I’m having a little trouble getting the Nginx maintenance pages working
as I’d like them to.
I have the following rewrite rule in my Nginx config file:
if (-f /software/shared/system/maintenance.html) {
rewrite ^(.*)$ /system/maintenance.html last;
break;
}
The problem I’m having is that this maintenance page is only showing up
when the Rails application is still running in the background. If I
kill the Rails app I get a 502 Bad Gateway error and checking the Nginx
error log I see that Nginx is asking the mongrels to server the
maintenance file (but they’re not there as the application isn’t
running!)
I’ve copied in my full config below.
Any help would be greatly appreciated!
Arfon
#user nobody;
worker_processes 5;
pid /software/shared/log/nginx.pid;
error_log /software/shared/log/nginx.error.log;
events {
worker_connections 1024;
}
http {
include /software/shared/config/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local]
$request ’
'"$status" $body_bytes_sent “$http_referer” ’
‘"$http_user_agent" “$http_x_forwarded_for”’;
access_log /software/shared/log/nginx.access.log main;
client_body_temp_path /software/shared/nginx/client_temp 1 2;
proxy_temp_path /software/shared/nginx/proxy_temp 1 2;
fastcgi_temp_path /software/shared/nginx/fastcgi_temp 1 2;
sendfile on;
tcp_nopush on;
tcp_nodelay off;
#keepalive_timeout 0;
keepalive_timeout 65;
gzip on;
gzip_http_version 1.0;
gzip_comp_level 2;
gzip_proxied any;
gzip_types text/plain text/html text/css
application/x-javascript text/xml application/xml application/xml+rss
text/javascript;
upstream mongrel {
server myapp.com:6641;
server myapp.com:6642;
server myapp.com:6643;
server myapp.com:6644;
server myapp.com:6645;
}
server {
listen 6640;
client_max_body_size 50M;
root /software/shared/system;
#access_log log/host.access.log main;
rewrite_log on;
if (-f /software/shared/system/maintenance.html) {
rewrite ^(.*)$ /system/maintenance.html last;
break;
}
location / {
# needed to forward user's IP address to rails
proxy_set_header X-Real-IP $remote_addr;
root html;
index index.html index.htm;
# needed for HTTPS
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect false;
proxy_max_temp_file_size 0;
# If the file exists as a static file serve it directly
without
# running all the other rewite tests on it
if (-f $request_filename) {
break;
}
# this is the meat of the rails page caching config
# it adds .html to the end of the url and then checks
# the filesystem for that file. If it exists, then we
# rewite the url to have explicit .html on the end
# and then send it on its way to the next config rule.
# if there is no file on the fs then it sets all the
# necessary headers and proxies to our upstream mongrels
if (-f $request_filename.html) {
rewrite (.*) $1.html break;
}
if (!-f $request_filename) {
proxy_pass http://mongrel;
break;
}
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}