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ZFS Datasets Migration

From version 1.1.4 ZFS Datasets support was added to jailmaker. By default starting in v1.1.4, jailmaker will create a separate dataset for each jail if possible. This allows the user to configure snapshots, rollbacks, replications etc.

Jailmaker operates in dual-mode: it supports using both directories and datasets. If the 'jailmaker' directory is a dataset, it will use datasets, if it is a directory, it will use directories.

Procedure to migrate from directories to ZFS Datasets

Stop all jails

jlmkr stop jail1

jlmkr stop jail2 etc..

Move/rename the 'jailmaker' directory

mv jailmaker orig_jailmaker

Create the ZFS datasets for jailmaker

Create all the required datasets via GUI or CLI.

You need to create the following datasets:

jailmaker

jailmaker/jails

And one for each existing jail:

jailmaker/jails/jail1

jailmaker/jails/jail2 etc.

Via CLI:

zfs create mypool/jailmaker
zfs create mypool/jailmaker/jails
zfs create mypool/jailmaker/jails/jail1
zfs create mypool/jailmaker/jails/jail2

Move the existing jail data into the newly created datasets

Now move all the jail data:

rsync -av orig_jailmaker/ jailmaker/

Warning! It's important that both directories have the / at the end to make sure contents are copied correctly. Otherwise you may end up with jailmaker/jailmaker

Test everything works

If everything works, you should be able to use the jlmkr command directly. Try doing a jlmkr list to check if the jails are correctly recognized

You can also try creating a new jail and see that the dataset is created automatically.

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