Linux KVM 多宿主机的虚拟机互相访问

两台VM主机
10.0.0.202    10.0.0.203
1》 开启VT

2》 开始查看内核是否内嵌KVM
[20:10:08 root@noise ~]#egrep '(vmx|svm)' /proc/cpuinfo
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc cpuid pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch cpuid_fault invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 invpcid rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves arat flush_l1d arch_capabilities
[20:18:37 root@noise ~]#ll /dev/kvm
crw-rw---- 1 root kvm 10, 232 Nov 14 20:10 /dev/kvm


3》 开始安装工具
[19:08:14 root@noise ~]#apt install -y qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils virtinst virt-manager virt-viewer

4》开始部署KVM虚拟机

4.1》 建立raw或者qcow2文件
[19:25:33 root@noise ~]#qemu-img create -f raw /data/CentOS-7-x86_64-DVD-2009.raw 10G

4.2》上传系统安装文件镜像 - 用xftp上传镜像
[20:20:20 root@noise ~]#ll /data/CentOS-7-x86_64-DVD-2009*
-rw-r--r-- 1 libvirt-qemu kvm  4712300544 Nov 14 19:20 /data/CentOS-7-x86_64-DVD-2009.iso
-rw-r--r-- 1 libvirt-qemu kvm 10737418240 Nov 14 20:17 /data/CentOS-7-x86_64-DVD-2009.raw


4.3》 开始安装虚拟机
[19:33:17 root@noise ~]#virt-install --virt-type kvm --name Centos-7-x86_64_1 --memory 1024 --cdrom=/data/CentOS-7-x86_64-DVD-2009.iso --disk=/data/CentOS-7-x86_64-DVD-2009.raw --network network=default --graphics vnc,listen=0.0.0.0 --noautoconsole

4.4》用tightVNC查看虚拟机安装进度

5》 安装完毕，查看是否成功
[20:20:27 root@noise ~]#virsh list --all
 Id    Name                           State
----------------------------------------------------
 4     Centos-7-x86_64_1              running

6》打开x-manager配置kvm虚拟机
[20:01:19 root@noise ~]#virt-manager 

注意，需要先下载x-manager，然后xshell打开x-manager选项

6》 配置KVM虚拟机

7》 配置完毕重启虚拟机
[20:06:38 root@noise ~]#virsh shutdown Centos-7-x86_64_1
Domain Centos-7-x86_64_1 is being shutdown

[20:10:03 root@noise ~]#virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     Centos-7-x86_64_1              shut off

[20:10:05 root@noise ~]#virsh start Centos-7-x86_64_1
Domain Centos-7-x86_64_1 started

8》10.0.0.203 类似配置

9》 此时10.0.0.202里面的kvm虚拟机能ping通10.0.0.203的kvm虚拟机
10》 查看宿主机的网络状态,用的是网桥模式，绑定到eth0，此时大家都在10.0.0.0/24网段,所以都能ping通
10.0.0.202----
[20:27:01 root@noise ~]#ip addr
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:  mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:75:7d:76 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.202/24 brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe75:7d76/64 scope link 
       valid_lft forever preferred_lft forever
3: virbr0:  mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:a1:f8:3b 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:  mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000
    link/ether 52:54:00:a1:f8:3b brd ff:ff:ff:ff:ff:ff
8: macvtap0@eth0:  mtu 1500 qdisc fq_codel state UP group default qlen 500
    link/ether 52:54:00:b1:b4:97 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::5054:ff:feb1:b497/64 scope link 
       valid_lft forever preferred_lft forever

10.0.0.203 ---
[20:15:15 root@noise ~]#ip addr
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:  mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:72:d5:3a brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.203/24 brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe72:d53a/64 scope link 
       valid_lft forever preferred_lft forever
3: virbr0:  mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:21:5f:cc 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:  mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000
    link/ether 52:54:00:21:5f:cc brd ff:ff:ff:ff:ff:ff
7: macvtap0@eth0:  mtu 1500 qdisc fq_codel state UP group default qlen 500
    link/ether 52:54:00:8c:e2:d9 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::5054:ff:fe8c:e2d9/64 scope link 
       valid_lft forever preferred_lft forever