Fourvière (Lyon)

6 September 20206 September 2020 GullRaDriel

Timelapses

6 September 20206 September 2020 GullRaDriel

I decided to group the few timelapses I made these last years.

Can be found here:

https://www.youtube.com/playlist?list=PL-tahIjVksD2SeyoyJsT-c6VVVczH50Ib

#Timelapse #Playlist #Youtube

Testing MAgicLantern RAW videos

6 September 20206 September 2020 GullRaDriel

For informations, current shot is showing the values of continuous recording a timelapse in raw 12 bits mode, using #MagicLantern , crop_mode, and fps override @2.5 fps

The total speed is roughly 179 MB/s

TOTD: Append local file to remote file via SSH

30 July 20209 August 2020 GullRaDriel

Sometimes it’s handy to be able to directly append to a remote file. Here is how to do it simply:

cat my_file | ssh user@host 'dd of=/home/user/outfile oflag=append conv=notrunc'

#TipOfTheDay

Cargo Cult Sytem Administrator

29 July 202029 July 2020 GullRaDriel

And some other types too.

Fun article to read here: https://blog.lastinfirstout.net/2009/11/cargo-cult-system-administration.html

One particularly right: “Asserting that [Technology O] or [Platform L] or [Methodology A] is inherently superior to all others and blindly applying it to all problems. When you make such claims, are you applying science or religion?”

“It’s easy to fall into cargo cult mode.
Just re-boot it, it’ll be fine.” – Michael Janke

Clean cache to reclaim memory without a reboot

29 July 2020 GullRaDriel

Tip submitted by my friend J.K when we were in need of a way to recover reserved cache space without booting.

In root:

PageCache only:

sync ; echo 1 > /proc/sys/vm/drop_caches

Dentries and inodes:

sync ; echo 2 > /proc/sys/vm/drop_caches

PageCache, Dentries and inodes:
(not recommanded in production as it forces a full cache rebuilt. you may still need it):

sync ; echo 3 > /proc/sys/vm/drop_caches

In case you need to do it in a sudo:

echo 3 | sudo tee /proc/sys/vm/drop_caches

Syslog, rsyslogd: change output format to display log level and facilities

29 July 2020 GullRaDriel

If ever you need to sort log messages by their log level yo may need to change the default output format of the syslog.
For rsyslog it’s located in /etc/rsyslogd.conf. Add these lines after the line “$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat” :

$template precise,”%timegenerated% %HOSTNAME% {%syslogpriority%,%syslogfacility%} %syslogtag% %msg%\n”
$ActionFileDefaultTemplate precise

Then restart rsyslogd:
sudo service rsyslog restart

#rsyslogd #syslog #log #loglevel #facilities

X11 / xserver / XWIN gvim problems

28 July 2020 GullRaDriel

Case:

WARNING**: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

Solved by adding NO_AT_BRIDGE=1 before launching gvim ( i.e [user@server]$ NO_AT_BRIDGE=1 gvim myfile.txt) source: https://github.com/NixOS/nixpkgs/issues/16327

Case:

connect /tmp/.X11-unix/X0: Permission denied
E233: cannot open display
Press ENTER or type command to continue

Solved by using correct DISPLAY informations before connecting (DISPLAY=localhost:0.0) source: https://unix.stackexchange.com/a/220234