reboot(1M) System Administration Commands reboot(1M)NAMEreboot - restart the operating system
SYNOPSIS
/usr/sbin/reboot [-dlnq] [boot_arguments]
/usr/sbin/reboot [-f [-e environment] | -p] [-dlnq] [boot_arguments]
DESCRIPTION
The reboot utility restarts the kernel. The kernel is loaded into mem‐
ory by the PROM monitor, which transfers control to the loaded kernel.
On x86 systems, when the -f flag is specified, the running kernel will
load the next kernel into memory, then transfer control to the newly
loaded kernel. This form of reboot is shown in the second synopsis,
above.
Although reboot can be run by the super-user at any time, shutdown(1M)
is normally used first to warn all users logged in of the impending
loss of service. See shutdown(1M) for details.
The reboot utility performs a sync(1M) operation on the disks, and then
a multi-user reboot is initiated. See init(1M) for details. On x86 sys‐
tems, reboot may also update the boot archive as needed to ensure a
successful reboot.
The reboot utility normally logs the reboot to the system log daemon,
syslogd(1M), and places a shutdown record in the login accounting file
/var/adm/wtmpx. These actions are inhibited if the -n or -q options are
present.
Normally, the system reboots itself at power-up or after crashes.
OPTIONS
The following options are supported:
-d
Force a system crash dump before rebooting. See dumpadm(1M) for
information on configuring system crash dumps.
-e
If -f is present, reboot to the specified boot environment.
-f
Fast reboot, bypassing firmware and boot loader. The new kernel
will be loaded into memory by the running kernel, and control will
be transferred to the newly loaded kernel. If disk or kernel argu‐
ments are specified, they must be specified before other boot argu‐
ments.
This option is currently available only on x86 systems.
Service svc:/system/boot-config:default is enabled by default. It
requires solaris.system.shutdown as action_authorization and
value_authorization. When the config/fastreboot_default property is
set to true, reboot will behave as reboot-f. The value of this
property can be changed using svccfg(1M) and svcadm(1M), to control
the default reboot behavior.
See EXAMPLES for details.
-l
Suppress sending a message to the system log daemon, syslogd(1M)
about who executed reboot.
-n
Avoid calling sync(2) and do not log the reboot to syslogd(1M) or
to /var/adm/wtmpx. The kernel still attempts to sync filesystems
prior to reboot, except if the -d option is also present. If -d is
used with -n, the kernel does not attempt to sync file systems.
-p
Reboot to prom. This flag can be used to reboot the system through
firmware without changing the default reboot behavior as denoted by
the config/fastreboot_default property setting in system/boot-con‐
fig service.
This option is currently available only on x86 systems. The -p and
-f options are mutually exclusive.
-q
Quick. Reboot quickly and ungracefully, without shutting down run‐
ning processes first.
OPERANDS
The following operands are supported:
boot_arguments
An optional boot_arguments specifies arguments to the uadmin(2)
function that are passed to the boot program and kernel upon
restart. The form and list of arguments is described in the
boot(1M) and kernel(1M) man pages.. If the arguments are specified,
whitespace between them is replaced by single spaces unless the
whitespace is quoted for the shell. If the boot_arguments begin
with a hyphen, they must be preceded by the -- delimiter (two
hyphens) to denote the end of the reboot argument list.
EXAMPLES
Example 1 Passing the -r and -v Arguments to boot
In the following example, the delimiter -- (two hyphens) must be used
to separate the options of reboot from the arguments of boot(1M).
example# reboot-dl -- -rv
Example 2 Rebooting Using a Specific Disk and Kernel
The following example reboots using a specific disk and kernel.
example# reboot disk1 kernel.test/unix
Example 3 Fast Rebooting
The following examples use the -f option to perform fast reboots.
If service svc:/system/boot-config:default is enabled and property con‐
fig/fastreboot_default is set to true, the -f option can be omitted.
The following command reboots to the default entry in the GRUB (see
grub(5)) menu file menu.lst.
example# reboot-f
The following command reboots to another UFS root disk.
example# reboot-f -- '/dev/dsk/c1d0s0'
The following command reboots to another ZFS root pool.
example# reboot-f -- 'rpool/ROOT/root2'
The following command reboots to mykernel on the same disk with -k
option.
example# reboot-f -- '/platform/i86pc/mykernel/amd64/unix -k'
The following command reboots to mykernel off another root disk mounted
on /mnt.
example# reboot-f -- '/mnt/platform/i86pc/mykernel/amd64/unix -k'
The following command reboots to /platform/i86pc/kernel/$ISADIR/unix on
another boot environment named second_root.
example# reboot-f -e second_root
The following command reboots to the same kernel with -kv options.
example# reboot-f -- '-kv'
The following commands disable the fast-reboot-by-default behavior.
example# svccfg -s "system/boot-config:default" \
setprop config/fastreboot_default=false
example# svcadm refresh svc:/system/boot-config:default
The following commands re-enable the fast-reboot-by-default behavior.
example# svccfg -s "system/boot-config:default" \
setprop config/fastreboot_default=true
example# svcadm refresh svc:/system/boot-config:default
Example 4 Rebooting to a Particular GRUB Menu
The following commands will reboot to entry 2 in the GRUB menu.
example# bootadm list-menu
the location for the active GRUB menu is: /rpool/boot/grub/menu.lst
default 0
timeout 10
0 zfsbe1
1 zfsbe1 failsafe
2 zfsbe2
3 zfsbe2 Solaris xVM
4 zfsbe2 failsafe
example# reboot 2
FILES
/var/adm/wtmpx
login accounting file
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │SUNWcs │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOmdb(1), boot(1M), dumpadm(1M), fsck(1M), halt(1M), init(1M), ker‐
nel(1M), shutdown(1M), svcadm(1M), svccfg(1M), sync(1M), syslogd(1M),
sync(2), uadmin(2), reboot(3C), attributes(5), grub(5)NOTES
The reboot utility does not execute the scripts in /etc/rcnum.d or exe‐
cute shutdown actions in inittab(4). To ensure a complete shutdown of
system services, use shutdown(1M) or init(1M) to reboot a Solaris sys‐
tem.
SunOS 5.11 24 Aug 2009 reboot(1M)
