这篇文章主要介绍“MySQL5.7怎么实现一主两从MHA在线手动平滑切换”，在日常操作中，相信很多人在MySQL5.7怎么实现一主两从MHA在线手动平滑切换问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”MySQL5.7怎么实现一主两从MHA在线手动平滑切换”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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
一、修改master_ip_online_change内容
#!/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
masterha_stop --conf=/etc/masterha/app1.cnf
三、进行平滑切换
masterha_master_switch --conf=/etc/masterha/app1.cnf --master_state=alive --new_master_host=192.168.8.57 --new_master_port=3306 --orig_master_is_new_slave --running_updates_limit=10000
Fri Oct 26 14:17:08 2018 - [info] MHA::MasterRotate version 0.58. Fri Oct 26 14:17:08 2018 - [info] Starting online master switch.. Fri Oct 26 14:17:08 2018 - [info] Fri Oct 26 14:17:08 2018 - [info] * Phase 1: Configuration Check Phase.. Fri Oct 26 14:17:08 2018 - [info] Fri Oct 26 14:17:08 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Fri Oct 26 14:17:08 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf.. Fri Oct 26 14:17:08 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf.. Fri Oct 26 14:17:09 2018 - [info] GTID failover mode = 1 Fri Oct 26 14:17:09 2018 - [info] Current Alive Master: 192.168.8.58(192.168.8.58:3306) Fri Oct 26 14:17:09 2018 - [info] Alive Slaves: Fri Oct 26 14:17:09 2018 - [info] 192.168.8.57(192.168.8.57:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled Fri Oct 26 14:17:09 2018 - [info] GTID ON Fri Oct 26 14:17:09 2018 - [info] Replicating from 192.168.8.58(192.168.8.58:3306) Fri Oct 26 14:17:09 2018 - [info] Primary candidate for the new Master (candidate_master is set) Fri Oct 26 14:17:09 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 14:17:09 2018 - [info] GTID ON Fri Oct 26 14:17:09 2018 - [info] Replicating from 192.168.8.58(192.168.8.58:3306) It is better to execute FLUSH NO_WRITE_TO_BINLOG TABLES on the master before switching. Is it ok to execute on 192.168.8.58(192.168.8.58:3306)? (YES/no): yes Fri Oct 26 14:17:12 2018 - [info] Executing FLUSH NO_WRITE_TO_BINLOG TABLES. This may take long time.. Fri Oct 26 14:17:12 2018 - [info] ok. Fri Oct 26 14:17:12 2018 - [info] Checking MHA is not monitoring or doing failover.. Fri Oct 26 14:17:12 2018 - [info] Checking replication health on 192.168.8.57.. Fri Oct 26 14:17:12 2018 - [info] ok. Fri Oct 26 14:17:12 2018 - [info] Checking replication health on 192.168.8.59.. Fri Oct 26 14:17:12 2018 - [info] ok. Fri Oct 26 14:17:12 2018 - [info] 192.168.8.57 can be new master. Fri Oct 26 14:17:12 2018 - [info] From: 192.168.8.58(192.168.8.58:3306) (current master) +--192.168.8.57(192.168.8.57:3306) +--192.168.8.59(192.168.8.59:3306) To: 192.168.8.57(192.168.8.57:3306) (new master) +--192.168.8.59(192.168.8.59:3306) +--192.168.8.58(192.168.8.58:3306) Starting master switch from 192.168.8.58(192.168.8.58:3306) to 192.168.8.57(192.168.8.57:3306)? (yes/NO): yes Fri Oct 26 14:17:16 2018 - [info] Checking whether 192.168.8.57(192.168.8.57:3306) is ok for the new master.. Fri Oct 26 14:17:16 2018 - [info] ok. Fri Oct 26 14:17:16 2018 - [info] 192.168.8.58(192.168.8.58:3306): SHOW SLAVE STATUS returned empty result. To check replication filtering rules, temporarily executing CHANGE MASTER to a dummy host. Fri Oct 26 14:17:16 2018 - [info] 192.168.8.58(192.168.8.58:3306): Resetting slave pointing to the dummy host. Fri Oct 26 14:17:16 2018 - [info] ** Phase 1: Configuration Check Phase completed. Fri Oct 26 14:17:16 2018 - [info] Fri Oct 26 14:17:16 2018 - [info] * Phase 2: Rejecting updates Phase.. Fri Oct 26 14:17:16 2018 - [info] Fri Oct 26 14:17:16 2018 - [info] Executing master ip online change script to disable write on the current master: Fri Oct 26 14:17:16 2018 - [info] /usr/local/bin/master_ip_online_change --command=stop --orig_master_host=192.168.8.58 --orig_master_ip=192.168.8.58 --orig_master_port=3306 --orig_master_user='root' --new_master_host=192.168.8.57 --new_master_ip=192.168.8.57 --new_master_port=3306 --new_master_user='root' --orig_master_ssh_user=root --new_master_ssh_user=root --orig_master_is_new_slave --orig_master_password=xxx --new_master_password=xxx Fri Oct 26 14:17:16 2018 363856 Set read_only on the new master.. ok. Fri Oct 26 14:17:16 2018 369994 Drpping app user on the orig master.. Fri Oct 26 14:17:16 2018 375886 Waiting all running 2 threads are disconnected.. (max 1500 milliseconds) {'Time' => '12692','db' => undef,'Id' => '2','User' => 'repl','State' => 'Master has sent all binlog to slave; waiting for more updates','Command' => 'Binlog Dump GTID','Info' => undef,'Host' => 'master:38252'} {'Time' => '12637','db' => undef,'Id' => '3','User' => 'repl','State' => 'Master has sent all binlog to slave; waiting for more updates','Command' => 'Binlog Dump GTID','Info' => undef,'Host' => 'slave2:56564'} Fri Oct 26 14:17:16 2018 874083 Waiting all running 2 threads are disconnected.. (max 1000 milliseconds) {'Time' => '12693','db' => undef,'Id' => '2','User' => 'repl','State' => 'Master has sent all binlog to slave; waiting for more updates','Command' => 'Binlog Dump GTID','Info' => undef,'Host' => 'master:38252'} {'Time' => '12638','db' => undef,'Id' => '3','User' => 'repl','State' => 'Master has sent all binlog to slave; waiting for more updates','Command' => 'Binlog Dump GTID','Info' => undef,'Host' => 'slave2:56564'} Fri Oct 26 14:17:17 2018 375241 Waiting all running 2 threads are disconnected.. (max 500 milliseconds) {'Time' => '12693','db' => undef,'Id' => '2','User' => 'repl','State' => 'Master has sent all binlog to slave; waiting for more updates','Command' => 'Binlog Dump GTID','Info' => undef,'Host' => 'master:38252'} {'Time' => '12638','db' => undef,'Id' => '3','User' => 'repl','State' => 'Master has sent all binlog to slave; waiting for more updates','Command' => 'Binlog Dump GTID','Info' => undef,'Host' => 'slave2:56564'} Fri Oct 26 14:17:17 2018 876317 Set read_only=1 on the orig master.. ok. Fri Oct 26 14:17:17 2018 878132 Waiting all running 2 queries are disconnected.. (max 500 milliseconds) {'Time' => '12694','db' => undef,'Id' => '2','User' => 'repl','State' => 'Master has sent all binlog to slave; waiting for more updates','Command' => 'Binlog Dump GTID','Info' => undef,'Host' => 'master:38252'} {'Time' => '12639','db' => undef,'Id' => '3','User' => 'repl','State' => 'Master has sent all binlog to slave; waiting for more updates','Command' => 'Binlog Dump GTID','Info' => undef,'Host' => 'slave2:56564'} Fri Oct 26 14:17:18 2018 380824 Killing all application threads.. Fri Oct 26 14:17:18 2018 383181 done. Fri Oct 26 14:17:18 2018 - [info] ok. Fri Oct 26 14:17:18 2018 - [info] Locking all tables on the orig master to reject updates from everybody (including root): Fri Oct 26 14:17:18 2018 - [info] Executing FLUSH TABLES WITH READ LOCK.. Fri Oct 26 14:17:18 2018 - [info] ok. Fri Oct 26 14:17:18 2018 - [info] Orig master binlog:pos is mysql-bin.000011:400. Fri Oct 26 14:17:18 2018 - [info] Waiting to execute all relay logs on 192.168.8.57(192.168.8.57:3306).. Fri Oct 26 14:17:18 2018 - [info] master_pos_wait(mysql-bin.000011:400) completed on 192.168.8.57(192.168.8.57:3306). Executed 0 events. Fri Oct 26 14:17:18 2018 - [info] done. Fri Oct 26 14:17:18 2018 - [info] Getting new master's binlog name and position.. Fri Oct 26 14:17:18 2018 - [info] mysql-bin.000012:194 Fri Oct 26 14:17:18 2018 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.8.57', MASTER_PORT=3306, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='xxx'; Fri Oct 26 14:17:18 2018 - [info] Executing master ip online change script to allow write on the new master: Fri Oct 26 14:17:18 2018 - [info] /usr/local/bin/master_ip_online_change --command=start --orig_master_host=192.168.8.58 --orig_master_ip=192.168.8.58 --orig_master_port=3306 --orig_master_user='root' --new_master_host=192.168.8.57 --new_master_ip=192.168.8.57 --new_master_port=3306 --new_master_user='root' --orig_master_ssh_user=root --new_master_ssh_user=root --orig_master_is_new_slave --orig_master_password=xxx --new_master_password=xxx Fri Oct 26 14:17:18 2018 735339 Set read_only=0 on the new master. Fri Oct 26 14:17:18 2018 736744 Creating app user on the new master.. Got Error: Undefined subroutine &main::FIXME_xxx_create_app_user called at /usr/local/bin/master_ip_online_change line 246. Fri Oct 26 14:17:18 2018 - [warning] Proceeding. Fri Oct 26 14:17:18 2018 - [info] Fri Oct 26 14:17:18 2018 - [info] * Switching slaves in parallel.. Fri Oct 26 14:17:18 2018 - [info] Fri Oct 26 14:17:18 2018 - [info] -- Slave switch on host 192.168.8.59(192.168.8.59:3306) started, pid: 4255 Fri Oct 26 14:17:18 2018 - [info] Fri Oct 26 14:17:19 2018 - [info] Log messages from 192.168.8.59 ... Fri Oct 26 14:17:19 2018 - [info] Fri Oct 26 14:17:18 2018 - [info] Waiting to execute all relay logs on 192.168.8.59(192.168.8.59:3306).. Fri Oct 26 14:17:18 2018 - [info] master_pos_wait(mysql-bin.000011:400) completed on 192.168.8.59(192.168.8.59:3306). Executed 0 events. Fri Oct 26 14:17:18 2018 - [info] done. Fri Oct 26 14:17:18 2018 - [info] Resetting slave 192.168.8.59(192.168.8.59:3306) and starting replication from the new master 192.168.8.57(192.168.8.57:3306).. Fri Oct 26 14:17:18 2018 - [info] Executed CHANGE MASTER. Fri Oct 26 14:17:18 2018 - [info] Slave started. Fri Oct 26 14:17:19 2018 - [info] End of log messages from 192.168.8.59 ... Fri Oct 26 14:17:19 2018 - [info] Fri Oct 26 14:17:19 2018 - [info] -- Slave switch on host 192.168.8.59(192.168.8.59:3306) succeeded. Fri Oct 26 14:17:19 2018 - [info] Unlocking all tables on the orig master: Fri Oct 26 14:17:19 2018 - [info] Executing UNLOCK TABLES.. Fri Oct 26 14:17:19 2018 - [info] ok. Fri Oct 26 14:17:19 2018 - [info] Starting orig master as a new slave.. Fri Oct 26 14:17:19 2018 - [info] Resetting slave 192.168.8.58(192.168.8.58:3306) and starting replication from the new master 192.168.8.57(192.168.8.57:3306).. Fri Oct 26 14:17:19 2018 - [info] Executed CHANGE MASTER. Fri Oct 26 14:17:20 2018 - [info] Slave started. Fri Oct 26 14:17:20 2018 - [info] All new slave servers switched successfully. Fri Oct 26 14:17:20 2018 - [info] Fri Oct 26 14:17:20 2018 - [info] * Phase 5: New master cleanup phase.. Fri Oct 26 14:17:20 2018 - [info] Fri Oct 26 14:17:20 2018 - [info] 192.168.8.57: Resetting slave info succeeded. Fri Oct 26 14:17:20 2018 - [info] Switching master to 192.168.8.57(192.168.8.57:3306) completed successfully.四、查看主从库状态
192.168.8.57
mysql> show slave status \G Empty set (0.00 sec) mysql> show variables like '%read_only%'; +-----------------------+-------+ | Variable_name | Value | +-----------------------+-------+ | innodb_read_only | OFF | | read_only | OFF | | super_read_only | OFF | | transaction_read_only | OFF | | tx_read_only | OFF | +-----------------------+-------+
该节点已经变成主库，并且read_only已经关闭。
192.168.8.58
mysql> show slave status \G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.8.57 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000012 Read_Master_Log_Pos: 194 Relay_Log_File: slave1-relay-bin.000002 Relay_Log_Pos: 367 Relay_Master_Log_File: mysql-bin.000012 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 194 Relay_Log_Space: 575 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 57 Master_UUID: a92f70a4-d5ea-11e8-af28-080027c0450d Master_Info_File: /mysql/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: a92f70a4-d5ea-11e8-af28-080027c0450d:1-9, a92f70a4-d5ea-11e8-af28-080027c0450f:1-6 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec) mysql> show variables like '%read_only%'; +-----------------------+-------+ | Variable_name | Value | +-----------------------+-------+ | innodb_read_only | OFF | | read_only | ON | | super_read_only | OFF | | transaction_read_only | OFF | | tx_read_only | OFF | +-----------------------+-------+
改节点变成了从库，real_only依然开启。
192.168.8.59
mysql> show slave status \G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.8.57 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000012 Read_Master_Log_Pos: 194 Relay_Log_File: slave2-relay-bin.000002 Relay_Log_Pos: 367 Relay_Master_Log_File: mysql-bin.000012 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 194 Relay_Log_Space: 575 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 57 Master_UUID: a92f70a4-d5ea-11e8-af28-080027c0450d Master_Info_File: /mysql/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: a92f70a4-d5ea-11e8-af28-080027c0450b:1-4, a92f70a4-d5ea-11e8-af28-080027c0450d:1-9, a92f70a4-d5ea-11e8-af28-080027c0450f:1-6 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec) mysql> show variables like '%read_only%'; +-----------------------+-------+ | Variable_name | Value | +-----------------------+-------+ | innodb_read_only | OFF | | read_only | ON | | super_read_only | OFF | | transaction_read_only | OFF | | tx_read_only | OFF | +-----------------------+-------+
该节点依然为从库，read_only参数依然开启。
五、检查主从复制状态
查看三个节点数据库数据状态
mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | | t8 | +----------------+
在192.168.8.57创建测试表
mysql> create table t9(id int(6)); Query OK, 0 rows affected (0.33 sec) mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | | t8 | | t9 | +----------------+
在192.168.8.58查看数据同步情况
mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | | t8 | | t9 | +----------------+
在192.168.8.59查看数据同步情况
mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | | t8 | | t9 | +----------------+
六、重启监控程序并查看MHA状态
masterha_stop --conf=/etc/masterha/app1.cnf /usr/local/bin/masterha_start.sh
查看MHA日志，正常运行
+--192.168.8.59(192.168.8.59:3306) Fri Oct 26 16:10:39 2018 - [info] Checking master_ip_failover_script status: Fri Oct 26 16:10:39 2018 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.8.57 --orig_master_ip=192.168.8.57 --orig_master_port=3306 Fri Oct 26 16:10:39 2018 - [info] OK. Fri Oct 26 16:10:39 2018 - [warning] shutdown_script is not defined. Fri Oct 26 16:10:39 2018 - [info] Set master ping interval 1 seconds. Fri Oct 26 16:10:39 2018 - [info] Set secondary check script: /usr/local/bin/masterha_secondary_check -s 192.168.8.57 -s 192.168.8.59 Fri Oct 26 16:10:39 2018 - [info] Starting ping health check on 192.168.8.57(192.168.8.57:3306).. Fri Oct 26 16:10:39 2018 - [info] Ping(SELECT) succeeded, waiting until MySQL doesn't respond..
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