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This article mainly explains "how to create a virtual machine," interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let Xiaobian take you to learn "how to create a virtual machine"!

Add Bridge Device Files

[devops@192 ~]$ touch /etc/sysconfig/network-scripts/ifcfg-br0

configure bridge

[devops@192 ~]$ cat /etc/sysconfig/network-scripts/ifcfg-br0

TYPE=Bridge

BOOTPROTO=static

IPADDR=192.168.1.10

PREFIX=24

GATEWAY=192.168.1.1

DNS1=192.168.1.1

NM_CONTROLLED=no

DEFROUTE=yes

PEERDNS=yes

PEERROUTES=yes

IPV4_FAILURE_FATAL=no

DEVICE=br0

ONBOOT=yes

[devops@192 ~]$

Attach the network card to the bridge

Comment out the em1 NIC IP address configuration and add BRIDGE=br0.

[devops@192 ~]$ cat /etc/sysconfig/network-scripts/ifcfg-em1

TYPE=Ethernet

PROXY_METHOD=none

BROWSER_ONLY=no

DEFROUTE=yes

IPV4_FAILURE_FATAL=no

IPV6INIT=yes

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_FAILURE_FATAL=no

IPV6_ADDR_GEN_MODE=stable-privacy

IPV6_PRIVACY=no

NAME=em1

UUID=48f1a196-a6ff-4966-8b93-fb0d7b707e47

DEVICE=em1

ONBOOT=yes

#BOOTPROTO=static

#IPADDR=192.168.1.10

#PREFIX=24

#GATEWAY=192.168.1.1

#DNS1=192.168.1.1

NM_CONTROLLED=no

#BRIDGE=br0

[devops@192 ~]$

View current host routes and bridge interfaces

[devops@192 ~]$ route -v

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

default 192.168.1.1 0.0.0.0 UG 0 0 0 br0

link-local 0.0.0.0 255.255.0.0 U 1002 0 0 em1

link-local 0.0.0.0 255.255.0.0 U 1004 0 0 br0

192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 br0

192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0

[devops@192 ~]$

[devops@192 ~]$

[devops@192 ~]$ brctl show

bridge name bridge id STP enabled interfaces

br0 8000.1866daa0cb22 no em1

virbr0 8000.5254002a0526 yes virbr0-nic

[devops@192 ~]$

Restart network services

sudo systemctl restart network

Failed to start LSB: Bring up/down networking. You need to check whether the network interface file defined under/etc/sysconfig/network-scripts/has a problem. I have dual network cards here, one of which has a configuration problem, resulting in network service startup failure.

Create virtual machines using br0

With the bridge br0 above, we can create three virtual machines using bridge br0 in minutes with the following command:

ansible-playbook ./ virt-infra.yml \

--limit kvmhost,k8shosts \

-e virt_infra_root_password=password \

-e virt_infra_disk_size=100 \

-e virt_infra_ram=4096 \

-e virt_infra_ram_max=8192 \

-e virt_infra_cpus=8 \

-e virt_infra_cpus_max=16 \

-e '{ "virt_infra_networks": [{ "name": "br0", "type": "bridge" }] }' \

-e virt_infra_state=running

Log in to the created k8s_host virtual machine and ping the local area network and the internet network are open, proving that the br0 bridge works normally.

In the future, we can use these virtual machines to toss around the K8S.

At this point, I believe everyone has a deeper understanding of "how to create virtual machines," so let's actually operate them! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!

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