnf
    ports:
      - "3306:3306"
    restart: "no"

  php-fpm:
    image: wodby/php:latest
    environment:
      PHP_MAX_EXECUTION_TIME: 1000
      PHP_MEMORY_LIMIT: 4096M
      PHP_UPLOAD_MAX_FILESIZE: 4096M
      PHP_POST_MAX_SIZE: 4096M
      PHP_MAX_INPUT_TIME: 1000
      PHP_MAX_INPUT_VARS: 10000
    volumes:
      - ./silverstripe:/var/www/html
    restart: "no"
    dns:
      - 8.8.8.8
      - 4.4.4.4
      - 0.0.0.0
2

I gave up and switched to the silverstripe-web container. This works:

version: '3.0'

services:
  silverstripe:
    image: brettt89/silverstripe-web:latest
    volumes:
      - ./silverstripe:/var/www/html
      - ./libreoffice.conf:/etc/nginx/sites-enabled/libreoffice.conf
    ports:
      - "8080:80"
    links:
      - mariadb
    restart: "no"

  mariadb:
    image: wodby/mariadb:latest
    environment:
      MYSQL_DATABASE: silverstripe
      MYSQL_USER: silverstripe
      MYSQL_PASSWORD: password
      MYSQL_ROOT_PASSWORD: password
    volumes:
      - ./mariadbdata:/var/lib/mysql
      - ./override.cnf:/etc/mysql/conf.d/override.cnf
    ports:
      - "3306:3306"
    restart: "no"