Run i2pd in a Docker container on CentOS 7

On Habrahabr there is great article on i2pd. The only drawback of the project is that its authors provide packages only for Ubuntu and Debian, which is a certain inconvenience for CentOS users.

An owner of a home NAS on CentOS 7 like me can either build i2pd from source or use Docker, to install it over the Debian Jessie image.

So, the article is devoted to creating a container with i2pd in Docker under CentOS 7.

Installing Docker

Docker has its own repository with the latest versions. To connect it, let's create it in the directory /etc/yum.repos.d file docker.repo with the following content:

[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg

Then install the package we need:

$ sudo yum install docker
$ sudo yum install docker-engine
$ sudo systemctl enable docker.service
$ sudo systemctl start docker

Now you can check the installation is correct:

$ sudo docker run --rm hello-world

And if everything is ok, then all we have to do is add the user who will dabble in containers to the docker group:

$ sudo usermod -aG docker cube

Creating an image

To do this we need to create a file Dockerfile with the following content:

FROM debian:jessie
MAINTAINER Cube <kyb.6.granei@yandex.ru>

# Эти порты нужны для того, чтобы наш контейнер был доступен
# как прокси и у нас был бы доступ на его консоль
EXPOSE 4444 4447 7070 9439

# Обновим образ
RUN apt-get update && apt-get upgrade

# Установим зависимости i2pd
RUN apt-get install -y  wget                \
            libboost-date-time1.55.0        \
            libboost-filesystem1.55.0       \
            libboost-program-options1.55.0  \
            libboost-system1.55.0           \
            libminiupnpc10

# Скачаем последнюю версию i2pd и установим пакет
RUN cd /tmp && wget https://github.com/PurpleI2P/i2pd/releases/download/2.9.0/i2pd_2.9.0-1jessie1_amd64.deb
RUN dpkg -i /tmp/i2pd_2.9.0-1jessie1_amd64.deb
RUN rm /tmp/i2pd_2.9.0-1jessie1_amd64.deb

# Делаем пользователя i2pd доступным - назначаем
# ему рабочий shell
RUN usermod -s /bin/bash i2pd 

# Копируем конфиг i2pd и файл с подписками 
# внутрь контейнера
COPY i2pd.conf /etc/i2pd/i2pd.conf
COPY subscriptions.txt /etc/i2pd/subscriptions.txt 

# Определяем точку входа нашего контейнера.
# Эта команда запустится при его запуске
ENTRYPOINT exec su - i2pd -c "/usr/sbin/i2pd --conf ~/i2pd.conf"

There should be two files next to the Dockerfile.

• i2pd.conf (the config is working, but if you wish, you can fix it to your liking):

log = stdout

daemon = false
service = false

## Port to listen for connections
## By default i2pd picks random port. You MUST pick a random number too,
## don't just uncomment this
port = 9439 

## Enable communication through ipv4
ipv4 = true

## Enable communication through ipv6
ipv6 = true

## Bandwidth configuration
## L limit bandwidth to 32Kbs/sec, O - to 256Kbs/sec, P - to 2048Kbs/sec,
## X - unlimited
## Default is X for floodfill, L for regular node
bandwidth = O

## Router will be floodfill
# floodfill = true

[http]
## Uncomment and set to 'false' to disable Web Console
enabled = true
## Address and port service will listen on
address = 0.0.0.0
port = 7070

[httpproxy]
## Uncomment and set to 'false' to disable HTTP Proxy
enabled = true
## Address and port service will listen on
address = 0.0.0.0
port = 4444
## Optional keys file for proxy local destination
# keys = http-proxy-keys.dat

[socksproxy]
## Uncomment and set to 'false' to disable SOCKS Proxy
enabled = true
## Address and port service will listen on
address = 0.0.0.0
port = 4447

• subscriptions.txt is a file with subscriptions

http://inr.i2p/export/alive-hosts.txt
http://stats.i2p/cgi-bin/newhosts.txt
http://i2p-projekt.i2p/hosts.txt
http://i2host.i2p/cgi-bin/i2hostetag
http://no.i2p/export/alive-hosts.txt
http://rus.i2p/hosts.txt
http://udhdrtrcetjm5sxzskjyr5ztpeszydbh4dpl3pl4utgqqw2v4jna.b32.i2p/hosts.txt

Now let's run the command to create our image. Docker will automatically download and install the required layers:

$ docker build -t i2pd .

Launching the container

$ docker run --name=i2pd  -td -p 7070:7070 -p 4444:4444 -p 4447:4447 -p 9439:9439 i2pd

key -p indicates which ports to open to the outside, and -td starts a process in the background, while it continues to write logs to stdout, which is a standard practice when using containers and allows you to conveniently view its output with the command:

$ docker logs -t i2pd

After launch, the console of our i2pd is available via port 7070, and http- and socks-proxy by port 4444 And 4447 respectively.

For the lazy

For those who don’t want to create a container themselves, I made a ready-made one on Docker hub. It is installed with one command:

$ docker pull hexaedron/i2pd

It starts in exactly the same way as described above.

Conclusion

I'll finish the article link to github — there is the Dockefile itself, a couple of scripts for starting and stopping and configs. I hope the information is useful to someone. I will be glad to constructive criticism.