В статье на Хабре обсуждался «docker way»(TM), который гласит: один контейнер — один процесс.
one process per container
Следование этому принципу при докеризации nginx чревато двумя последствиями. Настроить взаимодействие nginx и php-fpm в разных процессах через unix сокет немного сложнее, чем может показаться. И ротация логов, которая при обычной установке идет «из коробки», не может осуществляться в принципе, т.к. требует отправки сигнала USR1 nginx, для чего нужен ещё один процесс.Each container should have only one concern
Decoupling applications into multiple containers makes it much easier to scale horizontally and reuse containers. For instance, a web application stack might consist of three separate containers, each with its own unique image, to manage the web application, database, and an in-memory cache in a decoupled manner.
You may have heard that there should be “one process per container”. While this mantra has good intentions, it is not necessarily true that there should be only one operating system process per container. In addition to the fact that containers can now be spawned with an init process, some programs might spawn additional processes of their own accord. For instance, Celery can spawn multiple worker processes, or Apache might create a process per request. While “one process per container” is frequently a good rule of thumb, it is not a hard and fast rule. Use your best judgment to keep containers as clean and modular as possible.
If containers depend on each other, you can use Docker container networks to ensure that these containers can communicate.
Decoupling applications into multiple containers makes it much easier to scale horizontally and reuse containers. For instance, a web application stack might consist of three separate containers, each with its own unique image, to manage the web application, database, and an in-memory cache in a decoupled manner.
You may have heard that there should be “one process per container”. While this mantra has good intentions, it is not necessarily true that there should be only one operating system process per container. In addition to the fact that containers can now be spawned with an init process, some programs might spawn additional processes of their own accord. For instance, Celery can spawn multiple worker processes, or Apache might create a process per request. While “one process per container” is frequently a good rule of thumb, it is not a hard and fast rule. Use your best judgment to keep containers as clean and modular as possible.
If containers depend on each other, you can use Docker container networks to ensure that these containers can communicate.
