zfsbootcfg8

Usage

Overview

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:

zfsbootcfg "zfs:tank/ROOT/newbe:"

To clear the boot options:

zfsbootcfg ""