高可用软件KEEPALIVED安装
2018-01-01 11:11
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系统:centos6.5
虚拟IP:172.16.10.10
机器A:172.16.10.11
机器B:172.16.10.12
为了方便这里采用yum安装,源码安装我没试过,这里主要讲实现keepalived高可用的一些基础的设置。两天机子操作基本一致,,有不同的地方会专门指出。
安装命令yum install keepalived -y安装完成之后,配置文件是/etc/keepalived/keepalived.conf,修改它
贴一下我这里的两个配置吧
MASTER配置! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id NGINX_HA
}
#vrrp_script chk_port {
# script "/etc/keepalived/check_keepalived.sh"
# interval 1
# # weight 2
#}
vrrp_instance VI_2 {
state BACKUP
interface eth1
virtual_router_id 52
priority 100
nopreempt
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.10.10/16
}
SLAVE配置
这里有一点要注意,防火墙要放开VRRP广播。。vim /etc/sysconfig/iptables在-A INPUT -p icmp -j ACCEPT加入
最后我们启动keepalivedservice keepalived start
启动之后通过ip a命令可以查看虚拟IP是否成功
[root@jk-test php_client]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:50:56:aa:b9:4d brd ff:ff:ff:ff:ff:ff
inet 172.16.10.11/16 brd 172.16.255.255 scope global eth1
inet 172.16.10.10/16 scope global secondary eth1
inet6 fe80::250:56ff:feaa:b94d/64 scope link
valid_lft forever preferred_lft forever
[root@jk-test php_client]#
我们可以看到,在11这台电脑上,多了一个IP 172.16.10.10
此时如果我们在11上停止keepalived,就会发现虚拟IP跑到了12上。[root@jk-test php_client]# service keepalived stop
Stopping keepalived: [ OK ]
[root@jk-test php_client]#
下来我们用ip a看一下12[root@jk-test php_client]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:50:56:aa:08:69 brd ff:ff:ff:ff:ff:ff
inet 172.16.10.12/16 brd 172.16.255.255 scope global eth1
inet 172.16.10.10/16 scope global secondary eth1
inet6 fe80::250:56ff:feaa:869/64 scope link
valid_lft forever preferred_lft forever
[root@jk-test php_client]#
此时我们发现虚拟IP已经跑到了12上,好了今天就到这里,以后有新东西我会在下面补充。
虚拟IP:172.16.10.10
机器A:172.16.10.11
机器B:172.16.10.12
为了方便这里采用yum安装,源码安装我没试过,这里主要讲实现keepalived高可用的一些基础的设置。两天机子操作基本一致,,有不同的地方会专门指出。
安装命令yum install keepalived -y安装完成之后,配置文件是/etc/keepalived/keepalived.conf,修改它
vim /etc/keepalived/keepalived.conf输入内容如下
! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id NGINX_HA } #vrrp_script chk_port { # script "/etc/keepalived/check_keepalived.sh" # interval 1 # # weight 2 #} vrrp_instance VI_2 { state BACKUP #表示本机的装填,必须大写,正常情况下,一个机器为MASTER,另一个为BACKUP。不过我一般两个都是BACKUP,这个不影响。 interface eth1 #虚拟IP绑定的网卡名称。用ifconfig查看自己的网卡名称,改成自己的就可以。 virtual_router_id 52 #虚拟路由ID,如果你局域网里面有多个软件要用到KEEPALIVED的话,需要把这个的值改成不一样的,,否则会出现相互干扰的状况。 priority 100 #这个怎么翻译我忘了,这个值一般情况下,哪个数字大,哪个就会成为MASTER。master和slave这里的值需要不一样,并且差值的绝对值要小于其他模块weight的值 nopreempt #不抢占模式,假设master挂掉,虚拟IP会自动切换到slave上,等master恢复正常,就会变成新的slave。不会导致抢占发生VIP漂移的现象。如果不加此项原master在加入后会抢占成为master,发生虚拟IP漂移 advert_int 1 #这个忘了,一般不动。 authentication { #验证相关的,两天机子保持一致即可,一般不改变 auth_type PASS auth_pass 1111 } virtual_ipaddress { 172.16.10.10/16 #虚拟IP地址和掩码 }
贴一下我这里的两个配置吧
MASTER配置! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id NGINX_HA
}
#vrrp_script chk_port {
# script "/etc/keepalived/check_keepalived.sh"
# interval 1
# # weight 2
#}
vrrp_instance VI_2 {
state BACKUP
interface eth1
virtual_router_id 52
priority 100
nopreempt
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.10.10/16
}
SLAVE配置
! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id NGINX_HA } #vrrp_script chk_port { # script "/etc/keepalived/check_keepalived.sh" # interval 1 # # weight 2 #} vrrp_instance VI_2 { state BACKUP interface eth1 virtual_router_id 52 priority 80 nopreempt advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 172.16.10.10/16 }
这里有一点要注意,防火墙要放开VRRP广播。。vim /etc/sysconfig/iptables在-A INPUT -p icmp -j ACCEPT加入
-A INPUT -p vrrp -j ACCEPT保存退出,重启防火墙。
最后我们启动keepalivedservice keepalived start
启动之后通过ip a命令可以查看虚拟IP是否成功
[root@jk-test php_client]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:50:56:aa:b9:4d brd ff:ff:ff:ff:ff:ff
inet 172.16.10.11/16 brd 172.16.255.255 scope global eth1
inet 172.16.10.10/16 scope global secondary eth1
inet6 fe80::250:56ff:feaa:b94d/64 scope link
valid_lft forever preferred_lft forever
[root@jk-test php_client]#
我们可以看到,在11这台电脑上,多了一个IP 172.16.10.10
此时如果我们在11上停止keepalived,就会发现虚拟IP跑到了12上。[root@jk-test php_client]# service keepalived stop
Stopping keepalived: [ OK ]
[root@jk-test php_client]#
下来我们用ip a看一下12[root@jk-test php_client]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:50:56:aa:08:69 brd ff:ff:ff:ff:ff:ff
inet 172.16.10.12/16 brd 172.16.255.255 scope global eth1
inet 172.16.10.10/16 scope global secondary eth1
inet6 fe80::250:56ff:feaa:869/64 scope link
valid_lft forever preferred_lft forever
[root@jk-test php_client]#
此时我们发现虚拟IP已经跑到了12上,好了今天就到这里,以后有新东西我会在下面补充。
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