When installing OpenBSD, at the partitioning section, the installer asks which option to choose:
- Use (A)uto layout
- (E)dit auto layout
- Create (C)ustom layout
The first "a" is a good choice to rely on the default settings and save operation time at installation.
I sometimes, however, like to choose manual partitioning.
For example, using storage-limited virtual machines, I want to let the sizes of the specific mount points such as /var
and /home
as big as possible.
At such a time, "e" or "c" is also a good choice.
- "e": Use auto layout but configure it.
- "c": Create my own layout from the beginning.
The choices are followed by disklabel
running:
We can manage partitions via these commands:
? | h # show help
2.7G
p # print partitions
a [Partition Label] # add partition
d [Partition Label] # delete partition
z # delete all partitions
x # exit & lose changes
q # quit & save changes
Today, I created OpenBSD vm image for Google Compute Engine (GCE) whose storage size is limited to 30 GBytes.
I changed mount points and their sizes like these operations:
> a a # add parition labeled as 'a'
offset: [64] # just click Enter key
size: [62910476] 1.0G # set partition size
FS type: [4.2BSD] # just click Enter key
mount point: [none] / # set mount point
> a b # add parition labeled as 'b'
offset: [2104512] # just click Enter key
size: [60806028] 1.1G
FS type: [swap] # just click Enter key
# skip 'c'
> a d # add parition labeled as 'd'
...
> p # check partitions in the end
> q # save changes and exit
Finally, I changed the whole disk like this:
Partition Label | Mount Point | Before | After |
---|---|---|---|
a | / |
1.0G | 1.0G |
b | swap |
1.2G | 1.1G |
c | (unused) |
- | - |
d | /tmp |
1.7G | 1.6G |
e | /var |
2.7G | 10.0G |
f | /usr |
1.9G | 1.6G |
g | /usr/X11R6 |
0.9G | 0.3G |
h | /usr/local |
4.0G | 4.0G |
i | /usr/src |
1.7G | 1.0G |
j | /usr/obj |
5.8G | 3.0G |
k | /home |
9.1G | 6.4G |
(sum) | 30.0G | 30.0G |
Thus, I built OpenBSD on GCE and launched a small database server with its storage big enough for my usage : )
Updated:
Partition Label | Mount Point | Before | After |
---|---|---|---|
a | / |
1.0G | 0.8G |
b | swap |
1.2G | 0.8G |
c | (unused) |
- | - |
d | /tmp |
1.7G | 1.4G |
e | /var |
2.7G | 2.4G |
f | /var/www |
- | 7.6G |
f -> g | /usr |
1.9G | 1.6G |
g -> h | /usr/X11R6 |
0.9G | 0.4G |
h -> i | /usr/local |
4.0G | 3.5G |
i -> j | /usr/src |
1.7G | 1.0G |
j -> k | /usr/obj |
5.8G | 3.0G |
k -> l | /home |
9.1G | 7.5G |
(sum) | 30.0G | 30.0G |
These assignments are also good for a tiny virtual machine when serving with using Google Cloud SQL as database : )
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