[Linux] How to reinstall shutdown / reboot

First of all, check where they are :

which shutdown 
/sbin/shutdown

which reboot
/sbin/reboot

After, check the package :

$ dpkg -S /sbin/shutdown
upstart: /sbin/shutdown

$ dpkg -S /sbin/reboot
upstart: /sbin/reboot




Now we can reinstall :

sudo apt-get install --reinstall upstart

Source : http://askubuntu.com/questions/631929/reboot-and-shutdown-executables-missing

[Apache2] Too many processes

If you have a lot of instances of apache2, you can update the values for StartServers, MinSpareServers and MaxSpareServers:

<IfModule mpm_prefork_module> 
StartServers 5 #at the begining
MinSpareServers 5  #min servers spare
MaxSpareServers 10  #max servers spare
MaxClients 150 
MaxRequestsPerChild 0 
</IfModule>

Source : https://fuscata.com/kb/set-maxclients-apache-prefork

[LinkedIn] Build resume from profile

You can use the Linkedin CV chrome extension to generate a resume in PDF.

How to use
- Install the Linkedin CV extension.
- Go to your Linkedin profile and click the "View profile as" button. Because it will convert your complete profile not the editable one.
- Click the Linkedin logo in your browser address bar. Then your Linkedin profile will be converted.
- Press (Ctrl + P) to activate the print options in Google Chrome.
- From the options column on the left choose "Save as PDF" for destination.
- Click "Save" to save your CV.

[MongoDB] Please ensure LANG and/or LC_* environment variables are set correctly.

When I run:

mongo

Error message:

Failed global initialization: BadValue Invalid or no user locale set. Please ensure LANG and/or LC_* environment variables are set correctly.

Solution:

export LC_ALL=C