52 kvm及libvirt、使用virsh管理kvm虚拟机、网络虚拟化技术基础、网络名称空间netns用法详解...

柔情只为你懂 2022-01-10 23:35 1049阅读 0赞

**01kvm及libvirt**

**\[root@node1 ~\]\# yum install libvirt libvirt-client python-virtinst virt-manager virt-install -y**

**\[root@node1 ~\]\# yum -y install qemu-kvm**

**\[root@node1 ~\]\# systemctl start libvirtd.service**

**\#创建桥**

**\[root@node1 ~\]\# virsh iface-bridge eno16777736 br0 --no-stp**

**\[root@node1 ~\]\# systemctl restart network.service**

**\[root@node1 ~\]\# brctl show**

**bridge name bridge id STP enabled interfaces**

**br0 8000.000c29ba0d2f no eno16777736**

**virbr0 8000.52540067a9f3 yes virbr0-nic**

**\#创建虚拟机**

**\[root@node1 ~\]\# virt-manager**

**02使用virsh管理kvm虚拟机**

**\[root@node1 ~\]\# yum -y install virt-viewer**

**\[root@node1 ~\]\# mkdir /p\_w\_picpaths/centos -p**

**\[root@node1 ~\]\# virt-install -n centos6.7 -r 512 --vcpus=2,maxvcpus=4 --pxe --disk /p\_w\_picpaths/centos/centos6.7.qcow2,size=120,format=qcow2,bus=virtio,sparse=yes --network bridge=br0,model=virtio --force**

**\[root@node1 ~\]\# virsh list**

**Id 名称 状态**

**----------------------------------------------------**

**3 centos6.7 running**

**\[root@node1 ~\]\# virt-viewer 3**

**\#强制关机**

**\[root@node1 ~\]\# virsh destroy 1**

**\[root@node1 ~\]\# ls /etc/libvirt/qemu**

**centos6.7.xml networks**

**\#根据xml文件创建虚拟机**

**\[root@node1 ~\]\# virsh create /etc/libvirt/qemu/centos6.7.xml**

**域 centos6.7 被创建从 /etc/libvirt/qemu/centos6.7.xml**

**\#创建的虚拟机已经运行了**

**\[root@node1 ~\]\# virsh list**

**Id 名称 状态**

**----------------------------------------------------**

**2 centos6.7 running**

**\#删除虚拟机**

**\[root@node1 ~\]\# virsh undefine centos6.7 --remove-all-storage**

**域 centos6.7 已经被取消定义**

**已删除卷 'vda'(/p\_w\_picpaths/centos/centos6.7.qcow2)。**

**\[root@node1 ~\]\# mkdir /p\_w\_picpaths/cirros**

**\[root@node1 ~\]\# mv cirros-no\_cloud-0.3.0-i386-disk.img /p\_w\_picpaths/cirros/**

**\#试运行操作**

**\[root@node1 ~\]\# virt-install -n cirros -r 128 --disk /p\_w\_picpaths/cirros/cirros-no\_cloud-0.3.0-i386-disk.img --import --dry-run**

**WARNING 未检测到操作系统虚拟机性能可能会受到影响。使用 --os-variant 选项指定操作系统以获得最佳性能。**

**试运行成功完成**

**\[root@node1 ~\]\# virt-install -n cirros -r 128 --disk /p\_w\_picpaths/cirros/cirros-no\_cloud-0.3.0-i386-disk.img --import**

**\[root@node1 ~\]\# virt-install -n cirros -r 128 --vcpus=1,maxvcpus=4 --disk /p\_w\_picpaths/cirros/cirros-no\_cloud-0.3.0-i386-disk.img --network bridge=br0,model=virtio --import --serial=pty --console=pty --nographics**

**\#创建磁盘映像文件**

**\[root@node1 ~\]\# qemu-img create -f qcow2 -o size=20G,preallocation=metadata /p\_w\_picpaths/cirros/second.qcow2**

**\#查看磁盘映像文件信息**

**\[root@node1 ~\]\# qemu-img info /p\_w\_picpaths/cirros/second.qcow2**

**p\_w\_picpath: /p\_w\_picpaths/cirros/second.qcow2**

**file format: qcow2**

**virtual size: 20G (21474836480 bytes)**

**disk size: 4.1M**

**cluster\_size: 65536**

**Format specific information:**

**compat: 1.1**

**lazy refcounts: false**

**\#把新增磁盘添加到正在运行的虚拟机上**

**\[root@node1 ~\]\# virsh attach-disk 8 /p\_w\_picpaths/cirros/second.qcow2 vda --targetbus virtio**

**成功附加磁盘**

**\#拆除正在运行的虚拟机上的硬盘**

**\[root@node1 ~\]\# virsh detach-disk 8 vda**

**成功分离磁盘**

**\#向虚拟机上添加网络接口**

**\[root@node1 ~\]\# virsh attach-interface 8 bridge virbr0**

**成功附加接口**

**\#拆除虚拟机上网络接口**

**\[root@node1 ~\]\# virsh detach-interface 8 bridge --mac 52:54:00:E7:4D:25**

**成功分离接口**

**\#查看虚拟机的定义信息**

**\[root@node1 ~\]\# virsh dumpxml cirros**

**\#查看域CPU个数**

**\[root@node1 ~\]\# virsh vcpucount 8**

**最大值 配置 4**

**最大值 live 4**

**当前 配置 1**

**当前 live 1**

**\#查看域CPU信息**

**\[root@node1 ~\]\# virsh vcpuinfo 8**

**VCPU: 0**

**CPU: 1**

**状态 running**

**CPU 时间 111.0s**

**CPU关系: yyyy**

**\#配置域中vcpu**

**\[root@node1 ~\]\# virsh setvcpus 8 2**

**\[root@node1 ~\]\# virsh vcpuinfo 8**

**VCPU: 0**

**CPU: 0**

**状态 running**

**CPU 时间 111.5s**

**CPU关系: yyyy**

**VCPU: 1**

**CPU: 0**

**状态 running**

**CPU关系: yyyy**

**\#查看域磁盘位置**

**\[root@node1 ~\]\# virsh domblklist 8**

**目标 源**

**------------------------------------------------**

**hda /p\_w\_picpaths/cirros/cirros-no\_cloud-0.3.0-i386-disk.img**

**\#查看域网络信息**

**\[root@node1 ~\]\# virsh domiflist 8**

**接口 类型 源 型号 MAC**

**-------------------------------------------------------**

**vnet0 bridge br0 virtio 52:54:00:c1:01:14**

**\#查看域信息**

**\[root@node1 ~\]\# virsh dominfo 8**

**Id: 8**

**名称 cirros**

**UUID: fc2c006f-f336-47cd-a6d8-b5f474167b88**

**OS 类型 hvm**

**状态 running**

**CPU 2**

**CPU 时间 124.5s**

**最大内存 131072 KiB**

**使用的内存 131072 KiB**

**持久 是**

**自动启动 禁用**

**管理的保存 否**

**安全性模式 none**

**安全性 DOI 0**

**\#显示节点信息物理机**

**\[root@node1 ~\]\# virsh nodeinfo**

**CPU 型号 x86\_64**

**CPU 4**

**CPU 频率 2128 MHz**

**CPU socket 1**

**每个 socket 的内核数 4**

**每个内核的线程数 1**

**NUMA 单元 1**

**内存大小 8388084 KiB**

**\#显示URI**

**\[root@node1 ~\]\# virsh uri**

**qemu:///system**

**\#显示版本号**

**\[root@node1 ~\]\# virsh version**

**根据库编译libvirt 2.0.0**

**使用库libvirt 2.0.0**

**使用的 API: QEMU 2.0.0**

**运行管理程序: QEMU 1.5.3**

**\#列出接口**

**\[root@node1 ~\]\# virsh iface-list**

**名称 状态 MAC 地址**

**---------------------------------------------------**

**br0 活动 00:0c:29:ba:0d:2f**

**lo 活动 00:00:00:00:00:00**

**\#列出过滤器**

**\[root@node1 ~\]\# virsh nwfilter-list**

**UUID 名称**

**------------------------------------------------------------------**

**13c88621-6473-4883-bb5b-ea25f0b0f8db allow-arp**

**792262fd-29f0-4fd6-8ae3-f7f320774dc1 allow-dhcp**

**6175cb41-2c50-420a-b779-9bdbeaa62cb9 allow-dhcp-server**

**4ac77628-0369-48b0-8544-bd694fd12994 allow-incoming-ipv4**

**7ee5bef8-9170-4320-ba3b-bc4d6d5fe6d8 allow-ipv4**

**e712460b-3505-4ded-9b99-5ee2ea54c417 clean-traffic**

**2fea4106-6c3e-49c5-8297-871bf7656992 no-arp-ip-spoofing**

**2ce69339-59ba-4002-81fe-d650e9045927 no-arp-mac-spoofing**

**4fefe23c-b1fc-4daf-be95-4844d03ff006 no-arp-spoofing**

**7d6d1c55-d6ad-44c8-aab1-50de8988db81 no-ip-multicast**

**dfd46e5c-37a5-4465-aec9-38c3e8747d87 no-ip-spoofing**

**7f86b7e0-9873-4174-83ad-2853af8853cb no-mac-broadcast**

**c396c95a-e1a4-44ad-95a2-c1c76bcca423 no-mac-spoofing**

**d6681b9e-cfc5-483e-9f71-170cb4cecf13 no-other-l2-traffic**

**c7031d28-5e60-4345-ac88-a9b72acc48fb no-other-rarp-traffic**

**37140bfc-595f-43f6-a831-fe223106794c qemu-announce-self**

**26522e96-db13-43ad-9bdb-6c29fbcfb9b6 qemu-announce-self-rarp**

**03网络虚拟化技术基础**

**\#查看802.1q模块信息**

**\[root@node1 ~\]\# modinfo 8021q**

**filename: /lib/modules/3.10.0-327.el7.x86\_64/kernel/net/8021q/8021q.ko**

**version: 1.8**

**license: GPL**

**alias: rtnl-link-vlan**

**rhelversion: 7.2**

**srcversion: 2E63BD725D9DC11C7DA6190**

**depends: mrp,garp**

**intree: Y**

**vermagic: 3.10.0-327.el7.x86\_64 SMP mod\_unload modversions**

**signer: CentOS Linux kernel signing key**

**sig\_key: 79:AD:88:6A:11:3C:A0:22:35:26:33:6C:0F:82:5B:8A:94:29:6A:B3**

**sig\_hashalgo: sha256**

**\#加载模块**

**\[root@node1 ~\]\# modprobe 8021q**

**\[root@node1 ~\]\# yum install vconfig**

**04网络名称空间netns用法详解**

**配置环境**

**node1:192.168.1.131CentOS Linux release 7.2**

**node2:192.168.1.132CentOS Linux release 7.2**

**\[root@node1 ~\]\# ip netns add r1**

**\[root@node1 ~\]\# ip netns add r2**

**\[root@node1 ~\]\# ip netns list**

**r2**

**r1**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig -a**

**lo: flags=8<LOOPBACK> mtu 65536**

**loop txqueuelen 0 (Local Loopback)**

**RX packets 0 bytes 0 (0.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 0 bytes 0 (0.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**\[root@node1 ~\]\# ip netns exec r1 route -n**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig lo 127.0.0.1/8 up**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig**

**lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536**

**inet 127.0.0.1 netmask 255.0.0.0**

**inet6 ::1 prefixlen 128 scopeid 0x10<host>**

**loop txqueuelen 0 (Local Loopback)**

**RX packets 0 bytes 0 (0.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 0 bytes 0 (0.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**\[root@node1 ~\]\# ip netns exec r2 ifconfig -a**

**lo: flags=8<LOOPBACK> mtu 65536**

**loop txqueuelen 0 (Local Loopback)**

**RX packets 0 bytes 0 (0.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 0 bytes 0 (0.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**\#查看R1 iptables规则**

**\[root@node1 ~\]\# ip netns exec r1 iptables -L -n**

**Chain INPUT (policy ACCEPT)**

**target prot opt source destination**

**Chain FORWARD (policy ACCEPT)**

**target prot opt source destination**

**Chain OUTPUT (policy ACCEPT)**

**target prot opt source destination**

**\#创建物理桥**

**\[root@node1 ~\]\# brctl addbr br-ex**

**\[root@node1 ~\]\# ip link set br-ex up**

**\[root@node1 ~\]\# ip addr del 192.168.1.131/24 dev eno16777736;ip addr add 192.168.1.131/24 dev br-ex;brctl addif br-ex eno16777736**

**\#创建内部桥**

**\[root@node1 ~\]\# brctl addbr br-in**

**\[root@node1 ~\]\# ip link set br-in up**

**\#开启路由转发功能**

**\[root@node1 ~\]\# vim /etc/sysctl.conf**

**添加**

**net.ipv4.ip\_forward = 1**

**\[root@node1 ~\]\# sysctl -p**

**net.ipv4.ip\_forward = 1**

**\#创建一对虚拟网卡**

**\[root@node1 ~\]\# ip link add veth1.1 type veth peer name veth1.2**

**\[root@node1 ~\]\# ip link show**

**1: lo: <LOOPBACK,UP,LOWER\_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT**

**link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00**

**2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-ex state UP mode DEFAULT qlen 1000**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo\_fast master virbr0 state DOWN mode DEFAULT qlen 500**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**5: br-ex: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**6: br-in: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT**

**link/ether ca:89:b9:dc:cd:7d brd ff:ff:ff:ff:ff:ff**

**7: veth1.2@veth1.1: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000**

**link/ether c6:66:c7:32:06:e1 brd ff:ff:ff:ff:ff:ff**

**8: veth1.1@veth1.2: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000**

**link/ether 5e:58:78:10:ed:a0 brd ff:ff:ff:ff:ff:ff**

**\[root@node1 ~\]\# ip link set veth1.1 netns r1**

**\[root@node1 ~\]\# ip link set veth1.2 netns r2**

**\[root@node1 ~\]\# ip link show**

**1: lo: <LOOPBACK,UP,LOWER\_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT**

**link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00**

**2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-ex state UP mode DEFAULT qlen 1000**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo\_fast master virbr0 state DOWN mode DEFAULT qlen 500**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**5: br-ex: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**6: br-in: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT**

**link/ether ca:89:b9:dc:cd:7d brd ff:ff:ff:ff:ff:ff**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig -a**

**lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536**

**inet 127.0.0.1 netmask 255.0.0.0**

**inet6 ::1 prefixlen 128 scopeid 0x10<host>**

**loop txqueuelen 0 (Local Loopback)**

**RX packets 0 bytes 0 (0.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 0 bytes 0 (0.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**veth1.1: flags=4098<BROADCAST,MULTICAST> mtu 1500**

**ether 5e:58:78:10:ed:a0 txqueuelen 1000 (Ethernet)**

**RX packets 0 bytes 0 (0.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 0 bytes 0 (0.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**\[root@node1 ~\]\# ip netns exec r2 ifconfig -a**

**lo: flags=8<LOOPBACK> mtu 65536**

**loop txqueuelen 0 (Local Loopback)**

**RX packets 0 bytes 0 (0.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 0 bytes 0 (0.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**veth1.2: flags=4098<BROADCAST,MULTICAST> mtu 1500**

**ether c6:66:c7:32:06:e1 txqueuelen 1000 (Ethernet)**

**RX packets 0 bytes 0 (0.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 0 bytes 0 (0.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**\#更改R1网卡显示名**

**\[root@node1 ~\]\# ip netns exec r1 ip link set veth1.1 name eth0**

**\[root@node1 ~\]\# ip netns exec r1 ip link show**

**1: lo: <LOOPBACK,UP,LOWER\_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT**

**link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00**

**8: eth0@if7: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000**

**link/ether 5e:58:78:10:ed:a0 brd ff:ff:ff:ff:ff:ff link-netnsid 1**

**\#更改R2网卡显示名**

**\[root@node1 ~\]\# ip netns exec r2 ip link set veth1.2 name eth0**

**\[root@node1 ~\]\# ip netns exec r1 ip link show**

**1: lo: <LOOPBACK,UP,LOWER\_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT**

**link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00**

**8: eth0@if7: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000**

**link/ether 5e:58:78:10:ed:a0 brd ff:ff:ff:ff:ff:ff link-netnsid 1**

**\#配置R1、R2的IP**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig eth0 10.0.1.1/24 up**

**\[root@node1 ~\]\# ip netns exec r2 ifconfig eth0 10.0.1.2/24 up**

**\#测试R1、R2联通性**

**\[root@node1 ~\]\# ip netns exec r1 ping 10.0.1.1**

**PING 10.0.1.1 (10.0.1.1) 56(84) bytes of data.**

**64 bytes from 10.0.1.1: icmp\_seq=1 ttl=64 time=0.314 ms**

**64 bytes from 10.0.1.1: icmp\_seq=2 ttl=64 time=0.057 ms**

**^C**

**--- 10.0.1.1 ping statistics ---**

**2 packets transmitted, 2 received, 0% packet loss, time 1000ms**

**rtt min/avg/max/mdev = 0.057/0.185/0.314/0.129 ms**

**\[root@node1 ~\]\# ip netns exec r1 ping 10.0.1.2**

**PING 10.0.1.2 (10.0.1.2) 56(84) bytes of data.**

**64 bytes from 10.0.1.2: icmp\_seq=1 ttl=64 time=0.191 ms**

**64 bytes from 10.0.1.2: icmp\_seq=2 ttl=64 time=0.072 ms**

**\[root@node1 ~\]\# route add default gw 192.168.1.254**

**\[root@node1 ~\]\# yum -y install qemu-kvm**

**\[root@node1 ~\]\# modprobe kvm**

**\[root@node1 ~\]\# mkdir -p /p\_w\_picpaths/cirros**

**\[root@node1 ~\]\# cd /p\_w\_picpaths/cirros/**

**\[root@node1 cirros\]\# ls**

**cirros-no\_cloud-0.3.0-i386-disk.img**

**\[root@node1 cirros\]\# cp cirros-no\_cloud-0.3.0-i386-disk.img test1.qcow2**

**\[root@node1 cirros\]\# cp cirros-no\_cloud-0.3.0-i386-disk.img test2.qcow2**

**\[root@node1 cirros\]\# cd**

**\[root@node1 ~\]\# vim /etc/qemu-ifup**

**\#!/bin/bash**

**\#**

**bridge=br-in**

**if \[ -n "$1" \];then**

**ip link set $1 up**

**brctl addif $bridge $1**

**\[ $? -eq 0 \] && exit 0 || exit 1**

**else**

**echo "Error: no interface specified."**

**exit 1**

**fi**

**\[root@node1 ~\]\# chmod +x /etc/qemu-ifup**

**\[root@node1 ~\]\# bash -n /etc/qemu-ifup**

**\[root@node1 ~\]\# ln -s /usr/libexec/qemu-kvm /usr/bin/**

**\#安装第一个虚拟机**

**\[root@node1 ~\]\# qemu-kvm -m 128 -smp 1 -name vm1 -drive file=/p\_w\_picpaths/cirros/test1.qcow2,if=virtio,media=disk -net nic,macaddr=52:54:00:aa:bb:cc -net tap,ifname=vif1.0,script=/etc/qemu-ifup --nographic**

**\#安装第二个虚拟机**

**\[root@node1 ~\]\# qemu-kvm -m 128 -smp 1 -name vm2 -drive file=/p\_w\_picpaths/cirros/test2.qcow2,if=virtio,media=disk -net nic,macaddr=52:54:00:aa:bb:dd -net tap,ifname=vif2.0,script=/etc/qemu-ifup --nographic**

**\[root@node1 ~\]\# brctl show**

**bridge name bridge id STP enabled interfaces**

**br-ex 8000.000c295027c4 no eno16777736**

**br-in 8000.1a39688cf1ea no vif1.0**

**vif2.0**

**\[root@node1 ~\]\# ip netns delete r1**

**\[root@node1 ~\]\# ip netns delete r2**

**\[root@node1 ~\]\# ip netns list**

**\[root@node1 ~\]\# ip netns add r1**

**\[root@node1 ~\]\# ip link show**

**1: lo: <LOOPBACK,UP,LOWER\_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT**

**link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00**

**2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-ex state UP mode DEFAULT qlen 1000**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo\_fast master virbr0 state DOWN mode DEFAULT qlen 500**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**5: br-ex: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**6: br-in: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT**

**link/ether 1a:39:68:8c:f1:ea brd ff:ff:ff:ff:ff:ff**

**10: vif1.0: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-in state UNKNOWN mode DEFAULT qlen 500**

**link/ether 6a:02:16:30:9c:82 brd ff:ff:ff:ff:ff:ff**

**11: vif2.0: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-in state UNKNOWN mode DEFAULT qlen 500**

**link/ether 1a:39:68:8c:f1:ea brd ff:ff:ff:ff:ff:ff**

**\[root@node1 ~\]\# ip link add rinr type veth peer name rins**

**\[root@node1 ~\]\# ip link show**

**1: lo: <LOOPBACK,UP,LOWER\_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT**

**link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00**

**2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-ex state UP mode DEFAULT qlen 1000**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo\_fast master virbr0 state DOWN mode DEFAULT qlen 500**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**5: br-ex: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**6: br-in: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT**

**link/ether 1a:39:68:8c:f1:ea brd ff:ff:ff:ff:ff:ff**

**10: vif1.0: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-in state UNKNOWN mode DEFAULT qlen 500**

**link/ether 6a:02:16:30:9c:82 brd ff:ff:ff:ff:ff:ff**

**11: vif2.0: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-in state UNKNOWN mode DEFAULT qlen 500**

**link/ether 1a:39:68:8c:f1:ea brd ff:ff:ff:ff:ff:ff**

**12: rins@rinr: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000**

**link/ether 7e:d4:16:e7:22:cc brd ff:ff:ff:ff:ff:ff**

**13: rinr@rins: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000**

**link/ether da:cf:c3:b5:7b:8a brd ff:ff:ff:ff:ff:ff**

**\[root@node1 ~\]\# ip link set rinr up**

**\[root@node1 ~\]\# ip link set rins up**

**\[root@node1 ~\]\# brctl addif br-in rins**

**\[root@node1 ~\]\# brctl show**

**bridge name bridge id STP enabled interfaces**

**br-ex 8000.000c295027c4 no eno16777736**

**br-in 8000.1a39688cf1ea no rins**

**vif1.0**

**vif2.0**

**\[root@node1 ~\]\# ip link set rinr netns r1**

**\#R1网卡改名**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig -a**

**lo: flags=8<LOOPBACK> mtu 65536**

**loop txqueuelen 0 (Local Loopback)**

**RX packets 0 bytes 0 (0.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 0 bytes 0 (0.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**rinr: flags=4098<BROADCAST,MULTICAST> mtu 1500**

**ether da:cf:c3:b5:7b:8a txqueuelen 1000 (Ethernet)**

**RX packets 8 bytes 648 (648.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 8 bytes 648 (648.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**\[root@node1 ~\]\# ip netns exec r1 ip link set rinr name eth0**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig -a**

**eth0: flags=4098<BROADCAST,MULTICAST> mtu 1500**

**ether da:cf:c3:b5:7b:8a txqueuelen 1000 (Ethernet)**

**RX packets 8 bytes 648 (648.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 8 bytes 648 (648.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**lo: flags=8<LOOPBACK> mtu 65536**

**loop txqueuelen 0 (Local Loopback)**

**RX packets 0 bytes 0 (0.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 0 bytes 0 (0.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**\[root@node1 ~\]\# ip netns exec r1 ip link set eth0 up**

**\[root@node1 ~\]\# ip netns exec r1 ip link show**

**1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT**

**link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00**

**13: eth0@if12: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast state UP mode DEFAULT qlen 1000**

**link/ether da:cf:c3:b5:7b:8a brd ff:ff:ff:ff:ff:ff link-netnsid 0**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig eth0 10.0.1.254/24 up**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig**

**eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500**

**inet 10.0.1.254 netmask 255.255.255.0 broadcast 10.0.1.255**

**inet6 fe80::d8cf:c3ff:feb5:7b8a prefixlen 64 scopeid 0x20<link>**

**ether da:cf:c3:b5:7b:8a txqueuelen 1000 (Ethernet)**

**RX packets 8 bytes 648 (648.0 B)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 16 bytes 1296 (1.2 KiB)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**\#配置第一台虚拟机IP**

**$ sudo su -**

**\# ifconfig eth0 10.0.1.1/24 up**

**\# ping 10.0.1.254**

**PING 10.0.1.254 (10.0.1.254): 56 data bytes**

**64 bytes from 10.0.1.254: seq=0 ttl=64 time=159.302 ms**

**64 bytes from 10.0.1.254: seq=1 ttl=64 time=5.182 ms**

**\# route add default gw 10.0.1.254**

**\#配置第二台虚拟机IP**

**$ sudo su -**

**\# ifconfig eth0 10.0.1.2/24 up**

**\# ping 10.0.1.254**

**PING 10.0.1.254 (10.0.1.254): 56 data bytes**

**64 bytes from 10.0.1.254: seq=0 ttl=64 time=11.109 ms**

**64 bytes from 10.0.1.254: seq=1 ttl=64 time=4.452 ms**

**--- 10.0.1.254 ping statistics ---**

**2 packets transmitted, 2 packets received, 0% packet loss**

**round-trip min/avg/max = 4.452/7.780/11.109 ms**

**\# route add default gw 10.0.1.254**

**\[root@node1 ~\]\# ip link add rexr type veth peer name rexs**

**\[root@node1 ~\]\# ip link show**

**1: lo: <LOOPBACK,UP,LOWER\_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT**

**link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00**

**2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-ex state UP mode DEFAULT qlen 1000**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo\_fast master virbr0 state DOWN mode DEFAULT qlen 500**

**link/ether 52:54:00:43:0d:84 brd ff:ff:ff:ff:ff:ff**

**5: br-ex: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT**

**link/ether 00:0c:29:50:27:c4 brd ff:ff:ff:ff:ff:ff**

**6: br-in: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT**

**link/ether 1a:39:68:8c:f1:ea brd ff:ff:ff:ff:ff:ff**

**10: vif1.0: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-in state UNKNOWN mode DEFAULT qlen 500**

**link/ether 6a:02:16:30:9c:82 brd ff:ff:ff:ff:ff:ff**

**11: vif2.0: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-in state UNKNOWN mode DEFAULT qlen 500**

**link/ether 1a:39:68:8c:f1:ea brd ff:ff:ff:ff:ff:ff**

**12: rins@if13: <BROADCAST,MULTICAST,UP,LOWER\_UP> mtu 1500 qdisc pfifo\_fast master br-in state UP mode DEFAULT qlen 1000**

**link/ether 7e:d4:16:e7:22:cc brd ff:ff:ff:ff:ff:ff link-netnsid 0**

**14: rexs@rexr: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000**

**link/ether c2:6a:a0:96:0e:27 brd ff:ff:ff:ff:ff:ff**

**15: rexr@rexs: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000**

**link/ether ce:6d:e3:9e:d1:1c brd ff:ff:ff:ff:ff:ff**

**\[root@node1 ~\]\# brctl addif br-ex rexs**

**\[root@node1 ~\]\# ip link set rexs up**

**\[root@node1 ~\]\# brctl show**

**bridge name bridge id STP enabled interfaces**

**br-ex 8000.000c295027c4 no eno16777736**

**rexs**

**br-in 8000.1a39688cf1ea no rins**

**vif1.0**

**vif2.0**

**\[root@node1 ~\]\# ip link set rexr netns r1**

**\[root@node1 ~\]\# ip netns exec r1 ip link set rexr name eth1**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig eth1 192.168.1.134/24 up**

**\[root@node1 ~\]\# ip netns exec r1 ifconfig**

**eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500**

**inet 10.0.1.254 netmask 255.255.255.0 broadcast 10.0.1.255**

**inet6 fe80::d8cf:c3ff:feb5:7b8a prefixlen 64 scopeid 0x20<link>**

**ether da:cf:c3:b5:7b:8a txqueuelen 1000 (Ethernet)**

**RX packets 27 bytes 2174 (2.1 KiB)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 32 bytes 2696 (2.6 KiB)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500**

**inet 192.168.1.134 netmask 255.255.255.0 broadcast 192.168.1.255**

**inet6 fe80::cc6d:e3ff:fe9e:d11c prefixlen 64 scopeid 0x20<link>**

**ether ce:6d:e3:9e:d1:1c txqueuelen 1000 (Ethernet)**

**RX packets 33 bytes 4560 (4.4 KiB)**

**RX errors 0 dropped 0 overruns 0 frame 0**

**TX packets 8 bytes 648 (648.0 B)**

**TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0**

**\[root@node1 ~\]\# ip netns exec r1 ping 192.168.1.1**

**PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.**

**64 bytes from 192.168.1.1: icmp\_seq=1 ttl=64 time=1.72 ms**

**64 bytes from 192.168.1.1: icmp\_seq=2 ttl=64 time=0.453 ms**

**\#测试虚拟机网络**

**\[root@node1 ~\]\# tcpdump -i vif1.0 -nn icmp**

**tcpdump: WARNING: vif1.0: no IPv4 address assigned**

**tcpdump: verbose output suppressed, use -v or -vv for full protocol decode**

**listening on vif1.0, link-type EN10MB (Ethernet), capture size 65535 bytes**

**09:43:35.448999 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 186, length 64**

**09:43:36.456217 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 187, length 64**

**^C**

**2 packets captured**

**2 packets received by filter**

**0 packets dropped by kernel**

**\[root@node1 ~\]\# tcpdump -i rins -nn icmp**

**tcpdump: WARNING: rins: no IPv4 address assigned**

**tcpdump: verbose output suppressed, use -v or -vv for full protocol decode**

**listening on rins, link-type EN10MB (Ethernet), capture size 65535 bytes**

**09:43:06.250500 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 157, length 64**

**09:43:07.257803 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 158, length 64**

**09:43:08.265838 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 159, length 64**

**^C**

**3 packets captured**

**3 packets received by filter**

**0 packets dropped by kernel**

**\[root@node1 ~\]\# ip netns exec r1 tcpdump -i eth0 -nn icmp**

**tcpdump: verbose output suppressed, use -v or -vv for full protocol decode**

**listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes**

**09:45:20.239901 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 290, length 64**

**09:45:21.246984 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 291, length 64**

**09:45:22.254115 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 292, length 64**

**^C**

**3 packets captured**

**3 packets received by filter**

**0 packets dropped by kernel**

**\[root@node1 ~\]\# ip netns exec r1 tcpdump -i eth1 -nn icmp**

**tcpdump: verbose output suppressed, use -v or -vv for full protocol decode**

**listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes**

**09:46:18.629898 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 348, length 64**

**09:46:19.637394 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 349, length 64**

**09:46:20.644763 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 43520, seq 350, length 64**

**^C**

**3 packets captured**

**3 packets received by filter**

**0 packets dropped by kernel**

**\#从192.168.1.1上抓包**

**\[root@DNS-Server ~\]\# tcpdump -i eth0 -nn icmp**

**tcpdump: verbose output suppressed, use -v or -vv for full protocol decode**

**listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes**

**09:53:52.872389 IP 192.168.1.1 > 114.114.114.114: ICMP 192.168.1.1 udp port 16588 unreachable, length 66**

**09:53:52.893624 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 44288, seq 5, length 64**

**09:53:52.893646 IP 192.168.1.1 > 10.0.1.1: ICMP echo reply, id 44288, seq 5, length 64**

**09:53:53.901275 IP 10.0.1.1 > 192.168.1.1: ICMP echo request, id 44288, seq 6, length 64**

**09:53:53.901299 IP 192.168.1.1 > 10.0.1.1: ICMP echo reply, id 44288, seq 6, length 64**

**^C**

**5 packets captured**

**5 packets received by filter**

**0 packets dropped by kernel**

**\#在R1上添加iptables NAT路由转发**

**\[root@node1 ~\]\# ip netns exec r1 iptables -t nat -A POSTROUTING -s 10.0.1.0/24 ! -d 10.0.1.0/24 -j SNAT --to-source 192.168.1.134\[root@node1 ~\]\# ip netns exec r1 iptables -t nat -L -n**

**Chain PREROUTING (policy ACCEPT)**

**target prot opt source destination**

**Chain INPUT (policy ACCEPT)**

**target prot opt source destination**

**Chain OUTPUT (policy ACCEPT)**

**target prot opt source destination**

**Chain POSTROUTING (policy ACCEPT)**

**target prot opt source destination**

**SNAT all -- 10.0.1.0/24 !10.0.1.0/24 to:192.168.1.134**

**测试网络成功**

**再次抓包**

**\[root@node1 ~\]\# tcpdump -i rins -nn icmp**

**tcpdump: WARNING: rins: no IPv4 address assigned**

**tcpdump: verbose output suppressed, use -v or -vv for full protocol decode**

**listening on rins, link-type EN10MB (Ethernet), capture size 65535 bytes**

**10:00:11.768476 IP 10.0.1.1 > 192.168.1.132: ICMP echo request, id 45312, seq 5, length 64**

**10:00:11.769866 IP 192.168.1.132 > 10.0.1.1: ICMP echo reply, id 45312, seq 5, length 64**

**10:00:12.781633 IP 10.0.1.1 > 192.168.1.132: ICMP echo request, id 45312, seq 6, length 64**

**10:00:12.782421 IP 192.168.1.132 > 10.0.1.1: ICMP echo reply, id 45312, seq 6, length 64**

**^C**

**4 packets captured**

**4 packets received by filter**

**0 packets dropped by kernel**

**\#在R1上配置dhcp**

**\[root@node1 ~\]\# ip netns exec r1 dnsmasq --dhcp-range 10.0.1.100,10.0.1.120**

**\#虚拟机自动获得IP地址**

**\# udhcpc -R**

**udhcpc (v1.18.5) started**

**Sending discover...**

**Sending select for 10.0.1.120...**

**Lease of 10.0.1.120 obtained, lease time 3600**

**deleting routers**

**route: SIOCDELRT: No such process**

**adding dns 10.0.1.254**

**\# ifconfig**

**eth0 Link encap:Ethernet HWaddr 52:54:00:AA:BB:DD**

**inet addr:10.0.1.120 Bcast:10.0.1.255 Mask:255.255.255.0**

**inet6 addr: fe80::5054:ff:feaa:bbdd/64 Scope:Link**

**UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1**

**RX packets:29 errors:0 dropped:0 overruns:0 frame:0**

**TX packets:32 errors:0 dropped:0 overruns:0 carrier:0**

**collisions:0 txqueuelen:1000**

**RX bytes:2838 (2.7 KiB) TX bytes:3476 (3.3 KiB)**

**lo Link encap:Local Loopback**

**inet addr:127.0.0.1 Mask:255.0.0.0**

**inet6 addr: ::1/128 Scope:Host**

**UP LOOPBACK RUNNING MTU:16436 Metric:1**

**RX packets:0 errors:0 dropped:0 overruns:0 frame:0**

**TX packets:0 errors:0 dropped:0 overruns:0 carrier:0**

**collisions:0 txqueuelen:0**

**RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)**

**\# route -n**

**Kernel IP routing table**

**Destination Gateway Genmask Flags Metric Ref Use Iface**

**0.0.0.0 10.0.1.254 0.0.0.0 UG 0 0 0 eth0**

**10.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0**

**\[root@node1 ~\]\# ip netns exec r1 killall dnsmasq**

**\[root@node1 ~\]\# ip netns exec r1 dnsmasq -F 10.0.1.151,10.0.1.160 --dhcp-option=option:router,10.0.1.254**

**\# udhcpc -R**

**udhcpc (v1.18.5) started**

**Sending discover...**

**Sending select for 10.0.1.158...**

**Lease of 10.0.1.158 obtained, lease time 3600**

**deleting routers**

**route: SIOCDELRT: No such process**

**adding dns 10.0.1.254**

**\# route -n**

**Kernel IP routing table**

**Destination Gateway Genmask Flags Metric Ref Use Iface**

**0.0.0.0 10.0.1.254 0.0.0.0 UG 0 0 0 eth0**

**10.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0**

转载于:https://blog.51cto.com/sihua/1887978

52 kvm及libvirt、使用virsh管理kvm虚拟机、网络虚拟化技术基础、网络名称空间netns用法详解...

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