Ram usage keeps climbing !

Hello,

​

I'm pretty new to nginx but I have an issue you guys might be able to help. I have an LXC container with 2 CPU and 512MB of ram running an nginx reverse proxy for websites and tcp load balancing (postgres).

​

The proxy runs fine for around 90 days which is the time it takes for the whole ram to be filled up. We don't serve a lot of queries (around 1 mb/s of traffic) so I feel like adding more ram to the container will just slow down the problem.

​

Here's a picture of the ram usage (the drop is the restart of the server):

[https://imgur.com/K4kbICW](https://imgur.com/K4kbICW)

[https://imgur.com/Cr5ahUB](https://imgur.com/Cr5ahUB)

Here are 2 of my config files, maybe you guys could enlighten me if any settings might cause this ?

​

TCP load balancing for postgres:

upstream prod_db {
zone prod_db 64k;
server prod-db-1:5432;
server prod-db-2:5432 backup;
}

server {
listen 8001;
proxy_pass prod_db;
proxy_timeout 4h;
proxy_connect_timeout 1s;
}

and here's a simple of a site config:

upstream prod_web_1 {
server prod-web-1;
server prod-web-2;
keepalive 32;
}

proxy_cache_path /var/cache/nginx_prod_web_1 levels=1:2 keys_zone=prod_web_1_cache:10m max_size=512m use_temp_path=off;

# HTTP to HTTPS

server {
listen 80;
server_name web.example.com;
return 301 https://$host$request\_uri;
}

server {
listen 443 ssl;
server_name web.example.com;

ssl_certificate /etc/ssl/private/web.example.com.pem;
ssl_certificate\_key /etc/ssl/private/web.example.com.key;

location / {
proxy_set_header Host $host;
proxy_set_header Connection "";
proxy_http_version 1.1;
proxy_buffers 256 16k;
proxy_buffer_size 16k;
proxy_cache_use_stale timeout;
proxy_cache prod_web_1_cache;
expires 365d;
add_header Cache-Control "public";
proxy_pass http://prod_web_1;
}

# Custom pages for error codes
error_page 403 /errors/403.html;
error_page 404 /errors/404.html;
error_page 500 /errors/500.html;
error_page 502 /errors/502.html;
error_page 503 /errors/503.html;
error_page 504 /errors/504.html;

location /errors/ {
alias /var/www/html/errors/;
}
}