Running the LXC virtual machine on Ubuntu

Background: Because of job testing needs, testing software features on different hosts, but no separate virtual machines can be used, think of using LXC for lightweight virtualization. The LXC virtual machine chooses the virtual Macvlan NIC on the host for use by the virtual machine. Host Eth0 Network address when the 192.168.85.153, the host's gateway is 192.168.85.1, the network of the virtual machine is divided into two situations, one is to use a separate network, 192.168.100.0/24. Another is the automatic acquisition of the same IP network as the host.

Host Preparation:

1 host turn on forwarding function, add Net.ipv4.ip_forward = 1 in/etc/sysctl.conf. Then execute sysctl-p

2 Host network card settings.

#ip link Add link eth0 macvlan0 type Macvlan mode bridge

#ip Link Set macvlan0 up

Case 1:

The configuration file for this virtual machine is as follows:

Lxc.network.type = Macvlan

Lxc.network.macvlan.mode = Bridge

Lxc.network.flags = up

Lxc.network.link = Macvlan0

LXC.NETWORK.HWADDR = fe:e9:51:8f:88:08

Lxc.network.ipv4 = 192.168.100.2/24

Lxc.network.ipv4.gateway = 192.168.85.153

Lxc.rootfs =/home/lxc/centos-test1/rootfs

Lxc.include =/usr/share/lxc/config/centos.common.conf

Lxc.arch = x86_64

Lxc.utsname = centos-test1.synnex.org

Lxc.autodev = 1

Lxc.mount.auto = proc SYS cgroup

You should modify the network card configuration file for the virtual machine before starting the virtual machine.

# Vim Rootfs/etc/sysconfig/network-scripts/ifcfg-eth0

Change to use static Ip:bootproto=none

Host Routing settings:

#route add-net 192.168.100.0/24 Dev macvlan0

At this point, the virtual machine routes:

Route-n

Kernel IP Routing Table

Destination Gateway genmask Flags Metric Ref use Iface

0.0.0.0 192.168.85.153 0.0.0.0 UG 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 1006 0 0 eth0

192.168.85.153 0.0.0.0 255.255.255.255 UH 0 0 0 eth0

192.168.100.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

At this point the host and the virtual machine are connected.

Case 2:

The configuration file for the LXC virtual machine is as follows

Lxc.network.type = Macvlan

Lxc.network.macvlan.mode = Bridge

Lxc.network.flags = up

Lxc.network.link = Macvlan0

LXC.NETWORK.HWADDR = Fe:e4:24:fc:55:da

Lxc.rootfs =/home/lxc/centos-test2/rootfs

Lxc.include =/usr/share/lxc/config/centos.common.conf

Lxc.arch = x86_64

Lxc.utsname = centos-test2.lmy.org

Lxc.autodev = 1

Lxc.mount.auto = proc SYS cgroup

Get ip:192.168.85.228

Host Routing settings:

#route add-host 192.168.85.228 GW 192.168.85.1

Note: Although Macvlan0 is used as a virtual machine NIC, but its gateway is also 192.168.85.1, setting the host to access the virtual machine's route should also be set to the same route

At this point, the virtual machine routes

[Email protected] ~]# route-n

Kernel IP Routing Table

Destination Gateway genmask Flags Metric Ref use Iface

0.0.0.0 192.168.85.1 0.0.0.0 UG 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 1022 0 0 eth0

192.168.85.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

You can see that one more route setting will remove him

#route del-net 192.168.85.0/24 Dev eth0

The virtual machine route at this time:

# Route-n

Kernel IP Routing Table

Destination Gateway genmask Flags Metric Ref use Iface

0.0.0.0 192.168.85.1 0.0.0.0 UG 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 1022 0 0 eth0

At this point the network between the virtual machine and the host is interoperable, but the virtual machine and the external network are not yet through.

Running the LXC virtual machine on Ubuntu