虚拟ip飘逸
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说到Failover,通常有两种方式:一种是虚拟IP地址,一种是全局配置文件。
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MHA并没有限定使用哪一种方式,而是让用户自己选择,虚拟IP地址的方式会牵扯到其它的软件,这里就不赘述了
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上篇文章搭建mha+keepalive就是通过keepalive来控制虚拟ip,本片文章在介绍一种虚拟ip的方式
配置虚拟ip
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采用ifconfig的方式
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/sbin/ifconfig eth0:1 192.168.6.66/24
删除VIP:
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/sbin/ifconfig eth0:1 down
网上找了一个master_ip_failover脚本就是用此方法更改VIP:
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[root@localhost app1]# more /usr/local/bin/master_ip_online_change_script
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#!/usr/bin/env perl
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use strict;
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use warnings FATAL => 'all';
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use Getopt::Long;
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my (
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$command, $ssh_user, $orig_master_host, $orig_master_ip,
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$orig_master_port, $new_master_host, $new_master_ip, $new_master_port
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);
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my $vip = '192.168.6.66/24'; # Virtual IP
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my $key = "1";
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my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
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my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
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GetOptions(
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'command=s' => \$command,
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'ssh_user=s' => \$ssh_user,
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'orig_master_host=s' => \$orig_master_host,
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'orig_master_ip=s' => \$orig_master_ip,
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'orig_master_port=i' => \$orig_master_port,
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'new_master_host=s' => \$new_master_host,
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'new_master_ip=s' => \$new_master_ip,
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'new_master_port=i' => \$new_master_port,
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);
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exit &main();
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sub main {
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print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";
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if ( $command eq "stop" || $command eq "stopssh" ) {
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# $orig_master_host, $orig_master_ip, $orig_master_port are passed.
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# If you manage master ip address at global catalog database,
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# invalidate orig_master_ip here.
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my $exit_code = 1;
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eval {
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print "Disabling the VIP on old master: $orig_master_host \n";
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&stop_vip();
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$exit_code = 0;
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};
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if ($@) {
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warn "Got Error: $@\n";
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exit $exit_code;
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}
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exit $exit_code;
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}
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elsif ( $command eq "start" ) {
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# all arguments are passed.
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# If you manage master ip address at global catalog database,
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# activate new_master_ip here.
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# You can also grant write access (create user, set read_only=0, etc) here.
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my $exit_code = 10;
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eval {
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print "Enabling the VIP - $vip on the new master - $new_master_host \n";
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&start_vip();
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$exit_code = 0;
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};
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if ($@) {
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warn $@;
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exit $exit_code;
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}
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exit $exit_code;
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}
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elsif ( $command eq "status" ) {
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print "Checking the Status of the script.. OK \n";
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`ssh $ssh_user\@cluster1 \" $ssh_start_vip \"`;
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exit 0;
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}
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else {
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&usage();
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exit 1;
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}
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}
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# A simple system call that enable the VIP on the new master
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sub start_vip() {
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`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
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}
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# A simple system call that disable the VIP on the old_master
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sub stop_vip() {
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`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
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}
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sub usage {
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print
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"Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=po
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rt\n";
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}
将此脚本复制两次到/usr/local/bin, 分别命名为master_ip_failover 和master_ip_online_change_script
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然后将/etc/app1.cnf 中下面两行注释去掉:
master_ip_failover_script=/usr/local/bin/master_ip_failover
master_ip_online_change_script=/usr/local/bin/master_ip_online_change_script
实验
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1.主库(115)添加一个vip
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[root@node2 .ssh]# /sbin/ifconfig eth0:1 192.168.6.66/24
[root@node2 .ssh]# ip a
1: lo: mtu 16436 qdisc noqueue
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: mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 08:00:27:03:1b:a1 brd ff:ff:ff:ff:ff:ff
inet 192.168.6.115/24 brd 192.168.6.255 scope global eth0
inet 192.168.6.66/24brd 192.168.6.255 scope global secondary eth0:1
inet6 fe80::a00:27ff:fe03:1ba1/64 scope link
valid_lft forever preferred_lft forever
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2.关闭主库MySQL
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[root@node2 .ssh]# /etc/init.d/mysqld stop
Stopping mysqld: [ OK ]
[root@node2 .ssh]# ip a
1: lo: mtu 16436 qdisc noqueue
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: mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 08:00:27:03:1b:a1 brd ff:ff:ff:ff:ff:ff
inet 192.168.6.115/24 brd 192.168.6.255 scope global eth0 ---vip飘走了
inet6 fe80::a00:27ff:fe03:1ba1/64 scope link
valid_lft forever preferred_lft forever
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3 查看newmaster(114)的ip ----vip已飘到new master上了
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[root@node1 ~]# ip a
1: lo: mtu 16436 qdisc noqueue
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: mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 08:00:27:7a:c6:9c brd ff:ff:ff:ff:ff:ff
inet 192.168.6.114/24 brd 192.168.6.255 scope global eth0
inet 192.168.6.66/24brd 192.168.6.255 scope global secondary eth0:1
inet6 fe80::a00:27ff:fe7a:c69c/64 scope link
valid_lft forever preferred_lft forever
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4 重构mysql.重启mha监控
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5 关闭114mysql,vip飘回115上去了
网站名称:【Mysql】MHA配置虚拟ip
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