Here is why?
root@ovrh0301:/home/envi# 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
-----------------------------------------
envi@ovrh0301:~$ ps aux | grep kube-apiserver
root      3539  5.5  0.1 300696 252292 ?       Ssl  11:09  10:26 
/opt/bin/kube-apiserver --insecure-bind-address=0.0.0.0 --insecure-port=8080 
--etcd-servers=http://127.0.0.1:4001 --logtostderr=true 
--service-cluster-ip-range=192.168.3.0/24 
--admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,SecurityContextDeny,DefaultStorageClass,ResourceQuota
 --service-node-port-range=30000-32767 --advertise-address=172.31.0.200 
--allow-privileged=false --client-ca-file=/srv/kubernetes/ca.crt 
--tls-cert-file=/srv/kubernetes/server.cert 
--tls-private-key-file=/srv/kubernetes/server.key
envi      5546  0.0  0.0  11748  2164 pts/0    S+   14:18   0:00 grep 
--color=auto kube-apiserver
envi@ovrh0301:~$ 
-------------------------------------------
root@ovrh0301:/home/envi# cat /proc/3539/limits
Limit                     Soft Limit           Hard Limit           Units     
Max cpu time              unlimited            unlimited            seconds   
Max file size             unlimited            unlimited            bytes     
Max data size             unlimited            unlimited            bytes     
Max stack size            8388608              unlimited            bytes     
Max core file size        0                    unlimited            bytes     
Max resident set          unlimited            unlimited            bytes     
Max processes             772117               772117               processes 
Max open files            1024                 4096                 files     
Max locked memory         65536                65536                bytes     
---------------
envi@ovrh0301:~$  sudo ls -l /proc/3539/fd
total 0
lrwx------ 1 root root 64 Nov 30 14:08 0 -> /dev/null
lrwx------ 1 root root 64 Nov 30 14:08 1 -> /dev/pts/7
lrwx------ 1 root root 64 Nov 30 14:08 10 -> socket:[69672]
lrwx------ 1 root root 64 Nov 30 14:08 100 -> socket:[69680]
lrwx------ 1 root root 64 Nov 30 14:08 1000 -> socket:[43353]
lrwx------ 1 root root 64 Nov 30 14:08 1001 -> socket:[73034]
lrwx------ 1 root root 64 Nov 30 14:08 1002 -> socket:[89431]
lrwx------ 1 root root 64 Nov 30 14:08 1003 -> socket:[86357]
lrwx------ 1 root root 64 Nov 30 14:08 1004 -> socket:[31818]
lrwx------ 1 root root 64 Nov 30 14:08 1005 -> socket:[86359]
lrwx------ 1 root root 64 Nov 30 14:08 1006 -> socket:[76133]
lrwx------ 1 root root 64 Nov 30 14:08 1007 -> socket:[75086]
lrwx------ 1 root root 64 Nov 30 14:08 1008 -> socket:[89433]
lrwx------ 1 root root 64 Nov 30 14:08 1009 -> socket:[73039]
lrwx------ 1 root root 64 Nov 30 14:08 101 -> socket:[11624]
lrwx------ 1 root root 64 Nov 30 14:08 1010 -> socket:[43394]
lrwx------ 1 root root 64 Nov 30 14:08 1011 -> socket:[75091]
lrwx------ 1 root root 64 Nov 30 14:08 1012 -> socket:[43358]
lrwx------ 1 root root 64 Nov 30 14:08 1013 -> socket:[44369]
lrwx------ 1 root root 64 Nov 30 14:08 1014 -> socket:[86361]
lrwx------ 1 root root 64 Nov 30 14:08 1015 -> socket:[73042]
lrwx------ 1 root root 64 Nov 30 14:08 1016 -> socket:[18776]
lrwx------ 1 root root 64 Nov 30 14:08 1017 -> socket:[73045]
lrwx------ 1 root root 64 Nov 30 14:08 1018 -> socket:[76135]
lrwx------ 1 root root 64 Nov 30 14:08 1019 -> socket:[65864]
lrwx------ 1 root root 64 Nov 30 14:08 102 -> socket:[31093]
lrwx------ 1 root root 64 Nov 30 14:08 1020 -> socket:[44371]
lrwx------ 1 root root 64 Nov 30 14:08 1021 -> socket:[89437]
lrwx------ 1 root root 64 Nov 30 14:08 1022 -> socket:[75097]
lrwx------ 1 root root 64 Nov 30 14:08 1023 -> socket:[73048]
lrwx------ 1 root root 64 Nov 30 14:08 103 -> socket:[36939]

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