Smartsupp

# Docker Wait Hosts

This script is useful when you service depends on postgres, redis or any other services. It prevents get starting errors like "Redis connecting failed".

# Usage

Docker image can have configured following variables:

  • WAIT_HOSTS - list of host:port separated by coma.
  • WAIT_HOSTS_TIMEOUT - timeout for waiting, after this timeout script exit with code 1.

NOTE: Use only docker's depends_on feature is not enough, because it only starts services before yours, and don't wait for services to be ready to use.

Example:

application-php:
    image: smartsupp/smartsupp-application-php:master
    environment:
      WAIT_HOSTS: application-mariadb:3306, application-redis:6379
      WAIT_HOSTS_TIMEOUT: 300
    depends_on:
      - application-mariadb
      - application-redis
    restart: on-failure

# Integration

To properly add support for Docker Wait Host feature you must add into entrypoint following snippet:

if [ -n "$WAIT_HOSTS" ]; then
	if [ "$(uname -m)" = 'arm64' ] || [ "$(uname -m)" = 'aarch64' ]; then
		/app/docker/wait-arm64
	else
		/app/docker/wait
	fi
fi

And add scripts wait and wait-arm64 with chmod +x.

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