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user630702
Asked: 2020-12-06 21:17:45 +0800 CST

Tomcat - pass Environment variable to Data Properties

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I'm trying to run tomcat in a container and want to pass DB_HOST as a environment variable.

I tried starting the container as docker run -e DB_HOST='dbhost001' -p 8080:8080 image_id. But that doesn't seem to work

Data.properties:

db.machine=${DB_HOST}
db.dbname=users
db.username=test
db.password=test
tomcat docker

1 Answers

  1. Figured it out.

    Add propertyConfigure for servlet xml file like below:

    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="searchSystemEnvironment" value="true" />
<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
</bean>

    Modify db.properties file like below:

    db.machine=${DB_HOST}
db.dbname=users
db.username=test
db.password=test

    Pass the variable to tomcat as CATALINA_OPTS="-Dkey=value" when starting tomcat.

    In my case it was docker container. So starting it as following worked.

    docker run-e CATALINA_OPTS="-DDB_HOST=dbhost001" --name tomcat -p 8080:8080 -d tomcat7:0.0.1
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