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growfs(7): document addition of swap partition and growfs_fstab script

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Add documentation of the growfs script's new ability to add a swap
partition, expanding on the previous functionality as well.  Add the
growfs_fstab helper script, which runs separately.  Add a description
of how to expand a file system a second time if swap had been added.
While here, fix a typo.

Reviewed by:	pauamma
Differential Revision:	https://reviews.freebsd.org/D37465
This commit is contained in:
Mike Karels 2022-12-10 13:40:55 -06:00
parent af01b47225
commit 4e240e55d8
2 changed files with 72 additions and 11 deletions
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1
share/man/man7/Makefile
View File

@ -34,6 +34,7 @@ MAN= arch.7 \
tuning.7
MLINKS= intro.7 miscellaneous.7
MLINKS+= growfs.7 growfs_fstab.7
MLINKS+= security.7 securelevel.7
MLINKS+= c.7 c78.7
MLINKS+= c.7 c89.7

82
share/man/man7/growfs.7
View File

@ -24,46 +24,106 @@
.\"
.\" $FreeBSD$
.\"
.Dd May 3, 2020
.Dd November 22, 2022
.Dt GROWFS 7
.Os
.Sh NAME
.Nm growfs
.Nd start up script to grow the root file-system
.Nm growfs ,
.Nm growfs_fstab
.Nd start up scripts to grow the root file system and add swap
.Sh DESCRIPTION
The
.Nm
script normally runs at the first boot after system installation.
If the boot disk is larger than the root file system and boot partitions,
.Nm
can expand the root file system.
It can also add a swap partition, with a default size of 10% of the boot disk.
Swap is limited to twice the memory size up to 4 GB,
8 GB up to 8 GB of memory, and memory size over 8 GB.
It is also limited to the
.Xr sysctl 8
value of
.Li vm.swap_maxpages
divided by 2.
By default, no swap partition is created if an existing swap partition is found
or is listed in
.Pa /etc/fstab ,
or the disk is under 15 GB.
The
.Nm growfs_fstab
script adds any new swap partition to
.Pa /etc/fstab
after the root file system is made writable,
and enables its use as a dump partition.
.Pp
The following options in
.Pa /etc/rc.conf
control the behavior of
.Nm :
.Bl -tag -width ".Va growfs_enable" -offset indent
.Bl -tag -width ".Va growfs_swap_size" -offset indent
.It Va growfs_enable
.Pq Dq Li NO
If set to
.Dq Li YES ,
the first time the machine boots, the root file-system will be automatically
expanded, if possible, to fill up all available space after it.
the first time the machine boots, the root file system will be automatically
expanded, if possible, to fill up all available space after it,
after optionally adding a swap device at the end.
.It Va growfs_swap_size
.Pq Dq Li \&
If set to
.Dq Li 0 ,
the addition of a swap partition is disabled.
An empty value
.Pq Dq Li \&
allows the creation of a swap partition with the default size.
If set to another value,
the swap partition will be created with the specified size in bytes,
even if another swap partition is detected.
.El
.Pp
To expand the root file-system with-out rebooting, run the following command:
A setting for
.Va growfs_swap_size
can be set in the kernel environment, in which case it overrides
the value from
.Pa /etc/rc.conf .
.Pp
To expand the root file system without rebooting, run the following command:
.Dl % /etc/rc.d/growfs onestart
In addition, if a swap partition is added, run the command:
.Dl % /etc/rc.d/growfs_fstab onestart
Note that if a disk is expanded again,
and if the root file system had previously been expanded
and a swap partition added, it is necessary to delete the swap
partition before this procedure
in order to expand the root file system to the new size.
A new swap partition can be created during the expansion.
.Sh IMPLEMENTATION NOTES
The script requires that
.Pa awk
be present and on the path.
be present and in the path.
This usually means that
.Pa /usr
should be mounted prior to running the script.
.Sh FILES
.Pa /etc/rc.conf
.Bl -tag -compact -width Pa
.It Pa /etc/fstab
.It Pa /etc/rc.conf
.El
.Sh EXIT STATUS
.Ex -std
.Sh SEE ALSO
.Xr fstab 5 ,
.Xr rc.conf 5
.Sh HISTORY
The
.Nm
manual page first appeared in
.Fx 10.1 .
.Sh SEE ALSO
.Xr rc.conf 5
The ability to add a swap partition was added in
.Fx 14.0 .
.Sh AUTHORS
The man page and script were written by
.An John-Mark Gurney Aq Mt jmg@FreeBSD.org .
The ability to create a swap partition was added by
.An Michael Karels Aq Mt karels@FreeBSD.org .