caiovfernandes / docker-dns-bind

Project Requirements

• docker

Quick Test

1. Run all with make:

make

2. Inside of the host1 container (already in after make):

ping host1.caio-foundation.com
# OR
ping host2.caio-foundation.com

Environments variables

export IP_RANGE=172.20.0.0
export NETWORK_NAME=caio-net
export DNS_SERVER1_IP=172.20.0.2
export DNS_SERVER2_IP=172.20.0.3
export HOST1_IP=172.20.0.4
export HOST2_IP=172.20.0.5
export DNS_IMAGE_NAME=lab01_dns_server
export HOST_IMAGE_NAME=lab01_dns_host

Docker network

1. Creating a Docker network:

docker network create --subnet=${IP_RANGE}/16 ${NETWORK_NAME}

Executing DNS_SERVERS

cd dns-server/

1. Building docker image:

docker build -t ${DNS_IMAGE_NAME} .

2. Running container

docker run -d --rm --name=dns-server --net=${NETWORK_NAME} --ip=${DNS_SERVER_IP} ${DNS_IMAGE_NAME}

3. Starting bind9 service

docker exec -d dns-server /etc/init.d/bind9 start

Running hosts

cd host/

1. Building docker image

docker build -t ${HOST_IMAGE_NAME} .

2. Running host 1

docker run -d --rm --name=host1 --net=${NETWORK_NAME} --ip=${HOST1_IP} --dns=${DNS_SERVER_IP} ${HOST_IMAGE_NAME} /bin/bash -c "while :; do sleep 10; done"

3. Running host 2

docker run -d --rm --name=host1 --net=${NETWORK_NAME} --ip=${HOST2_IP} --dns=${DNS_SERVER_IP} ${HOST_IMAGE_NAME} /bin/bash -c "while :; do sleep 10; done"

Testing Connections

• Inside the container, it is possible to verify that the host2 is reachable from the host1, using the DNS

1. Accessing host1 container:

docker exec -it host1 bash

2. Inside of host1, getting host2 IP throw the DNS_SERVER:

ping host2.caio-foundation.com