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Simple recursive DNS server with Unbound DNS

By admin | July 30, 2020

This is a simple configuration for running a recursive DNS server (passes DNS requests to another server and caches responses) with the Unbound DNS server.

Installation (Ubuntu):

sudo apt-get install -y unbound

Open the config

sudo vim /etc/unbound/unbound.conf


Replace below with the desired upstream DNS server.

# The following line includes additional configuration files from the
# /etc/unbound/unbound.conf.d directory.
#include: "/etc/unbound/unbound.conf.d/*.conf"
# NOTE: needed to comment out the above line avoid a "status: SERVFAIL" response

    # Enable verbose debugging messages
    verbosity: 1000

    # Run on all interfaces

    # Hide the server name and version
    hide-identity: yes
    hide-version: yes

    # Who should be able to query the server
    access-control: allow

    do-ip4: yes
    do-ip6: no

    do-udp: yes
    # Enable this to support TCP DNS which is required in some applications
    do-tcp: yes

    # Allow forwarding to another DNS server (e.g. another local dnsmasq or systemd-resolve)
    do-not-query-localhost: no

    name: "."
    # Replace with your desired upstream DNS server
    # You can have multiple forward-addr lines

Starting the server

sudo systemctl restart unbound

Debugging / Troubleshooting

Query the server

dig @your_server_here

Read the DNS server log

sudo systemctl status unbound -n 50


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Topics: Linux | 7 Comments »

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