我尝试在全新安装的 Debian 9 上安装 lua-resty-auto-ssl

我做了以下

apt update
apt install nginx
apt install build-essential
apt install luarocks
luarocks install lua-resty-auto-ssl
mkdir /etc/resty-auto-ssl
chown www-data /etc/resty-auto-ssl

然后我用在自述https://github.com/GUI/lua-resty-auto-ssl 中发布的最小示例替换了 /etc/nginx/nginx.conf

但是把ngix.conf的内容换成minimal example后，nginx就不能启动了

我得到

root<strong i="13">@vultr</strong>:/etc/nginx# /etc/init.d/nginx start
[....] Starting nginx (via systemctl): nginx.serviceJob for nginx.service failed because the control process exited with error code.
See "systemctl status nginx.service" and "journalctl -xe" for details.
 failed!
root<strong i="14">@vultr</strong>:/etc

root<strong i="17">@vultr</strong>:/etc/nginx# systemctl status nginx.service
● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sat 2019-02-02 20:17:41 UTC; 50s ago
     Docs: man:nginx(8)
  Process: 6606 ExecStop=/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid (code=exited, status=0/SUCCESS)
  Process: 483 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
  Process: 6923 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)
 Main PID: 496 (code=exited, status=0/SUCCESS)

Feb 02 20:17:41 vultr.guest systemd[1]: Starting A high performance web server and a reverse proxy server...
Feb 02 20:17:41 vultr.guest nginx[6923]: nginx: [emerg] unknown directive "lua_shared_dict" in /etc/nginx/nginx.conf:14
Feb 02 20:17:41 vultr.guest nginx[6923]: nginx: configuration file /etc/nginx/nginx.conf test failed
Feb 02 20:17:41 vultr.guest systemd[1]: nginx.service: Control process exited, code=exited status=1
Feb 02 20:17:41 vultr.guest systemd[1]: Failed to start A high performance web server and a reverse proxy server.
Feb 02 20:17:41 vultr.guest systemd[1]: nginx.service: Unit entered failed state.
Feb 02 20:17:41 vultr.guest systemd[1]: nginx.service: Failed with result 'exit-code'.

我的 nginx.conf 的内容

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
  worker_connections 1024;
}

http {
  # The "auto_ssl" shared dict should be defined with enough storage space to
  # hold your certificate data. 1MB of storage holds certificates for
  # approximately 100 separate domains.
  lua_shared_dict auto_ssl 1m;
  # The "auto_ssl_settings" shared dict is used to temporarily store various settings
  # like the secret used by the hook server on port 8999. Do not change or
  # omit it.
  lua_shared_dict auto_ssl_settings 64k;

  # A DNS resolver must be defined for OCSP stapling to function.
  #
  # This example uses Google's DNS server. You may want to use your system's
  # default DNS servers, which can be found in /etc/resolv.conf. If your network
  # is not IPv6 compatible, you may wish to disable IPv6 results by using the
  # "ipv6=off" flag (like "resolver 8.8.8.8 ipv6=off").
  resolver 8.8.8.8;

  # Initial setup tasks.
  init_by_lua_block {
    auto_ssl = (require "resty.auto-ssl").new()

    -- Define a function to determine which SNI domains to automatically handle
    -- and register new certificates for. Defaults to not allowing any domains,
    -- so this must be configured.
    auto_ssl:set("allow_domain", function(domain)
      return true
    end)

    auto_ssl:init()
  }

  init_worker_by_lua_block {
    auto_ssl:init_worker()
  }

  # HTTPS server
  server {
    listen 443 ssl;

    # Dynamic handler for issuing or returning certs for SNI domains.
    ssl_certificate_by_lua_block {
      auto_ssl:ssl_certificate()
    }

    # You must still define a static ssl_certificate file for nginx to start.
    #
    # You may generate a self-signed fallback with:
    #
    # openssl req -new -newkey rsa:2048 -days 3650 -nodes -x509 \
    #   -subj '/CN=sni-support-required-for-valid-ssl' \
    #   -keyout /etc/ssl/resty-auto-ssl-fallback.key \
    #   -out /etc/ssl/resty-auto-ssl-fallback.crt
    ssl_certificate /etc/ssl/resty-auto-ssl-fallback.crt;
    ssl_certificate_key /etc/ssl/resty-auto-ssl-fallback.key;
  }

  # HTTP server
  server {
    listen 80;

    # Endpoint used for performing domain verification with Let's Encrypt.
    location /.well-known/acme-challenge/ {
      content_by_lua_block {
        auto_ssl:challenge_server()
      }
    }
  }

  # Internal server running on port 8999 for handling certificate tasks.
  server {
    listen 127.0.0.1:8999;

    # Increase the body buffer size, to ensure the internal POSTs can always
    # parse the full POST contents into memory.
    client_body_buffer_size 128k;
    client_max_body_size 128k;

    location / {
      content_by_lua_block {
        auto_ssl:hook_server()
      }
    }
  }
}

知道出了什么问题吗？