Hi Peter.
Correct, extending the life of the SD card is my goal.
I am currently rebuilding my weewx Raspberry Pi system because of
a suspected SD card failure.
I had 2 local Linux users tell me that the symptoms are
consistent with an SD card corruption.
The card is only 9 months old, and it's not bottom-of-the barrel
quality!
I reached out for help 2 weeks ago and got zero responses.
see:
https://forums.raspberrypi.com/viewtopic.php?p=1979221&hilit=kernel+panic#p1979221
<https://forums.raspberrypi.com/viewtopic.php?p=1979221&hilit=kernel+panic#p1979221>
On Saturday, March 12, 2022 at 3:35:06 PM UTC-6
peterq...@gmail.com wrote:
If you're wanting a ramdisk because SD cards are unreliable,
I wouldn't bother. There is plenty of history of people
running Weewx on Raspberry Pis for many years without a
problem with corrupted SD cards.
On Sat, Mar 12, 2022 at 12:55 PM vince <vince...@gmail.com>
wrote:
I would try 'mkdir /home/weewx/public_html/forecast' so
the parent directory exists when weewx tries to write it.
I'd also add that doing it your way means your NOAA files
will be recreated every time it boots, which could take
ages if you have many years of info like many of us do.
One way would be to put something in your rc.local which
runs after things mount ala:
if [ -d /home/weewx/public_html ]
then
# prepopulate things here
mkdir /home/weewx/public_html/forecast
else
logger "error - rc.local could not mkdir for weewx"
fi
You might run into timing issues if you do too much this
way since rc.local tends to run toward the end of the
startup sequence, but a quick mkdir should work.
On Saturday, March 12, 2022 at 12:40:49 PM UTC-8 Eric K
wrote:
Currently running weewx 4.5.1 in a Raspberry Pi 3B+
with the Bullseye version of Raspberry Pi OS.
For a Raspberry Pi (using a microSD card as the OS
system drive) I want to create a ramdisk for
the /home/weewx/public_html directory.
I followed examples from various webpages on the
ramdisk topic.
What I've tried thus far doesn't fully work.
How are others implementing this?
I started by renaming my /home/weewx/public_html
directory to /home/weewx/public_html_backup, so there
would be no conflict when the ramdisk was created at
bootup.
Then, I put this line in the /etc/fstab file and
rebooted.
tmpfs /home/weewx/public_html tmpfs
defaults,noatime,size=100M 0 0
I tested it with sudo mount -a and the new partition
was visible by using the df command.
After a reboot, a /home/weewx/public_html directory
was created as a tmpfs volume.
To test the functionality, I manually ran wee_reports
to force the webpage to be created.
When wee_reports ran, the process crashed with
errors, because some of the files don't exist from
previous runs of wee_reports.
pi@rpi3b:/home/weewx $ sudo bin/wee_reports
Using configuration file /home/weewx/weewx.conf
Generating for all time
Traceback (most recent call last):
File "/home/weewx/bin/user/belchertown.py", line
1390, in get_extension_list
with open(forecast_file, "wb+") as file:
FileNotFoundError: [Errno 2] No such file or
directory: '/home/weewx/public_html/json/forecast.json'
During handling of the above exception, another
exception occurred:
Traceback (most recent call last):
File "/home/weewx/bin/weewx/reportengine.py", line
196, in run
obj.start()
File "/home/weewx/bin/weewx/reportengine.py", line
281, in start
self.run()
File "/home/weewx/bin/weewx/cheetahgenerator.py",
line 152, in run
ngen = self.generate(gen_dict[section_name],
self.gen_ts)
File "/home/weewx/bin/weewx/cheetahgenerator.py",
line 222, in generate
ngen += self.generate(section[subsection], gen_ts)
File "/home/weewx/bin/weewx/cheetahgenerator.py",
line 222, in generate
ngen += self.generate(section[subsection], gen_ts)
File "/home/weewx/bin/weewx/cheetahgenerator.py",
line 310, in generate
searchList = self._getSearchList(encoding, timespan,
File "/home/weewx/bin/weewx/cheetahgenerator.py",
line 387, in _getSearchList
searchList += obj.get_extension_list(timespan,
db_lookup)
File "/home/weewx/bin/user/belchertown.py", line
1399, in get_extension_list
raise Warning(
Warning: Error writing forecast info to
/home/weewx/public_html/json/forecast.json. Reason:
[Errno 2] No such file or directory:
'/home/weewx/public_html/json/forecast.json'
I found that if I copy the contents of my
/home/weewx/public_html_backup folder into the
/home/weewx/public_html ramdisk, then wee_reports
completes and creates the fully populated
/home/weewx/public_html directory.
Is everyone else populating the ramdisk with a backup
of the puclic_html folder at bootup time?
Thanks,
Eric
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