UDF on kapacitord startup error - permission denied

I'm running a docker container where kapacitord was launching fine until I created a udf. The file referenced for udf is located in same folder as the kapacitor.conf and owned by same user.

Here is error:
2017/12/06 15:20:02 Using configuration at: /etc/kapacitor/kapacitor.conf
run: open server: open service *udf.Service: failed to load process info for "mycustom": fork/exec /etc/kapacitor/mycustomUDF.py: permission denied

Kapacitor version: Kapacitor 1.3.3 (git: HEAD ce586f35e89e75a1779e2b493caba15d66295a15)

Docker running centos container with s6.

CentOs version: centos-release-7-4.1708.el7.centos.x86_64
Docker version: Docker version 17.09.0-ce, build afdb6d4

Start with the UDF service startup path and the referenced /etc/kapacitor/kapacitor.conf and /etc/kapacitor/mycustomUDF.py in the reported CentOS Docker setup. Reproduce the kapacitord launch and investigate why the UDF process cannot be executed; done means the custom UDF starts without the permission-denied error.

Written by the indexing model from the issue text.