服务器使用的hosts文件可以从老D的论坛上获得，地址：http://laod.cn/tag/google-hosts
修改服务器hosts文件后，需要使其生效，但是提示如下
点击(此处)折叠或打开

[root@Primary etc]# sudo rcnscd restart
sudo: rcnscd: command not found

解决的方法是：安装nscd服务重启服务后可以访问google HK

点击(此处)折叠或打开

[root@Primary etc]# yum -y install nscd
[root@Primary etc]# man nscd
NSCD(8) Linux Programmer’s Manual NSCD(8)

NAME
/usr/sbin/nscd - name service cache daemon

DESCRIPTION
Nscd is a daemon that provides a cache for the most common name service requests. The default configuration file, /etc/nscd.conf, determines the behavior of the cache daemon. See nscd.conf(5).

Nscd provides caching for accesses of the passwd(5), group(5), and hosts(5) databases through standard libc interfaces, such as getpwnam(3), getpwuid(3), getgrnam(3), getgrgid(3), gethostbyname(3), and
others.

There are two caches for each database: a positive one for items found, and a negative one for items not found. Each cache has a separate TTL (time-to-live) period for its data. Note that the shadow file
is specifically not cached. getspnam(3) calls remain uncached as a result. As a result of this behavior it is not possible to change non-nscd user to another non-nscd user via su service when nscd is
running.

OPTIONS
--help will give you a list with all options and what they do.

NOTES
The daemon will try to watch for changes in configuration files appropriate for each database (e.g. /etc/passwd for the passwd database or /etc/hosts and /etc/resolv.conf for the hosts database), and
flush the cache when these are changed. However, this will happen only after a short delay (unless the inotify(7) mechanism is available and glibc 2.9 or later is available), and this auto-detection does
not cover configuration files required by non-standard NSS modules, if any are specified in /etc/nsswitch.conf. In that case, you need to run the following command after changing the configuration file of
the database so that nscd invalidates its cache:

$ nscd -i <database>

SEE ALSO
nscd.conf(5), nsswitch.conf(5)

COLOPHON
This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.

GNU 2008-12-05 NSCD(8)
[root@Primary etc]#
[root@Primary etc]# service nscd restart
Stopping nscd: [FAILED]
Starting nscd: [ OK ]
[root@Primary etc]# ping
PING (220.255.2.153) 56(84) bytes of data.
64 bytes from chatenabled.mail.google.com (220.255.2.153): icmp_seq=1 ttl=45 time=336 ms
64 bytes from chatenabled.mail.google.com (220.255.2.153): icmp_seq=2 ttl=45 time=334 ms
64 bytes from chatenabled.mail.google.com (220.255.2.153): icmp_seq=3 ttl=45 time=339 ms
^C
--- ping statistics ---
4 packets transmitted, 3 received, 25% packet loss, time 3114ms
rtt min/avg/max/mdev = 334.770/337.134/339.744/2.092 ms
[root@Primary etc]#

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