下载地址：

　　http://cdimage.ubuntu.com/releases/

#：配置多网卡静态IP地址和路由

root@ubuntu:~# vim /etc/netplan/01-netcfg.yaml
network:
version: 2
renderer: networkd
ethernets:
eth0:
dhcp4: no
dhcp6: no
addresses: [192.168.7.101/21]
gateway4: 192.168.7.254
nameservers:
addresses: [172.16.0.1]
eth1:
dhcp4: no
dhcp6: no
addresses: [10.20.7.101/21]
routes:
- to: 172.16.20.0/16
via: 10.20.0.1
- to: 10.30.0.0/16
via: 10.20.0.1

#：重启网卡

root@ubuntu:~# netplan apply

#：单网卡桥接

root@ubuntu:~# vim /etc/netplan/01-netcfg.yaml
network:
version: 2
renderer: networkd
ethernets:
eth0:
dhcp4: no
dhcp6: no

bridges:
br0:
dhcp4: no
dhcp6: no
addresses: [172.16.14.55/16]
gateway4: 172.16.0.1
nameservers:
addresses: [172.16.0.1]
interfaces:
- eth0

#：多网卡桥接
root@ubuntu:~# vim /etc/netplan/01-netcfg.yaml

eth0:  
  dhcp4: no  
  dhcp6: no  
eth1:  
  dhcp4: no  
  dhcp6: no

bridges:
br0:
dhcp4: no
dhcp6: no
addresses: [172.16.14.55/16]
gateway4: 172.16.0.1
nameservers:
addresses: [172.16.0.1]
interfaces:
- eth0
br1:
dhcp4: no
dhcp6: no
addresses: [172.16.14.66/16]
gateway4: 172.16.0.1
interfaces:
- eth1

#：双网卡绑定

root@ubuntu:~# vim /etc/netplan/01-netcfg.yaml

For more information, see netplan(5).

network:
version: 2
renderer: networkd
ethernets:
eth0:
dhcp4: no
dhcp6: no
eth1:
dhcp4: no
dhcp6: no

bonds:
bond0:
interfaces:
- eth0
- eth1
addresses: [172.16.14.66/16]
gateway4: 172.16.0.1
nameservers:
addresses: [172.16.0.1, 180.76.76.76]
parameters:
mode: active-backup
mii-monitor-interval: 100

#: 内外网多网卡绑定
root@ubuntu:~# vim /etc/netplan/01-netcfg.yaml

This file describes the network interfaces available on your system

For more information, see netplan(5).

network:
version: 2
renderer: networkd
ethernets:
eth0:
dhcp4: no
dhcp6: no
eth1:
dhcp4: no
dhcp6: no
eth2:
dhcp4: no
dhcp6: no
eth3:
dhcp4: no
dhcp6: no

bonds:
bond0:
interfaces:
- eth0
- eth1
addresses: [172.16.14.66/16]
gateway4: 172.16.0.1
nameservers:
addresses: [172.16.0.1, 180.76.76.76]
parameters:
mode: active-backup
mii-monitor-interval: 100

bond1:  
  interfaces:  
    - eth2  
    - eth3  
  addresses: \[10.20.7.101/21\]  
  parameters:  
    mode: active-backup  
    mii-monitor-interval: 100

软件包管理

#：修改yum源为阿里云的（参考阿里云官网：https://opsx.alibaba.com/mirror）

root@ubuntu:~# vim /etc/apt/sources.list

root@ubuntu:~# apt update

1 # apt list #列出已经安装的软件包
2 # apt install apache2 #安装软件包
3 # apt remove apache2 #卸载软件包但是保留配置文件
4 # apt purge apache2 #卸载软件包删除配置文件
5 # apt update #更新本地软件包列表索引，修改了apt仓库后必须执行
6 # apt upgrade #升级所有已安装且可升级到新版本的软件包
7 # apt-cache madison nginx #查看仓库中软件包有哪些版本可以安装
8 # apt install nginx=1.14.0-0ubuntu1.6 #安装软件包的时候指定安装具体的版本

系统优化

root@ubuntu:~# vim /etc/security/limits.conf
root soft core unlimited
root hard core unlimited
root soft nproc 1000000
root hard nproc 1000000
root soft nofile 1000000
root hard nofile 1000000
root soft memlock 32000
root hard memlock 32000
root soft msgqueue 8192000
root hard msgqueue 8192000

#:重启