January 2025 – Mario

Ceph Cruch Map

Posted on 23.01.202507.01.2025 by mario

crunch map

ceph osd crush add-bucket left rack
ceph osd crush add-bucket right rack

ceph osd crush move left root=default
ceph osd crush move right root=default

ceph osd crush move node-1 rack=right
ceph osd crush move node-2 rack=right
ceph osd crush move node-3 rack=right

ceph osd crush move node-4 rack=left
ceph osd crush move node-5 rack=left
ceph osd crush move node-6 rack=left

ceph osd tree

revert changes to default

ceph osd crush move node-1 root=default
ceph osd crush move node-2 root=default
ceph osd crush move node-3 root=default
ceph osd crush move node-4 root=default
ceph osd crush move node-5 root=default
ceph osd crush move node-6 root=default

Git Reset Last Commit

Posted on 23.01.202507.01.2025 by mario

nobody pulled yet

git reset --hard <commit-hash-one-before-the-bad-commit>
git push --force

someone already pulled

git revert <bad-commit-hash>
git push

Git on Windows chmod +x

Posted on 15.01.202507.01.2025 by mario

git update-index --chmod=+x script.sh

Add an alias to git config

git config --global alias.chmod "update-index --chmod"

List All Crontabs

Posted on 12.01.202507.01.2025 by mario

getent passwd | awk -F: '{ print $1 }' | sudo xargs -n1 crontab -l -u | grep -v '^#' | grep -v '^no crontab for'

Journalctl Tricks

Posted on 08.01.202508.01.2025 by mario

journalctl command

vacuum / clean

journalctl --disk-usage
journalctl --vacuum-size=1G

--vacuum-size=BYTES   Reduce disk usage below specified size
--vacuum-files=INT    Leave only the specified number of journal files
--vacuum-time=TIME    Remove journal files older than specified time

read old journal

journcalctl --file /var/log/.../dsdsdsdsdsdsdsds.journal~

goto end of log

sudo journalctl -e

journalctl -e -u certbot.service
journalctl -xeu redis-server.service

list old boots

journalctl --list-boots

Alle Meldungen mit Kennzeichnung error, critical, alert oder emergency anzeigen

journalctl -p err -b

kernel messages only

journalctl -k -e

systemctl list-unit-files

systemctl --failed
# or
systemctl list-units --state=failed

journalctl -xb

Ceph Reset Error

Posted on 07.01.2025 by mario

Display a list of messages:

ceph crash ls

read a message:

ceph crash info <id>

mark message as read

ceph crash archive <id>

or mark all as read

ceph crash archive-all

Vlc Player Starts Very Slow

Posted on 07.01.2025 by mario

FIX

A

Start cmd as Administrator

cd C:\Program Files\VideoLan\VLC
vlc-cache-gen .\plugins

B

Open VLC preferences via the menu or by pressing CTRL+P.
Select show settings > All from the bottom left corner
In the Advanced section, uncheck “Scan for new plugins”

Month: January 2025

Ceph Cruch Map

crunch map

revert changes to default

Git Reset Last Commit

nobody pulled yet

someone already pulled

Git on Windows chmod +x

Add an alias to git config

List All Crontabs

Journalctl Tricks

journalctl command

vacuum / clean

read old journal

goto end of log

list old boots

Alle Meldungen mit Kennzeichnung error, critical, alert oder emergency anzeigen

kernel messages only

Ceph Reset Error

Vlc Player Starts Very Slow

FIX

A

B

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