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Migration jails from ezjail

Author: Nikita Druba aka LordNicky

Original: via Issue#412

Notes: this is ZFS-only solution

Migration from ezjail with basejail to CBSD with basejail can be doing at least by this easy way:

Install CBSD and do an initial setup, like in the manual
Create an empty jail with any name, for example: "jail1", make sure, that you uncheck "astart" option.; (https://www.bsdstore.ru/en/12.0.x/wf_jcreate_ssi.html;
Stop the jail from ezjail, that you want to migrate and do a snapshot of it filesystem:
```
ezjail stop MyJail
```
```
zfs snapshot mypool/path/to/ezjail/MyJail@migrating
```
Create jail in CBSD by jconstruct-tui and put to "zfs_snapsrc" field path to snapshot of you jail:
```
mypool/path/to/ezjail/MyJail@migrating
```
Check all other fields to set same ip, name and other settings. For network you can use syntax of ezjail, but instead "|" you need to use "#".
Proceed you new jail. If creation of jail was successfully, then go to the next step
Run migrating_ezjail_cbsd.sh script from ezjail2cbsd/. You can specify paths to directories of "migrating" and "example" jails in command:
```
migrating_ezjail_cbsd.sh path/to/cbsd/jail1 path/to/cbsd/MyJail
```
or use dialog interface and enter paths there.
Run you migrated jail by cbsd command and enjoy.
Also you can be needed to destroy ezjail filesystems, but before destroying them you need to promote clones in CBSD directory:

zfs promote mypool/path/to/cbsd/MyJail

zfs destroy -r mypool/path/to/ezjail/MyJail