Install kvm on centos7

Install kvm on centos7

Since centos 7 has changed a lot from the previous version, we have tested the installation and Setup of kvm in centos 7 environment. The details are as follows.

1. Install kvm Software

Since you have installed and summarized kvm in detail before, the following steps are listed here:

1. [Root @ 361way ~] # Yum-y install qemu-kvm libvirt virt-install bridge-utils
2. [Root @ 361way ~] # Lsmod | grep kvm # make sure modules are loaded
3. Kvm 441119 0
4. [Root @ 361way ~] # Systemctl start libvirtd
5. [Root @ 361way ~] # Systemctl enable libvirtd

Note: The Service Management Mode on centos7 is changed to systemctl.

2. Configure Nic bridging

By default, eth0 and eth1 are no longer installed on centos 7. The first Nic installed on my pc server is changed to enp3s0. The modification steps are no different from those on centos 6, as shown below:

1. [Root @ 361way ~] # Cd/etc/sysconfig/network-scripts/
2. [Root @ 361way network-scripts] # cat ifcfg-br0
3. TYPE = Bridge
4. BOOTPROTO = none
5. DEVICE = br0
6. ONBOOT = yes
7. IPADDR0 = 192.168.0.102
8. PREFIX0 = 24
9. GATEWAY0 = 192.168.0.1
10. [Root @ 361way network-scripts] # cat ifcfg-enp3s0
11. DEVICE = enp3s0
12. TYPE = Ethernet
13. ONBOOT = yes
14. BRIDGE = br0
15. [Root @ 361way ~] Reboot
16. [Root @ 361way network-scripts] # ifconfig
17. Br0: flags = 4163 Mtu 1500
18. Inet 192.168.0.102 netmask 255.255.255.0 broadcast 192.168.0.255
19. Inet6 fe80: 7a24: afff: fe46: ca60 prefixlen 64 scopeid 0x20
20. Ether 78: 24: af: 46: ca: 60 txqueuelen 0 (Ethernet)
21. RX packets 129 bytes 14676 (14.3 KiB)
22. RX errors 0 dropped 0 overruns 0 frame 0
23. TX packets 148 bytes 21994 (21.4 KiB)
24. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
25. Enp3s0. flags = 4163 Mtu 1500
26. Ether 78: 24: af: 46: ca: 60 txqueuelen 1000 (Ethernet)
27. RX packets 129 bytes 16482 (16.0 KiB)
28. RX errors 0 dropped 0 overruns 0 frame 0
29. TX packets 148 bytes 21994 (21.4 KiB)
30. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
31. Lo: flags = 73 Mtu 65536
32. Inet 127.0.0.1 netmask 255.0.0.0
33. Inet6: 1 prefixlen 128 scopeid 0x10
34. Loop txqueuelen 0 (Local Loopback)
35. RX packets 9 bytes 728 (728.0 B)
36. RX errors 0 dropped 0 overruns 0 frame 0
37. TX packets 9 bytes 728 (728.0 B)
38. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
39. Virbr0: flags = 4099 Mtu 1500
40. Inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
41. Ether a6: 88: 9f: 14: b2: 66 txqueuelen 0 (Ethernet)
42. RX packets 0 bytes 0 (0.0 B)
43. RX errors 0 dropped 0 overruns 0 frame 0
44. TX packets 1 bytes 90 (90.0 B)
45. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
46. [Root @ 361way network-scripts] # ip add show
47. 1: lo: Mtu 65536 qdisc noqueue state UNKNOWN
48. Link/loopback 00: 00: 00: 00: 00: 00 brd 00: 00: 00: 00: 00: 00
49. Inet 127.0.0.1/8 scope host lo
50. Valid_lft forever preferred_lft forever
51. Inet6: 1/128 scope host
52. Valid_lft forever preferred_lft forever
53. 2: enp3s0: Mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000
54. Link/ether 78: 24: af: 46: ca: 60 brd ff: ff
55. 3: br0: Mtu 1500 qdisc noqueue state UP
56. Link/ether 78: 24: af: 46: ca: 60 brd ff: ff
57. Inet 192.168.0.102/24 brd 192.168.0.255 scope global br0
58. Valid_lft forever preferred_lft forever
59. Inet6 fe80: 7a24: afff: fe46: ca60/64 scope link
60. Valid_lft forever preferred_lft forever
61. 4: virbr0: Mtu 1500 qdisc noqueue state DOWN
62. Link/ether a6: 88: 9f: 14: b2: 66 brd ff: ff
63. Inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
64. Valid_lft forever preferred_lft forever

Note: Because the ip command is a tool in the iproute2 software package, instead of the old ifconfig command, try to use new commands and toolkit to eliminate old software and tools.

Iii. selinux firewall disabled

1. # Setenforce 0
2. # Sed-I's/= enforcing/= disabled/G'/etc/selinux/config