刚安装好Nginx一个常见的问题是无法站外访问，本机wget、telnet都正常。而服务器之外，不管是局域网的其它主机还是互联网的主机都无法访问站点。如果用telnet的话，提示：@H_404_1@
正在连接到192.168.0.xxx...不能打开到主机的连接， 在端口 80: 连接失败@H_404_1@
Connecting to 192.168.0.100:80... Failed: No route to host.@H_404_1@
如果是以上的故障现象，很可能是被CentOS的防火墙把80端口拦住了，尝试执行以下命令，打开80端口：@H_404_1@
iptables -I INPUT -p tcp --dport 80 -j ACCEPT@H_404_1@
然后用：@H_404_1@
/etc/init.d/iptables status@H_404_1@
查看当前的防火墙规则，如果发现有这样一条：@H_404_1@
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80@H_404_1@
就说明防火墙规则已经添加成功了，再在站外访问就正常了。@H_404_1@
2. 编译pcre错误(源码安装Nginx必须先要装pcre)@H_404_1@
libtool: compile: unrecognized option `-DHAVE_CONfig_H'@H_404_1@
libtool: compile: Try `libtool --help' for more @R_61_4045@ion.@H_404_1@
make[1]: *** [pcrecpp.lo] Error 1@H_404_1@
make[1]: Leaving directory `/usr/local/src/pcre-8.21'@H_404_1@
make: *** [all] Error 2@H_404_1@
解决办法：安装g++,别忘了重新configure@H_404_1@
apt-get install g++@H_404_1@
apt-get install build-essential@H_404_1@
make clean@H_404_1@
make@H_404_1@
3. make出错@H_404_1@
make: *** No rule to make target `build',needed by `default'. Stop.@H_404_1@
./configure: error: SSL modules require the OpenSSL library.@H_404_1@
You can either do not enable the modules,or install the OpenSSL library@H_404_1@
into the system,or build the OpenSSL library statically from the source@H_404_1@
with Nginx by using --with-openssl=<path> option.@H_404_1@
apt-get install openssl@H_404_1@
apt-get install libssl-dev@H_404_1@
yum -y install openssl openssl-devel@H_404_1@
4.依赖软件prce,ssl,zlib未安装错误@H_404_1@
1)如果报错@H_404_1@
./configure: error: the HTTP rewrite module requires the PCRE library.@H_404_1@
You can either disable the module by using --without-http_rewrite_module@H_404_1@
option,or install the PCRE library into the system,or build the PCRE library@H_404_1@
statically from the source with Nginx by using --with-pcre=<path> option.@H_404_1@
需要安装pcre包@H_404_1@
Pcre@H_404_1@
tar zxvf pcre-8.12.tar.gz@H_404_1@
cd pcre-8.12@H_404_1@
make@H_404_1@
make install@H_404_1@
2)如果报错@H_404_1@
./configure: error: the HTTP cache module requires md5 functions@H_404_1@
from OpenSSL library. You can either disable the module by using@H_404_1@
--without-http-cache option,or install the OpenSSL library into the system,@H_404_1@
or build the OpenSSL library statically from the source with Nginx by using@H_404_1@
--with-http_ssl_module --with-openssl=<path> options.@H_404_1@
需要安装openssl@H_404_1@
tar zxvf openssl-0.9.8g.tar.gz@H_404_1@
cd openssl-0.9.8g@H_404_1@
./config --prefix=/usr/local/ --openssldir=/usr/local/openssl -g3 shared zlib-dynamic enable-camellia@H_404_1@
make@H_404_1@
make install@H_404_1@
测试是否安装成功：openssl version@H_404_1@
3)如果报错@H_404_1@
configure: error: zlib not found.@H_404_1@
需要安装：gzip.tar.gz@H_404_1@
tar zxvf gzip.tar.gz@H_404_1@
make@H_404_1@
make install@H_404_1@
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