LXC容器与具有internet接入的主机在同一网络上

Question

首先，让我告诉您我正在尝试实现什么样的网络配置：

1. LXC容器应该暴露在我的本地网络中。
2. LXC容器应该具有internet访问权限。

以下是我到目前为止所取得的成就：

为了在上面的配置中实现需求1，我已经提到了将eth0 0转换为br0，并将所有LXC或LXD都放到局域网中。然而，LXC没有互联网连接。

其他一些意见：

• 除了LXC容器之外，我还可以从网络上的所有设备上切换到&。
• 我能够从LXC容器到它的主机: Ubuntu。

我在这个论坛上提到了一些与我的问题有关的话题，但都没有用。对于how在容器内启用internet访问有何想法？

主机上的

(Ubuntu )

ajinkya@metaverse:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.2 LTS
Release:    20.04
Codename:   focal
ajinkya@metaverse:~$ lxc-ls --version
4.0.6
ajinkya@metaverse:~$ uname -a
Linux metaverse 5.11.0-25-generic #27~20.04.1-Ubuntu SMP Tue Jul 13 17:41:23 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
------------------------------------------------------------------------------------
ajinkya@metaverse:~$ ip a show
1: lo:  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: enp0s3:  mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 08:00:27:db:a6:da brd ff:ff:ff:ff:ff:ff
3: br0:  mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 08:00:27:db:a6:da brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.161/24 brd 192.168.0.255 scope global dynamic br0
       valid_lft 85283sec preferred_lft 85283sec
    inet6 fd01::124:c625:211:6384/64 scope global temporary dynamic 
       valid_lft 251sec preferred_lft 251sec
    inet6 fd01::a00:27ff:fedb:a6da/64 scope global dynamic mngtmpaddr 
       valid_lft 251sec preferred_lft 251sec
    inet6 fe80::a00:27ff:fedb:a6da/64 scope link 
       valid_lft forever preferred_lft forever
4: veth1000_JY5u@if2:  mtu 1500 qdisc noqueue master br0 state UP group default qlen 1000
    link/ether fe:03:d9:b4:05:29 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet6 fe80::fc03:d9ff:feb4:529/64 scope link 
       valid_lft forever preferred_lft forever

------------------------------------------------------------------------------------
ajinkya@metaverse:~$ brctl show
bridge name bridge id           STP enabled      interfaces
br0         8000.080027dba6da   no               enp0s3
                                                 veth1000_JY5u
------------------------------------------------------------------------------------
ajinkya@metaverse:~$ cat /etc/default/lxc-net
# This file is auto-generated by lxc.postinst if it does not
# exist.  Customizations will not be overridden.
# Leave USE_LXC_BRIDGE as "true" if you want to use lxcbr0 for your
# containers.  Set to "false" if you'll use virbr0 or another existing
# bridge, or mavlan to your host's NIC.
USE_LXC_BRIDGE="false"

# If you change the LXC_BRIDGE to something other than lxcbr0, then
# you will also need to update your /etc/lxc/default.conf as well as the
# configuration (/var/lib/lxc//config) for any containers
# already created using the default config to reflect the new bridge
# name.
# If you have the dnsmasq daemon installed, you'll also have to update
# /etc/dnsmasq.d/lxc and restart the system wide dnsmasq daemon.
LXC_BRIDGE="lxcbr0"
LXC_ADDR="10.0.3.1"
LXC_NETMASK="255.255.255.0"
LXC_NETWORK="10.0.3.0/24"
LXC_DHCP_RANGE="10.0.3.2,10.0.3.254"
LXC_DHCP_MAX="253"
# Uncomment the next line if you'd like to use a conf-file for the lxcbr0
# dnsmasq.  For instance, you can use 'dhcp-host=mail1,10.0.3.100' to have
# container 'mail1' always get ip address 10.0.3.100.
#LXC_DHCP_CONFILE=/etc/lxc/dnsmasq.conf

# Uncomment the next line if you want lxcbr0's dnsmasq to resolve the .lxc
# domain.  You can then add "server=/lxc/10.0.3.1' (or your actual $LXC_ADDR)
# to your system dnsmasq configuration file (normally /etc/dnsmasq.conf,
# or /etc/NetworkManager/dnsmasq.d/lxc.conf on systems that use NetworkManager).
# Once these changes are made, restart the lxc-net and network-manager services.
# 'container1.lxc' will then resolve on your host.
#LXC_DOMAIN="lxc"
------------------------------------------------------------------------------------
ajinkya@metaverse:~$ cat /etc/lxc/default.conf 
lxc.net.0.type = veth
lxc.net.0.link = br0
lxc.net.0.flags = up
lxc.net.0.hwaddr = 00:16:3e:xx:xx:xx
------------------------------------------------------------------------------------
ajinkya@metaverse:~$ cat .config/lxc/default.conf
lxc.include = /etc/lxc/default.conf
lxc.idmap = u 0 100000 65536
lxc.idmap = g 0 100000 65536
------------------------------------------------------------------------------------
ajinkya@metaverse:~$ lxc-ls --fancy
NAME STATE   AUTOSTART GROUPS IPV4          IPV6                     UNPRIVILEGED 
con1 RUNNING 0         -      192.168.0.185 fd01::216:3eff:fe67:d14e true 
------------------------------------------------------------------------------------

容器上的

root@con1:/# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.7 LTS
Release:    16.04
Codename:   xenial
root@con1:/# uname -a
Linux con1 5.11.0-25-generic #27~20.04.1-Ubuntu SMP Tue Jul 13 17:41:23 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
------------------------------------------------------------------------------------
root@con1:/# ip a show
1: lo:  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: eth0@if4:  mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:16:3e:67:d1:4e brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 192.168.0.185/24 brd 192.168.0.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fd01::216:3eff:fe67:d14e/64 scope global mngtmpaddr dynamic 
       valid_lft 272sec preferred_lft 272sec
    inet6 fe80::216:3eff:fe67:d14e/64 scope link 
       valid_lft forever preferred_lft forever
------------------------------------------------------------------------------------
root@con1:/# ping google.com
ping: unknown host google.com
------------------------------------------------------------------------------------
root@con1:/# ping 192.168.0.161
PING 192.168.0.161 (192.168.0.161) 56(84) bytes of data.
64 bytes from 192.168.0.161: icmp_seq=1 ttl=64 time=0.115 ms
64 bytes from 192.168.0.161: icmp_seq=2 ttl=64 time=0.133 ms
64 bytes from 192.168.0.161: icmp_seq=3 ttl=64 time=0.189 ms
64 bytes from 192.168.0.161: icmp_seq=4 ttl=64 time=0.127 ms
^C
--- 192.168.0.161 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3069ms
rtt min/avg/max/mdev = 0.115/0.141/0.189/0.028 ms
------------------------------------------------------------------------------------

Answer 1

根据这一点：

ping: unknown host google.com

容器的/etc/resolv.conf中没有有效的DNS服务器。编辑它并包括nameserver x.x.x.x行以匹配您的DNS服务器。或者在容器中安装本地递归名称服务器，比如dnsmasq。

例如，您可以使用Google公共DNS服务器：

nameserver 8.8.8.8
nameserver 8.8.4.4

如果这不起作用，您可以尝试首先从容器(即不使用DNS名称)，例如ping 8.8.8.8，从容器中选择有效的Internet。此外，您还应该检查您是否能够从您的容器中平平您真正的主机Ubuntu 192.168.0.166。应该是可达的。