Create jail clones from OpenZFS snapshots
1. Creating a Thin Jail Using OpenZFS Snapshots
https://docs.freebsd.org/en/books/handbook/jails/#creating-thin-jail-openzfs-snapshots
Start all configured jails at system boot:
# sysrc jail_enable="YES" # sysrc jail_parallel_start="YES"
Create datasets for the jail directories:
# zfs create -o mountpoint=/usr/local/jails zroot/jails # zfs create zroot/jails/media # zfs create zroot/jails/templates # zfs create zroot/jails/containers
1.1. Create template jail "ZFS snapshot"
Fetch and patch base, then create snapshot for future clones
# fetch https://download.freebsd.org/ftp/releases/amd64/amd64/13.2-RELEASE/base.txz -o /usr/local/jails/media/13.2-RELEASE-base.txz # tar -xf /usr/local/jails/media/13.2-RELEASE-base.txz -C /usr/local/jails/templates/13.2-RELEASE --unlink # freebsd-update -b /usr/local/jails/templates/13.2-RELEASE/ fetch install # zfs snapshot zroot/jails/templates/13.2-RELEASE@base
1.2. Create new jail "ZFS clone" from template
Clone from snapshot
# zfs clone zroot/jails/templates/13.2-RELEASE@base zroot/jails/containers/thinjail
Copy essential configuration files (OPTIONAL)
# cp /etc/resolv.conf /usr/local/jails/containers/thinjail/etc/resolv.conf # cp /etc/localtime /usr/local/jails/containers/thinjail/etc/localtime
Create a jail configuration file for the newly created jail in /etc/jail.conf.d:
# ls /etc/jail.conf.d/ thinjail.conf
Start the jail:
# service jail start thinjail
2. Jail Upgrading
https://docs.freebsd.org/en/books/handbook/jails/#jail-upgrading
Upgrade jail to latest patch release:
# freebsd-update -j thinjail fetch install # service jail restart thinjail
Upgrade jail to new major or minor release:
- First upgrade and reboot Host
- then upgrade jail:
# freebsd-update -j thinjail -r 13.2-RELEASE upgrade # freebsd-update -j thinjail install # service jail restart thinjail # freebsd-update -j thinjail install # service jail restart thinjail