For this to respond we need to install WebStation. Pi-Hole will redirect blocked DNS names to the IP of the Synology NAS. Alternatively you can use the INTERFACE environment variable to be more specific.
Values in the 8000 range are pretty good.Īn optional 4th can be WEBPASSWORD which allows you to set the password used in the UI.ĭNSMASQ_LISTENING is required as the image runs dnsmasq listening to the en0 interface which does not exist when using host networking on the Synology NAS. WEB_PORT is set to any port that you would like the admin console on.DNSMASQ_LISTENING is set to local so that our DNS server will respond.ServerIP is the IP address of your NAS.Lastly we configure 3 environment variables. The file contains (using googles dns servers): nameserver 127.0.0.1
My work around was to create my own file named nf and map this as a volume over the one inside the pihole container. The official way to do this is to specify the -dns 127.0.0.1 during the docker run startup however as we are using the Synology UI we are unable to do this. The latest image of Debian requires that the name servers configured has localhost first otherwise pihole fails to startup. Port settingsĪs we are sharing the network with the host there are no port mapping requirements. We do this so that Pi-Hole will be receiving the DNS requests direct and not relayed via Docker. Host networkingįirstly is that we are going to use the same network as the host. Once you have created your container from the latest tagged image there are a few steps in the docker wizard that are important. I originally used the Alpine version of this image due to it being smaller, however, as this is no longer maintained we will install the latest Debian version. Below is how I achieve this, enjoy.Īll information relating to the pi-hole docker image and extra configuration can be found on it’s home page. Whilst this worked I was never completely happy with this approach as I never want to modify system files as you can never be sure.Īfter a little work and a few updates to the Pi-Hole docker image I feel this is now possible without modification. When I first wrote about installing Pi-Hole inside Docker on my Synology NAS I came up with a solution that required a little modification to the standard DSM (see: Freeing up port 80 on Synology DSM).
Update This post was updated in January 2018 and details how to get the Debian version of pihole-docker running as the Alpine version is no longer supported. When you open the browser and navigate to the Docker host on port 8080, you will see Jenkins up and running.Update 2 I’ve created a new post which shows a different method, the one that I currently use. The left-hand side of the port number mapping is the Docker host port to map to and the right-hand side is the Docker container port number. So, you need to run the following command − To run Jenkins and map the ports, you need to change the Docker run command and add the ‘p’ option which specifies the port mapping. One is the data port of 8080 and the other is the control port of 50000. If we observe the output, we can see that there is a section of "ExposedPorts" and see that there are two ports mentioned. The output of the inspect command gives a JSON output. The low-level information of the image or container in JSON format. SyntaxĬontainer/Image − The container or image to inspect This method allows one to return low-level information on the container or image. Let’s now learn more about this inspect command. Step 6 − To understand what ports are exposed by the container, you should use the Docker inspect command to inspect the image. Step 5 − Now go to the Ubuntu server and run the command −
This will be used to download the Jenkins Image onto the local Ubuntu server.
Step 4 − If you scroll down on the same page, you can see the Docker pull command. Step 3 − Next, let’s browse and find the Jenkins image. Step 2 − Once you have signed up, you will be logged into Docker Hub. Step 1 − First, you need to do a simple sign-up on Docker Hub. We are then going to map the Jenkins port number to the port number on the Docker host. In our example, we are going to download the Jenkins container from Docker Hub. Let’s look at an example of how this can be achieved. When you run a container, if you want to access the application in the container via a port number, you need to map the port number of the container to the port number of the Docker host.
In Docker, the containers themselves can have applications running on ports.