In Linux, cache DNS resolution is used to increase the speed of online response.

In Linux, cache DNS resolution is used to speed up the response to the Internet-Linux Enterprise Application-Linux server application information. The following is a detailed description. When you use Firefox to browse a webpage, you will always see a prompt in the lower left corner at the beginning:

"Parsing host xxx ..."

It seems that the DNS server is waiting for domain name resolution, so it is idle and decides to make a DNS Cache to increase the speed!

I found one:

[Xport @ ubuntu ~] $ Apt-cache search "dns" | fgrep "cach"
Dnsmasq-A small caching DNS proxy and DHCP server

Follow these steps:

1. Install dnsmasq:

# Install the dnsmasq Software Package
[Xport @ ubuntu ~] $ Sudo apt-get install "dnsmasq"

2. Set dnsmasq to take over the local DNS resolution request:

# Modify the configuration file of dnsmasq
[Xport @ ubuntu ~] $ Sudo gedit/etc/dnsmasq. conf

# Find the following content and modify it
# If you want dnsmasq to listen for DHCP and DNS requests only on
# Specified interfaces (and the loopback) give the name of
# Interface (eg eth0) here.
# Repeat the line for more than one interface.
# Interface =
# Or you can specify which interface _ not _ to listen on
# Define T-interface =
# Or which to listen on by address (remember to include 127.0.0.1 if
# You use this .)
Listen-address = 127.0.0.1 # Remove the comment above this line


3. Modify the dhclient Configuration:

# Modify the configuration file of dnsmasq
[Xport @ ubuntu ~] $ Sudo gedit/etc/dhcp3/dhclient. conf

# Find the following content and modify it
Prepend domain-name-servers 127.0.0.1; # Remove the comment above this line
Request subnet-mask, broadcast-address, time-offset, routers,
Domain-name, domain-name-servers, host-name,
Netbios-name-servers, netbios-scope;


4. Modify the resolv. conf configuration:

[Xport @ ubuntu ~] $ Sudo gedit/etc/resolv. conf

# Because dnsmasq takes over the DNS resolution request of the local machine, the address of 127.0.0.1 is placed at the beginning.
Nameserver 127.0.0.1
Nameserver xxx. xxx
Nameserver xxx. xxx
Search localdomain


5. Restart the dnsmasq service:

[Xport @ ubuntu ~] $ Sudo/etc/init. d/dnsmasq restart