Can not get flyway-docker to recognize local files in volumes - flyway

Question

I am trying to use Flyway to set up a DB2 test/demo environment in a Docker container. I have an image of DB2 running in a docker container and now am trying to get flyway to create the database environment. I can connect to the DB2 docker container and create DB2 objects and load them with data, but am looking for a way for non-technical users to do this (i.e. clone a GitHub repo and issue a single docker run command).
The Flyway Docker site (https://github.com/flyway/flyway-docker) indicates that it supports the following volumes:
| Volume | Description |
|-------------------|--------------------------------------------------------|
| `/flyway/conf` | Directory containing a flyway.conf |
| `/flyway/drivers` | Directory containing the JDBC driver for your database |
| `/flyway/sql` | The SQL files that you want Flyway to use |
I created the conf, drivers, and sql directories. In the conf directory, I placed the file flyway.conf that contained my flyway Url, user name, and password:
flyway.url=jdbc:db2://localhost:50000/apidemo
flyway.user=DB2INST1
flyway.passord=mY%tEst%pAsSwOrD
In the drivers directory, I added the DB2 JDBC Type 4 drivers (e.g. db2jcc4.jar, db2jcc_license_cisuz.jar),
And in the sql directory I put in a simple table creation statement (file name: V1__make_temp_table.sql):
CREATE TABLE EDS.REFT_TEMP_DIM (
TEMP_ID INTEGER NOT NULL )
, TEMP_CD CHAR (8)
, TEMP_NM VARCHAR (255)
)
DATA CAPTURE NONE
COMPRESS NO;
Attempting to perform the docker run with the flyway/flyway image as described in the GitHub Readme.md, it is not recognizing the flyway.conf file, since it does not know the url, user, and password.
docker run --rm -v sql:/flyway/sql -v conf:/flyway/conf -v drivers:/flyway/drivers flyway/flyway migrate
Flyway Community Edition 6.5.5 by Redgate
ERROR: Unable to connect to the database. Configure the url, user and password!
I then put the url, user, and password inline and It could not find the JDBC driver.
docker run --rm -v sql:/flyway/sql -v drivers:/flyway/drivers flyway/flyway -url=jdbc:db2://localhost:50000/apidemo -user=DB2INST1 -password=mY%tEst%pAsSwOrD migrate
ERROR: Unable to instantiate JDBC driver: com.ibm.db2.jcc.DB2Driver => Check whether the jar file is present
Caused by: Unable to instantiate class com.ibm.db2.jcc.DB2Driver : com.ibm.db2.jcc.DB2Driver
Caused by: java.lang.ClassNotFoundException: com.ibm.db2.jcc.DB2Driver
Therefore, I believe it is the way that I am setting up the local file system or associating to local files with the flyway volumes that is causing the issue. Does anyone have an idea of what I am doing wrong?

Answer 1

You need to supply absolute paths to your volumes for docker to mount them.
Changing the relative paths to absolute paths fixed the volume mount issue.
docker run --rm \
-v /Users/steve/github-ibm/flyway-db-migration/sql:/flyway/sql \
-v /Users/steve/github-ibm/flyway-db-migration/conf:/flyway/conf \
-v /Users/steve/github-ibm/flyway-db-migration/drivers:/flyway/drivers \
flyway/flyway migrate