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This section describes the various methods of installing Grendel.

Install the pre-compiled binary

Download from the Grendel releases page.

tar.gz archive

$ tar xvzf grendel-VERSION-linux-x86_64.tar.gz 

deb, rpm packages

$ sudo dpkg -i grendel_VERSION_amd64.deb
$ sudo rpm -ivh grendel-VERSION-amd64.rpm


Stock ubuntu runs a local stub dns resolver bound to port 53 that can conflict with Grendel. If you want to run Grendel's built in dns server you will have to free up this port.

How to free up port 53 used by systemd-resolved

  • Check if port 53 is in use on your system
$ sudo lsof -i :53
systemd-r 1261 systemd-resolve   13u  IPv4  28862      0t0  UDP localhost:domain
systemd-r 1261 systemd-resolve   14u  IPv4  28863      0t0  TCP localhost:domain (LISTEN)
  • Edit /etc/systemd/resolved.conf:
# Set this to the DNS server you want to use

# Set this to no
  • Update symlink:
$ sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf
  • reboot