1)
root@kq-zr5b4mgj6rgi5a5dekkqkf2k64-0:~# netstat -tuplen
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode       PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      0          14222       1241/sshd
tcp        0      0 127.0.0.1:10248         0.0.0.0:*               LISTEN      0          53593       12831/kubelet
tcp        0      0 127.0.0.1:10249         0.0.0.0:*               LISTEN      0          57607       13390/hyperkube
tcp        0      0 127.0.0.1:2379          0.0.0.0:*               LISTEN      0          44419       10146/etcd
tcp        0      0 10.1.0.3:2379           0.0.0.0:*               LISTEN      0          44418       10146/etcd
tcp        0      0 10.1.0.3:2380           0.0.0.0:*               LISTEN      0          44417       10146/etcd
tcp        0      0 127.0.0.1:8080          0.0.0.0:*               LISTEN      0          59549       13596/hyperkube
tcp        0      0 127.0.0.1:10256         0.0.0.0:*               LISTEN      0          57605       13390/hyperkube
tcp6       0      0 :::22                   :::*                    LISTEN      0          14224       1241/sshd
tcp6       0      0 :::10250                :::*                    LISTEN      0          53600       12831/kubelet
tcp6       0      0 :::10251                :::*                    LISTEN      0          63074       14198/hyperkube
tcp6       0      0 :::6443                 :::*                    LISTEN      0          58268       13596/hyperkube
tcp6       0      0 :::10252                :::*                    LISTEN      0          63624       14305/hyperkube

2)
root@kq-zr5b4mgj6rgi5a5dekkqkf2k64-0:~# nmap -p 2379 172.17.48.53

Starting Nmap 7.01 ( https://nmap.org ) at 2018-08-29 10:44 UTC
Nmap scan report for kq-zr5b4mgj6rgi5a5dekkqkf2k64-0 (172.17.48.53)
Host is up (0.000088s latency).
PORT     STATE  SERVICE
2379/tcp closed unknown

3)
root@kq-zr5b4mgj6rgi5a5dekkqkf2k64-0:~# ifconfig
...
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:90575 errors:0 dropped:0 overruns:0 frame:0
          TX packets:90575 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:15712976 (15.7 MB)  TX bytes:15712976 (15.7 MB)

root@kq-zr5b4mgj6rgi5a5dekkqkf2k64-0:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet 172.17.48.53/32 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
4)
root@kq-zr5b4mgj6rgi5a5dekkqkf2k64-0:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# Source interfaces
# Please check /etc/network/interfaces.d before changing this file
# as interfaces may have been defined in /etc/network/interfaces.d
# See LP: #1262951
source /etc/network/interfaces.d/*.cfg

root@kq-zr5b4mgj6rgi5a5dekkqkf2k64-0:~# cat /etc/network/interfaces.d/50-cloud-init.cfg
# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
auto lo
iface lo inet loopback
    dns-nameservers 172.18.80.136

auto ens3
iface ens3 inet static
    address 10.1.0.3/16
    post-up route add default gw 10.1.0.1 || true
    pre-down route del default gw 10.1.0.1 || true