This guide will help you to fix the issue when Nomad / Consul are binding jobs on the wrong interface.
Get your private interface
First, run ifconfig to check if the interface is available and get it's name.
enp7s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450
inet 10.4.0.3 netmask 255.255.255.255 broadcast 10.4.0.3
inet6 fe80::8400:ff:fe74:ac5c prefixlen 64 scopeid 0x20<link>
ether 86:00:00:74:af:6a txqueuelen 1000 (Ethernet)
RX packets 8370677 bytes 1497631969 (1.4 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7785709 bytes 1158079549 (1.1 GB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
If your networking is configured correctly you will find your private interface named like ens..., enp....
Fix
You can either hardcode the interface name or use the go-sockaddr/template templating language to get the private interface name.
The following example will get the name of the first network interface in the 10.0.0.0/8 address space (this will match all ip addresses from 10.0.0.0 to 10.255.255.255).
client {
# use go-sockaddr/template
network_interface = "{{ GetPrivateInterfaces | include \"network\" \"10.0.0.0/8\" | attr \"name\" }}"
# hardcode the interface name
network_interface = "enp7s0"
}
It's important to restart Nomad and all jobs afterwards. Only restarting Nomad will not be enough since the job will keep running in the background.
References
See Nomad network_interface Docs
Troubleshooting
To see all configuration values and debug info, run nomad operator debug and quit using Ctrl+C. A .tar.gz file will be created in the current directory. Download, extract it and check the cluster/agent-self.json file for the NetworkInterface value to see if the value has been set correctly.
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