Gitlab ci, symfony + postgres Error Connection refused - postgresql

Question

I have an error when I create the schema with doctine
$ php bin/console doctrine:schema:create --env=test
In AbstractPostgreSQLDriver.php line 73:
An exception occurred in driver: SQLSTATE[08006] [7] could not connect to s
erver: Connection refused
Is the server running on host "127.0.0.1" and accepting
TCP/IP connections on port 5432?
with my gitlab-ci.yml
database:
stage: building
services:
- postgres:10
variables:
POSTGRES_DB: back
POSTGRES_USER: postgres
POSTGRES_PASSWORD: ''
POSTGRES_HOST: postgres
POSTGRES_PORT: 5432
before_script:
# Install pdo_pgsql driver
- apt-get update
- apt-get install -y libpq-dev
- docker-php-ext-install pdo_pgsql
script:
- php bin/console doctrine:schema:create --env=test
- php -d memory_limit=2048M bin/console --env=test cache:warmup --no-debug
And my gitlab-parameters.yml (who is cp on app/config/parameters.yml)
parameters:
database_host: postgres
database_port: 5432
database_name: back
database_user: postgres
database_password: ''
Other information :
when I try to create database, I have the good message from gitlab-ci
$ php bin/console doctrine:database:create --env=test
Could not create database "back" for connection named default
An exception occurred while executing 'CREATE DATABASE "back"':
SQLSTATE[42P04]: Duplicate database: 7 ERROR: database "back" already exists
Version :
php 7.2.19
smyfony 3.4
and my config_text.yml
imports:
- { resource: config_dev.yml }
framework:
test: ~
session:
storage_id: session.storage.mock_file
profiler:
collect: false
web_profiler:
toolbar: false
intercept_redirects: false
swiftmailer:
disable_delivery: true
How fix it?
EDIT :
postgres is not running :
netstat -plntu
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:6379 0.0.0.0:* LISTEN -