如果出现不能上网，我们的解决步骤如下： mii-tool eth0 //查看物理网线是否已经插好mii-tool eth1ifconfig eth0 //查看网卡信息,ip地址、网管、子网掩码
如果出现不能上网，我们的解决步骤如下：
mii-tool eth0 //查看物理网线是否已经插好mii-tool eth1ifconfig eth0 //查看网卡信息,ip地址、网管、子网掩码是否正常route -n //查看路由信息ping 192.168.30.3 //查看能否ping通网关ping 114.114.114.114 //查看能否ping通外网cat /etc/resolv.conf //发现以上都是正常的，都能够实现。那么就是我们DNS的原因造成的，改了之后就可以了。vim /etc/resolv.conf
CDN网络的用途
优化CSS，JS的时候可以使用公共的cdn如七牛和360云...
智能DNS的实现
修改/etc/named.conf 主配置文件
配置/var/named/chinanet.acl 和/var/named/chinacu.acl 两个文件
用r 命令导入其他文件中ip地址的内容
在每一行的ip地址后面加上；
随机key的生成，追加到主配置文件中
[root@up12 ~]# rndc-confgen -r /dev/urandom |grep -A3 "^key" >>/etc/named.conf
[root@up12 ~]# rndc-confgen -r /dev/urandom |grep -A3 "^key" >>/etc/named.conf
[root@up12 ~]# rndc-confgen -r /dev/urandom |grep -A3 "^key" >>/etc/named.conf
从服务器的配置：
options { listen-on port 53 { any; }; listen-on-v6 port 53 { ::1; }; directory "/var/named"; dump-file "/var/named/data/cache_dump.db"; statistics-file "/var/named/data/named_stats.txt"; memstatistics-file "/var/named/data/named_mem_stats.txt"; allow-query {any; }; recursion yes; dnssec-enable no; dnssec-validation yes; /* Path to ISC DLV key */ bindkeys-file "/etc/named.iscdlv.key"; managed-keys-directory "/var/named/dynamic"; }; logging { channel default_debug { file "data/named.run"; severity dynamic; }; }; #zone "." IN { # type hint; # file "named.ca"; #}; include "/var/named/chinanet.acl"; include "/var/named/chinacu.acl"; view chinanet { match-clients { key chinanet-key; }; server 192.168.30.20{ keys { chinanet-key; }; }; zone "upcdn.com." IN { type slave; file "slaves/upcdn.com.chinanet"; masters{192.168.30.20;}; }; }; view chinacu { match-clients { key chinacu-key; chinacu_acl; }; server 192.168.30.20{ keys { chinacu-key; }; }; zone "upcdn.com." IN { type slave; file "slaves/upcdn.com.chinacu"; masters{192.168.30.20;}; }; }; view other { match-clients { key other-key; any; }; server 192.168.30.20{ keys { other-key; }; }; zone "upcdn.com." IN { type slave; file "slaves/upcdn.com.other"; masters{192.168.30.20;}; }; }; #include "/etc/named.rfc1912.zones"; include "/etc/named.root.key"; key "chinanet-key" { algorithm hmac-md5; secret "QF67mJlx34o6ybCN55TY0g=="; }; key "chinacu-key" { algorithm hmac-md5; secret "f+9oS8sbFufyME8uyVI5SA=="; }; key "other-key" { algorithm hmac-md5; secret "NELFBg4pNaMneCV4e2lB8Q=="; }; 101,1 Bot
