When developing multiple services that depends on other service, it’s comfortable to have a dev
environment. I usually have a docker-compose file that mount a local environment. However, I do
not want to mount the whole ecosystem locally, just the services I’m currently developing.
By using Nginx, it’s possible to configure a fallback in case the local service is not up.
Here an example of the nginx.conf file that redirect HTTP to HTTPS and fallback to a dev
environment service if my local service is not up:
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user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
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 /var/log/nginx/access.log main;
sendfile on;
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name localhost;
# redirect HTTP to HTTPS
return 301 https://$host$request_uri;
}
server {
listen 443 ssl;
server_name localhost;
ssl_certificate /etc/nginx/certificates/localhost.crt;
ssl_certificate_key /etc/nginx/certificates/localhost.key;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers HIGH:!aNULL:!MD5;
proxy_set_header Host $host;
proxy_set_header X-Real-Ip $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-Proto $scheme;
location / {
root /usr/share/nginx/html;
index index.html index.htm;
}
location /foobar {
# Reverse proxy to local service
proxy_pass http://localhost:8080;
# if local service is not up, then use the one from the dev environment
proxy_intercept_errors on;
error_page 404 502 503 504 = @fallback;
}
location @fallback {
# dev environment hostname
proxy_set_header Host fallback.dev;
proxy_pass https://fallback.dev;
}
}
}
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Sources:
