What does the NGINX proxy_pass config do? Let's say for example I have a Django app that is hosted up on Amazon's EC2 services.
On EC2, let's say I have 1 load balancer in front of 2 nginx servers. The nginx servers point to the 4 django app servers that use Gunicorn as there WSGI server:
upstream my-upstream {
server 12.34.45.65:8000;
server 13.43.54.56:8000;
server 13.46.56.52:8000;
server 14.46.58.51:8000;
}
location / {
proxy_pass http://my-upstream;
}
What is the proxy_pass? would it be the URL of the load balancer in this case?
Take a look at nginx's HttpProxyModule, which is where proxy_pass comes from. The proxy_pass docs say:
This directive sets the address of the proxied server and the URI to
which location will be mapped.
So when you tell Nginx to proxy_pass, you're saying "Pass this request on to this proxy URL".
There's also documentation on upstream available:
This directive describes a set of servers, which can be used in
directives proxy_pass and fastcgi_pass as a single entity.
So the reason that you use upstream for proxy_pass is because proxy_pass is expecting one URL, but you want to pass it more than one (so you use an upstream).
If your load balancer is in front of your nginx, your load balancer URL won't be in this config.
It should be:
proxy_pass http://my-upstream;
nginx will load-balance all requests over your 4 djano+gunicorn instances (your my-upstream). The load-balancers will point to the nginx servers.
Related
On my aws ubuntu (18.04) machine, I have 2 applications running on 2 ports
(1) I have a .net core 3.1 angular spa with identity server 4 running on 5000 and I set it up using the steps below
The nginx is a reverse proxy only
(2) I have an angular ssr application running on port 4000.
What I want to achieve is for the reverse proxy to proxy social media bots to port 4000 while all other requests are proxied to the 5000.
Currently nginx is only proxying to the .net core app on port 5000
You can use "location and proxy_pass" to access your desire applications which are working on different ports.
If you have all stuffs on a same vm just use localhost insted of ip address i wrote it down.
But if application are running on another vm use its IP address which in my configuration the destination server is : 172.16.0.100
You can edit the hosts file and use "example.com" or whatever to point your site and use in your nginx configuration file instead of IP or localhost.
sudo vi /etc/hosts
172.16.0.100 example.com
and add your desire FQDN to the destination host or if you have a dns, add an AAAA record which would be available in whole local network.
I write this configuration in my nginx server and it works like a charm.
Anyway you can write and edit this configuration base on your environment.
server {
{
listen 80;
server_name 172.16.0.100;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
location /angular {
proxy_pass http://172.16.0.100:5000;
}
location /ssr {
proxy_pass http://172.16.0.100:4000;
}
}
I have Django rest API application and swagger for that is working fine locally. I am trying to configure it using containers and deploy it on ECS.
Now when I build and run the container the application works fine (I mean the swagger UI is appearing). When I attach the application load balancer to it, on the browser it is giving me 404 files not found for js and CSS files.
Here is the console output from the web browser.
Here is my Nginx config file
# nginx.default
add_header X-Content-Type-Options nosniff;
include /etc/nginx/mime.types;
add_header X-XSS-Protection "1; mode=block";
server {
listen 8020;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
location / {
proxy_pass http://127.0.0.1:8010;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location /static {
root /home/app/codebase;
}
}
THe path of static folder inside docker container is /home/app/codebase/static/
Also added the following lines in the Django Settings.py file.
STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'static/')
Not sure what am I missing. Any leads will be appreciated.
I have looked into these questions. The problem is something similar but not sure what I'm missing.
Posting the solution in case anyone still facing the same kind of issue.
I provisioned all the resources using IaC (Cloud Formation) so while provisioning Load Balancer I created the one target group but at that time the ECS services were not created, so I created a dummy target group that drops the traffic and was not routing the traffic to any service.
And in ALB's path-based routing, the last route (which the traffic uses when the request does not find any route) was directing traffic to a dummy target group.
As soon as I changed the target group everything works like a charm.
Working Fine
Pro Tip:
Always use any of the target groups from your application in the last ALB rule.
I was setting up nginx on my aws ubuntu instance. At first every time went well, but after I config nginx and try to connect django, I can't even see the welcome page from either public ip nor the localhost(which was able to access from both sides). The nginx status command shows nginx is running.
Here's my nginx config:
/nginx/sites-available/mysite.com
server{
charset utf-8;
listen 80;
server_name my_aws_ip;
location /static{
alias my_django_static_path;
}
location / {
proxy_set_header Host $host;
proxy_pass http://unix:tmp/mysite.socket;
}
}
And I made a link to /nginx/sites-enabled/
It appears that every time I restarted nginx, I will be able to see the welcome page. However, after that, nginx refuses connections.
I didn't change anything in nginx.conf. Do I need to?
server_name should be your domain name, IP address should be specified as part of the listen directive
proxy_pass http://unix:tmp/mysite.socket;
Not sure where you are hoping this will end up, but you need to decide if you are sending it via http or to a socket. Not both. Having said that if it's for django then it's not proxy_pass you want at all
I'm guessing you mean:
uwsgi_pass unix:/tmp/mysite.socket;
You'll also need to include these somewhere in your config
I have an internal app server (Django+gunicorn) running behind an Nginx reverse proxy on a private port (listening on port 5000, for example.)
There are several Django apps installed in the app server, mapped to separate base paths. Example:
/app1
/app2
Where /app1 serves up content for domain1.com and /app2 serves content for domain2.com.
I'd like to silently reverse proxy incoming requests for specific hostnames to the related backend app, while preserving the path forwarded to the internal app server:
http://domain1.com/foo --> /app1/foo
http://domain1.com/bar/bletch --> /app1/bar/bletch
http://domain2.com/alpha/bravo --> /app2/alpha/bravo
I suppose you could say I'm trying to set up a simple 'virtual hosting' configuration but I want to use a shared back-end app server instance.
Key point: I don't want the visitor's browser to see the redirected URL structure. So when the client browser hits http://domain1.com/foo, the correct content is served up but the browser doesn't see a redirect.
I've done some basic work with Nginx (still learning) and I'm looking for example Nginx configurations demonstrating secure and efficient ways to accomplish this goal.
Based on this answer here's a configuration that seems to work as desired.
For app1 running on http://localhost:8000/app1_path :
upstream app1 {
server 127.0.0.1:8000 fail_timeout=0;
}
server {
listen 80;
server_name example.com
access_log /var/log/nginx/example.com.access.log;
error_log /var/log/nginx/example.com.error.log;
location / {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
rewrite ^(.*)$ /app1_path$1 break;
proxy_pass http://app1;
}
}
So, one could repeat this pattern as many times as desired for each hostname->app/path pair.
I've setup my Django application on Apache+mod_wsgi. To serve the static files I'm using Nginx, as suggested on Django's project website. http://docs.djangoproject.com/en/dev/howto/deployment/modwsgi/
Apache is running on port 8081 and nginx is on port 80. Now some people have suggested that my configuration is wrong and I should reverse the roles of Apache and Nginx. I'm not sure why that should be. And if indeed my configuration is wrong, why would django website suggest the wrong method?
The django docs you linked to do not suggest you use apache as a reverse proxy. They simply suggest you use a separate web server, so I'd say the docs are not clear on that subject -- they are not suggesting anything wrong.
My initial answer was assuming you had nginx as a reverse proxy because port 80 is the HTTP port, the one used when a browser attempts to go to a url with no port specified.
There are numerous complete guides to setting up nginx + apache via a quick google search but here is the gist for setting up nginx:
location / {
# proxy / requests to apache running django on port 8081
proxy_pass http://127.0.0.1:8081/;
proxy_redirect off;
}
location /media/ {
# serve static media directly from nginx
root /srv/anuva_project/www/;
expires 30d;
break;
}
All you need to do is remove the proxy lines from your apache configuration and add the proxy statements to your nginx.conf instead.
If you really want to serve your site from port 8081, you could potentially have nginx listen on port 8081 and have apache listen on a different port.
The point is, apache sits in some obscure port, only serving requests sent to it from nginx, while static file serving is handled by nginx.