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Выполняем в docker контейнере  composer команды Переходим в каталог, где лежит docker-compose.yml. Примеры 1. Контейнер с именем web: docker-compose exec web composer validate Do not run Composer as root/super user! See https://getcomposer.org/root for details ./composer.json is valid The lock file is not up to date with the latest changes in composer.json, it is recommended that you run `composer update`. 2. Обновить composer docker-compose exec web composer update Результат:  Loading composer repositories with package information 3. Попингуем из докера. Ping from docker docker-compose exec web ping ya.ru  PING ya.ru (87.250.250.242): 56 data bytes 64 bytes from 87.250.250.242: icmp_seq=0 ttl=51 time=60.216 ms 64 bytes from 87.250.250.242: icmp_seq=1 ttl=51 time=38.626 ms 64 bytes from 87.250.250.242: icmp_seq=2 ttl=51 time=47.625 ms 4. docker-compose exec web composer config repositories.drupal composer https://packages.drupal.org/8 ... 10. Т...