mysql8 keepalived_mysql8+keepalived 双主高可用搭建
配置keepalived
注意：记得关闭防火墙或者增加vrrp策略
1、安装
注意：先创建 /usr/local/keepalived(新建文件夹)
# tar -zxf keepalived-2.1.5.tar.gz
# cd keepalived-2.0.0# ./configure --prefix=/usr/local/keepalived
# make&&make install
# echo $?
0#
# cp/usr/local/keepalived/sbin/keepalived /usr/sbin/# cp/usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/# cp ./keepalived/etc/init.d/keepalived /etc/init.d/# mkdir /etc/keepalived# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
2、配置
1.修改master服务器 /etc/keepalived/keepalived.conf 文件
[root@ubantu~]# vim /etc/keepalived/keepalived.conf! Configuration File forkeepalived
global_defs {
notification_email { #故障发生时给谁发邮件通知。[email protected]
}
[email protected] #通知邮件的发出地址。
smtp_server127.0.0.1#发现Email的smtp地址
smtp_connect_timeout30#超时时间
router_id node1
script_user root
enable_script_security
}
vrrp_script check_run
{
script"/etc/keepalived/mysql.sh"interval10}
vrrp_instance VI_1 {
state BACKUP #可以是 MASTER 或 BACKUP，不过当其他节点 keepalived 启动时
#会将 Priority(优先级)比较大的节点选举为 MASTER，因此该项其实没有实质用途。interfaceens18 #本机物理网卡，节点固有 IP(非 VIP)的网卡，用来发 VRRP包。
lvs_sync_daemon_inteface ens18 #绑定 lvs syncd 的网卡。
virtual_router_id151 #虚拟路由，主从机必需一致。设置 VRID，取值在 0-255之间，用来区分多个 instance 的 VRRP 组播
#(同一网段中 virtual_router_id 的值不能重复，否则会出错)。
#将决定多播的 MAC 地址
priority100 #用来选举 master，要成为 master，这个选项的值最好高于其他机器 50个点，
#该项取值范围是1-255(在此范围之外会被识别成默认值 100)。
advert_int5#发 VRRP 包的时间间隔，即多久进行一次 master 选举(可以认为是健康检查时间间隔，默认1秒)。
authentication { #认证区域，保持master和backup一致
auth_type PASS
auth_pass1111}
track_script {
check_run
}
virtual_ipaddress { #VIP(虚拟 IP 地址)，随着 state 的变化而增加删除，
#当 state 为 master 的时候就添加，当 state 为 backup 的时候删除，
#主要由优先级来决定的，和 state 设置的值没有多大关系，可以设置多个 IP 地址。172.16.127.222dev ens18
}
}
virtual_server172.16.127.222 3306{ #LVS配置，VIP
delay_loop6#服务轮询的时间间隔
lb_algo wrr #LVS 调度算法
lb_kind DR #LVS 集群算法
persistence_timeout50#同一IP的链接50秒内被分配到同一台realserver
protocol TCP #用TCP协议检查realserver状态
real_server172.16.127.49 3306{ #实际服务器的IP和端口
weight100notify_down/etc/keepalived/keepalived.sh
TCP_CHECK {
connect_timeout10nb_get_retry3delay_before_retry3connect_port3306}
}
}
2.修改slave服务器 /etc/keepalived/keepalived.conf 文件
[root@ubantu ~]#vim /etc/keepalived/keepalived.conf! Configuration File forkeepalived
global_defs {
notification_email { #故障发生时给谁发邮件通知。[email protected]
}
[email protected] #通知邮件的发出地址。
smtp_server127.0.0.1#发现Email的smtp地址
smtp_connect_timeout30#超时时间
router_id node2 #运行keepalived的机器标识号，主从机必须不同
script_user root
enable_script_security
}
vrrp_script check_run
{
script"/etc/keepalived/mysql.sh"interval10}
vrrp_instance VI_1 {
state BACKUP #可以是 MASTER 或 BACKUP，不过当其他节点 keepalived 启动时
#会将 Priority(优先级)比较大的节点选举为 MASTER，因此该项其实没有实质用途。interfaceenp0s18 #本机物理网卡，节点固有 IP(非 VIP)的网卡，用来发 VRRP包。
lvs_sync_daemon_inteface enp0s18 #绑定 lvs syncd 的网卡。
virtual_router_id151 #虚拟路由，主从机必需一致。设置 VRID，取值在 0-255之间，用来区分多个 instance 的 VRRP 组播
#(同一网段中 virtual_router_id 的值不能重复，否则会出错)。
#将决定多播的 MAC 地址
priority90 #用来选举 master，要成为 master，这个选项的值最好高于其他机器 50个点，
#该项取值范围是1-255(在此范围之外会被识别成默认值 100)。
advert_int5#发 VRRP 包的时间间隔，即多久进行一次 master 选举(可以认为是健康检查时间间隔，默认1秒)。
authentication { #认证区域，保持master和backup一致
auth_type PASS
auth_pass1111}
track_script {
check_run
}
virtual_ipaddress { #VIP(虚拟 IP 地址)，随着 state 的变化而增加删除，
#当 state 为 master 的时候就添加，当 state 为 backup 的时候删除，
#主要由优先级来决定的，和 state 设置的值没有多大关系，可以设置多个 IP 地址。172.16.127.222dev enp0s18
}
}
virtual_server172.16.127.222 3306{ #LVS配置，VIP
delay_loop6#服务轮询的时间间隔
lb_algo wrr #LVS 调度算法
lb_kind DR #LVS 集群算法
persistence_timeout50#同一IP的链接50秒内被分配到同一台realserver
protocol TCP #用TCP协议检查realserver状态
real_server172.16.127.83 3306{ #实际服务器的IP和端口
weight100notify_down/etc/keepalived/keepalived.sh
TCP_CHECK {
connect_timeout10nb_get_retry3delay_before_retry3connect_port3306}
}
}
3、两台服务器创建脚本
[root@ubantu ~]#vi /etc/keepalived/keepalived.sh
pkill keepalived
[root@ubantu~]#
[root@ubantu ~]#vi /etc/keepalived/mysql.sh
ql-uroot -puw7!23!Qw2 -e "select version();" >/dev/null 2>&1#mysql-u数据库账号 -p数据库密码 -e "show status;"#if [ $? -ne 0] ;then
#echo $(date)". mysql error!" >>/etc/keepalived/action.log
sudo service keepalived stopif [ $? -ne 0] ;then
echo $(date+'%Y-%m-%d %H:%M:%S')". mysql error.but ACTION keepalived-stop failed." >>/etc/keepalived/action.logelseecho $(date+'%Y-%m-%d %H:%M:%S')". mysql error.ACTION keepalived-stop success." >>/etc/keepalived/action.log
fielsekeepalivedcheck=`ps -C keepalived --no-header | wc -l`if [ $keepalivedcheck -eq 0] ;then
sudo service keepalived startif [ $? -ne 0] ;then
echo $(date+'%Y-%m-%d %H:%M:%S')". mysql normal,keepalived already stopped.but ACTION keepalived-start failed" >>/etc/keepalived/action.logelseecho $(date+'%Y-%m-%d %H:%M:%S')". mysql normal,keepalived already stopped.ACTION keepalived-start success" >>/etc/keepalived/action.log
fi
###test code#else#echo $(date)". keepalived is running!" >>/etc/keepalived/action.log
##test code
fi
#echo $(date)". mysql running!" >>/etc/keepalived/action.log
fi
[root@ubantu~]#
最后授权执行脚本：chmod +x /etc/keepalived/某某.sh
4、启动
root@ubuntu:/#service keepalived start
root@ubuntu:/# ps -ef |grep keep
root2063 1 0 16:35 ? 00:00:00 /usr/local/keepalived/sbin/keepalived -D
root2064 2063 0 16:35 ? 00:00:00 /usr/local/keepalived/sbin/keepalived -D
root2065 2063 0 16:35 ? 00:00:00 /usr/local/keepalived/sbin/keepalived -D
root14999 17440 0 17:53 pts/0 00:00:00 grep --color=auto keep
5、查看两端的虚拟IP启动情况，系统日志
1.master的
root@ubuntu:/# ip a1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet127.0.0.1/8scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128scope host
valid_lft forever preferred_lft forever2: ens18: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether fe:fc:fe:d1:fb:17brd ff:ff:ff:ff:ff:ff
inet172.16.127.49/24 brd 172.16.127.255 scope globalens18
valid_lft forever preferred_lft forever
inet172.16.127.222/32 scope globalens18
valid_lft forever preferred_lft forever
inet6 fe80::fcfc:feff:fed1:fb17/64scope link
valid_lft forever preferred_lft forever
2.slave的
root@ubuntu:/# ip a1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet127.0.0.1/8scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128scope host
valid_lft forever preferred_lft forever2: enp0s18: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000link/ether fe:fc:fe:e0:c5:44brd ff:ff:ff:ff:ff:ff
inet172.16.127.83/24 brd 172.16.127.255 scope globalenp0s18
valid_lft forever preferred_lft forever
inet6 fe80::fcfc:feff:fee0:c544/64scope link
valid_lft forever preferred_lft forever
对比上面的说明绑上VIP了
3.抓包检查，只有一台服务向224.0.0.18发送，就证明正常了
root@ubuntu:/# tcpdump -i ens18 vrrp -n
tcpdump: verbose output suppressed, use-v or -vv forfull protocol decode
listening on ens18, link-type EN10MB (Ethernet), capture size 262144bytes17:57:34.245115 IP 172.16.127.49 > 224.0.0.18: VRRPv2, Advertisement, vrid 151, prio 100, authtype simple, intvl 5s, length 20
17:57:39.245262 IP 172.16.127.49 > 224.0.0.18: VRRPv2, Advertisement, vrid 151, prio 100, authtype simple, intvl 5s, length 20
17:57:44.245503 IP 172.16.127.49 > 224.0.0.18: VRRPv2, Advertisement, vrid 151, prio 100, authtype simple, intvl 5s, length 20
6、自行停掉服务进行测试