Virtualization with FreeBSD Jails, ezjail, and ZFS Dan Langille Ohio LinuxFest 2014 Short History of Dan Virtualization What is a jail? • jail • host • jail host What is ezjail? What is ZFS? What is Bacula Hardware I'm using One filesystem per jail • At least one… if not more Backups • Backup the jail filesystem from outside the jail • Snapshots • Why a snapshot? Watching the jail • You can watch a jail without being observed Creating a new jail Moving a jail Starting a jail Stopping a jail Automated IP assignment • Not DHCP Other great tools • Ansible • bsdploy Quotas • based on ZFS • what about X86BSD man limits and rctl but im not sure how they work in jails. Lies • FIBS Upgrades made easier • Copy the filesystem • Create a new jail based on the copy • Upgrade that copy • Test How can you do that? • IP address conflicts between production and test? • Don’t use public IP addresses on the jail • Use firewall redirects via pf(4) Jails as playgrounds • Playgrounds: want to test a new app? • Deploy it into a new jail knowing you can delete it later, leaving no cruft. Jails for testing • Need to test? • Have a known starting point • Rollback after testing Jails for dev • Need a new dev environment? • Create a new jail based on a known template • Pre populated with the required apps • Destroy it when done • Create another when required Not everyone likes ezjail • claim issues with upgrades • I’ve tried upgrading, wasn’t as hard as I initially thought
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