KVM

网络服务

环境：RHEL 5.8
首先要更换使用CentOS的源：
Reinstall YUM：

#Uninstall YUM：
[root@Nagios ~]# rpm -aq|grep yum|xargs rpm -e --nodeps
#Download YUM packages:
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-3.2.22-40.el5.centos.noarch.rpm
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-4.el5.x86_64.rpm
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
wget http://mirrors.163.com/centos/5/os/x86_64/CentOS/python-iniparse-0.2.3-6.el5.noarch.rpm
#Install YUM：
[root@Nagios tools]# rpm -ivh python-iniparse-0.2.3-6.el5.noarch.rpm
Preparing...                ########################################### [100%]
       file /usr/lib/python2.4/site-packages/iniparse/compat.py from install of python-iniparse-0.2.3-6.el5.noarch conflicts with file from package python-iniparse-0.2.3-4.el5.noarch
       file /usr/lib/python2.4/site-packages/iniparse/compat.pyc from install of python-iniparse-0.2.3-6.el5.noarch conflicts with file from package python-iniparse-0.2.3-4.el5.noarch
       file /usr/lib/python2.4/site-packages/iniparse/compat.pyo from install of python-iniparse-0.2.3-6.el5.noarch conflicts with file from package python-iniparse-0.2.3-4.el5.noarch
#上面的提示信息可以忽略。
[root@Nagios tools]# rpm -ivh yum-metadata-parser-1.1.2-4.el5.x86_64.rpm
[root@Nagios tools]# rpm -ivh yum-3.2.22-40.el5.centos.noarch.rpm yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
#注意最后两个包必需同时安装，否则会相互依赖。

[root@Nagios ~]# vim /usr/bin/yum
#对首行进行修改：
#!/usr/bin/python --> #!/usr/bin/python2.4

更换YUM源：

#首先要导入CentOS-5的GPG证书：
[root@kvm-A1 ~]# rpm --import http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-5
[root@kvm-A1 ~]# cd /etc/yum.repos.d/
[root@kvm-A1 yum.repos.d]# mv redhat.repo redhat.repo.bak
[root@kvm-A1 yum.repos.d]# wget http://mirrors.163.com/.help/CentOS5-Base-163.repo
[root@kvm-A1 yum.repos.d]# sed -i 's/\$releasever/5/' CentOS5-Base-163.repo
yum clean all
yum makecache

报错解决：

[root@oaimage yum.repos.d]# yum makecache
Loaded plugins: katello, product-id, security, subscription-manager
Updating certificate-based repositories.
Unable to read consumer identity
Error getting repository data for RHEL5-lan, repository not found

红帽上Yum的原理是这样的，通过读取配置文件/etc/yum.repos.d/file.repo，通过里面提供的网址，到相应的站点下载软件包，然后调用底层的rpm程序进行安装。其中，在下载环节，需要提供“consumer id”。从理论上说，只要我们不到官方网站上下载软件，就能够避免注册问题。

安装：

[root@kvm-A1 ~]# yum -y install kvm kvm-* etherboot-roms-kvm.x86_64 virt-*

#Start libvirtd：
[root@kvm-A1 ~]# service libvirtd start
[root@kvm-A1 ~]# chkconfig libvirtd on

桥接器的生成：

[root@kvm-A1 ~]# cd /etc/sysconfig/network-scripts/
[root@kvm-A1 network-scripts]# cp ifcfg-eth0 ifcfg-br0
[root@kvm-server network-scripts]# echo "BRIDGE=br0" >> ifcfg-eth0
[root@kvm-server network-scripts]# cat ifcfg-eth0 
# Intel Corporation 82545EM Gigabit Ethernet Controller (Copper)
DEVICE=eth0
BOOTPROTO=none
HWADDR=00:50:56:BB:71:36
ONBOOT=yes
IPADDR=192.168.30.214
NETMASK=255.255.255.0
GATEWAY=192.168.30.1
BRIDGE=br0     #Bridge to