The Misadventures of Penoi

Matagal na akong IOS device user. Nagsimula sa Apple Iphone 4 then Iphone5. Although, my first smartphone device was a Sony Ericsson Xperia X10 android phone.

Siguro masyado lang ako na-bored sa user interface ng IOS kaya bumalik ulit ako sa Android. Matagal ko din pinagisipan kung Google Nexus 6 or OnePlus One... Nexus6 have superb up-to-date specs... but price-wise, I got OnePlus One. Since in my opinion(yung may mga budget), max lifespan lang ng isang phone ay 2 years.... magpapalit ka na agad(again, if you have the budget)

>> require 'ipaddr'
>> ip=IPAddr.new("192.168.1.0/24")
=> #<IPAddr: IPv4:192.168.1.0/255.255.255.0>
>> gateway=IPAddr.new(ip.to_range.last.to_i-1,ip.family).to_s
=> "192.168.1.254"
>> ip=IPAddr.new("192.168.1.0/20")
=> #<IPAddr: IPv4:192.168.0.0/255.255.240.0>
>> gateway=IPAddr.new(ip.to_range.last.to_i-1,ip.family).to_s
=> "192.168.15.254"

to get the first ip of the subnet
 >> gateway=IPAddr.new(ip.to_range.first.to_i+1,ip.family).to_s

Post test from mobile

after years of maintaining penoycentral.net, i've decided to end it.

This is my first post using blogger from smartphone. Yeah i've changed my blog hosting from wordpress to blogger after someone hacked my supposedly patched wordpress. Anyway, been contemplating to move to blogger anyway.. Free hosting and bandwidth without thinking of any security stuffs.

Setting up a web kiosk system using raspberrypi+raspbian+ratpoison

This instruction assumes that you already installed raspbian on your SD card

Installing required packages

sudo apt-get update
sudo apt-get ratpoison
sudo apt-get chromium
sudo apt-get x11vnc
sudo apt-get install x11-xserver-utils

=====

Start user pi at startup

pi@raspberrypi:~$ grep pi /etc/inittab 
1:2345:respawn:/bin/login -f pi tty1 

/dev/tty1 2>&1

pi@raspberrypi:~$ cat /home/pi/.bash_profile
if [ -z "$DISPLAY" ] && [ $(tty) == /dev/tty1 ]; then
startx
fi

=====

Set ratpoison's config file

pi@raspberrypi:~$ cat /home/pi/.xinitrc
exec ratpoison

pi@raspberrypi:~$ cat /home/pi/.ratpoisonrc
banish
exec xset s off
exec xset -dpms
exec unclutter -root
exec x11vnc -loop
exec /usr/bin/chromium --kiosk http://www.penoycentral.net

Remotely connec thru vnc

vncviewer raspberrypi.local

# rndc querylog 

Query logs should be logged on /var/log/messages

To turn off

# rndc querylog

ref: http://www.cyberciti.biz/faq/howto-enable-dns-linux-unix-server-logging/

scp file.rar root@192.168.11.60:/var/tmp/
root@192.168.11.60's password:
bash: scp: command not found
lost connection

 

i forgot that i have done a minimal server install on the receiving end. installing openssh-clients solve the problem

To insert characters on the beginning of a line. Example, insert // from line 1 to 10

 :1,10s!^!//! 

Sample in creating folding in vim. Insert #{{{ text here #}}} provided everything was properly setup on vimrc

~/workspace/puppetworks $ cat site.pp
node 'chrisp.lab.local' {#{{{




}#}}}

pressing zc will close the folded texts

+--  6 lines: node 'chrisp.lab.local' {#----------------------------------------------------------------------------

ref: http://www.linux.com/learn/tutorials/442438-vim-tips-folding-fun

Under /etc/rsyslog.conf append

$FileCreateMode 0655
$DirCreateMode 0755
$Umask 0022

$template default,"/srv/logs/%HOSTNAME%/%$now%.log"
*.* ?default

this will create directories under /srv/logs//*.logs with Directory permission of 755 and file permission of 655

Vmware apologizes for technical difficulties on the recent webcast Technology Day Online. It looks like the webcast provider was caught off guard on the situation. To compensate, VMware will be sending me a USB memory stick containing all of the materials presented on the said event.

Well.. apology accepted!!!!! :)

Our Samsung LCD TV retired after exactly 3 yrs of service. Bad thing is that it is already out of warranty. Yesterday the screen suddenly turns to white that you can barely see the images.

Find and replace string recursively

find /home/penoycentral/whichfolder -type f -print0| xargs -0 sed -i 's/oldstring/newstring/g'

If you want to make sure that you are changing which, use the old grep first

find /home/penoycentral/whichfolder -type f -print0| xargs -0 grep -i oldstring

Example Problem: Change /etc/bind to /var/named/master in named.conf

Just print what will be changed

 sed -n 's/\/etc\/bind/\/var\/named\/master/p' named.conf 

to change:

 sed -i 's/\/etc\/bind/\/var\/named\/masterr/g' named.conf 

Change double qoute to single qoute

sed -i "s/[\"]/\'/g" some-file.pp

Referrence:
http://stackoverflow.com/questions/1583219/awk-sed-how-to-do-a-recursive-find-replace-of-a-string

DNS change progation is one of sysads problem. After a dns record change, nslookup result will differ depending on which region you are in.

Check your DNS global progation

 http://www.whatsmydns.net/

Note this setup is unsecured and just for the purpose of having my own lab svn repo.

Install mercurial on your server

yum install mercurial

Setup the mercurial site on apache

mkdir /var/www/cgi-hg
cp /usr/share/doc/mercurial-1.4/hgwebdir.cgi /var/www/cgi-hg/
chmod +x /var/www/cgi-hg/hgwebdir.cgi

Create the hgweb.config

 /var/www/cgi-hg/hgweb.config
[paths]
#VIRTUAL_PATH = /REAL/PATH
#myproject = myproject
lab = /srv/hg

Reload apache

service httpd reload

Make sure everything has the right permission on selinux or you can temporarily disable selinux

Your site now is accessible thru http://servername/hg

To test push functionality,you might try to disable ssl and allow push to all

/srv/hg/.hg/hgrc

[web]
allow_push = *
push_ssl = false

Ref:
http://mercurial.selenic.com/wiki/RHEL4HgWebDirSetup
http://mercurial.selenic.com/wiki/PublishingRepositories

Devops Singapore Meetup Puppet in production session

eth0 - with internet connection as they say
eth2 - local network

echo 1 > /proc/sys/net/ipv4/ip_forward 
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A FORWARD -i eth2 -j ACCEPT

penoy@fedora:~$ mail -s "test sending mail from nix server" penoy@example.com < /dev/null

sysctl net.ipv4.ip_forward=1
iptables -t nat -A PREROUTING -p tcp --dport 3129 -j DNAT --to-destination ip-address:3128
iptables -t nat -A POSTROUTING -j MASQUERADE
iptables -L
iptables -t nat -L -n -v
iptables-save

Here's an example of a simple manifest file that will install a package (ex. apache) and will ensure that that the service was started after install

package {'httpd':
   ensure => installed,
    source => '/var/tmp/httpd-2.2.3-53.el5.centos.i386.rpm',
}

service {'httpd':
   ensure     => running,
   enable     => true,
   hasstatus  => true,
   hasrestart => true,
}

Seems legit. Let's apply the manifest

[root@learn tmp]# puppet apply httpd.install.pp
err: /Stage[main]//Service[httpd]/ensure: change from stopped to running failed: Could not start Service[httpd]: Execution of '/sbin/service httpd start' returned 1:  at /var/tmp/httpd.install.pp:11
notice: /Stage[main]//Package[httpd]/ensure: created
notice: Finished catalog run in 31.04 seconds

hmmm.. it seems that puppet was starting the service before the install. Let's modify the file

package { 'httpd':
ensure => installed,
source => '/var/tmp/httpd-2.2.3-53.el5.centos.i386.rpm',
}

service { 'httpd':
require => Package['httpd'],
ensure => running,
enable => true,
hasstatus => true,
hasrestart => true,
}

Now let's apply the new manifest file

[root@learn tmp]# puppet apply httpd.install.pp
notice: /Stage[main]//Package[httpd]/ensure: created
notice: /Stage[main]//Service[httpd]/ensure: ensure changed 'stopped' to 'running'
notice: Finished catalog run in 34.10 seconds

[root@learn tmp]# chkconfig --list |grep httpd
httpd           0:off   1:off   2:on    3:on    4:on    5:on    6:off
pe-httpd        0:off   1:off   2:on    3:on    4:on    5:on    6:off

[root@learn tmp]# rpm -qa |grep httpd
pe-httpd-2.2.3-17.pe.el5
pe-httpd-passenger-2.2.11-11.pe.el5
httpd-2.2.3-63.el5.centos.1
[root@learn tmp]# service httpd status
httpd (pid  15355) is running...

Disclaimer: im still a puppetlabs newbie. :)