How to set up FreeBSD 12 VNET jail with ZFS

To set up a FreeBSD 12 VNET jail with ZFS, you will need to create a ZFS dataset for the jail and configure the jail using the jail command.

1. First, create a ZFS dataset for the jail by running the following command:

zfs create -o mountpoint=/jails/jailname tank/jails/jailname

Replace jailname with the name of your jail.

2. Next, create a configuration file for the jail in the /etc/jail.conf directory. For example, to create a jail with the name jailname, the IP address 192.168.0.100, and the ZFS dataset tank/jails/jailname, the configuration file would look like this:

jailname {
    host.hostname = "jailname";
    ip4.addr = 192.168.0.100;
    path = "/jails/jailname";
    zfs = "tank/jails/jailname";
}

3. To create the jail, run the following command:

jail -c jailname

This will create the jail using the configuration specified in the /etc/jail.conf file.

4. To start the jail, run the following command:

jail -r jailname

The jail should now be running. You can log in to the jail using jexec:

jexec jailname /bin/csh

Keep in mind that you will need to configure networking and install any necessary packages within the jail. You can do this by using the pkg command or by manually compiling and installing software from the ports tree.

You can also use the jail command to manage the jail, such as stopping, starting, or destroying it. For example, to stop the jail, you can use the following command:

jail -e jailname