It is standard FreeNAS's filesystem, as I saw in nanobsd.sh it is UFS1 with soft-updates. Today I have firmware upgraded a freenas, after booting it has a clean root filesystem. I will check it for errors periodically. The case today was that I saw core dumps from periodic cron job alert.py. I have 3x 3TB drives in RAIDZ forming a ZFS pool in FreeNAS. Unfortunately last night I noticed one of the drives had died. I can go into more details, but to avoid confusion my initial question is if there is a method for moving the 2 existing drives to a new FreeNAS system to recover the pool (while also planning on getting a new 3TB drive to rebuild the RAID of course).

Warning

This section describes installing and using jails on FreeNAS^®version 11.2 or later. Any jails created with a previous version ofFreeNAS^® must be managed with the Legacy Web Interface.

Jails are a lightweight, operating-system-level virtualization.One or multiple services can run in a jail, isolating those servicesfrom the host FreeNAS^® system. FreeNAS^® uses theiocage utility for jailmanagement. Jails are also used as the basis for FreeNAS^®Plugins.The main differences between a user-created jail and a plugin are thatplugins are preconfigured and usually provide only a single service.

By default, jails run theFreeBSDoperating system. These jails are independent instances of FreeBSD.The jail uses the host hardware and runs on the host kernel, avoidingmost of the overhead usually associated with virtualization. The jailinstalls FreeBSD software management utilities so FreeBSD packages orports can be installed from the jail command line. This allows forFreeBSD ports to be compiled and FreeBSD packages to be installed fromthe command line of the jail.

It is important to understand that users, groups, installed software,and configurations within a jail are isolated from both the FreeNAS^®host operating system and any other jails running on that system.

During creation, set the VNET option to providethe jail with an independent networking stack. The jail is then ableto broadcast an IP address, which is required by some applications.

The ability to create multiple jails offers flexibilityregarding software management. For example, an administrator canchoose to provide application separation by installing differentapplications in each jail, to create one jail for all installedapplications, or to mix and match how software is installed into eachjail.

14.1. Jail Storage¶

A pool must be created before using jails orPlugins. Make sure the pool has enough storage for all theintended jails and plugins. TheJailsscreen displays a message and button to CREATE POOL if nopools exist on the FreeNAS^® system.

Multiple pools can be activated to store iocage jails and plugins. Aftera pool is created, theJailspage displays an Activated Pool section. This shows whichpool and iocage dataset is active with FreeNAS^®. Click CONFIGto view the option to choose another pool or dataset to activate withiocage. ACTIVATE another pool to refresh theJailslist with any jails that exist on the chosen pool or dataset.

Jails and downloaded FreeBSD release files are stored in a dataset namediocage/.

Notes about the iocage/ dataset:

At least 10 GiB of free space is recommended.
Cannot be located on a Share.
iocageautomatically uses the first pool that is not a root pool for theFreeNAS^® system.
A defaults.json file contains default settings used whena new jail is created. The file is created automatically if notalready present. If the file is present but corrupted,iocage shows a warning and uses default settings frommemory.
Each new jail installs into a new child dataset of iocage/.For example, with the iocage/jails dataset in pool1,a new jail called jail1 installs into a new dataset namedpool1/iocage/jails/jail1.
FreeBSD releases are fetched as a child dataset into the/iocage/download dataset. This datset is then extracted intothe /iocage/releases dataset to be used in jail creation. Thedataset in /iocage/download can then be removed withoutaffecting the availability of fetched releases or an existing jail.
iocage/ datasets on activated pools are independent of eachother and do not share any data.

14.2. Creating Jails¶

FreeNAS^® has two options to create a jail. The Jail Wizardmakes it easy to quickly create a jail. ADVANCED JAIL CREATIONis an alternate method, where every possible jail option is configurable.There are numerous options spread across four different primarysections. This form is recommended for advanced users with very specificrequirements for a jail.

14.2.1. Jail Wizard¶

New jails can be created quickly by going toJails ➞ADD.This opens the wizard screen shown inFigure 14.2.1.

The wizard provides the simplest process to create and configurea new jail. Enter a Jail Name. Jail names canonly contain alphanumeric characters (Aa-Zz, 123),dashes (-), underscores (_), and periods(.). Choose the version of FreeBSD to install for this jail.Previously downloaded versions display (fetched) next totheir entry in the list.

Click NEXT to see a simplified list of networking options.The jail can be set to automatically configure IPv4 with DHCPand VNET or IPv4 and IPv6 can be configured manually.Multiple interfaces are supported in the IPv4 Address andIPv6 Address fields by entering a comma delimited list ofinterfaces, addresses, and netmask in the formatinterface|ipaddress/netmask.

Click NEXT to view a summary screen of the chosen jailoptions. Click SUBMIT to create the new jail. After a fewmoments, the new jail is added to the primary jails list.

Tip

Versions of FreeBSD are downloaded the first time they areused in a jail. Additional jails created with the same version ofFreeBSD are created faster because the download has already beencompleted.

14.2.2. Advanced Jail Creation¶

The advanced jail creation form is opened by clickingJails ➞ADDthen Advanced Jail Creation. The screen inFigure 14.2.2 is shown.

A usable jail can be quickly created by setting only the requiredvalues, the Jail Name and Release. Additionalsettings are in the Jail Properties,Network Properties, and Custom Propertiessections. Table 14.2.1shows the available options of the Basic Properties ofa new jail.

Table 14.2.1 Basic Properties¶
Setting	Value	Description
Name	string	Required. Jail names can only contain alphanumeric characters (`Aa-Zz`, `123`),dashes (`-`), underscores (`_`), and periods (`.`).
Release	drop-down menu	Required. Choose the version of FreeBSD to download and install for the jail. Previously downloadedversions of FreeBSD display `(fetched)` next to the entry in the list and do not need to befetched again.
DHCP AutoconfigureIPv4	checkbox	Automatically configure IPv4 networking with an independent VNET stack. VNET andBerkeley Packet Filter must also be checked. If not set

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