Opened 3 years ago

Last modified 3 years ago

#2458 closed defect

Unexpected intermittent behavior of map directive(s) — at Initial Version

Reported by: me.niklasbeierl.io@… Owned by:
Priority: minor Milestone:
Component: nginx-module Version: 1.23.x
Keywords: map ssl_server_name alias Cc:
uname -a: Linux 0e0657b7cd93 5.10.0-19-amd64 #1 SMP Debian 5.10.149-2 (2022-10-21) x86_64 Linux
nginx -V: nginx version: nginx/1.23.3
built by gcc 12.2.1 20220924 (Alpine 12.2.1_git20220924-r4)
built with OpenSSL 3.0.7 1 Nov 2022
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --with-perl_modules_path=/usr/lib/perl5/vendor_perl --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-Os -fomit-frame-pointer -g' --with-ld-opt=-Wl,--as-needed,-O1,--sort-common

Description

I have a single Https server configured, it uses one certificate for all the domains.

What I want it to do is this:

app.com/static/* -> Serve from filesystem
app.com -> Proxy to app server
staging.app.com/static/* -> Serve from filesystem (different folder)
staging.app.com -> Proxy to staging app server

Config:

# Use docker DNS to resolve other services
resolver 127.0.0.11 valid=30s;

# Choose upstream based on server name
map $ssl_server_name $targetBackend {
    # volatile; # doesnt fix it
    myapp.com http://production:81/; 
    staging.myapp.com http://staging:81/;
}

# Choose static dir based on ssl server
map $ssl_server_name $staticPath {
    # volatile; # doesnt fix it
    myapp.com /var/www/staging-static/;
    staging.myapp.com /var/www/production-static/;
}

server {
     listen 443 ssl http2;
     listen [::]:443 ssl http2;

     server_name myapp.com;
     server_name staging.myapp.com;

     ssl_certificate /etc/letsencrypt/live/x/cert.pem;
     ssl_certificate_key /etc/letsencrypt/live/x/privkey.pem;
     ssl_session_timeout 1d;
     ssl_session_cache shared:MozSSL:10m;  # about 40000 sessions
     ssl_session_tickets off;

     ssl_dhparam /etc/nginx/conf.d/dhparam;
     ssl_protocols TLSv1.2 TLSv1.3;
     ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
     ssl_prefer_server_ciphers off;


    # If path is sub-path of /static, serve from some dir
    location /static/ {
        alias $staticPath;
    }
   
    # Forward everything else to app servers
    location / {
        proxy_pass $targetBackend;
    }
}

In my test setup, I have the upstream servers send a retrun page that identifies them: "Hello, I am X". And the two static folders also have a simple index.html identifying them.

It only sometimes behaves as expected. Some weirdness I often get are those:

Open staging.app.com/static/ -> Get staging static
Open app.com/static/ -> Get staging static again ??

Or:

Open staging.app.com/static/ -> Get staging static
Open app.com/static/ -> Get production static
Open app.com/static/ -> Get staging static ???

I have tried adding volatile to the maps but it did not fix the issue.

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