ubuntu设置静态ip

virtual box中安装了ubuntu，ip地址会变化，导致项目里的jdbc和mobaxterm经常需要重新设置ip，所以给ubuntu设置一个静态ip

sudo vim /etc/netplan/50-cloud-init.yaml  ## ymal文件不一定叫这个名字，总之就是这个目录下类似的ymal

修改之前是这样的：

# 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}
network:
    ethernets:
        enp0s3:
            dhcp4: true
    version: 2
~

修改成下面这样

network:
    ethernets:
        enp0s3:
            dhcp4: no
            dhcp6: no
            addresses: [192.168.1.102/24]
            gateway4: 192.168.1.1
            nameservers:
                 addresses: [8.8.8.8]
    version: 2


## 如果报这个错

## Error in network definition /etc/netplan/50-cloud-init.yaml line 12 column 25: expected mapping
     ##       ... ... 
        ##    addresses: [192.168.1.102/24]
           ## gateway: 192.168.1.1
           ##  nameservers: 8.8.8.8
            ... ...
## 是因为nameservers那里，不是直接跟上ip，对比上面正确的就看出来了

sudo netplan apply  ## 生效

特别看不起那一类人 18.04都已经换了网络配置文件了，他们还在自己所谓的教程里写 sudo vi /etc/network/interfaces，那么大的replaced看不着啊？