NAME
App::Dockerfile::Template - Make Dockerfile as Template Toolkit template file and use environment variables as data points
INSTALLATION
Install with cpan
cpan -i App::Dockerfile::TemplateInstall with cpanm
cpanm App::Dockerfile::TemplateInstall with carton
echo 'requires "App::Dockerfile::Template";' >> cpanfile
carton installUSAGE
Dockerfile example
Create a Dockerfile with varialbles
FROM [% OS_NAME || "ubuntu" %]:[% OS_VERSION || "latest" %]
ENV PLACK_ENV [% PLACK_ENV || "development" %]
ENV DB_HOST [% DB_HOST %]
ENV DB_USER [% DB_USER %]
ENV DB_PASS [% DB_PASS %]
ENV DB_NAME [% DB_NAME %]BUILD
export PLACK_ENV=prod
export DB_HOST=foo.com
export DB_USER=bar
export DB_PASS=s0m3th1ng
export DB_NAME=runtimeSame arguments with docker build command
docker-build -t foo/bar .What is behind the sense
1. Use Environment Variables with Template Toolkit to output a buildable Dockerfile
2. Run docker build the new Dockerfile with the command argumentsDATA POINTS
By default all the data points are from the environment variables.
If you need to pass in dynamic data points, there are some examples as below:
Add a function to the template to get a list of files
In the Dockerfile template
[% FOREACH file IN list %]
ADD [% file %] /home/here/[% file %]
[% END %]From the command line
docker-build =Slist 'split /\n/, qx{find . -type f}' --tag some/image .Load a File::Slurp to list the directory
In the Dockerfile template
[% FOREACH file IN list %]
ADD [% file %] /home/here/[% file %]
[% END %]From the command line
docker-build =MFile::Slurp =Slist 'read_dir(".")' --tag some/image .Add an extra key value
In the Dockerfile template
FROM base/image
AUTHOR [% author %]
...From the command line
docker-build =KVauthor "$USER <$EMAIL>" --tag some/image .