集群基础-----（fence的安装）

在物理机上
1.用7.2镜像安装下列软件
yum install fence-virtd-multicast.x86_64 fence-virtd.x86_64 fence-virtd-libvirt.x86_64 -y（网络监听器、电源管理器、内核层面控制虚拟机，关掉的话用户空间不能访问）

2.修改fence的配置：
fence_virtd -c

Module search path [/usr/lib64/fence-virt]: --可用模块

Available backends:
    libvirt 0.1
Available listeners:
    multicast 1.2

Listener modules are responsible for accepting requests
from fencing clients.

Listener module [multicast]: --监听的模块

The multicast listener module is designed for use environments
where the guests and hosts may communicate over a network using
multicast.

The multicast address is the address that a client will use to
send fencing requests to fence_virtd.

Multicast IP Address [225.0.0.12]: 

Using ipv4 as family.

Multicast IP Port [1229]: 

Setting a preferred interface causes fence_virtd to listen only
on that interface.  Normally, it listens on all interfaces.
In environments where the virtual machines are using the host
machine as a gateway, this *must* be set (typically to virbr0).
Set to 'none' for no interface.

Interface [virbr0]: br0

The key file is the shared key information which is used to
authenticate fencing requests.  The contents of this file must
be distributed to each physical host and virtual machine within
a cluster.

Key File [/etc/cluster/fence_xvm.key]: 

Backend modules are responsible for routing requests to
the appropriate hypervisor or management layer.

Backend module [libvirt]: 

Configuration complete.

=== Begin Configuration ===
backends {
    libvirt {
        uri = "qemu:///system";
    }

}

listeners {
    multicast {
        port = "1229";
        family = "ipv4";
        interface = "br0";
        address = "225.0.0.12";
        key_file = "/etc/cluster/fence_xvm.key";
    }

}

fence_virtd {
    module_path = "/usr/lib64/fence-virt";
    backend = "libvirt";
    listener = "multicast";
}

=== End Configuration ===
Replace /etc/fence_virt.conf with the above [y/N]? y

1. 
   a) cd /etc/cluster ##生成key之后文件所在的目录
   b) dd if=/dev/urandom of=/etc/cluster/fence_xvm.key bs=128 count=1 ##使用本机存在的取随机数的命令生成相应的key

4.
systemctl restart fence_virtd.service (确保火墙允许服务iptables -L)

    netstat -anulp | grep :1229
udp        0      0 0.0.0.0:1229            0.0.0.0:*                           8163/fence_virtd    

1. scp fence_xvm.key [email protected]:/etc/cluster/

   scp fence_xvm.key [email protected]:/etc/cluster/

节点一(server1)和节点四（server4）上相同
1.
[root@server1 ~]# cd /etc/cluster/
[root@server1 cluster]# ls
cluster.conf cman-notify.d fence_xvm.key
[root@server1 cluster]# ll
total 12
-rw-r—– 1 root root 261 Jul 22 17:00 cluster.conf
drwxr-xr-x 2 root root 4096 Sep 16 2013 cman-notify.d
-rw-r–r– 1 root root 128 Jul 24 10:51 fence_xvm.key
[root@server1 cluster]# cat cluster.conf ##以下操作在网页设置，自己更新到配置文件中

<cluster config_version="7" name="hahaha ">
    <clusternodes>
        <clusternode name="server1" nodeid="1">
            <fence>
                <method name="fence1">
                    <device domain="vm1" name="vmfence"/>
                method>
            fence>
        clusternode>
        <clusternode name="server4" nodeid="2">
            <fence>
                <method name="fence4">
                    <device domain="vm4" name="vmfence"/>
                method>
            fence>
        clusternode>
    clusternodes>
    <cman expected_votes="1" two_node="1"/>
    <fencedevices>
        <fencedevice agent="fence_xvm" name="vmfence"/>
    fencedevices>
cluster>

2.在两个结点上安装httpd

1 ) yum install -y httpd
2） ip addr
ps ax
3) cd /var/www/html/
ls
4) vim index.html ##编写
vim /etc/httpd/conf/httpd.conf ##查看端口是否是80
ip addr