Staking Htmlcoin 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 Htmlcoin in a secure way.
Isolating Qtumd 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 Htmlcoin with reduced privileges.
Here's a good read on Jails: https://www.freebsd.org/doc/handbook/jails.html
FreeBSD version used for this tutorial is 11.2, download it from the official FreeBSD mirrors:
Important: Make sure to install and enable NTP, it's necessary to stay synchronized to network clocks.
Install FreeBSD as normal, however, the following hardening settings are recommended during install:
Create a user with permissions "operator wheel"
Please remember to do all these commands as root
Allow sockets and upgrades in jail
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 4888(Htmlcoin) 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/htmlcoin zroot/jail/htmlcoin
Now we've created our jail for staking Htmlcoin, let's fetch and install FreeBSD on it!
cd /jail/htmlcoin/ && fetch -o - http://ftp.freebsd.org/pub/FreeBSD/releases/amd64/11.2-RELEASE/base.txz | tar --unlink -xpJf - -C /jail/htmlcoin
We've now installed FreeBSD into /jail/qtum
Typing ls /jail/htmlcoin/ should show the filesystem of our Htmlcoin FreeBSD Jail
Now, let's create the jail configuration file:
host.hostname = htmlcoin.local;
ip4.addr = 192.168.0.99;
interface = em0;
path = /jail/htmlcoin;
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 htmlcoin
We've just started our Htmlcoin jail, We can now get into our Htmlcoin jail to finish configuration, install Htmlcoin and launch the wallet.
jexec qtum /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 Htmlcoin Jail
Add dns nameservers to /etc/resolv.conf
echo "nameserver 220.127.116.11" >> /etc/resolv.conf
echo "nameserver 18.104.22.168" >> /etc/resolv.conf
Now that we've got our jail up and running, we need to install Htmlcoin. There's 2 options on doing this, we can use the pkg repository or the powerful FreeBSD ports which are usually updated faster:
pkg update -f pkg install -y htmlcoin
portsnap fetch extract cd /usr/ports/net-p2p/htmlcoin && 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/htmlcoin && make install clean BATCH="YES"
Launching Htmlcoin 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 htmlcoin.conf file with the following contents:
This config is necessary, otherwise calling the daemon will return errors.
Then we can launch with htmlcoind -daemon
Set up firewall on host (you cannot setup a firewall inside a jail) and enable only the ports you need (22 and 4888) 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
Disable password authentication
If using the FreeBSD box on your home network, force it to listen on local network only.