☰

Ubuntu 16.04 上具有公用 IP 的 KVM 以及 NIC 子介面/別名

tag-icon • tag-icon networking linux-networking kvm-virtualization ufw
Ubuntu 16.04 上具有公用 IP 的 KVM 以及 NIC 子介面/別名

我想從網際網路連接到 VM1 (192.168.122.101)，即網際網路 (xx5.5/ens3:4) <-> VM1 (192.168.122.101)，但不影響其他網路（ens3、ens3:0- >3）。

問題是我的 VPS 只有一個實體網卡。其他 IP 為別名，如下圖所示。如果我橋接 ens3，別名不會被刪除嗎？

我跟著本指南依照字母順序，但ssh將 VM (@xx5.5) 連接到主 NIC/主機 (@88.88.88.88)。ssh本機 IP (@192.168.122.101) 連接到 VM。

我應該如何配置 VPS 上的網絡，使其為每個虛擬機（目前是一個虛擬機）分配一個可以連接到互聯網並充當網絡伺服器的私人 IP？如果 Ubuntu 16.04 無法實現所需的設置，那麼升級到 18/20.04 可以嗎？

配置：

  • OVH VPS
  • 烏班圖16.04
  • 鍵盤虛擬機
  • 烏夫沃
  • 虛擬min / webmin

網路（簡化）：

Internet
   \
   |
   +------------------------+
   | Ubuntu server          | virbr0 (192.168.122.1/24)
   +------------------------+ NAT
   | ens3: 88.88.88.88      |                    Static IP for VM
   +----------------+-------------+------------+-----------------+
   | ens3:0 x.x.1.1 |             | site1.com  | Virtualmin->www
   +----------------+-------------+------------+-----------------+
   | ens3:1 x.x.2.2 |             | site2.com  | Virtualmin->www
   +----------------+-------------+------------+-----------------+
   | ens3:2 x.x.3.3 |             | site3.com  | Virtualmin->www
   +----------------+-------------+------------+-----------------+
   | ens3:3 x.x.4.4 |             | site4.com  | Virtualmin->www
   +----------------+-------------+------------+-----------------+
   | ens3:4 x.x.5.5 |             | VM1/Ubuntu | 192.168.122.101
   +----------------+-------------+------------+-----------------+

目前IP配置：

root:~# ip a
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
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether fa:06:3f:2c:05:3b brd ff:ff:ff:ff:ff:ff
    inet 88.88.88.88/32 brd 88.88.88.88 scope global ens3
       valid_lft forever preferred_lft forever
    inet x.x.1.1/32 brd x.x.1.1 scope global ens3:0
       valid_lft forever preferred_lft forever
    inet x.x.2.2/32 brd x.x.2.2 scope global ens3:1
       valid_lft forever preferred_lft forever
    inet x.x.3.3/32 brd x.x.3.3 scope global ens3:2
       valid_lft forever preferred_lft forever
    inet x.x.4.4/32 brd x.x.4.4 scope global ens3:3
       valid_lft forever preferred_lft forever
    inet x.x.5.5/32 brd x.x.5.5 scope global ens3:4
       valid_lft forever preferred_lft forever
3: virbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 51:52:00:c9:9b:7d brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
    link/ether 51:52:00:c9:9b:7d brd ff:ff:ff:ff:ff:ff
6: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master virbr0 state UNKNOWN group default qlen 1000
    link/ether 50:54:00:46:ea:7c brd ff:ff:ff:ff:ff:ff

root:~# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether fa:06:3f:2c:05:3b brd ff:ff:ff:ff:ff:ff

virsh配置：

root:~# virsh net-dumpxml default
<network connections='1'>
  <name>default</name>
  <uuid>54b584b8-b2f5-45cb-a8e1-8d75540dc1a8</uuid>
  <forward mode='nat'>
    <nat>
      <port start='1024' end='65535'/>
    </nat>
  </forward>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='51:52:00:c9:9b:7d'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
  <range start='192.168.122.2' end='192.168.122.254'/>
    </dhcp>
  </ip>
</network>

root:~# virsh domifaddr dpcloud
 Name       MAC address          Protocol     Address
-------------------------------------------------------------------------------
 vnet0      50:54:00:46:ea:7c    ipv4         192.168.122.101/24

root:~# ssh [email protected]
...

root:~# ip a
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: ens2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:46:ea:7c brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.101/24 brd 192.168.122.255 scope global dynamic ens2
       valid_lft 3470sec preferred_lft 3470sec
    inet6 fe80::5054:ff:fe46:ea7c/64 scope link 
       valid_lft forever preferred_lft forever

答案1

我最終聽從了@ChaoxiangN的建議這裡：

  1. 刪除別名
  2. 設定網橋 (br0) 並向其新增其他 IP
  3. 使用自己的橋接網路 (virbr0) 設定 KVM 虛擬機

然後，我使用 iptables 啟用 NAT，而不是「4/ 在來賓內部，設定 ipv4 以使用其他 IP」：

root:~# iptables -t nat -I PREROUTING -p tcp -d 111.122.133.144 --dport 1:65535 -j DNAT --to-destination 192.168.122.88:1-65535
root:~# iptables -I FORWARD -m state -d 192.168.122.0/24 --state NEW,RELATED,ESTABLISHED -j ACCEPT

注意：111.122.133.144=公用IP，192.168.122.88=VM1 IP

ssh [email protected]
...

user@VM1:~$ ip a
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: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:32:00:11:20:88 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.88/24 brd 192.168.122.255 scope global dynamic enp1s0
       valid_lft 3576sec preferred_lft 3576sec
    inet6 fe80::5054:ff:fe73:2096/64 scope link 
       valid_lft forever preferred_lft forever

相關內容