Bind consul to correct private IP when GetPrivateInterfaces returns more than one.

[jserpapinto]

Hey,

I don't know GO. I'm running consul on DigitalOcean and I need to bind it to a private address. My issue is:

DigitalOcean has two private IP's because of it's Floating IP functionality, so all Droplets come with two private IP's.

[root@xxx-consul-server-0 ~]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         gateway         0.0.0.0         UG    0      0        0 eth0
10.19.0.0       0.0.0.0         255.255.0.0     U     0      0        0 eth0
10.135.0.0      0.0.0.0         255.255.0.0     U     0      0        0 eth1
link-local      0.0.0.0         255.255.0.0     U     1002   0        0 eth0
link-local      0.0.0.0         255.255.0.0     U     1003   0        0 eth1
xxxxxxxxx     0.0.0.0         255.255.240.0   U     0      0        0 eth0

I was trying to run this with a command I checked in consul's page:

'GetPrivateInterfaces | include "network" "10.0.0.0/8" | attr "address"'

But it returns the "Floating IP" private IP instead of the Droplet's private IP.

So, I understood that with this command I was returning both IP addresses, filtering the cidr block and fetching one of the IP's. But the one it was being returned is the wrong one.

I got to this dumb solution:

'GetPrivateInterfaces | include "network" "10.0.0.0/8" | sort "-name" | attr "address"'

Where I just invert the sort by name and it returns me the one I want.

I'm wondering how should this be correctly done.

Thank you all.

[karl-tpio]

10.19.0.0 and 10.135.0.0 both have 255.255.0.0 as their netmask.

You're correct when you say filtering the cidr block but you're not using the filter as you need to as both 10.135/16 and 10.19/16 fall under 10/8. Change the filter so that it's scoped to which ever IP address you want.