linux企业常用服务
部署前准备：iptables和selinux没配置，关掉
挂载系统镜像作为本地yum源，修改yum文件
源码包准备keepalived-1.2.13.tar.gz
环境介绍：
主服务器ip：192.168.100.157(keeplived+lvs)
从服务器ip：192.168.100.156(keeplived+lvs)
节点服务器ip:192.168.100.153-192.168.100.155(httpd)
集群vip：192.168.100.95
1.安装keepalived（在两台调度服务器上安装，192.168.100.157，192.168.100.156）
yum -y install kernel-devel openssl-devel popt-devel ipvsadm
tar zxvf keepalived-1.2.13.tar.gz -C /usr/src/
cd /usr/src/keepalived-1.2.13/
./configure --prefix=/ --with-kernel-dir=/usr/src/kernels/2.6.32-431.el6.x86_64/
make &&make install
cd
# ls /etc/keepalived/
keepalived.confsamples
chkconfig --add keepalived
chkconfig keepalived on
2.配置调度器（主：192.168.100.157，备：192.168.100.156，漂移ip：192.168.100.95）web服务器池（节点1:192.168.100.153、节点2:192.168.100.154、节点3：192.168.100.155）
1）、配置主HA调度服务器
cd /etc/keepalived/
mv keepalived.conf keepalived.conf.bak
vi /etc/keepalived/keepalived.conf
global_defs {
router_id HA_TEST_R1##本服务器的名称
}
vrrp_instance VI_1 {##定义VRRP热备实例
state MASTER##MASTER表示主服务器
interface eth0##承载VIP地址的物理接口
virtual_router_id 1##虚拟路由器的ID号
priority 100##优先级，数值越大优先级越高
advert_int 1##通告间隔秒数（心跳频率）
authentication {##认证信息
auth_type PASS##认证类型
auth_pass 123456##密码字串
}
virtual_ipaddress {
192.168.100.95##指定漂移地址（VIP）
}
virtual_server 192.168.100.95 80 {
delay_loop 15
lb_algo rr
lb_kind DR
protocol TCP
real_server 192.168.100.153 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 4
}
}
real_server 192.168.100.154 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 4
}
}
real_server 192.168.100.155 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 4
}
}
}
:wq
modprobe ip_vs
lsmod |grep ip_vs
echo "modprobe ip_vs" >>/etc/rc.local
/etc/init.d/keepalived restart
chkconfig ipvsadm off
ip addr show dev eth0
2）、配置HA从调度服务器
cd /etc/keepalived/
mv keepalived.conf keepalived.conf.bak
vi /etc/keepalived/keepalived.conf
global_defs {
router_id HA_TEST_R2##本服务器的名称
}
vrrp_instance VI_1 {##定义VRRP热备实例
state BACKUP##BACKUP表示主服务器
interface eth0##承载VIP地址的物理接口
virtual_router_id 1##虚拟路由器的ID号
priority 99##优先级，数值越大优先级越高
advert_int 1##通告间隔秒数（心跳频率）
authentication {##认证信息
auth_type PASS##认证类型
auth_pass 123456##密码字串
}
virtual_ipaddress {
192.168.100.95##指定漂移地址（VIP）
}
virtual_server 192.168.100.95 80 {
delay_loop 15
lb_algo rr
lb_kind DR
protocol TCP
real_server 192.168.100.153 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 4
}
}
real_server 192.168.100.154 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 4
}
}
real_server 192.168.100.155 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 4
}
}
}
:wq
modprobe ip_vs
lsmod |grep ip_vs
echo "modprobe ip_vs" >>/etc/rc.local
/etc/init.d/keepalived restart
chkconfig ipvsadm off
ip addr show dev eth0
3.配置Web节点服务器（DR工作模式的配置，分别在节点服务器上做如下设置）
cd /etc/sysconfig/network-script/
cp ifcfg-lo ifcfg-lo:0
vi ifcfg-lo:0
DEVICE=lo:0
IPADDR=192.168.100.95
NETMASK=255.255.255.255
ONBOOT=yes
:wq
/etc/init.d/network restart
echo "route add -host 192.168.100.95 dev lo:0" >>/etc/rc.local
route add -host 192.168.100.95 dev lo:0
ip addr show dev lo
vi /etc/sysctl.conf
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
:wq
sysctl -p
yum -y install httpd
vi /var/www/html/index.html
test page 192.168.100.153!!!!
:wq
/etc/init.d/httpd start
chkconfig httpd on
4.测试lvs+Keepalived高可用集群
在客户机浏览器访问192.168.100.95，调度服务器可用坏一个，节点服务器至少要有一个是好的。
通过/var/log/message日志文件，跟踪故障切换过程。使用ipvsadm -Ln查看LVS。
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