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KVM com IP público no Ubuntu 16.04 com subinterfaces/aliases NIC

tag-icon • tag-icon networking linux-networking kvm-virtualization ufw
KVM com IP público no Ubuntu 16.04 com subinterfaces/aliases NIC

Quero me conectar à VM1 (192.168.122.101) de/para a internet, ou seja, Internet (xx5.5/ens3:4) <-> VM1 (192.168.122.101) sem impactar as outras redes (ens3, ens3:0- >3).

O problema é que meu VPS possui apenas uma NIC física. Outros IPs são aliases conforme exibido no diagrama abaixo. Se eu fizer a ponte entre ens3, os aliases não serão removidos?

eu seguieste guiaao pé da letra, mas sshà VM (@xx5.5) se conecta ao NIC/host principal (@88.88.88.88). sshao IP local (@192.168.122.101) se conecta à VM.

Como devo configurar a rede no VPS para atribuir a cada VM (atualmente uma VM) um IP privado que possa se conectar à Internet e atuar como um servidor web? Se a configuração desejada não for possível com o Ubuntu 16.04, uma atualização para 18/20.04 funcionaria?

Configuração:

  • VPS OVH
  • Ubuntu 16.04
  • KVM
  • ufw
  • virtualmin /webmin

Rede (simplificada):

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
   +----------------+-------------+------------+-----------------+

Configuração de IP atual:

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

configuração virsh:

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

Responder1

Acabei seguindo o conselho de @ChaoxiangNaqui:

  1. Remover aliases
  2. Configure uma bridge (br0) e adicione outros IPs a ela
  3. Configure VMs KVM com sua própria rede em ponte (virbr0)

Então, em vez de "4/ dentro do convidado, configure o ipv4 para usar outros IPs", habilitei o NAT com iptables:

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

Nota: 111.122.133.144= IP público, 192.168.122.88= IP VM1

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

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