shamil

Viewing stacktrace of running process using GDB

to view stacktrace of running process, run

sudo gdb -batch -quiet -nx -ex "backtrace full" -p <PID>

to view stacktrace of running process for all threads, run

sudo gdb -batch -quiet -nx -ex "thread apply all backtrace full" -p

shamil

Installing from scratch

Starting from a fresh install of EL6.5, first install EPEL:

# rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm

Then install the Graphite dependencies:

# yum -y install python-whisper python-carbon graphite-web python-memcached python-ldap httpd memcached nodejs npm nc

shamil

###How to send email using mailx through SMTP

Via command line

This is an all-in-one command that sends email to $TO_EMAIL_ADDRESS. You need to also replace these $FROM_EMAIL_ADDRESS and $FRIENDLY_NAME variables with your email and name.

$ mailx -v -s "$EMAIL_SUBJECT" \
    -S smtp=smtp://smtp.domain.tld \
    -S from="$FROM_EMAIL_ADDRESS($FRIENDLY_NAME)" \

$TO_EMAIL_ADDRESS

shamil

# find all listening ports
cat /proc/net/tcp  | awk '$4 == "0A" {print $2}' | awk -F: '{print strtonum("0x"$2)}'

# find all listening ports and print their inodes as well
cat /proc/net/tcp  | awk '$4 == "0A" {print $10" "$2}' | tr : ' ' | awk '{printf "%d %d\n", strtonum("0x"$3), $1}'

# find all socket for PID and print their inodes
find -L /proc/<PID>/fd -type s -printf "%i\n"

# find listening ports for by PID

shamil

This is what I use in Zabbix email action

Subject (problem):

{TRIGGER.SEVERITY}/{HOST.NAME}: {ITEM.NAME}

Subject (recovery):

OK/{HOST.NAME}: {ITEM.NAME}

shamil

def compile_asset?(path)
  # ignores any filename that begins with '_' (e.g. sass partials)
  # all other css/js/sass/image files are processed
  if File.basename(path) =~ /^[^_].*\.\w+$/
    puts "Compiling: #{path}"
    true
  else
    puts "Ignoring: #{path}"
    false
  end

shamil

# Show all grants
mysql --skip-column-names -e "SELECT user, host FROM mysql.user" | sed 's/\t/"@"/g; s/^/SHOW GRANTS FOR "/g; s/$/";/g;' | mysql --skip-column-names

shamil

#System wide associations:

    sudo sed -i 's/gedit.desktop/yournew.desktop/g' /usr/share/applications/defaults.list

# Just your user's associations:

    sed -i 's/gedit.desktop/yournew.desktop/g' ~/.local/share/applications/mimeapps.list

# If you're using the PPA for Sublime Text 2, there is already a .desktop file for it
# sitting in `/usr/share/applications/` so you can just run:

shamil

#!/usr/bin/env ruby1.8

class Workaround
  def initialize target_pid
    @target_pid = target_pid

    first_child
  end

  def first_child

shamil

$ augtool
> set /augeas/load/Spacevars/incl[last()+1] "/etc/redis/redis.conf"
> load
> print /files/etc/redis/redis.conf