Mysql HA-Install Keepalived+LVS+Mysql（双主） On Redhat 6.3，keepalivedlvs
主机信息：
调度节点： Name：lvs OS:Redhat 6.3 IP:192.168.56.235 VIP:192.168.56.236 数据节点1： Name：zbdba1 OS:Redhat 6.3 IP:192.168.56.230 数据节点2： Name：zbdba2 OS:Redhat 6.3 IP:192.168.56.231 客户端： Name：ogg2 OS:Redhat 6.3 IP:192.168.56.231
描述：数据节点1跟数据节点2互为主从 ，应用从客户端访问调度节点从而访问数据库。节点1和节点2任意一个宕机不影响业务
LVS：
LVS集群采用IP负载均衡技术和基于内容请求分发技术。调度器具有很好的吞吐率，将请求均衡地转移到不同的服务器上执行，且调度器自动屏蔽掉服务器的故障，从而将一组服务器构成一个高性能的、高可用的虚拟服务器。整个服务器集群的结构对客户是透明的，而且无需修改客户端和服务器端的程序。为此，在设计时需要考虑系统的透明性、可伸缩性、高可用性和易管理性。
可伸缩网络服务的几种结构，它们都需要一个前端的负载调度器（或者多个进行主从备份）。我们先分析实现虚拟网络服务的主要技术，指出IP负载均衡技术是在负载调度器的实现技术中效率最高的。在已有的IP负载均衡技术中，主要有通过网络地址转换（Network Address Translation）将一组服务器构成一个高性能的、高可用的虚拟服务器，我们称之为VS/NAT技术（Virtual Server via Network Address Translation）。在分析VS/NAT的缺点和网络服务的非对称性的基础上，我们提出了通过IP隧道实现虚拟服务器的方法VS/TUN （Virtual Server via IP Tunneling），和通过直接路由实现虚拟服务器的方法VS/DR（Virtual Server via Direct Routing），它们可以极大地提高系统的伸缩性。VS/NAT、VS/TUN和VS/DR技术是LVS集群中实现的三种IP负载均衡技术。
Keepalived：
Keepalived is a routing software written in C. The main goal of this project is to provide simple and robust facilities for loadbalancing and high-availability to Linux system and Linux based infrastructures. Loadbalancing framework relies on well-known and widely used Linux Virtual Server (IPVS) kernel module providing Layer4 loadbalancing. Keepalived implements a set of checkers to dynamically and adaptively maintain and manage loadbalanced server pool according their health. On the other hand high-availability is achieved by VRRP protocol. VRRP is a fundamental brick for router failover. In addition, Keepalived implements a set of hooks to the VRRP finite state machine providing low-level and high-speed protocol interactions. Keepalived frameworks can be used independently or all together to provide resilient infrastructures.
具体步骤：
1、安装lvs+keepalived
2、配置数据节点
3、客户端测试
4、宕机测试
1、安装lvs+keepalived：
在调度节点上操作
安装依赖包：
yum install popt-devel openssl* yum install libn安装ipvsadm：
rpm -ivh popt-static-1.13-7.el6.x86_64.rpm [root@lvs ipvsadm-1.26]#make && make install安装keepalived:
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/ cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ mkdir /etc/keepalived配置keepalived:
具体参数解释，可参见官方文档：
http://www.keepalived.org/pdf/UserGuide.pdf
[root@lvs keepalived]# cat keepalived.conf
global_defs {
router_id HaMySQL_1
}
vrrp_sync_group VGM {
group {
VI_MYSQL
}
}
vrrp_instance VI_MYSQL {
state MASTER
interface eth0
virtual_router_id 100
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.56.236/24 dev eth0 label eth0:1
}
}
virtual_server 192.168.56.236 3306 {
delay_loop 6
lb_algo wlc
lb_kind DR
persistence_timeout 50
protocol TCP
nat_mask 255.255.255.0
real_server 192.168.56.230 3306 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
real_server 192.168.56.231 3306 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
2、配置数据节点：在数据节点1和数据节点2上进行操作
mysql的安装以及双主配置不再说明
配置lvs节点
vi /etc/rc.d/init.d/realserver.sh
[root@zbdba1 init.d]# cat realserver.sh
#!/bin/bash
# description: Config realserver lo and apply noarp
SNS_VIP=192.168.56.236
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
[root@zbdba2 init.d]# cat realserver.sh
#!/bin/bash
# description: Config realserver lo and apply noarp
SNS_VIP=192.168.56.236
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
chmod +x realserver.sh
启动数据节点：
[root@zbdba1 init.d]# ./realserver.sh start RealServer Start OK [root@zbdba2 init.d]# ./realserver.sh start RealServer Start OK启动调度节点：
service keepalived start查看日志：
tail -100f /var/log/messages Jan 27 02:48:26 lvs Keepalived[2805]: Starting Keepalived v1.2.4 (01/22,2015) Jan 27 02:48:26 lvs Keepalived[2806]: Starting Healthcheck child process, pid=2808 Jan 27 02:48:26 lvs Keepalived[2806]: Starting VRRP child process, pid=2809 Jan 27 02:48:26 lvs Keepalived_vrrp[2809]: Interface queue is empty Jan 27 02:48:26 lvs Keepalived_healthcheckers[2808]: Interface queue is empty Jan 27 02:48:26 lvs Keepalived_healthcheckers[2808]: Netlink reflector reports IP 192.168.56.235 added Jan 27 02:48:26 lvs Keepalived_healthcheckers[2808]: Netlink reflector reports IP fe80::a00:27ff:fe9e:856c added Jan 27 02:48:26 lvs Keepalived_healthcheckers[2808]: Registering Kernel netlink reflector Jan 27 02:48:26 lvs Keepalived_healthcheckers[2808]: Registering Kernel netlink command channel Jan 27 02:48:26 lvs Keepalived_vrrp[2809]: Netlink reflector reports IP 192.168.56.235 added Jan 27 02:48:26 lvs Keepalived_vrrp[2809]: Netlink reflector reports IP fe80::a00:27ff:fe9e:856c added Jan 27 02:48:26 lvs Keepalived_vrrp[2809]: Registering Kernel netlink reflector Jan 27 02:48:26 lvs Keepalived_vrrp[2809]: Registering Kernel netlink command channel Jan 27 02:48:26 lvs Keepalived_vrrp[2809]: Registering gratuitous ARP shared channel Jan 27 02:48:46 lvs Keepalived_healthcheckers[2808]: Opening file '/etc/keepalived/keepalived.conf'. Jan 27 02:48:46 lvs Keepalived_healthcheckers[2808]: Configuration is using : 12606 Bytes Jan 27 02:48:46 lvs Keepalived_vrrp[2809]: Opening file '/etc/keepalived/keepalived.conf'. Jan 27 02:48:46 lvs Keepalived_vrrp[2809]: Configuration is using : 63868 Bytes Jan 27 02:48:46 lvs Keepalived_vrrp[2809]: Using LinkWatch kernel netlink reflector... Jan 27 02:48:46 lvs Keepalived_vrrp[2809]: VRRP sockpool: [ifindex(2), proto(112), fd(10,11)] Jan 27 02:48:46 lvs Keepalived_healthcheckers[2808]: Using LinkWatch kernel netlink reflector... Jan 27 02:48:46 lvs Keepalived_healthcheckers[2808]: Activating healthchecker for service [192.168.56.230]:3306 Jan 27 02:48:46 lvs Keepalived_healthcheckers[2808]: Activating healthchecker for service [192.168.56.231]:3306 Jan 27 02:48:47 lvs Keepalived_vrrp[2809]: VRRP_Instance(VI_MYSQL) Transition to MASTER STATE Jan 27 02:48:48 lvs Keepalived_vrrp[2809]: VRRP_Instance(VI_MYSQL) Entering MASTER STATE Jan 27 02:48:48 lvs Keepalived_vrrp[2809]: VRRP_Instance(VI_MYSQL) setting protocol VIPs. Jan 27 02:48:48 lvs Keepalived_vrrp[2809]: VRRP_Instance(VI_MYSQL) Sending gratuitous ARPs on eth0 for 192.168.56.236 Jan 27 02:48:48 lvs Keepalived_vrrp[2809]: VRRP_Group(VGM) Syncing instances to MASTER state Jan 27 02:48:48 lvs Keepalived_healthcheckers[2808]: Netlink reflector reports IP 192.168.56.236 added Jan 27 02:48:53 lvs Keepalived_vrrp[2809]: VRRP_Instance(VI_MYSQL) Sending gratuitous ARPs on eth0 for 192.168.56.236查看ip：
[root@lvs keepalived]# 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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:9e:85:6c brd ff:ff:ff:ff:ff:ff
inet 192.168.56.235/24 brd 192.168.56.255 scope global eth0
inet 192.168.56.236/32 scope global eth0
inet6 fe80::a00:27ff:fe9e:856c/64 scope link
valid_lft forever preferred_lft forever
[root@lvs keepalived]# ifconfig
eth0 Link encap:Ethernet HWaddr 08:00:27:9E:85:6C
inet addr:192.168.56.235 Bcast:192.168.56.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe9e:856c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:26130 errors:0 dropped:0 overruns:0 frame:0
TX packets:50826 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:20095690 (19.1 MiB) TX bytes:3705309 (3.5 MiB)
eth0:1 Link encap:Ethernet HWaddr 08:00:27:9E:85:6C
inet addr:192.168.56.236 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:268 errors:0 dropped:0 overruns:0 frame:0
TX packets:268 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:21264 (20.7 KiB) TX bytes:21264 (20.7 KiB)
查看lvs节点：
[root@lvs keepalived]# ipvsadm IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.56.236:mysql wlc -> 192.168.56.230:mysql Route 3 0 0 -> 192.168.56.231:mysql Route 3 0 0查看数据节点：
[root@zbdba1 init.d]# 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
inet 192.168.56.236/32 brd 192.168.56.236 scope global lo:0
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:7d:74:19 brd ff:ff:ff:ff:ff:ff
inet 192.168.56.230/24 brd 192.168.56.255 scope global eth0
inet6 fe80::a00:27ff:fe7d:7419/64 scope link
valid_lft forever preferred_lft forever
[root@zbdba1 init.d]# ifconfig
eth0 Link encap:Ethernet HWaddr 08:00:27:7D:74:19
inet addr:192.168.56.230 Bcast:192.168.56.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe7d:7419/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12835 errors:0 dropped:0 overruns:0 frame:0
TX packets:7778 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:924234 (902.5 KiB) TX bytes:896034 (875.0 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:32 errors:0 dropped:0 overruns:0 frame:0
TX packets:32 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:16477 (16.0 KiB) TX bytes:16477 (16.0 KiB)
lo:0 Link encap:Local Loopback
inet addr:192.168.56.236 Mask:255.255.255.255
UP LOOPBACK RUNNING MTU:16436 Metric:1
[root@zbdba2 init.d]# 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
inet 192.168.56.236/32 brd 192.168.56.236 scope global lo:0
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:a9:80:da brd ff:ff:ff:ff:ff:ff
inet 192.168.56.231/24 brd 192.168.56.255 scope global eth0
inet6 fe80::a00:27ff:fea9:80da/64 scope link
valid_lft forever preferred_lft forever
[root@zbdba2 init.d]# ifconfig
eth0 Link encap:Ethernet HWaddr 08:00:27:A9:80:DA
inet addr:192.168.56.231 Bcast:192.168.56.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fea9:80da/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12155 errors:0 dropped:0 overruns:0 frame:0
TX packets:6832 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:863609 (843.3 KiB) TX bytes:626772 (612.0 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:29 errors:0 dropped:0 overruns:0 frame:0
TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2167 (2.1 KiB) TX bytes:2167 (2.1 KiB)
lo:0 Link encap:Local Loopback
inet addr:192.168.56.236 Mask:255.255.255.255
UP LOOPBACK RUNNING MTU:16436 Metric:1
3、客户端测试mysql客户端安装不再详诉
[root@ogg2 ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 08:00:27:41:2D:0B
inet addr:192.168.56.13 Bcast:192.168.56.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe41:2d0b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:330 errors:0 dropped:0 overruns:0 frame:0
TX packets:380 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:34424 (33.6 KiB) TX bytes:32970 (32.1 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:87 errors:0 dropped:0 overruns:0 frame:0
TX packets:87 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:7656 (7.4 KiB) TX bytes:7656 (7.4 KiB)
在数据节点进行授权：
mysql> grant all on *.* to 'root'@'192.168.56.13' identified by 'mysql' with grant option; Query OK, 0 rows affected (0.00 sec)连接mysql：
[root@ogg2 ~]# mysql -uroot -pmysql -h192.168.56.236 Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 3247 Server version: 5.6.12-log MySQL Community Server (GPL) Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> ok，至此配置成功
4、宕机测试：
查看当前连的哪个节点：
mysql> show variables like 'log_error'; +---------------+------------------------+ | Variable_name | Value | +---------------+------------------------+ | log_error | /mysql/data/zbdba1.err | +---------------+------------------------+ 1 row in set (0.01 sec)发现连接的是数据节点1，这时候我们关闭数据节点1的mysql
[root@zbdba1 init.d]# service mysql stop Shutting down MySQL............ [ OK ]在调度节点查看日志：
[root@lvs ~]# tail -100f /var/log/messages Jan 27 02:58:24 lvs Keepalived_healthcheckers[2808]: TCP connection to [192.168.56.230]:3306 failed !!! Jan 27 02:58:24 lvs Keepalived_healthcheckers[2808]: Removing service [192.168.56.230]:3306 from VS [192.168.56.236]:3306发现已经被移除
查看lvs
[root@lvs keepalived]# ipvsadm IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.56.236:mysql wlc persistent 50 -> 192.168.56.231:mysql Route 3 0 0再回到客户端：
mysql> show variables like 'log_error'; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 294 Current database: *** NONE *** +---------------+------------------------+ | Variable_name | Value | +---------------+------------------------+ | log_error | /mysql/data/zbdba2.err | +---------------+------------------------+ 1 row in set (10.02 sec)发现此时连接重连，目前连接的是数据节点2。
至此我们已经达到我们单点故障的要求了。但是不仅仅限于此。我们利用lvs+keepalived 可以实现 从库负载均衡，NDB集群负载均衡。这里只是介绍lvs+keepalived基本使用。有了这两个工具再结合其他mysql其他架构，可实现高可用、高性能。
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