安装好Ubuntu系统后，可使用下面的配置优化系统

1.修改root用户的密码

sudo passwd root
输入密码
再次输入密码

2.修改配置，使root用户可以远程登录和开机可以使用root登录

sudo sed -i ‘[email?protected] n || [email?protected] -s && mesg n || [email?protected]‘ /root/.profile

sudo sed -i ‘[email?protected] n || [email?protected] -s && mesg n || [email?protected]‘ /root/.profile

验证：
查看/root/.profile文件是下面的样子就行

[email?protected]:~# cat /root/.profile
# ~/.profile: executed by Bourne-compatible login shells.

if [ "$BASH" ]; then
  if [ -f ~/.bashrc ]; then
    . ~/.bashrc
  fi
fi

tty -s tty -s mesg n || true
[email?protected]:~#

以上配置生效，需重启系统

3.修改Ubuntu的apt源

1.打开阿里云的Ubuntu源

https://opsx.alibaba.com/mirror

2.找到Ubuntu那一行，点击后面的“帮助”

3.根据上面的提示，打开“/etc/apt/sources.list”文件

• 把文件里默认的配置都清除

vi /etc/apt/sources.list

4.选择Ubuntu的版本，然后复制apt源的配置，如ubuntu 18.04(bionic) 配置如下：

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

5.更新apt源

apt-get update

6.更新apt源后，就可以用apt-get安装软件了

示例：安装haproxy和keepalived软件
apt-get install haproxy keepalived

输入“y”,确认安装

4.修改主机名

1.修改主机名
vi /etc/hostname
主机名

2.使主机名生效
reboot

5.修改默认ubuntu的网卡名称为“eth”格式

1.修改配置文件 vi /etc/default/grub

2.在GRUB_CMDLINE_LINUX添加内容
    GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"

3.生效新的grub.cfg文件
    grub-mkconfig -o /boot/grub/grub.cfg

4.修改网卡配置文件的名称  
把原来的"ensxx" 改为 “ethxx”

5.重启系统生效