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/

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 (yes in my case); df -i /data/ File system might be corrupted. Fsck fixed it for me (xfs equivalent xfs_repair /dev/mapper/rhel-data

Start using CD, tab at the install menu, add “inst.vnc inst.vncpassword=kluinst” and it will do a vnc install.

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

It is gone, and that is a Good Thing. See my post from 2011: http://karloluiten.nl/deprecated-linux-networking-commands-and-their-replacements/

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 as an empty mail with just a smime.p7s or smime.p7m attachment. This can be fixed on a Linux box: Save the smime.p7m/p7s file Rename to…

$ yum install tnef $ tnef –save-body=body –unix-paths winmail.dat $ oowriter body.rtf

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 us the same, you can use them.

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).

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 cifs-utils ;). Also make sure you do not have special characters in your username and password. CIFS really does not like backslashes. Remove the last…

Use the lowest IP of the range, ergo: # tcpdump net 1.2.3.0/24 # tcpdump net 10.0.0.0/8 not .1 at the and.

use xev

Start recording macro (i normaly use qq) Do commands, end in insert mode Ctrl-o q Macro is now ended and saved in insert mode

$ chronyc sources 210 Number of sources = 4 MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^+ arethusa.tweakers.net 2 10 377 22m -574us[ -574us] +/- 27ms ^* ntp0.mediamatic.nl 2 10 377 22m -946us[-1032us] +/- 32ms ^- dns02.wsrs.net 2 9 377 192 -54ms[ -54ms] +/- 91ms ^+ hosting01.spk.rickes.nl 2 10 377 22m -1834us[-1834us]…

Very short version: echo 1 > /sys/class/scsi_disk/2\:0\:0\:0/device/rescan Resize disk in vmware fdisk /dev/sda2 p, d, 2, n, p, 2 , 258, t, 2, 8e, w reboot/rescan pvresize /dev/sda2 lvextend -l +100%FREE /dev/mapper/VG-lv_data df -h && echo “Be happy” Using parted: resize disk, reboot parted, p (should give larger disk,  remember partition start for lvm part)…

Not documented in the kickstart docs I use: https://fedoraproject.org/wiki/Anaconda/Kickstart , the way to do a minimal (core/nobase) install: %packages –nobase @core @server-policy %end

My nsf shares were mounted as ‘nobody. In /etc/idmap.conf the [Translation] Method= nsswitch, so that is not the problem. Solution is to do “nfsidmap -c” on the box where the share is mounted. And make sure the uid/gid’s are the same (use ldap or something).

Problem: Dec 6 09:09:19 kahuna-karlo systemd-modules-load[8745]: Failed to find module ‘vboxdrv’ Dec 6 09:09:19 kahuna-karlo systemd-modules-load[8745]: Failed to find module ‘vboxnetflt’ Dec 6 09:09:19 kahuna-karlo systemd-modules-load[8745]: Failed to find module ‘vboxnetadp’ Solution: yum install kernel-devel gcc dkms akmod-VirtualBox syslog: Dec 6 09:10:31 kahuna-karlo systemd[1]: Starting Load Kernel Modules… Dec 6 09:10:31 kahuna-karlo kernel: [ 1877.376766]…

I got “Could not allocate requested partitions: requested size exceeds maximum allowed” while installing RHEL on a SAN. Linux seems to be having a max partition size of 2.2TB (2TB). Fix: Stop partitioning, click ‘back’ Go to a text terminal (alt-f2) Find the device you want to put a 2GB+ system on: ls -al /dev/mapper/…

I sometimes need the java control panel. It is not named like the other java programs (java javac javadoc javah javap javaws), that is why I sometimes can’t find it. The java control panel for Linux is called ‘jcontrol’ and can be found in (/usr)/bin/jcontrol. Now you can set java proxy settings in linux and…

I got this on my laptop: Progress state: NS_ERROR_FAILURE VBoxManage: error: Failed to install “/home/klu/tmp/Oracle_VM_VirtualBox_Extension_Pack-4.2.18-88780.vbox-extpack” VBoxManage: error: The installer failed with exit code 127: Error creating textual authentication agent: Error opening current controlling terminal for the process (`/dev/tty’): No such device or address VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ExtPackManager, interface IExtPackManager VBoxManage: error:…

While transferring 200k files to my USB HDD, it stopped and when remounting the disk, I got: Error mounting /dev/sdj1 at /run/media/karlo/WD: Command-line `mount -t “ntfs” -o “uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177” “/dev/sdj1” “/run/media/karlo/WD”‘ exited with non-zero exit status 13: $MFTMirr does not match $MFT (record 0). Failed to mount ‘/dev/sdj1’: Input/output error NTFS is either inconsistent, or there…

Delete package cyrus-sasl-ldap after verifying you don’t need SASL/LDAP on your machine. See https://bugzilla.redhat.com/show_bug.cgi?id=167300 .

$ watch -n 5 grep Dirty /proc/meminfo Gives you the amount of unsync’ed memory every 5 seconds.

pvcp(){ pv “$1” > $2 } Should work. Not yet tested ;).

I got: E558: Terminal entry not found in terminfo ‘screen-256color’ not known. Available builtin terminals are: … This means that the remote host you are working on does not know about the terminal ‘screen-256color’. Fix: local$ infocmp screen-256color > screen-256color.ti local$ scp screen-256color.ti remote: local$ ssh remote remote $ sudo yum install ncurses ncurses-bin #optional…

Simple fix, as root: # hostname -f hostname: Name or service not known # echo “127.0.0.1 `hostname`” >> /etc/hosts # hostname -f karlo-laptop

On support websites I am noticing there is a lot of confusion about system load. This post is my attempt to make a short guide to understanding (and fixing) high Linux system load. Disclaimer: I might be wrong ;). Get your current sysload: $ w 18:54:44 up 22 days, 22:47, 1 user, load average: 2.54,…

Don’t know what a syscall code means in your audit output? Follow these steps to find out: Find the source for your kernel: https://www.kernel.org/pub/linux/kernel/v2.6/ Extract the file Go to /[yourkernelversion]/arch/[your_architecture]/include/asm Open the header file unistd_[32/64].h Find the syscall code Defines: #define __NR_read 0 #define __NR_write 1 #define __NR_open 2 #define __NR_close 3 #define __NR_stat 4…

I was working on a server which did not have ntpq installed, so I couldn’t do ntpq -p. Simple solution is to stop the ntp service and run ntpd -d This will output logging to stdout. Simple solution ;).