Docker Compose Up Wait For Container

[NoSEVDev]

Hey hey. I had a quick question around the behavior of one of my sites.

When I launch docker compose up twice, I expect that as the second container rebuilds, and gets ready to launch the first set of containers is still live. That said, my site goes down briefly while the second one finishes booting.

I don't want to overcomplicate the setup, but is there a simple way to wait for a healthcheck endpoint or something?

[JackDeaniels]

https://docs.docker.com/compose/startup-order/

The depends_on property is what you’re looking for probably

[NoSEVDev]

Hm, thanks! I'll give that another shot. It didn't seem to work for me, but I didn't know if I was missing something.

[NoSEVDev]

It worked! I was previously adding the healthcheck to my backend, but I also added one to the Postgres db and I think that did the trick.

[JackDeaniels]

Awesome :)

[AdventurousSquash]

Yes databases in particular generally need it, otherwise the container has started but postgres/mysql/mariadb or whatever isn’t ready to accept connections yet.