这篇文章主要介绍了MySQL5.7+MHA+Keepalived高可用配置的示例分析，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
数据库架构：一主两从
master：192.168.8.57
slave1：192.168.8.58
slave2：192.168.8.59
manager：192.168.8.60
MHA工具包：
mha4mysql-manager-0.58.tar.gz
mha4mysql-node-0.58.tar.gz
keepalived-1.4.5.tar.gz
一、主从复制环境和MHA安装如下
http://blog.itpub.net/30135314/viewspace-2217566/
二、配置MHA相关文件
master_ip_failover
my $vip = '192.168.8.88/24'; my $key = '1'; my $ssh_start_vip = "systemctl start keepalived"; my $ssh_stop_vip = "systemctl stop keepalived";
master_ip_online_change
my $vip = '192.168.8.88/24'; my $key = '1'; my $ssh_start_vip = "systemctl start keepalived"; my $ssh_stop_vip = "systemctl stop keepalived"; my $orig_master_ssh_port = 22; my $new_master_ssh_port = 22; my $ssh_user = "root"; my $new_master_password='mysql'; my $orig_master_password='mysql';
三、添加非本机 IP 邦定支持
echo "net.ipv4.ip_nonlocal_bind=1" >> /etc/sysctl.conf sysctl -p
四、安装配置keepalived
mount /dev/cdrom /mnt yum install kernel-devel openssl-devel popt-devel -y
tar zxvf keepalived-1.4.5.tar.gz cd keepalived-1.4.5 ./configure --prefix=/usr/local/keepalived/ make && make install
设置 keepalived 开机自动启动
systemctl enable keepalived
配置keepalived
192.168.8.57
mkdir /etc/keepalived
# vi /etc/keepalived/keepalived.conf
! Configuration file for keepalived
global_defs {
notification_email {
[email protected]
}
router_id 8.57
notification_email_from [email protected]
smtp_server stmp.163.com
smtp_connect_timeout 30
}
vrrp_instance v_mysql {
state BACKUP
interface enp0s3
virtual_router_id 200
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass mysql
}
virtual_ipaddress {
192.168.8.88/24
}
}
virtual_server 192.168.8.57 3306 {
delay_loop 2
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.8.57 3306 {
weight 3
notify_down /etc/keepalived/keepalived_stop.sh
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
echo "#!/bin/bash" >/etc/keepalived/keepalived_stop.sh echo "pkill keepalived" >>/etc/keepalived/keepalived_stop.sh chmod u+x /etc/keepalived/keepalived_stop.sh
192.168.8.58
mkdir /etc/keepalived
# vi /etc/keepalived/keepalived.conf
! Configuration file for keepalived
global_defs {
notification_email {
[email protected]
}
router_id 8.58
notification_email_from [email protected]
smtp_server stmp.163.com
smtp_connect_timeout 30
}
vrrp_instance v_mysql {
state BACKUP
interface enp0s3
virtual_router_id 200
priority 90
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass mysql
}
virtual_ipaddress {
192.168.8.88/24
}
}
virtual_server 192.168.8.58 3306 {
delay_loop 2
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.8.58 3306 {
weight 3
notify_down /etc/keepalived/keepalived_stop.sh
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
echo "#!/bin/bash" >/etc/keepalived/keepalived_stop.sh echo "pkill keepalived" >>/etc/keepalived/keepalived_stop.sh chmod u+x /etc/keepalived/keepalived_stop.sh
五、启动并查看keepalived
192.168.8.57和192.168.8.58
systemctl daemon-reload systemctl start keepalived systemctl enable keepalived ps -ef |grep keepalived
看到如下进程，即启动正常，否则，启动失败
#ps -ef|grep keepalived root 16916 1 0 14:53 ? 00:00:00 /usr/local/keepalived/sbin/keepalived -D root 16917 16916 0 14:53 ? 00:00:00 /usr/local/keepalived/sbin/keepalived -D root 16918 16916 0 14:53 ? 00:00:00 /usr/local/keepalived/sbin/keepalived -D root 17772 9992 0 16:17 pts/2 00:00:00 grep --color=auto keepalived
查看VIP
192.168.8.57
# ip a|grep 88 inet 192.168.8.88/24 scope global secondary enp0s3
192.168.8.58看不到192.168.8.88/24
六、测试keepalived可用性（测试之前关闭MHA进程，避免故障切换造成干扰）
MySQL连接测试
查到目前VIP192.168.8.88在192.168.8.57这个机器
# mysql -uroot -pmysql -h292.168.8.88 -e "show variables like 'server_id'" mysql: [Warning] Using a password on the command line interface can be insecure. +---------------+-------+ | Variable_name | Value | +---------------+-------+ | server_id | 57 | +---------------+-------+
关闭keepalived测试
关闭192.168.8.57上keepalived进程，此时在此节点已查不到VIP
ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 08:00:27:4d:70:17 brd ff:ff:ff:ff:ff:ff inet 192.168.8.58/24 brd 192.168.8.255 scope global noprefixroute enp0s3 valid_lft forever preferred_lft forever inet 192.168.8.88/24 scope global secondary enp0s3 valid_lft forever preferred_lft forever inet6 fe80::6a31:3e92:8b6f:83c0/64 scope link noprefixroute valid_lft forever preferred_lft forever inet6 fe80::5198:593b:cdc5:1f90/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft forever 3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000 link/ether 52:54:00:f4:55:bb brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever 4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000 link/ether 52:54:00:f4:55:bb brd ff:ff:ff:ff:ff:ff
可以看到VIP已经飘至192.168.8.58
此时启动192.168.8.57上的keepalived进程，VIP依然在192.168.8.58节点。
模拟宕机测试
查看VIP位置
mysql -uroot -pmysql -h292.168.8.88 -e "show variables like 'server_id'" mysql: [Warning] Using a password on the command line interface can be insecure. +---------------+-------+ | Variable_name | Value | +---------------+-------+ | server_id | 57 | +---------------+-------+
关闭192.168.8.57节点mysql进程
mysql -uroot -pmysql -h292.168.8.88 -e "show variables like 'server_id'" mysql: [Warning] Using a password on the command line interface can be insecure. +---------------+-------+ | Variable_name | Value | +---------------+-------+ | server_id | 58 | +---------------+-------+
可以看到VIP已飘至192.168.8.58节点
七、修改keepalived日志位置
默认日志存放在系统日志：/var/log/messages 下
把日志单独存放
修改 vi /usr/local/keepalived/etc/sysconfig/keepalived
把 KEEPALIVED_OPTIONS=”-D” 修改为：KEEPALIVED_OPTIONS=”-D -d -S 0″
vi /usr/local/keepalived/etc/sysconfig/keepalived # Options for keepalived. See `keepalived --help' output and keepalived(8) and # keepalived.conf(5) man pages for a list of all options. Here are the most # common ones : # # --vrrp -P Only run with VRRP subsystem. # --check -C Only run with Health-checker subsystem. # --dont-release-vrrp -V Dont remove VRRP VIPs & VROUTEs on daemon stop. # --dont-release-ipvs -I Dont remove IPVS topology on daemon stop. # --dump-conf -d Dump the configuration data. # --log-detail -D Detailed log messages. # --log-facility -S 0-7 Set local syslog facility (default=LOG_DAEMON) # KEEPALIVED_OPTIONS="-D -d -S 0"
在/etc/rsyslog.conf 末尾添加
vi /etc/rsyslog.conf local0.* /var/log/keepalived.log
RHEL6:
/etc/init.d/rsyslog restart
/etc/init.d/keepalived restart
RHEL7:
systemctl restart rsyslog
systemctl restart keepalived
查看keepalived日志
# tail -100f /var/log/keepalived.log Oct 27 17:07:25 master Keepalived_vrrp[22697]: ------< Global definitions >------ Oct 27 17:07:25 master Keepalived_vrrp[22697]: Router ID = 8.57 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Smtp server connection timeout = 30 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Email notification from = [email protected] Oct 27 17:07:25 master Keepalived_vrrp[22697]: Email notification = [email protected] Oct 27 17:07:25 master Keepalived_vrrp[22697]: Default interface = eth0 Oct 27 17:07:25 master Keepalived_vrrp[22697]: LVS flush = false Oct 27 17:07:25 master Keepalived_vrrp[22697]: VRRP IPv4 mcast group = 224.0.0.18 Oct 27 17:07:25 master Keepalived_vrrp[22697]: VRRP IPv6 mcast group = ff02::12 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Gratuitous ARP delay = 5 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Gratuitous ARP repeat = 5 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Gratuitous ARP refresh timer = 0 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Gratuitous ARP refresh repeat = 1 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Gratuitous ARP lower priority delay = 5 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Gratuitous ARP lower priority repeat = 5 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Send advert after receive lower priority advert = true Oct 27 17:07:25 master Keepalived_vrrp[22697]: Send advert after receive higher priority advert = false Oct 27 17:07:25 master Keepalived_vrrp[22697]: Gratuitous ARP interval = 0 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Gratuitous NA interval = 0 Oct 27 17:07:25 master Keepalived_vrrp[22697]: VRRP default protocol version = 2 Oct 27 17:07:25 master Keepalived_vrrp[22697]: Iptables input chain = INPUT Oct 27 17:07:25 master Keepalived_vrrp[22697]: VRRP check unicast_src = false
可以看到日志已经输出，位置已变。
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