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52 lines
1.6 KiB
Markdown
52 lines
1.6 KiB
Markdown
## Wait for another service to become available
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`./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).
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When using this tool, you only need to pick the `wait-for` file as part of your project.
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[](https://travis-ci.org/eficode/wait-for)
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## Usage
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```
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./wait-for host:port [-t timeout] [-- command args]
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-q | --quiet Do not output any status messages
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-t TIMEOUT | --timeout=timeout Timeout in seconds, zero for no timeout
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-- COMMAND ARGS Execute command with args after the test finishes
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```
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## Examples
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To check if [eficode.com](https://eficode.com) is available:
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```
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$ ./wait-for www.eficode.com:80 -- echo "Eficode site is up"
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Connection to www.eficode.com port 80 [tcp/http] succeeded!
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Eficode site is up
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```
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To wait for database container to become available:
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```
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version: '2'
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services:
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db:
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image: postgres:9.4
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backend:
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build: backend
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command: sh -c './wait-for db:5432 -- npm start'
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depends_on:
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- db
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```
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## Testing
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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)).
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docker build -t wait-for .
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docker run -t wait-for
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