How to resize a Gokrazy SD card
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I have a Raspberry Pi embedded into my main shellbox. This allows me to have a built-in device that lets me do things like act as a serial terminal of last resort for my tower. It's powered by a Molex to USB-A cable (which is about the most cursed cable I have ever used) and probably benefits from the absolutely overkill tier Noctua cooler that I put on that board.
Recently I decided to put GoToSocial on that Raspberry Pi to see if it would work in Gokrazy. Turns out it does! I also installed minio on there to act as an S3 compatible storage solution and it's basically a little social network in a box.
This will be discussed in greater detail in a future post.
However, there was only one problem. I set up my Gokrazy node with a 64 GB SD card because that's what I had laying around. Given that social media stuff can take a lot of data, I wanted to upgrade it to a 512 GB SD card so that I didn't have to care about it for a while. I also wanted to make a backup of the XeDN bucket onto the Raspi as well as another one I'd mail to a friend.
Here's how I copied the data over to the new SD card.
First, I plugged both SD cards into my shellbox over the front panel USB. My SD card reader had support for both a Micro SD card and a normal SD card, so I plugged the 64 GB card into a SD-uSD adaptor and had both of them connected. If you only have one SD card slot to play with, you can also copy the data to a file as an intermediate step.
Once they were plugged in (the old one was chosen to be /dev/sde and the new one was chosen to be /dev/sdd), I copied the data over with dd(1):
sudo dd if=/dev/sde of=/dev/sdd bs=4M status=progress
if= is the input file and the
of= is the output
file. These can be any files you want, even normal files on the
disk. If you SD card reader doesn't have two slots, you will have to
set the output file to somewhere on the disk, and then use that file
as the input file for the next run. It'd be something like:
sudo dd if=/dev/sde of=./sdcard.img bs=4M status=progress
sudo dd if=./sdcard.img of=/dev/sde bs=4M status=progress
Keep in mind that when you're running
dd commands like this, you are
basically working without guardrails or handbrakes. You need to be
absolutely certain that you are dealing with the correct devices.
You can check these by using the
lsblk lets you see the storage "block" devices that are connected
to a Linux machine. For example, here's what you could see on a
Linux machine's NVME drive:
$ lsblk /dev/nvme0n1
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
nvme0n1 259:0 0 931.5G 0 disk
├─nvme0n1p1 259:1 0 923G 0 part
├─nvme0n1p2 259:2 0 8G 0 part [SWAP]
└─nvme0n1p3 259:3 0 511M 0 part /boot
dmesg lets you see the kernel log buffer. You may want to run it
-w so that you can continuously watch the changes. When
figuring out which SD card was which, I used
dmesg -w to look for
new block storage devices being connected, and then
figure out which one was the old/new one. Gokrazy sets up 4
partitions (boot, root A, root B, and persistent storage), so you
can also use that to help you figure out which is which.
The data copy took at least half an hour, which I left running while playing some Pokemon Infinite Fusion.
Once it was done, I ran the
sync command for good measure and
disconnected my SD card reader. Then I removed the old SD card and
plugged the reader back in. After running the
lsblk command, I knew
I was good.
Now I needed to resize the partition at /dev/sdd4. I installed growpart from the cloud-utils package and ran it on the SD card:
sudo growpart /dev/sdd 4
This grew the GPT tables for the SD card to fit the new size. Next I
needed to run a filesystem check on the storage partition and resize
sudo e2fsck -f /dev/sdd4
sudo resize2fs /dev/sdd4
After that finished, I test-mounted the storage drive on
and unmounted it. Everything worked great. I took out the SD card from
my shellbox, popped the new card into the raspi, booted it up and bam:
512 GB of storage:
Stay tuned, I have plans.
Facts and circumstances may have changed since publication. Please contact me before jumping to conclusions if something seems wrong or unclear.