How to Stake on FreeBSD

FreeBSD is a very powerful operating system, it has a great history of reliability, security and stability. Here we show how it can be used to stake Hydra in a secure way.

Isolating Hydrad in a FreeBSD jail

FreeBSD jails are a very powerful feature, in summary, your jail instance is more protected as it's like having a separate OS just for Hydra with reduced privileges.

Here's a good read on Jails:

FreeBSD version used for this tutorial is 11.2, download it from the official FreeBSD mirrors:

Installing FreeBSD

Important: Make sure to install and enable NTP, it's necesary to stay synchronized to network clocks.

Install FreeBSD as normal, however, the following hardening settings are recommended during install:

Create user

Create a user with permissions "operator wheel"

Please remember to do all these commands as root



Allow sockets and upgrades in jail







firewall_myservices="22 3888"




Notice that we've added some settings for firewall, these will enable IPFW and basic settings to secure our Jail, allowing only ports 22(ssh) and 3888(Hydra) to be accessed.

Resource limits for Jails




Creating our Jail for staking

zfs create -o mountpoint=/jail zroot/jail

(Change zroot for whatever name you chose for your zfs pool)

zfs create -o mountpoint=/jail/hydra zroot/jail/hydra

Now we've created our jail for staking Hydra, let's fetch and install FreeBSD on it!

cd /jail/hydra/ && fetch -o - | tar --unlink -xpJf - -C /jail/hydra

We've now installed FreeBSD into /jail/hydra

Typing ls /jail/hydra/ should show the filesystem of our Hydra FreeBSD Jail

Now, let's create the jail configuration file:


hydra {

host.hostname = hydra.local;

ip4.addr =;

interface = em0;

path = /jail/hydra;

exec.start = "/bin/sh /etc/rc";

exec.stop = "/bin/sh /etc/rc.shutdown";






Ok now it's time to launch our jail!

service jail start hydra

We've just started our Hydra jail, We can now get into our Hydra jail to finish configuration, install Hydra and launch the wallet.

jexec hydra /bin/csh

cp /usr/share/zoneinfo/YOURTIMEZONE/ /etc/localtime This is very important, if the time info is incorrect, we'll produce orphan blocks or will be unable to sync

Create our basic /etc/rc.conf for our Hydra Jail

Hydra Jail:


syslogd_flags="-s -s"







keyrate=fast sendmail_enable=NONE




Add dns nameservers to /etc/resolv.conf

echo "nameserver" >> /etc/resolv.conf

echo "nameserver" >> /etc/resolv.conf

Installing Hydra

Now that we've got our jail up and running, we need to install Hydra. There's 2 options on doing this, we can use the pkg repository or the powerful FreeBSD ports which are usually updated faster:

pkg repository

pkg update -f pkg install -y hydra

FreeBSD ports

portsnap fetch extract cd /usr/ports/net-p2p/hydra && make install clean

The above will ask for a lot of configuration options, it might be better to use make config-recursive to set all options before compiling. If you want to use default settings just type cd /usr/ports/net-p2p/hydra && make install clean BATCH="YES"

Running Hydra

Launching Hydra is just like in any other *NIX operating system, however there's a minor difference here due to how FreeBSD jails work. First, we need to create a hydra.conf file with the following contents:

This config is necessary, otherwise calling the daemon will return errors.

Then we can launch withhydrad -daemon

Security tips

  • Set up firewall on host (you cannot setup a firewall inside a jail) and enable only the ports you need (22 and 3338) This is done in the host rc.conf at the top of this tutorial

  • Disable history, this will completely disable console history and it's a way to help secure your staking box, type the following on your FreeBSD console: unset history; unset savehist

  • Secure SSH:

    1. Disable password authentication

  • If using the FreeBSD box on your home network, force it to listen on local network only.

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