devops - Should I use separate Docker containers for my web app? -

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do need use separate docker container complex web application or can put required services in 1 container? explain me why should divide app many containers (for example php-fpm container, mysql container, mongo container) when have ability install , launch stuff in 1 container?

something think when working docker how works inside. docker replaces pid 1 command specify in cmd (and entrypoint, more complex) directive in dockerfile. pid 1 init system lives (sysvinit, runit, systemd, whatever). container lives , dies whatever process started there. when process dies, container dies. stdout , stderr for process in container given on host machine when type docker logs mycontainer. incidentally, why need jump through hoops start services , run cronjobs (things done init system). important in understanding motivation doing things way.

now, can whatever want. there many opinions "right" way this, can throw away , want. figure out how run of services in 1 container. know how docker replaces pid 1 whatever command specify in cmd (and entrypoint) in dockerfiles, might think prudent try , keep apps running each in own containers, , let them work each other via container linking. (update -- 27 april 2017: container linking has been deprecated in favor of regular ole container networking, more robust, idea being join separate application containers same network can talk 1 another).

if want little deciding, can tell own experience ends being cleaner , easier maintain when separate apps individual containers , link them together. building wordpress installation hhvm, , installing nginx , hhvm/php-fpm wordpress installation in 1 container, , mariadb stuff in container. in future, let me drop in replacement wordpress installation directly in front of mariadb data no hassle. worth containerize per app. luck!


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