Ip_hash detailed behaviour

Server NGINX
1

Hello

I would like to know more about the behaviour of ip_hash when NGINX is
reloaded and in the scenario of removing an upstream node.

Is ip_hash somehow clever/sticky and would reasign the IPs to the same
node
after a reload or restart? and what would happen if an upstream node is
marked/flagged as down.

I’m not sure if this is the correct list or i should write to nginx-dev.

Regards

M

2

Hello!

On Fri, Nov 15, 2013 at 03:13:44PM -0200, Martin Loy wrote:

Hello

I would like to know more about the behaviour of ip_hash when NGINX is
reloaded and in the scenario of removing an upstream node.

Is ip_hash somehow clever/sticky and would reasign the IPs to the same node
after a reload or restart?

The ip_hash just uses a hash function to distribute clients among
configured upstream servers. If a number of upstream servers
changes, the distribution changes as well.

and what would happen if an upstream node is
marked/flagged as down.

In this case clients which are normally passed to the server
marked down will be distributed between other servers.

See http://nginx.org/r/ip_hash for more details.

–
Maxim D.
http://nginx.org/en/donation.html