nginx 'invalid number of arguments in "map" di

Question

我正试图反向代理一个websocket，这是我以前用nginx做过的，没有问题。奇怪的是，我似乎不能用这么简单的东西来重现我之前的成功。我已经一遍又一遍地查看配置文件，但似乎找不到我的错误。

这是我的完整default.conf:

map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}
server {
  listen 80;
  location /api/ {
    proxy_pass ${API_LOCATION};
  }
  location / {
    proxy_pass ${UI_LOCATION};
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
  }
}

我得到的错误:

2016/10/10 23:30:24 [emerg] 8#8: invalid number of arguments in "map" directive in /etc/nginx/conf.d/default.conf:1
nginx: [emerg] invalid number of arguments in "map" directive in /etc/nginx/conf.d/default.conf:1

和确切的Dockerfile，我正在使用，如果你想复制我的设置(保存default.conf作为conf.templates/default.conf相对于Dockerfile:

FROM nginx
COPY conf /etc/nginx/conf.templates
CMD /bin/bash -c "envsubst < /etc/nginx/conf.templates/default.conf > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;'"

Answer 1

envsubst命令替换所有出现的$vars，包括$http_upgrade和$connection_upgrade。您应该提供要替换的变量列表，例如:

 envsubst '${API_LOCATION},${UI_LOCATION}' < /etc/nginx/conf.templates/default.conf

参见:用envsubst

替换特定变量

此外，在Dockerfile配置中，您应该使用双$$转义来禁用变量替换:

FROM nginx
COPY conf /etc/nginx/conf.templates
CMD /bin/bash -c "envsubst '$${API_LOCATION},$${UI_LOCATION}' < /etc/nginx/conf.templates/default.conf > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;'"