I am trying to make sure that my app container does not run migrations / start until the db container is started and READY TO accept connections.
So I decided to use the healthcheck and depends on option in docker compose file v2.
In the app, I have the following
app:
...
depends_on:
db:
condition: service_healthy
The db on the other hand has the following healthcheck
db:
...
healthcheck:
test: TEST_GOES_HERE
timeout: 20s
retries: 10
I have tried a couple of approaches like :
test: ["CMD", "test -f var/lib/mysql/db"]
test: ["CMD", "echo 'SELECT version();'| mysql"]
test: ["CMD", "mysqladmin" ,"ping", "-h", "localhost"]
Does anyone have a solution to this?
version: "2.1"
services:
api:
build: .
container_name: api
ports:
- "8080:8080"
depends_on:
db:
condition: service_healthy
db:
container_name: db
image: mysql
ports:
- "3306"
environment:
MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
MYSQL_USER: "user"
MYSQL_PASSWORD: "password"
MYSQL_DATABASE: "database"
healthcheck:
test: ["CMD", "mysqladmin" ,"ping", "-h", "localhost"]
timeout: 20s
retries: 10
The api container will not start until the db container is healthy (basically until mysqladmin is up and accepting connections.)