MySQL5.7一主两从MHA手工故障切换
发布时间：2022-04-01 11:11:12 所属栏目：MySql教程 来源：互联网
导读：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 # Copy
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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 { "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=portn"; 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=<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 16:18:15 2018 - [info] From: 192.168.8.57(192.168.8.57:3306) (current master) +--192.168.8.58(192.168.8.58:3306) +--192.168.8.59(192.168.8.59:3306) To: 192.168.8.58(192.168.8.58:3306) (new master) +--192.168.8.59(192.168.8.59:3306) Starting master switch from 192.168.8.57(192.168.8.57:3306) to 192.168.8.58(192.168.8.58:3306)? (yes/NO): yes Fri Oct 26 16:18:22 2018 - [info] New master decided manually is 192.168.8.58(192.168.8.58:3306) Fri Oct 26 16:18:22 2018 - [info] Fri Oct 26 16:18:22 2018 - [info] * Phase 3.3: New Master Recovery Phase.. Fri Oct 26 16:18:22 2018 - [info] Fri Oct 26 16:18:22 2018 - [info] Waiting all logs to be applied.. Fri Oct 26 16:18:22 2018 - [info] done. Fri Oct 26 16:18:22 2018 - [info] Getting new master's binlog name and position.. Fri Oct 26 16:18:22 2018 - [info] mysql-bin.000011:565 Fri Oct 26 16:18:22 2018 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.8.58', MASTER_PORT=3306, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='xxx'; Fri Oct 26 16:18:22 2018 - [info] Master Recovery succeeded. File:Pos:Exec_Gtid_Set: mysql-bin.000011, 565, a92f70a4-d5ea-11e8-af28-080027c0450d:1-10, a92f70a4-d5ea-11e8-af28-080027c0450f:1-6 Fri Oct 26 16:18:22 2018 - [info] Executing master IP activate script: Fri Oct 26 16:18:22 2018 - [info] /usr/local/bin/master_ip_failover --command=start --ssh_user=root --orig_master_host=192.168.8.57 --orig_master_ip=192.168.8.57 --orig_master_port=3306 --new_master_host=192.168.8.58 --new_master_ip=192.168.8.58 --new_master_port=3306 --new_master_user='root' --new_master_password=xxx Set read_only=0 on the new master. Creating app user on the new master.. Undefined subroutine &main::FIXME_xxx_create_user called at /usr/local/bin/master_ip_failover line 94. Fri Oct 26 16:18:22 2018 - [error][/usr/lib/perl5/vendor_perl/MHA/MasterFailover.pm, ln1612] Failed to activate master IP address for 192.168.8.58(192.168.8.58:3306) with return code 10:0 Fri Oct 26 16:18:22 2018 - [warning] Proceeding. Fri Oct 26 16:18:22 2018 - [info] ** Finished master recovery successfully. Fri Oct 26 16:18:22 2018 - [info] * Phase 3: Master Recovery Phase completed. Fri Oct 26 16:18:22 2018 - [info] Fri Oct 26 16:18:22 2018 - [info] * Phase 4: Slaves Recovery Phase.. Fri Oct 26 16:18:22 2018 - [info] Fri Oct 26 16:18:22 2018 - [info] Fri Oct 26 16:18:22 2018 - [info] * Phase 4.1: Starting Slaves in parallel.. Fri Oct 26 16:18:22 2018 - [info] Fri Oct 26 16:18:22 2018 - [info] -- Slave recovery on host 192.168.8.59(192.168.8.59:3306) started, pid: 5792. Check tmp log /var/log/masterha/app1/192.168.8.59_3306_20181026161805.log if it takes time.. Fri Oct 26 16:18:23 2018 - [info] Fri Oct 26 16:18:23 2018 - [info] Log messages from 192.168.8.59 ... Fri Oct 26 16:18:23 2018 - [info] Fri Oct 26 16:18:22 2018 - [info] Resetting slave 192.168.8.59(192.168.8.59:3306) and starting replication from the new master 192.168.8.58(192.168.8.58:3306).. Fri Oct 26 16:18:22 2018 - [info] Executed CHANGE MASTER. Fri Oct 26 16:18:22 2018 - [info] Slave started. Fri Oct 26 16:18:22 2018 - [info] gtid_wait(a92f70a4-d5ea-11e8-af28-080027c0450d:1-10, a92f70a4-d5ea-11e8-af28-080027c0450f:1-6) completed on 192.168.8.59(192.168.8.59:3306). Executed 0 events. Fri Oct 26 16:18:23 2018 - [info] End of log messages from 192.168.8.59. Fri Oct 26 16:18:23 2018 - [info] -- Slave on host 192.168.8.59(192.168.8.59:3306) started. Fri Oct 26 16:18:23 2018 - [info] All new slave servers recovered successfully. Fri Oct 26 16:18:23 2018 - [info] Fri Oct 26 16:18:23 2018 - [info] * Phase 5: New master cleanup phase.. Fri Oct 26 16:18:23 2018 - [info] Fri Oct 26 16:18:23 2018 - [info] Resetting slave info on the new master.. Fri Oct 26 16:18:23 2018 - [info] 192.168.8.58: Resetting slave info succeeded. Fri Oct 26 16:18:23 2018 - [info] Master failover to 192.168.8.58(192.168.8.58:3306) completed successfully. Fri Oct 26 16:18:23 2018 - [info] ----- Failover Report ----- app1: MySQL Master failover 192.168.8.57(192.168.8.57:3306) to 192.168.8.58(192.168.8.58:3306) succeeded Master 192.168.8.57(192.168.8.57:3306) is down! Check MHA Manager logs at manager for details. Started manual(interactive) failover. Invalidated master IP address on 192.168.8.57(192.168.8.57:3306) Selected 192.168.8.58(192.168.8.58:3306) as a new master. 192.168.8.58(192.168.8.58:3306): OK: Applying all logs succeeded. Failed to activate master IP address for 192.168.8.58(192.168.8.58:3306) with return code 10:0 192.168.8.59(192.168.8.59:3306): OK: Slave started, replicating from 192.168.8.58(192.168.8.58:3306) 192.168.8.58(192.168.8.58:3306): Resetting slave info succeeded. Master failover to 192.168.8.58(192.168.8.58:3306) completed successfully. Fri Oct 26 16:18:23 2018 - [info] Sending mail.. 五、查看数据库状态 192.168.8.58 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 | +-----------------------+-------+ 当前节点变成主库，slave进程停止，只读模式关闭 192.168.8.59 mysql> show slave status G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.8.58 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000011 Read_Master_Log_Pos: 565 Relay_Log_File: slave2-relay-bin.000002 Relay_Log_Pos: 414 Relay_Master_Log_File: mysql-bin.000011 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: 565 Relay_Log_Space: 622 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: 58 Master_UUID: a92f70a4-d5ea-11e8-af28-080027c0450f 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:1-10, 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 | +-----------------------+-------+ 此节点主库变成192.168.8.58，只读模式不变 六、查看复制状态 当前主库和从库数据状态 mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | | t8 | | t9 | +----------------+ 在主库192.168.8.58创建测试表 mysql> create table t10 (id int(6)); Query OK, 0 rows affected (0.35 sec) mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t10 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | | t8 | | t9 | +----------------+ 在从库192.168.8.59查看数据同步情况 mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t1 | | t10 | | t2 | | t3 | | t4 | | t5 | | t6 | | t7 | | t8 | | t9 | +----------------+ 测试表t10已经同步，复制正常。 （编辑：永州站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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