Installing Varnish cache in cPanel server+Centos5.8
Varnish cache can be configure as a reverse apache proxy for accelarate web site access. Varnish cache stores the web pages in server's virtual memory.
Each users connection will be handled by each worker thread. I have tested this in my testing server. Here we are listrning port 80 to Varnish process and web server will handles the request in port 8080.
# wget http://repo.varnish-cache.org/redhat/varnish-3.0/el5/noarch/varnish-release-3.0-1.noarch.rpm
# rpm --nosignature -i varnish-release-3.0-1.noarch.rpm
# yum install varnish
Open /etc/sysconfig/varnish and make the changes as follows:
NFILES=131072
MEMLOCK=82000
RELOAD_VCL=1
VARNISH_VCL_CONF=/etc/varnish/default.vcl
VARNISH_LISTEN_PORT=80
VARNISH_SECRET_FILE=/etc/varnish/secret
VARNISH_MIN_THREADS=2
VARNISH_MAX_THREADS=1000
VARNISH_THREAD_TIMEOUT=120
VARNISH_STORAGE_FILE=/var/lib/varnish/varnish_storage.bin
VARNISH_STORAGE_SIZE=1G
We need to make sure the following options are updated in this configuration file:
VARNISH_LISTEN_ADDRESS , VARNISH_LISTEN_PORT, VARNISH_VCL_CONF
VARNISH_ADMIN_LISTEN_ADDRESS,VARNISH_ADMIN_LISTEN_PORT
VARNISH_TTL,VARNISH_MIN_THREADS,VARNISH_MAX_THREADS,VARNISH_THREAD_TIMEOUT
VARNISH_SECRET_FILE,VARNISH_STORAGE
Next configuration is at /etc/varnish/default.vcl
backend b1 {
.host = "IP_Address of your server";
.port = "8080";
}
acl a1 {
"IP_Address";
}
sub vcl_recv {
if (server.ip ~ a1) {
set req.backend = b1;
}
}
Next we need to change Apache's port from 80 to 8080
]# /etc/init.d/varnish restart
Stopping Varnish Cache: [ OK ]
Starting Varnish Cache: [ OK ]
]# /etc/init.d/httpd restart
]# netstat -lpn | grep varnish
tcp 0 0 127.0.0.1:6082 0.0.0.0:* LISTEN 18276/varnishd
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 18278/varnishd
tcp 0 0 :::80 :::* LISTEN 18278/varnishd
