简明扼要kvm安装

本来打算使用ESXi进行虚拟机的创建和管理，公司只给了一台台式机进行部署，找了好几个版本，台式机电脑cpu有点老，加上机器是个组装机。虽然支持虚拟化，但是Esxi死活装不上，总是卡在O.E.M。正好机器没有什么用途，并且机器系统是新装的CentOS7.4，所以直接转向KVM。

kvm部署

必要条件：

• cpu支持虚拟化：

  命令 egrep '(vmx|svm)' /proc/cpuinfo
  查看cpu信息包含vmx或者svm表示支持虚拟化

• 关闭SELinux：

  sed -i 7's/enforcing/disabled/' /etc/sysconfig/seliunx

安装步骤：

• 安装epel源： yum -y install epel-release net-tools
• 安装kvm和依赖：yum -y install qemu-kvm libvirt virt-install bridge-utils
• 命令lsmod | grep kvm用来检测是否安装成功

• • 新建桥接网卡：

  • 备份当前网卡文件ifcfg-enp2s0，备份文件不能存在/etc/sysconfig/network-scripts/目录和其子目录下。

  • 新建网卡ifcfg-enp2s0，并填入内容：
    
TYPE=Ethernet
DEFROUTE=yes
NAME=enp2s0
DEVICE=enp2s0
ONBOOT=yes
BRIDGE=br0
BOOTPROTO=none
IPV6INIT=no
NM_CONTROLLED=no

  • 新建网卡文件ifcfg-br0,并定义网卡类型为桥接
    
ifcfg-br0
BOOTPROTO=static
DEVICE=br0
TYPE=Bridge
NM_CONTROLLED=no
IPADDR=192.168.100.50
NETMASK=255.255.255.0
GATEWAY=192.168.100.1
DNS1=202.106.0.20
DNS2=8.8.8.8

• 重启网络服务：systemctl restart network并查看一下网络:ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000
    link/ether 00:e0:4c:31:21:0e brd ff:ff:ff:ff:ff:ff
    inet6 fe80::2e0:4cff:fe31:210e/64 scope link 
       valid_lft forever preferred_lft forever
3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
    link/ether 00:e0:4c:31:21:0e brd ff:ff:ff:ff:ff:ff
    inet 192.168.100.50/24 brd 192.168.100.255 scope global br0
       valid_lft forever preferred_lft forever
    inet6 fe80::2e0:4cff:fe31:210e/64 scope link 
       valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000
    link/ether 52:54:00:3d:db:16 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
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000
    link/ether 52:54:00:3d:db:16 brd ff:ff:ff:ff:ff:ff
10: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN qlen 1000
    link/ether fe:54:00:b8:26:dc brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fc54:ff:feb8:26dc/64 scope link 
       valid_lft forever preferred_lft forever

• 开启kvm：systemctl start libvirtd
• kvm开机自启：systemctl enable libvirtd
• 查看kvm状态：systemctl status libvirtd

● libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2018-04-13 18:28:31 CST; 6min ago
     Docs: man:libvirtd(8)
           http://libvirt.org
 Main PID: 1223 (libvirtd)
   CGroup: /system.slice/libvirtd.service
           ├─1223 /usr/sbin/libvirtd
           ├─1722 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
           └─1723 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper

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