数据库架构：一主两从
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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
一、修改master_ip_online_change内容
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#!/usr/bin/env perl
# Copyright (C) 2011 DeNA Co.,Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
use
strict;
use
warnings FATAL =>
'all'
;
use
Getopt::Long
qw(:config pass_through)
;
use
Pod::Usage;
use
MHA::MasterMonitor;
use
MHA::MasterFailover;
use
MHA::MasterRotate;
use
MHA::ManagerConst;
my
$master_state
=
""
;
my
$help
;
my
$version
;
$| = 1;
GetOptions(
'help'
=> \
$help
,
'version'
=> \
$version
,
'master_state=s'
=> \
$master_state
);
my
$exit_code
= 1;
if
(
$version
) {
print
"masterha_master_switch version $MHA::ManagerConst::VERSION.\n"
;
exit
0;
}
if
(
$help
) {
pod2usage(0);
}
if
(
$master_state
eq
"dead"
) {
$exit_code
= MHA::MasterFailover::main(
@ARGV
);
}
elsif
(
$master_state
eq
"alive"
) {
$exit_code
= MHA::MasterRotate::main(
@ARGV
);
}
else
{
pod2usage(1);
}
exit
$exit_code
;
# ############################################################################
# Documentation
# ############################################################################
=pod
=head1 NAME
masterha_master_switch - Switching MySQL master server to one of other slave servers
=head1 SYNOPSIS
# For master failover
masterha_master_switch --master_state=dead --global_conf=/etc/masterha_default.cnf --conf=/usr/local/masterha/conf/app1.cnf --dead_master_host=host1
# For online master switch
masterha_master_switch --master_state=alive --global_conf=/etc/masterha_default.cnf --conf=/usr/local/masterha/conf/app1.cnf
See online reference (http://code.google.com/p/mysql-master-ha/wiki/masterha_master_switch) for details.
=head1 DESCRIPTION
See online reference (http://code.google.com/p/mysql-master-ha/wiki/masterha_master_switch) for details.
[root@manager MHA]#
[root@manager MHA]#
[root@manager MHA]# cat /usr/local/bin/master_ip_online_change
#!/usr/bin/env perl
# Copyright (C) 2011 DeNA Co.,Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
## Note: This is a sample script and is not complete. Modify the script based on your environment.
use strict;
use warnings FATAL => 'all';
use Getopt::Long;
use MHA::DBHelper;
use MHA::NodeUtil;
use Time::HiRes qw( sleep gettimeofday tv_interval );
use Data::Dumper;
my $_tstart;
my $_running_interval = 0.1;
my (
$command, $orig_master_is_new_slave, $orig_master_host,
$orig_master_ip, $orig_master_port, $orig_master_user,
$orig_master_password, $orig_master_ssh_user, $new_master_host,
$new_master_ip, $new_master_port, $new_master_user,
$new_master_password, $new_master_ssh_user,
);
GetOptions(
'command=s' => \$command,
'orig_master_is_new_slave' => \$orig_master_is_new_slave,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'orig_master_user=s' => \$orig_master_user,
'orig_master_password=s' => \$orig_master_password,
'orig_master_ssh_user=s' => \$orig_master_ssh_user,
'new_master_host=s' => \$new_master_host,
'new_master_ip=s' => \$new_master_ip,
'new_master_port=i' => \$new_master_port,
'new_master_user=s' => \$new_master_user,
'new_master_password=s' => \$new_master_password,
'new_master_ssh_user=s' => \$new_master_ssh_user,
);
exit &main();
sub current_time_us {
my ( $sec, $microsec ) = gettimeofday();
my $curdate = localtime($sec);
return $curdate . " " . sprintf( "%06d", $microsec );
}
sub sleep_until {
my $elapsed = tv_interval($_tstart);
if ( $_running_interval > $elapsed ) {
sleep( $_running_interval - $elapsed );
}
}
sub get_threads_util {
my $dbh = shift;
my $my_connection_id = shift;
my $running_time_threshold = shift;
my $type = shift;
$running_time_threshold = 0 unless ($running_time_threshold);
$type = 0 unless ($type);
my @threads;
my $sth = $dbh->prepare("SHOW PROCESSLIST");
$sth->execute();
while ( my $ref = $sth->fetchrow_hashref() ) {
my $id = $ref->{Id};
my $user = $ref->{User};
my $host = $ref->{Host};
my $command = $ref->{Command};
my $state = $ref->{State};
my $query_time = $ref->{Time};
my $info = $ref->{Info};
$info =~ s/^\s*(.*?)\s*$/$1/ if defined($info);
next if ( $my_connection_id == $id );
next if ( defined($query_time) && $query_time < $running_time_threshold );
next if ( defined($command) && $command eq "Binlog Dump" );
next if ( defined($user) && $user eq "system user" );
next
if ( defined($command)
&& $command eq "Sleep"
&& defined($query_time)
&& $query_time >= 1 );
if ( $type >= 1 ) {
next if ( defined($command) && $command eq "Sleep" );
next if ( defined($command) && $command eq "Connect" );
}
if ( $type >= 2 ) {
next if ( defined($info) && $info =~ m/^select/i );
next if ( defined($info) && $info =~ m/^show/i );
}
push @threads, $ref;
}
return @threads;
}
sub main {
if ( $command eq "stop" ) {
## Gracefully killing connections on the current master
# 1. Set read_only= 1 on the new master
# 2. DROP USER so that no app user can establish new connections
# 3. Set read_only= 1 on the current master
# 4. Kill current queries
# * Any database access failure will result in script die.
my $exit_code = 1;
eval {
## Setting read_only=1 on the new master (to avoid accident)
my $new_master_handler = new MHA::DBHelper();
# args: hostname, port, user, password, raise_error(die_on_error)_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
$new_master_user, $new_master_password, 1 );
print current_time_us() . " Set read_only on the new master.. ";
$new_master_handler->enable_read_only();
if ( $new_master_handler->is_read_only() ) {
print "ok.\n";
}
else {
die "Failed!\n";
}
$new_master_handler->disconnect();
# Connecting to the orig master, die if any database error happens
my $orig_master_handler = new MHA::DBHelper();
$orig_master_handler->connect( $orig_master_ip, $orig_master_port,
$orig_master_user, $orig_master_password, 1 );
## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
$orig_master_handler->disable_log_bin_local();
print current_time_us() . " Drpping app user on the orig master..\n";
#FIXME_xxx_drop_app_user($orig_master_handler);
## Waiting for N * 100 milliseconds so that current connections can exit
my $time_until_read_only = 15;
$_tstart = [gettimeofday];
my @threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
while ( $time_until_read_only > 0 && $#threads >= 0 ) {
if ( $time_until_read_only % 5 == 0 ) {
printf
"%s Waiting all running %d threads are disconnected.. (max %d milliseconds)\n",
current_time_us(), $#threads + 1, $time_until_read_only * 100;
if ( $#threads < 5 ) {
print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
foreach (@threads);
}
}
sleep_until();
$_tstart = [gettimeofday];
$time_until_read_only--;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
}
## Setting read_only=1 on the current master so that nobody(except SUPER) can write
print current_time_us() . " Set read_only=1 on the orig master.. ";
$orig_master_handler->enable_read_only();
if ( $orig_master_handler->is_read_only() ) {
print "ok.\n";
}
else {
die "Failed!\n";
}
## Waiting for M * 100 milliseconds so that current update queries can complete
my $time_until_kill_threads = 5;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
while ( $time_until_kill_threads > 0 && $#threads >= 0 ) {
if ( $time_until_kill_threads % 5 == 0 ) {
printf
"%s Waiting all running %d queries are disconnected.. (max %d milliseconds)\n",
current_time_us(), $#threads + 1, $time_until_kill_threads * 100;
if ( $#threads < 5 ) {
print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
foreach (@threads);
}
}
sleep_until();
$_tstart = [gettimeofday];
$time_until_kill_threads--;
@threads = get_threads_util( $orig_master_handler->{dbh},
$orig_master_handler->{connection_id} );
}
## Terminating all threads
print current_time_us() . " Killing all application threads..\n";
$orig_master_handler->kill_threads(@threads) if ( $#threads >= 0 );
print current_time_us() . " done.\n";
$orig_master_handler->enable_log_bin_local();
$orig_master_handler->disconnect();
## After finishing the script, MHA executes FLUSH TABLES WITH READ LOCK
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "start" ) {
## Activating master ip on the new master
# 1. Create app user with write privileges
# 2. Moving backup script if needed
# 3. Register new master's ip to the catalog database
# We don't return error even though activating updatable accounts/ip failed so that we don't interrupt slaves' recovery.
# If exit code is 0 or 10, MHA does not abort
my $exit_code = 10;
eval {
my $new_master_handler = new MHA::DBHelper();
# args: hostname, port, user, password, raise_error_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
$new_master_user, $new_master_password, 1 );
## Set read_only=0 on the new master
$new_master_handler->disable_log_bin_local();
print current_time_us() . " Set read_only=0 on the new master.\n";
$new_master_handler->disable_read_only();
## Creating an app user on the new master
print current_time_us() . " Creating app user on the new master..\n";
FIXME_xxx_create_app_user($new_master_handler);
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
# do nothing
exit 0;
}
else {
&usage();
exit 1;
}
}
sub usage {
print
"Usage: master_ip_online_change --command=start|stop|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
die;
}
|
二、停止MHA监控程序
1 |
masterha_stop --conf=
/etc/masterha/app1
.cnf
|
三、手工停止主库MySQL进程，模拟故障发生
mysqladmin -uroot -pmysql shutdown
四、手工故障切换
masterha_master_switch --conf=/etc/masterha/app1.cnf --master_state=dead --dead_master_host=192.168.8.57 --dead_master_port=3306 --new_master_host=192.168.8.58 --new_master_port=3306 --ignore_last_failover
--dead_master_ip=is not set. Using 192.168.8.57. Fri Oct 26 16:18:05 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Fri Oct 26 16:18:05 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Fri Oct 26 16:18:05 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Fri Oct 26 16:18:05 2018 - [info] MHA::MasterFailover version 0.58. Fri Oct 26 16:18:05 2018 - [info] Starting master failover. Fri Oct 26 16:18:05 2018 - [info] Fri Oct 26 16:18:05 2018 - [info] * Phase 1: Configuration Check Phase.. Fri Oct 26 16:18:05 2018 - [info] Fri Oct 26 16:18:07 2018 - [info] GTID failover mode = 1 Fri Oct 26 16:18:07 2018 - [info] Dead Servers: Fri Oct 26 16:18:07 2018 - [info] 192.168.8.57(192.168.8.57:3306) Fri Oct 26 16:18:07 2018 - [info] Checking master reachability via MySQL(double check)... Fri Oct 26 16:18:07 2018 - [info] ok. Fri Oct 26 16:18:07 2018 - [info] Alive Servers: Fri Oct 26 16:18:07 2018 - [info] 192.168.8.58(192.168.8.58:3306) Fri Oct 26 16:18:07 2018 - [info] 192.168.8.59(192.168.8.59:3306) Fri Oct 26 16:18:07 2018 - [info] Alive Slaves: Fri Oct 26 16:18:07 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Fri Oct 26 16:18:07 2018 - [info] GTID ON Fri Oct 26 16:18:07 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Fri Oct 26 16:18:07 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Fri Oct 26 16:18:07 2018 - [info] GTID ON Fri Oct 26 16:18:07 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Master 192.168.8.57(192.168.8.57:3306) is dead. Proceed? (yes/NO): yes Fri Oct 26 16:18:14 2018 - [info] Starting GTID based failover. Fri Oct 26 16:18:14 2018 - [info] Fri Oct 26 16:18:14 2018 - [info] ** Phase 1: Configuration Check Phase completed. Fri Oct 26 16:18:14 2018 - [info] Fri Oct 26 16:18:14 2018 - [info] * Phase 2: Dead Master Shutdown Phase.. Fri Oct 26 16:18:14 2018 - [info] Fri Oct 26 16:18:14 2018 - [info] HealthCheck: SSH to 192.168.8.57 is reachable. Fri Oct 26 16:18:15 2018 - [info] Forcing shutdown so that applications never connect to the current master.. Fri Oct 26 16:18:15 2018 - [info] Executing master IP deactivation script: Fri Oct 26 16:18:15 2018 - [info] /usr/local/bin/master_ip_failover --orig_master_host=192.168.8.57 --orig_master_ip=192.168.8.57 --orig_master_port=3306 --command=stopssh --ssh_user=root Fri Oct 26 16:18:15 2018 - [info] done. Fri Oct 26 16:18:15 2018 - [warning] shutdown_script is not set. Skipping explicit shutting down of the dead master. Fri Oct 26 16:18:15 2018 - [info] * Phase 2: Dead Master Shutdown Phase completed. Fri Oct 26 16:18:15 2018 - [info] Fri Oct 26 16:18:15 2018 - [info] * Phase 3: Master Recovery Phase.. Fri Oct 26 16:18:15 2018 - [info] Fri Oct 26 16:18:15 2018 - [info] * Phase 3.1: Getting Latest Slaves Phase.. Fri Oct 26 16:18:15 2018 - [info] Fri Oct 26 16:18:15 2018 - [info] The latest binary log file/position on all slaves is mysql-bin.000012:359 Fri Oct 26 16:18:15 2018 - [info] Retrieved Gtid Set: a92f70a4-d5ea-11e8-af28-080027c0450d:10 Fri Oct 26 16:18:15 2018 - [info] Latest slaves (Slaves that received relay log files to the latest): Fri Oct 26 16:18:15 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Fri Oct 26 16:18:15 2018 - [info] GTID ON Fri Oct 26 16:18:15 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Fri Oct 26 16:18:15 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Fri Oct 26 16:18:15 2018 - [info] GTID ON Fri Oct 26 16:18:15 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Fri Oct 26 16:18:15 2018 - [info] The oldest binary log file/position on all slaves is mysql-bin.000012:359 Fri Oct 26 16:18:15 2018 - [info] Retrieved Gtid Set: a92f70a4-d5ea-11e8-af28-080027c0450d:10 Fri Oct 26 16:18:15 2018 - [info] Oldest slaves: Fri Oct 26 16:18:15 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Fri Oct 26 16:18:15 2018 - [info] GTID ON Fri Oct 26 16:18:15 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Fri Oct 26 16:18:15 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Fri Oct 26 16:18:15 2018 - [info] GTID ON Fri Oct 26 16:18:15 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306) Fri Oct 26 16:18:15 2018 - [info] Fri Oct 26 16:18:15 2018 - [info] * Phase 3.3: Determining New Master Phase.. Fri Oct 26 16:18:15 2018 - [info] Fri Oct 26 16:18:15 2018 - [info] 192.168.8.58 can be new master. Fri Oct 26 16:18:15 2018 - [info] New master is 192.168.8.58(192.168.8.58:3306) Fri Oct 26 16:18:15 2018 - [info] Starting master failover.. Fri Oct 26 16:18
网站题目：MySQL5.7一主两从MHA手工故障切换
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