[SRE / Docker] Start control with Dockerize

I will write about Dockerize which is convenient when you want to wait for DB connection when using docker-compose.

Start control options

As far as I can see below, it seems that wait-for-it and dockerize are valid. Controlling the startup order in Compose — Docker-docs-ja 17.06 Document

Wait until MySQL starts with Docker Compose-Qiita How to wait until MySQL starts with docker-compose up (2 types introduced) --Qiita

Dockerize

What is Dockerize

GitHub - jwilder/dockerize: Utility to simplify running applications in docker containers

use

Modify dockerfile and docker-compose.yaml.

ENV DOCKERIZE_VERSION v0.6.0
RUN apk add --no-cache openssl \
    && wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
    && tar -C /usr/local/bin -xzvf dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
    && rm dockerize-alpine-linux-amd64-$DOCKERIZE_VERSION.tar.gz

Define the dockerize command with docker-compose. The command dockerize -wait tcp: // db: 5432 will allow you to wait for the dependent application to start.

entrypoint:
  - dockerize
  - -timeout
  - 60s
  - -wait
  - tcp://mysql:3306
command: ./main #Run with go

Wait for other containers to start using Dockerize-Qiita

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