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Aanand Prasad 2014-01-27 15:03:21 +00:00
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---
layout: default
title: Fig environment variables reference
---
Environment variables reference
===============================
Fig uses [Docker links] to expose services' containers to one another. Each linked container injects a set of environment variables, each of which begins with the uppercase name of the container.
<b><i>name</i>\_PORT</b><br>
Full URL, e.g. `MYAPP_DB_1_PORT=tcp://172.17.0.5:5432`
<b><i>name</i>\_PORT\_<i>num</i>\_<i>protocol</i></b><br>
Full URL, e.g. `MYAPP_DB_1_PORT_5432_TCP=tcp://172.17.0.5:5432`
<b><i>name</i>\_PORT\_<i>num</i>\_<i>protocol</i>\_ADDR</b><br>
Container's IP address, e.g. `MYAPP_DB_1_PORT_5432_TCP_ADDR=172.17.0.5`
<b><i>name</i>\_PORT\_<i>num</i>\_<i>protocol</i>\_PORT</b><br>
Exposed port number, e.g. `MYAPP_DB_1_PORT_5432_TCP_PORT=5432`
<b><i>name</i>\_PORT\_<i>num</i>\_<i>protocol</i>\_PROTO</b><br>
Protocol (tcp or udp), e.g. `MYAPP_DB_1_PORT_5432_TCP_PROTO=tcp`
<b><i>name</i>\_NAME</b><br>
Fully qualified container name, e.g. `MYAPP_DB_1_NAME=/myapp_web_1/myapp_db_1`
[Docker links]: http://docs.docker.io/en/latest/use/port_redirection/#linking-a-container