X server and nvidia

• To stop the X session
• Hit CTRL+ALT+F1 and login using your credentials.
• kill your current X server session by typing 
• sudo service lightdm stop or sudo stop lightdm
•  If you want to reinstall the nvidia exe
• Enter runlevel 3 by typing 
• sudo init 3 and install your *.run file.
•  You might be required to reboot when the installation finishes. If not, run
• "sudo service lightdm start"  or "sudo start lightdm" to start your X server again.
• If you haven't stop the X server at all, you can come back to the X server environment from the command line environment by doing:
• Hit CTRL+ALT+F7 and login using your credentials.

puppet

• to check if the puppet agent is running:
•   service puppet status
• usually, the service is monitoreed and should not be stopped
• Enable / disable
• [root@p1al25]# puppet agent --disable "Modification blahblah" --verbose
• [root@p1al25]# puppet agent --enable --verbose
• Execute puppet agent
• puppet agent -t  --debug
• used to install the latest version of the package
• check if the agent is enabled or disabled
• [root@p1al25 ~]# service puppet status
• puppet (pid 4387) is running...
• [root@p1al25 ~]# puppet agent --disable "my message" --verbose
• check if it is disabled or not
• [root@p1al25 ~]# cat `puppet agent --configprint agent_disabled_lockfile` 
• {"disabled_message":"reason not specified"}
• I advise to use --verbose, otherwise you don’t get the errors.
• In the case herebelow, I was using puppet with a non root user. This user doesn’t have the privilege to create files in its root.
• bash-4.1$ puppet agent
• bash-4.1$ puppet agent --verbose
• Error: Could not set 'directory' on ensure: Permission denied - /data1/toto/.puppet
• Error: Could not set 'directory' on ensure: Permission denied - /data1/toto/.puppet
• Wrapped exception:
• Permission denied - /data1/leguide/ciao/.puppet
• puppet conf
• puppet config print
• is supposed to print what is in
• less /etc/puppet/puppet.conf
• puppet certificates
• server:
• puppet cert clean lgstagevirt-vm-3s-1.toto.com
• puppet cert list --all |grep vm
• client:
• \rm -r /var/lib/puppet/ssl
• puppet agent -t -d --waitforcert 30
• then server:
• puppet cert sign  lgstagevirt-vm-3s-1.toto.com

Switch from gnome to text mode

On Ubuntu, you can switch to text mode and go to a tty session.

To switch to 1 to 6 tty session, do
CTRL+ALT+1  for example

To go back to the gnome session, do
CTRL+ALT+7

wget

-- doing a post with wget:

wget --post-data="q=(Panasonic)&start=0&rows=1000&wt=json" http://threes1.be.p1.com:8080/solr/offers/for-matching?

store output wget in a file
wget -qO- http://www.cnn.com > toto.txt

CentOS specific

To disable the firewall installed by default on a new CentOS
> service iptables stop

---- change DNS
[root@stage-vm3 ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
/etc/init.d/network restart
vi /etc/resolv.conf

Crontab Survival Kit

# ----- pregen,  */X  means first, first+X, first+2X, etc
55 23 */2 * * cd ~/image/extract-header && bash ./script_pregen.sh
55 23 */3 * * cd ~/image/extract-header && bash ./script_pregen_other_cats.sh

JavaScript / JQuery Survival Kit

• JQuery

$(document).ready(function(){

alert( "ready!" ); });