CODEWITHSUNDEEP
docker
loop0.brs
loop0.brs

Reputation: 105

Why my volume is empty?

Here is the question, when I try to build an image with my Dockerfile:

# PostgreSQL
#
# VERSION   1.0

FROM    ubuntu:12.04
VOLUME  /var/lib/postgresql
# Update the packages
RUN apt-get update
RUN apt-get -y dist-upgrade
# Install PostgreSQL
RUN apt-get -y install sudo postgresql
# Configure PostgreSQL to allow logins from all networks and listen to all ip address
RUN echo "host    all             all             0.0.0.0/0               md5" >> /etc/postgresql/9.1/main/pg_hba.conf
RUN echo "listen_addresses='*'" >> /etc/postgresql/9.1/main/postgresql.conf

EXPOSE  5432

After build the image if I try: docker run -i -t image_id /bin/bash

My /var/lib/postgresql is now empty!

Docker volumes doesn't have too much documentation so I'm really confused what's is going on.

Upvotes: 3

Views: 1450

Answers (1)

creack
creack

Reputation: 121642

If you put the VOLUME instruction at the end of your Dockerfile.

Currently Docker will create a new volume for each RUN you do and therefor discard the changes.

This will get fixed soon. In the meantime, simply move your VOLUME instruction and it will do the trick :)

Upvotes: 7

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