Could not connect to server: Connection refused Is the server running on host "127.0.0.1" and accepting TCP/IP connections on port 5432?

Docker version : 19.03.12

Postgres version : latest

PHP : 7.4

Project in Symfony

When I start docker-compose build all is OK

But when I would like up the project, I have an error :
SQLSTATE[08006] [7] could not connect to server: Connection refused Is the server running on host "127.0.0.1" and accepting TCP/IP connections on port 5432?

docker-compose.yml:

version: '3.4'
services:
  php:
    build:
      context: ./kapitain
      dockerfile: Dockerfile-php
    volumes:
      - ./kapitain:/var/www/html
    depends_on:
      - db
  db:
    image: postgres:latest
    restart: always
    environment:
      - POSTGRES_DB=kapitain
      - POSTGRES_USER=kapitain_user
      - POSTGRES_PASSWORD=kapitain_user_password
    volumes:
      - ./kapitain/docker/postgres/init.sql:/docker-entrypoint-initdb.d/init.sql
      - db-data:/var/lib/postgresql/data:rw
    ports:
      - "5432:5432"
  api:
    build:
      context: ./kapitain
      dockerfile: Dockerfile-nginx
    ports:
      - "80:8080"
    volumes:
      - ./kapitain/public:/var/www/html/public:ro
    depends_on:
      - php
volumes:
  db-data: {}

Dockerfile-php :

ARG PHP_VERSION=7.4

FROM php:${PHP_VERSION}-fpm-alpine

RUN wget https://download.microsoft.com/download/e/4/e/e4e67866-dffd-428c-aac7-8d28ddafb39b/msodbcsql17_17.5.1.1-1_amd64.apk && 
    wget https://download.microsoft.com/download/e/4/e/e4e67866-dffd-428c-aac7-8d28ddafb39b/mssql-tools_17.5.1.1-1_amd64.apk

# persistent / runtime deps
RUN apk add --no-cache 
        acl 
        fcgi 
        file 
        gettext 
        git 
        gnupg 
        --allow-untrusted msodbcsql17_17.5.1.1-1_amd64.apk 
        --allow-untrusted mssql-tools_17.5.1.1-1_amd64.apk 
    ;

ARG APCU_VERSION=5.1.18
RUN set -eux; 
    apk add --no-cache --virtual .build-deps 
        $PHPIZE_DEPS 
        icu-dev 
        libzip-dev 
        postgresql-dev 
        zip 
        zlib-dev 
        unixodbc-dev 
    ; 
    
    docker-php-ext-configure zip; 
    docker-php-ext-install -j$(nproc) 
        intl 
        pdo_pgsql 
        pdo_mysql 
        zip 
    ; 
    pecl install 
        apcu-${APCU_VERSION} 
        xdebug 
        pdo_sqlsrv 
    ; 
    pecl clear-cache; 
    docker-php-ext-enable 
        apcu 
        opcache 
        xdebug 
        pdo_sqlsrv 
    ; 
    
    runDeps="$( 
        scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions 
            | tr ',' 'n' 
            | sort -u 
            | awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' 
    )"; 
    apk add --no-cache --virtual .api-phpexts-rundeps $runDeps; 
    
    apk del .build-deps

RUN rm msodbcsql17_17.5.1.1-1_amd64.apk && 
    rm mssql-tools_17.5.1.1-1_amd64.apk

COPY --from=composer:latest /usr/bin/composer /usr/bin/composer

RUN ln -s $PHP_INI_DIR/php.ini-production $PHP_INI_DIR/php.ini

# https://getcomposer.org/doc/03-cli.md#composer-allow-superuser
ENV COMPOSER_ALLOW_SUPERUSER=1
# install Symfony Flex globally to speed up download of Composer packages (parallelized prefetching)
RUN set -eux; 
    composer global require "symfony/flex" --prefer-dist --no-progress --no-suggest --classmap-authoritative; 
    composer clear-cache
ENV PATH="${PATH}:/root/.composer/vendor/bin"

WORKDIR /var/www/html

# build for production
ARG APP_ENV=prod

# prevent the reinstallation of vendors at every changes in the source code
COPY composer.json composer.lock symfony.lock ./
RUN set -eux; 
    composer install --no-dev --prefer-dist --no-scripts --no-progress --no-suggest; 
    composer clear-cache

# do not use .env files in production
COPY .env ./
COPY .env.test ./
COPY behat.yml.dist ./behat.yml
RUN composer dump-env ${APP_ENV}; 
    rm .env; 
    rm .env.test

# copy only specifically what we need
COPY bin bin/
COPY config config/
COPY public public/
COPY src src/
COPY features features/
COPY fixtures fixtures/
COPY templates templates/
COPY translations translations/

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

COPY docker/php/docker-entrypoint.sh /usr/local/bin/docker-entrypoint
RUN chmod +x /usr/local/bin/docker-entrypoint

RUN chown -R www-data:www-data /var/www/html
USER www-data:www-data

ENTRYPOINT ["docker-entrypoint"]
CMD ["php-fpm"]

DATABASE_URL in .env :
DATABASE_URL=pgsql://kapitain_user:[email protected]:5432/kapitain

netstat -at :
TCP 0.0.0.0:5432 PGLW0321:0 LISTENING InHost

Someone can help me please?

Best regards

Source: Symfony Questions

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