Which statement best describes how the ip_hash directive in NGINX helps maintain session persistence?
Think about what information NGINX can use without storing session data.
The ip_hash directive uses the client's IP address to ensure requests from the same client go to the same backend server, maintaining session persistence without storing session data.
Given this NGINX upstream configuration, what will be the output of nginx -t?
upstream backend {
ip_hash;
server backend1.example.com;
server backend2.example.com;
}
server {
listen 80;
location / {
proxy_pass http://backend;
}
}Check if the ip_hash directive is valid in upstream context.
The ip_hash directive is valid in the upstream block. The configuration syntax is correct, so nginx -t reports success.
After enabling ip_hash in NGINX, users report sessions are not sticky and requests go to different backend servers. What is the most likely cause?
Consider how NGINX sees client IPs when behind another proxy.
If clients connect through a proxy or load balancer, NGINX may see the proxy's IP instead of the real client IP, causing all requests to hash to the same backend server or fail to maintain session persistence.
Arrange the steps in the correct order to enable IP hash session persistence for a backend in NGINX.
Think about defining backend servers before applying ip_hash and proxying.
First define the upstream block with servers, then add ip_hash inside it, configure the server block to use the upstream, and finally test and reload NGINX.
When using ip_hash in NGINX behind a reverse proxy or load balancer, what is the best practice to ensure session persistence works correctly?
How can NGINX know the real client IP when behind another proxy?
Behind proxies, NGINX sees the proxy IP by default. Using the real_ip_module to extract the real client IP from headers like X-Forwarded-For allows ip_hash to work properly.