Lib.rs

Wait for another service to become available

wait_for is a rust based cli designed to synchronize services such as docker containers. It is highly inspired by eficode/wait-for, but rewritten to use with rust.

Installation

To install the cli first you need to clone repository locally:

git clone https://github.com/aktitarov/wait_for.git && cd wait_for

Then install it to your path using cargo:

cargo install --path .

Usage

Waits for another service to become available

USAGE:
    wait_for [OPTIONS] --host <host> --port <port> [command]...

FLAGS:
        --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
    -h, --host <host>          Sets host of service to be watched
    -p, --port <port>          Sets port of service to be watched
    -t, --timeout <timeout>    Sets timeout in secons, zero for no timeout

ARGS:
    <command>...    Command to execute after service is available

Examples

To check if google.com is available:

wait_for -h www.google.com -p 80 -- echo "Google is up"

To wait for database container to become available:

version: '3'

service:
  database:
    image: postgres:latest
  app:
    build: .
    command: sh -c 'wait_for -h database -p 5432 -- ./target/release/app'
    depends_on:
      - database

Note

Make sure netcat is installed in your Dockerfile before running the command.

RUN apt-get -q update && apt-get -qy install netcat

https://stackoverflow.com/questions/44663180/docker-why-does-wait-for-always-time-out