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## Wait for another service to become available
# wait-for
`./wait-for` is a script designed to synchronize services like docker containers. It is [sh](https://en.wikipedia.org/wiki/Bourne_shell) and [alpine](https://alpinelinux.org/) compatible. It was inspired by [vishnubob/wait-for-it](https://github.com/vishnubob/wait-for-it), but the core has been rewritten at [Eficode](http://eficode.com/) by [dsuni](https://github.com/dsuni) and [mrako](https://github.com/mrako).
When using this tool, you only need to pick the `wait-for` file as part of your project.
[![Build Status](https://travis-ci.org/eficode/wait-for.svg?branch=master)](https://travis-ci.org/eficode/wait-for)
## Usage
```Shell
$ ./wait-for host:port [-t timeout] [-- command args]
-q | --quiet Do not output any status messages
-t TIMEOUT | --timeout=timeout Timeout in seconds, zero for no timeout
-- COMMAND ARGS Execute command with args after the test finishes
```
./wait-for host:port [-t timeout] [-- command args]
-q | --quiet Do not output any status messages
-t TIMEOUT | --timeout=timeout Timeout in seconds, zero for no timeout
-- COMMAND ARGS Execute command with args after the test finishes
```
## Dependencies
* installed Netcat
## Examples
To check if [eficode.com](https://eficode.com) is available:
```
```Shell
$ ./wait-for www.eficode.com:80 -- echo "Eficode site is up"
Connection to www.eficode.com port 80 [tcp/http] succeeded!
@ -28,8 +30,7 @@ Eficode site is up
To wait for database container to become available:
```
```Yaml
version: '2'
services:
@ -47,14 +48,18 @@ services:
Ironically testing is done using [bats](https://github.com/sstephenson/bats), which on the other hand is depending on [bash](https://en.wikipedia.org/wiki/Bash_(Unix_shell)).
docker build -t wait-for .
docker run -t wait-for
## Note
Make sure netcat is installed in your Dockerfile before running the command.
```Shell
docker build -t wait-for .
docker run -t wait-for
```
RUN apt-get -q update && apt-get -qy install netcat
```
https://stackoverflow.com/questions/44663180/docker-why-does-wait-for-always-time-out
### License
This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
### Maintainers and Contributors
[Robert Kaussow](https://github.com/xoxys)
[eficode](https://github.com/eficode)
[Marko Klemetti](https://github.com/mrako)