Route ip+net: netlinkrib: too many open files


I am trying to get the local IP / LAN IP of a server which is having 50-60 API calls per second.
I am using below code but I face route ip+net: netlinkrib: too many open files lot of errors.
I tried commented code as well and was getting same error.

func GetOutboundIP() string {
	/* conn, err := net.Dial("udp", "")
	if err != nil {
	defer conn.Close()
	localAddr := conn.LocalAddr().(*net.UDPAddr)
	return localAddr.IP */
	addrs, err := net.InterfaceAddrs()
	if err != nil {
		return ""
	for _, a := range addrs {
		if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
			if ipnet.IP.To4() != nil {
				return ipnet.IP.String()
	return ""

Can you please advise how can I solve this error? I checked online reference but couldn’t find find relevant solution.

P.S. - Environment is running on load balancer behind proxy.

Edit :

ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 256974
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
**open files                      (-n) 102400**
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
**max user processes              (-u) 256974**
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited