在 Docker 中更新自定义配置文件

Question

I am new to Docker . My requirement is to create a docker file which should install Wildfly server, add war file to Wildfly , add custom property file (which contains db connection strings which will read by application)

My Docker file

FROM jboss/wildfly
Add application.properties /opt/jboss/
ADD spring_application.war /opt/jboss/wildfly/standalone/deployments/

application.properties

db_url = jdbc:mysql://**server host name**:**port**
db_username = **username**
db_password = **password**

Note: in the above file server host name, port, username, password should be dynamic

War file (spring rest application) will read parameters from application.properties

I am able successfully install Wildfly and deployed application. Now i need to pass parameters in application.properties at runtime. Please help me if anyone has solution.

Answer 1

You can do this by overwriting entrypoint script. Here is example run.sh script which creates application.properties file before booting application.

run.sh

#!/bin/bash -x
PROPERTIES=/opt/jboss/application.properties
echo "db_url = jdbc:mysql://${MYSQL_HOST}:${MYSQL_PORT" > ${PROPERTIES}
echo "db_username = ${MYSQL_USER}" >> ${PROPERTIES}
echo "db_password = ${MYSQL_PASS}" >> ${PROPERTIES}
exec /opt/jboss/wildfly/bin/standalone.sh -b 0.0.0.0 $@

Dockerfile

FROM jboss/wildfly
ADD run.sh /run.sh
CMD /run.sh
ADD spring_application.war /opt/jboss/wildfly/standalone/deployments/

Run this with:

docker run -e MYSQL_HOST=mysqlhost -e MYSQL_USER=user -e MYSQL_PASS=pass wildflyimage