NAME

zfsbootcfg — specify zfsboot options for the next boot

SYNOPSIS

DESCRIPTION

zfsbootcfg is used to set boot.config(5)-style options to be used by gptzfsboot(8) or loader(8) the next time the machine is booted. Once gptzfsboot(8) or loader(8) reads the information, it is deleted. If booting fails, the machine automatically reverts to the previous boot configuration. The information is stored in a special boot environment area of a ZFS pool.

If used without arguments, zfsbootcfg will output the current boot configuration, if set.

The following options are supported by zfsbootcfg:

-k key

Define key for ⟨key, value⟩ pair.

-n name

Update nvlist name.

-p

Print all information stored in ZFS pool bootenv area.

-t type

Set type of value used in ⟨key, value⟩ pair. Currently supported types are:

DATA_TYPE_BYTE

 

DATA_TYPE_INT8

 

DATA_TYPE_UINT8

 

DATA_TYPE_INT16

 

DATA_TYPE_UINT16

 

DATA_TYPE_INT32

 

DATA_TYPE_UINT32

 

DATA_TYPE_INT64

 

DATA_TYPE_UINT64

 

DATA_TYPE_BOOLEAN_VALUE

 

DATA_TYPE_STRING

 

If not specified, the default is DATA_TYPE_STRING.

-v value

Define value for ⟨key, value⟩ pair.

-z pool

Operate on pool.

ENVIRONMENT

vfs.root.mountfrom

The kenv(1) variable that identifies a pool for which the options are written.

EXAMPLES

Try to boot to a new boot environment without changing the bootfs property of a pool:

To clear the boot options:

SEE ALSO

boot.config(5), bectl(8), gptzfsboot(8), loader(8)

HISTORY

zfsbootcfg appeared in FreeBSD 11.1.

AUTHORS

This manual page was written by Andriy Gapon <avg@FreeBSD.org>.