ubuntu 18.04 set a static ip method

1 Introduction

This tutorial will demonstrate how to set a static IP address fixed Ubuntu16.04 Server Edition and Ubuntu18.04 Server version of the system.

2. Confirm that you want to modify the card number

Make sure that you want to modify the card number, assuming your server multiple network cards:

ubuntu1804:~$ ip addr

My server configuration is as follows:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:0c:29:f1:b5:e1 brd ff:ff:ff:ff:ff:ff
inet 172.16.87.140/24 brd 172.16.87.255 scope global dynamic ens33
valid_lft 1500sec preferred_lft 1500sec
inet6 fe80::20c:29ff:fef1:b5e1/64 scope link
valid_lft forever preferred_lft forever

3. Default card configuration file

By default, the network uses DHCP

ubuntu1804: ~ $ cat /etc/netplan/50-cloud-init.yaml 
profile follows 

Network: 
    Ethernets: 
        ens33: 
            dhcp4: Yes 
            Addresses: [] 

    Version: 2

4. Set a static IP

Need to modify the configuration file for the following:

ubuntu1804: ~ $ sudo vi /etc/netplan/50-cloud-init.yaml

Assume that the IP address modification is 192.168.1.100, subnet mask, i.e. 24 255.255.255.0, gateway to 192.168.1.1, DNS1: 223.5.5.5, DNS2: 223.6.6.6

network:
    ethernets:
        ens33:
            dhcp4: no
            addresses: [192.168.1.100/24]
            optional: true
            gateway4: 192.168.1.1
            nameservers:
                    addresses: [223.5.5.5,223.6.6.6]

    version: 2

5. Apply the new configuration

ubuntu1804:~$ sudo netplan apply

Use ip addrcheck new address

ubuntu1804:~$ ip addr

6. Test Network Connectivity

ubuntu1804:~$ ping 192.168.1.100