with <= 120 nodes there is no issue, once it reaches to node 121 then I got an 
error:  /var/log/upstart/kube-apiserver.log

I1129 06:35:40.163511    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
I1129 06:35:41.163668    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
I1129 06:35:42.163800    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
I1129 06:35:43.163919    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
W1129 06:35:43.912814    7655 storage_extensions.go:83] third party resource 
sync failed: client: etcd cluster is unavailable or misconfigured
I1129 06:35:44.164048    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
I1129 06:35:45.164165    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
I1129 06:35:46.164277    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
I1129 06:35:47.164399    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
I1129 06:35:48.164524    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
I1129 06:35:49.164664    7655 logs.go:41] http: Accept error: accept tcp 
[::]:8080: accept4: too many open files; retrying in 1s
--------------------------------------------------------

root@ovrhxxxx:/var/log/upstart$ 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) 772117
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 100000
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) 772117
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
root@ovrhxxxx:/var/log/upstart$ 

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