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How To Set Up SSH Keys on Debian/Ubuntu
ssh-keygen -t rsa
You will be prompted for a location to save the keys, and a passphrase for the keys. This passphrase will protect your private key while it’s stored on the hard drive and be required to use the keys every time you need to login to a key-based system:
Generating public/private rsa key pair.
Enter file in which to save the key (/home/b/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/b/.ssh/id_rsa.
Your public key has been saved in /home/b/.ssh/id_rsa.pub.
cp id_rsa.pub authorized_keys
chmod 700 ~/.ssh
chmod 600 authorized_keys
Then edit your /etc/ssh/sshd_config to:
AuthorizedKeysFile /etc/ssh/%u/authorized_keys
Finally, restart ssh with:
service ssh restart
On the host computer, ensure that the /etc/ssh/sshd_config contains the following lines, and that they are uncommented;
PubkeyAuthentication yes
RSAAuthentication yes
if disable the PasswordAuthentication,change
PasswordAuthentication yes
to
PasswordAuthentication no
How To Install and Configure Varnish 3 with Apache on Debian
About Varnish
Varnish is an HTTP accelerator designed for content-heavy dynamic web sites as well as heavily consumed APIs. In contrast to other web accelerators, such as Squid, which began life as a client-side cache, or Apache and nginx, which are primarily origin servers, Varnish was designed as an HTTP accelerator. Varnish is focused exclusively on HTTP, unlike other proxy servers that often support FTP, SMTP and other network protocols.
Setup
Apache and Varnish
apt-get install apache2
Step One—Install Varnish
The varnish site recommends installing the varnish package through their repository.
You can start that process by grabbing the repository:
curl http://repo.varnish-cache.org/debian/GPG-key.txt | sudo apt-key add -
The next step is to add the repository to the list of apt sources. Go ahead and open up that file.
vim /etc/apt/sources.list
Once inside the file, add the varnish repository to the list of sources.
deb http://repo.varnish-cache.org/ubuntu/ lucid varnish-3.0
Save and exit.
Finally, update apt-get and install varnish.
apt-get update
apt-get install varnish
Step Two—Configure Varnish
Varnish will serve the content on port 80, while fetching it from apache which will run on port 8080.
vim /etc/default/varnish
DAEMON_OPTS="-a :80 \
-T localhost:6082 \
-f /etc/varnish/default.vcl \
-S /etc/varnish/secret \
-s malloc,256m"
Once you save and exit out of that file, open up the default.vcl file:
vim /etc/varnish/default.vcl
The configuration should like this:
backend default
.host = "127.0.0.1";
.port = "8080";
if enbale esi
sub vcl_fetch
set beresp.do_esi = true; /* Do ESI processing */
set beresp.ttl = 24 h; /* Sets the TTL on the HTML above */
Step Three—Configure Apache
vim /etc/apache2/ports.conf
Change the port number for both the NameVirtualHost and the Listen line to port 8080, and the virtual host should only be accessible from the localhost. The configuration should look like this:
NameVirtualHost 127.0.0.1:8080
Listen 127.0.0.1:8080
Change these settings in the default virtual host
vim /etc/apache2/sites-available/default
<VirtualHost 127.0.0.1:8080>
Save and exit the file and proceed to restart Apache and Varnish.
service apache2 restart
service varnish restart
or manual start varnish
varnishd -f /etc/varnish/default.vcl -s malloc,128M -T 127.0.0.1:2000 -a 0.0.0.0:999 -d
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How to uninstall gnome environment on debian
aptitude purge liborbit2
Grails Service, Get session,response,request,servletContext
import org.codehaus.groovy.grails.web.util.WebUtils
import org.springframework.web.context.request.RequestContextHolder
……
//Getting the Request object
def getRequest()
def webUtils = WebUtils.retrieveGrailsWebRequest()
webUtils.getCurrentRequest()
//Getting the Response object
def getResponse()
def webUtils = WebUtils.retrieveGrailsWebRequest()
webUtils.getCurrentResponse()
//Getting the ServletContext object
def getServletContext()
def webUtils = WebUtils.retrieveGrailsWebRequest()
webUtils.getServletContext()
//Getting the Session object
def getSession()
RequestContextHolder.currentRequestAttributes().getSession()
Getting Spring Context in Grails BootStrap
import org.springframework.web.context.support.WebApplicationContextUtils
class BootStrap
def init = servletContext ->
// Get spring
def springContext = WebApplicationContextUtils.getWebApplicationContext( servletContext )
