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: 
    
      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 forever2: enp2s0: 
     
       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 forever3: br0: 
      
        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 forever4: virbr0: 
       
         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 forever5: virbr0-nic: 
        
          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:ff10: vnet0: 
         
           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

• -