Network interface renaming (virtual) after mac change
karlo (Note to self) /etc/udev/rules.d/70*
Samsung-Linux HDMI fix overscan (missing 5% borders)
This is very annoying, and undocumented. Basically, you do not have to change anything on the linux side. It is just the TV that needs to know you are connecting…
[Fix] Disable RHEL7 tmux auto pane renaming in tmux
In .tmux.conf: set -g automatic-rename off set -g allow-rename off
Split files to loop devices
FILE=file_name; CHUNK=$((64*1024*1024)); SIZE=$(stat -c "%s" $FILE); for ((i=0; i < $SIZE; i+=$CHUNK)); do losetup --find --show --offset=$i --sizelimit=$CHUNK $FILE; done via http://www.commandlinefu.com/commands/view/13735/split-a-large-file-without-wasting-disk-space
Improve usb write speeds on linux (fat)
mount -o flush /dev/sdf1 /mnt
Kobo on Linux, skip installation
Activate: Find the hidden .kobo dir after attaching the kobo to your pc/laptop Install sqlite3 sqlite3 KoboReader.sqlite INSERT INTO “user” VALUES(‘aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa’,’aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa’,’xxxx@xxxx.xx’,’xxxx@xxxx.xx’,’2aaaa aaaaaaaaaaaaa==’,NULL,NULL); sqlite> .exit Add dictionaries: http://www.mobileread.com/forums/showthread.php?t=196931
Fun telnet
telnet towel.blinkenlights.nl
Fun traceroute/tracert
traceroute -m 255 obiwan.scrye.net
Nagios, nrpe and selinux policies (audit)
Selinux seems to “dontaudit” logs by default. This means that when selinux is permissive, your plugins will work, and when you setenforce 1 your server, plugins fail. This all happens…
Bash percentage calculate snippet
MEMLINE=$( tac $MGRBASE/$REL_LOGLOC/server.status.log | egrep -m1 '\*\*.*Memory Status:' ) USED=$( echo "$MEMLINE" | egrep -o '+ MB Used' | sed 's/\..*//;s/,//' ) MAX=$( echo "$MEMLINE" | egrep -o '+ MB…
Bash file age check snippet
if ]; then #Check age if ]; then echo "Backup takes too long" else echo "Doing backup" fi fi
TCPdump capture dhcp traffic
WIP sudo tcpdump -i any -nnvvv -s 1500 '(port 67 or port 68)'
Changing default browser in Fedora
Open gnome-control-center, go to system, details, default applications
Systemctl for nfs: Failed to issue method call: No such file or directory
systemctl enable nfs Failed to issue method call: No such file or directory Solution: use nfs-server .
Generate crypted salted password (for kickstart / shadow file)
python -c 'import crypt; print(crypt.crypt("Karlo", "$6$SaltHere"))' If your output ends with a dot, copy that as well.
Fix Timeout in locking authority file */.Xauthority
When logging in (via SSH) to one of my systems, it said: timeout in locking authority file */.Xauthority When this happens: Make sure the users’ home dir is readable +…
Sestatus selinux config not read on RHEL/CentOS
If you want to change the selinux config, be aware that there are two files: /etc/selinux/config /etc/sysconfig/selinux The second one should be a symlink to the first one but I…
Disable lid suspeld linux (no gnome)
edit /etc/systemd/logind.conf set HandleLidSwitch=ignore via http://revryl.com/2013/05/16/how-to-disable-auto-suspend-when-laptop-lid-is-closed-in-fedora-1817/
No space left on device on Rhel, Centos, Linux – though space is free
I got the error “No space left on device” when doing mkdir. Steps to fix: Is there still space (yes in my case); df -h /data/ Are there still inodes…
Install RHEL7 using VNC
Start using CD, tab at the install menu, add “inst.vnc inst.vncpassword=kluinst” and it will do a vnc install.
Fix requested NFS version or transport protocol is not supported
I got this on RHEL 6: requested NFS version or transport protocol is not supported Restarting the NFS daemon fixed this. Guess some libraries were updated. Haven’t taken the time…
YouCompleteMe for Vim required dependencies
For https://valloric.github.io/YouCompleteMe/ you will need (on Fedora) to: cd .vim/bundle git clone https://github.com/Valloric/YouCompleteMe cd YouCompleteMe git submodule update –init –recursive sudo yum install cmake gcc-c++ python-libs python-devel ./install.sh
Set hostname RHEL7
Setting hostname via /etc/sysconfig/network does not seem to work anymore. Instead use hostnamectl set-hostname hostname.domain.
RHEL7 ifconfig gone! halp!
It is gone, and that is a Good Thing. See my post from 2011: http://karloluiten.nl/deprecated-linux-networking-commands-and-their-replacements/
[Fix] Gmail smime.p7m and tnef open mail (with winmail.dat)
Outlook and gmail do not always work together. If a someone sends you a mail from outlook using Rich Text, and has s/mime enabled, the mail will show in gmail…
[Fix] Open a winmail.dat file (TNEF)
$ yum install tnef $ tnef --save-body=body --unix-paths winmail.dat $ oowriter body.rtf
Check modulus of ssl key and certificate to see if they match
Use these commands to see if a private key matches a server’s certificate: # openssl rsa -noout -modulus -in server.key # openssl x509 -noout -modulus -in server.crt If the modulus…
Validating kickstart files (ks) for Fedora/Rhel
If you want to validate your kickstart files, install pykickstart. It comes with /usr/bin/ksvalidator which gives info on what is wrong with your kickstart files (syntax et cetera).
[Fix] Cifs block device is write protected, mounting read-only
If you only have samba libs, and not cifs-utils installed, you will get: mount: block device //10.0.64.60/linux is write-protected, mounting read-only mount: cannot mount block device //10.0.64.60/linux read-only So install…