vsftpd

Very Secure File Transfer Protocol

How to build the container

docker build -t vsftpd .

How to use the container

Configuration

Vsftpd server uses a config file (/etc/vsftpd/vsftpd.conf) on the host, this file needs to be created first.

Example config file can be found here.

For default config file, run this command before running container as advised in example usage:

$ id=$(docker create vsftpd)
$ docker cp $id:/etc/vsftpd/vsftpd.conf <path-to-destination>
$ docker rm -v $id

For the container to function correctly, background=NO has to be specified in the conf file.

Example usage:

$ docker run -p 20:20 -p 21:21 -p 21100-21110:21100-21110 \
--rm -v /etc/vsftpd/:/etc/vsftpd/ \
-v <shared files directory>:/var/ftp/pub \
--name vsftpd vsftpd

Running in passive mode

Add following lines to the configuration file:

pasv_enable=Yes
pasv_max_port=10100
pasv_min_port=10090

Find your zone. In this case, zone is 'public':

# firewall-cmd --get-active-zones
public
  interfaces: eth0

Open files on firewall:

# firewall-cmd --permanent --zone=public --add-port=10090-10100/tcp
# firewall-cmd --reload

Run the container:

$ docker run -P \
--rm -v /etc/vsftpd/:/etc/vsftpd/ \
--name vsftpd vsftpd

Extending using source-to-image

You are able to extend this container image using source-to-image:

• supply a custom script which will be executed before running vsftpd
• supply a configuration file on your own

In order to extend the image using s2i, you need to prepare a directory with following structure:

$ tree vsftpd-extension
vsftpd-extension
├── init-hook
└── vsftpd.conf

There is a sample extension directory provided in this repo, named ./default-conf.

Both files are optional. But you should supply at least one, what would be the point of supplying neither, right?

The file init-hook will be sourced using default shell. You can take a look at a sample init hook at default-conf directory and use it:

$ git clone https://github.com/container-images/vsftpd && cd vsftpd

$ sudo s2i build $PWD/default-conf modularitycontainers/vsftpd new-vsftpd
I0915 14:46:16.578040 02356 install.go:251] Using "assemble" installed from "image:///usr/local/s2i/assemble"
I0915 14:46:16.578125 02356 install.go:251] Using "run" installed from "image:///usr/local/s2i/run"
I0915 14:46:16.578184 02356 install.go:251] Using "save-artifacts" installed from "image:///usr/local/s2i/save-artifacts"
/opt/app-root/src
'/tmp/src/init-hook' -> './init-hook'
'/tmp/src/vsftpd.conf' -> './vsftpd.conf'

The files are copied into the new container image named new-vsftpd, we can run it now:

$ sudo docker run new-vsftpd
This is an example init hook.
You can put your custom logic here.
Configuration file: ./vsftpd.conf

And as you can see, our init script was sourced and vsftpd is now running using our config file.

Running on OpenShift

See reference guide: https://blog.openshift.com/getting-any-docker-image-running-in-your-own-openshift-cluster/