方法1：yum安装
wget https://openresty.org/package/centos/openresty.repo -O /etc/yum.repos.d/openresty.repo
yum install pcre-devel openssl-devel gcc #开发库依赖
yum check-update # 更新yum数据
yum install -y openresty
yum install -y openresty-resty #安装命令行工具 resty
yum install -y openresty-opm #命令行工具 opm
方法2：编译安装
wget https://openresty.org/download/openresty-1.21.4.1.tar.gz # 下载
tar xzvf openresty-1.21.4.1 # 解压
cd openresty-1.21.4.1
./configure
make
make install
启动：/usr/local/openresty/nginx/sbin/nginx -c conf/nginx.conf
