Error : /usr/bin/postgresql-setup initdb no such file or directory

Symptom:

When we build postgresql 9.5 docker image, we
 /usr/bin/postgresql-setup initdb  no such file or directory

Solution:

It is due to initdb was not in default PATH . By default, yum installs initdb at /usr/pgsql-9.5/bin
To fix that we add below line into Dockerfile
RUN ln -s /usr/pgsql-9.5/bin/initdb  /usr/bin/initdb

The full Dockerfile details of Postgresql 9.5 is on github link