proxy_bind with hostname from /etc/hosts possible?
is it possible to use an hostname from local /etc/hosts as proxy_bind
In our current
We use nginx 1.8.1 as reverse proxy.
In order to overcome the "Overcoming Ephemeral Port Exhaustion" problem
(64k+ connections), we use proxy_bind to iterate over all loccally available
IP addresses and assign them as source IP (see
In order to have an generic nginx configuration for all of our nginx
instances, we don't want to hard code server specific IPs in the nginx.conf
but use hostnames that are defined in the local /etc/hosts.
You can see our current configuration above.
Unfortunately nginx cannot resolve the hostname (localip0 etc.). There is an
error log "invalid local address "localip0"...).
We also tested the usage of upstream directive. Same result.
I'm worry that I only can use explicit IP addresses in this situation. Or do
you have an alternative solution?
> You can see our current configuration above.
> Unfortunately nginx cannot resolve the hostname (localip0 etc.). There is an
> error log "invalid local address "localip0"...).
If you dive into the source code, you'll see that that error message
happens when a call to "ngx_parse_addr_port()" fails; and that function
does what its name suggests.
> I'm worry that I only can use explicit IP addresses in this situation. Or do
> you have an alternative solution?
I think you'll need to use IP addresses.
An option (untested) could be to put the split_clients call into an
external file which you "include" in your common nginx.conf, and let
*that* file be generated unique per host.
And another option could be to have a common nginx-conf-precursor
which is distributed to all hosts, and then run a pre-processor of your
choice against it to create the individual unique nginx.conf files.