源码安装：
    wget http://nginx.org/download/nginx-1.15.8.tar.gz
    tar -zxvf nginx-1.15.8.tar.gz
    cd nginx-1.15.8

    可能需要：
    安装make：yum -y install autoconf automake make
    安装g++: yum -y install gcc gcc-c++
    yum -y install pcre pcre-devel
    yum -y install zlib zlib-devel
    yum install -y openssl openssl-devel

    ./configure —prefix=/usr/local/nginx —with-http_stub_status_module —with-http_ssl_module
    make && make install
    vim /etc/profile
    export PATH=$PATH:/usr/local/nginx/sbin/
    source /etc/profile