X-Git-Url: http://git.grml.org/?a=blobdiff_plain;f=grml_tips;h=4fa526361d41e0573e0c2fbaf905600fa4fb113c;hb=4c8e7332cd1a7b92a85de64d90273ad5845821df;hp=f8db64cc0953ca47a1f0539af354a46c79208634;hpb=b218520358b095185ad55d20bf2aa451cc67efa6;p=grml-tips.git

diff --git a/grml_tips b/grml_tips
index f8db64c..4fa5263 100644
--- a/grml_tips
+++ b/grml_tips
@@ -3010,38 +3010,81 @@ Find dangling symlinks using zsh:
 
 % ls **/*(-@)
 -- 
-approx with runit supervision
+Use approx with runit supervision
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+Install the packages:
 # apt-get install approx runit
 
-Add user approxlog for the logging daemon
+Add user approxlog for the logging daemon:
 # adduser --system --home /nonexistent --no-create-home approxlog
 
-Create config directory
+Create config directory:
 # mkdir /etc/sv/approx
 
-Use /var/run/sv.approx as supervise directories
+Use /var/run/sv.approx as supervise directory:
 # ln -s /var/run/sv.approx /etc/sv/approx/supervise
 
-# cat /etc/sv/approx/run
-# #!/bin/sh
+# cat > /etc/sv/approx/run << EOF
+#!/bin/sh
 echo 'approx starting'
 exec approx -f 2>&1
+EOF
 
-You normally do not need a logging service for approx, because it loggs
-to syslog too. So just for completion.
+You normally do not need a logging service for approx because it logs
+to syslog too. So just for completion:
 # mkdir -p /etc/sv/approx/log
 # ln -s /var/run/sv.approx.log /etc/sv/approx/log/supervise
-# cat /etc/sv/approx/log/run
+# cat > /etc/sv/approx/log/run << EOF
 #!/bin/sh
 set -e
 LOG="/var/log/approx"
 test -d "$LOG" || mkdir -p -m2750 "$LOG" && chown approxlog:adm "$LOG"
 exec chpst -uapproxlog svlogd -tt -v "$LOG"
+EOF
 
-Now activate the new approx service (will be started within 5s)
+Now activate the new approx service (will be started within 5s):
 # ln -s /etc/sv/approx/ /var/service/
 
-Make the runit managed approx available with init-script interface.
+Make approx managed via runit available via init-script interface:
 # dpkg-divert --local --rename /etc/init.d/approx
 # ln -s /usr/bin/sv /etc/init.d/approx
+-- 
+Remote-reboot a grml system using SysRQ via /proc (execute as root):
+
+eject &>/dev/null
+umount -l /cdrom
+eject /dev/cdrom
+echo b > /proc/sysrq-trigger
+-- 
+Show what happens on /dev/sda0:
+
+# mount the debugfs to relay kernel info to userspace
+mount -t debugfs none /sys/kernel/debug
+
+# is a convenient wrapper arround blktrace and blkparse
+btrace /dev/sda0
+-- 
+Convert Flash to Avi:
+
+% ffmpeg -i input.flv output.avi
+-- 
+Usage example for cryptsetup / -luks encrypted partition on LVM:
+
+volume group name:   x61
+logical volume name: home
+
+echo "grml-crypt_home /dev/mapper/x61-home none luks" >> /etc/crypttab
+Start cryptdisks
+mount /dev/mapper/grml-crypt_home /mnt/test
+-- 
+fdisk/parted/... complains with something like
+'unable to open /dev/sda - unrecognised disk label'?!
+
+See http://grml.org/faq/#fdisk =>
+
+* use /sbin/fdisk.distrib from util-linux
+* switch to sfdisk, cfdisk,...
+* use parted's mklabel command (but please read the
+  parted manual before executing this command)
+--