os:centos 7.4
mysql: 5.7
mha: 0.58
这一篇blog介绍下 master_ip_online_change 的设置。
ip 规划如下：
192.168.56.101 node1 (mha manager)
192.168.56.102 node2 (mysql master)
192.168.56.103 node3 (mysql master candicate)
192.168.56.104 node4 (mysql slave)
master 的 vip 192.168.56.100/24
mha 提供快速切换(switchover)和优雅的阻塞写入，这个切换过程只需要 0.5-2s 的时间，这段时间内数据是无法写入的。
在很多情况下，0.5-2s 的阻塞写入是可以接受的。
因此切换主服务器不需要计划分配维护时间窗口。
master_ip_online_change参数
mha manager 节点上
# vi /etc/masterha/app1.cnf
#手动switchover时候的切换脚本
master_ip_online_change_script= /usr/local/bin/master_ip_online_changemaster_ip_online_change_script 指的是手动执行mysql master switchover时执行的切换脚本。
没有使用 keepalived ，通过脚本的方式管理vip。
# cp /usr/local/bin/master_ip_online_change /usr/local/bin/master_ip_online_change.bak
# vi /usr/local/bin/master_ip_online_change
#!/usr/bin/env perl
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,
);
my $vip = '192.168.56.100';
my $brdc = '192.168.56.255';
my $ifdev = 'enp0s8';
my $key = '1';
my $ssh_start_vip = "/usr/sbin/ip addr add $vip/24 brd $brdc dev $ifdev label $ifdev:$key;/usr/sbin/arping -q -A -c 1 -I $ifdev $vip;iptables -F;";
my $ssh_stop_vip = "/usr/sbin/ip addr del $vip/24 dev $ifdev label $ifdev:$key";
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} );
}
print "Disabling the VIP on old master: $orig_master_host /n";
&stop_vip();
## 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
print "Enabling the VIP - $vip on the new master - $new_master_host /n";
&start_vip();
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@/n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
# do nothing
exit 0;
}
else {
&usage();
exit 1;
}
}
# A simple system call that enable the VIP on the new master
sub start_vip() {
`ssh $new_master_ssh_user/@$new_master_host /" $ssh_start_vip /"`;
}
# A simple system call that disable the VIP on the old_master
sub stop_vip() {
`ssh $orig_master_ssh_user/@$orig_master_host /" $ssh_stop_vip /"`;
}
sub usage {
print
"Usage: master_ip_online_change --command=start|stop|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --orig_master_user=user --orig_master_password=password --orig_master_ssh_user=sshuser --new_master_host=host --new_master_ip=ip --new_master_port=port --new_master_user=user --new_master_password=password --new_master_ssh_user=sshuser /n";
die;
}更换ip后，一定要执行下 arping
验证 switchover (online change)
手动切换之前必须先停止 mha manager。
关闭 mha manager
关闭 manager
# masterha_stop --conf=/etc/masterha/app1.cnf查看 manager status
# masterha_check_status --conf=/etc/masterha/app1.cnf查看 manager log
# tail -n 1000 -f /var/log/masterha/app1-manager.log检查复制环境ssh
# masterha_check_ssh --conf=/etc/masterha/app1.cnf 检查整个复制环境
# masterha_check_repl --conf=/etc/masterha/app1.cnf手动执行
node2 目前是 master,node3 是 node2 的 slave，
需要将 node3 提升为 master，node2 为 node3 的 slave。
# masterha_master_switch --conf=/etc/masterha/app1.cnf --master_state=alive --orig_master_is_new_slave --new_master_host=192.168.56.103 --new_master_port=3306 --running_updates_limit=10000
Tue Aug 7 09:33:42 2018 - [info] * Phase 1: Configuration Check Phase..
Tue Aug 7 09:34:05 2018 - [info] ** Phase 1: Configuration Check Phase completed.
Tue Aug 7 09:34:05 2018 - [info] * Phase 2: Rejecting updates Phase..
Tue Aug 7 09:34:05 2018 - [info] Executing master ip online change script to allow write on the new master:
Tue Aug 7 09:34:05 2018 - [info] /usr/local/bin/master_ip_online_change --command=start --orig_master_host=192.168.56.102 --orig_master_ip=192.168.56.102 --orig_master_port=3306 --orig_master_user='mha_mon' --new_master_host=192.168.56.103 --new_master_ip=192.168.56.103 --new_master_port=3306 --new_master_user='mha_mon' --orig_master_ssh_user=root --new_master_ssh_user=root --orig_master_is_new_slave --orig_master_password=xxx --new_master_password=xxx
Tue Aug 7 09:34:06 2018 - [info] Executed CHANGE MASTER.
Tue Aug 7 09:34:06 2018 - [info] Starting orig master as a new slave..
Tue Aug 7 09:34:06 2018 - [info] Resetting slave 192.168.56.102(192.168.56.102:3306) and starting replication from the new master 192.168.56.103(192.168.56.103:3306)..
Tue Aug 7 09:34:07 2018 - [info] Executed CHANGE MASTER.
Tue Aug 7 09:34:07 2018 - [info] Slave started.
Tue Aug 7 09:34:07 2018 - [info] All new slave servers switched successfully.
Tue Aug 7 09:34:07 2018 - [info]
Tue Aug 7 09:34:07 2018 - [info] * Phase 5: New master cleanup phase..
Tue Aug 7 09:34:07 2018 - [info]
Tue Aug 7 09:34:07 2018 - [info] 192.168.56.103: Resetting slave info succeeded.
Tue Aug 7 09:34:07 2018 - [info] Switching master to 192.168.56.103(192.168.56.103:3306) completed successfully上面的日志时挑选了一些关键信息，完整的日志输出在后面。
查看 node3 的信息
# ifconfig enp0s8:1
enp0s8:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.56.100 netmask 255.255.255.0 broadcast 192.168.56.255
ether 08:00:27:e8:24:31 txqueuelen 1000 (Ethernet)
mysql> show processlist;
+----+------------+-------------+------+-------------+------+---------------------------------------------------------------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------------+-------------+------+-------------+------+---------------------------------------------------------------+------------------+
| 2 | root | localhost | NULL | Query | 0 | starting | show processlist |
| 17 | replicator | node4:57638 | NULL | Binlog Dump | 524 | Master has sent all binlog to slave; waiting for more updates | NULL |
| 18 | replicator | node2:55922 | NULL | Binlog Dump | 523 | Master has sent all binlog to slave; waiting for more updates | NULL |
+----+------------+-------------+------+-------------+------+---------------------------------------------------------------+------------------+
3 rows in set (0.00 sec)
查看 node2 的 mysql slave status
mysql> show slave status/G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.103
Master_User: replicator
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000008
Read_Master_Log_Pos: 154
Relay_Log_File: node2-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000008
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
查看 node4 的 mysql slave status
mysql> show slave status/G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.103
Master_User: replicator
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000008
Read_Master_Log_Pos: 154
Relay_Log_File: node4-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000008
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
完美!
启动 mha manager
switchover成功后，修改/etc/masterha/app1.cnf，然后再启动 mha manager
启动 manager
# nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1-manager.log 2>&1 & 查看 manager status
# masterha_check_status --conf=/etc/masterha/app1.cnf查看 manager log
# tail -n 1000 -f /var/log/masterha/app1-manager.logvip 的一些操作
# ip addr add 192.168.56.100/24 brd 192.168.56.255 dev enp0s8 label enp0s8:1
# /usr/sbin/arping -q -A -c 1 -I enp0s8 192.168.56.100
# ip addr del 192.168.56.100/24 dev enp0s8 label enp0s8:1slave 的设置
mysql> change master to
master_host='192.168.56.102',
master_user='replicator',
master_password='2wsx3edc',
master_port=3306,
master_log_file='mysql-bin.000007',
master_log_pos=154;
mysql> start slave; switchover的过程，基本为以下步骤：
1.检测复制设置和确定当前主服务器
2.确定新的主服务器
3.阻塞写入到当前主服务器
4.等待所有从服务器赶上复制
5.授予写入到新的主服务器
6.重新设置从服务器
下面是完整日志输出
# masterha_master_switch --conf=/etc/masterha/app1.cnf --master_state=alive --orig_master_is_new_slave --new_master_host=192.168.56.103 --new_master_port=3306 --running_updates_limit=10000
Tue Aug 7 09:33:42 2018 - [info] MHA::MasterRotate version 0.58.
Tue Aug 7 09:33:42 2018 - [info] Starting online master switch..
Tue Aug 7 09:33:42 2018 - [info]
Tue Aug 7 09:33:42 2018 - [info] * Phase 1: Configuration Check Phase..
Tue Aug 7 09:33:42 2018 - [info]
Tue Aug 7 09:33:42 2018 - [info] Reading default configuration from /etc/masterha_default.cnf..
Tue Aug 7 09:33:42 2018 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Tue Aug 7 09:33:42 2018 - [info] Reading server configuration from /etc/masterha/app1.cnf..
Tue Aug 7 09:33:43 2018 - [info] GTID failover mode = 0
Tue Aug 7 09:33:43 2018 - [info] Current Alive Master: 192.168.56.102(192.168.56.102:3306)
Tue Aug 7 09:33:43 2018 - [info] Alive Slaves:
Tue Aug 7 09:33:43 2018 - [info] 192.168.56.103(192.168.56.103:3306) Version=5.7.22-log (oldest major version between slaves) log-bin:enabled
Tue Aug 7 09:33:43 2018 - [info] Replicating from 192.168.56.102(192.168.56.102:3306)
Tue Aug 7 09:33:43 2018 - [info] Primary candidate for the new Master (candidate_master is set)
Tue Aug 7 09:33:43 2018 - [info] 192.168.56.104(192.168.56.104:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Tue Aug 7 09:33:43 2018 - [info] Replicating from 192.168.56.102(192.168.56.102:3306)
It is better to execute FLUSH NO_WRITE_TO_BINLOG TABLES on the master before switching. Is it ok to execute on 192.168.56.102(192.168.56.102:3306)? (YES/no): yes
Tue Aug 7 09:33:55 2018 - [info] Executing FLUSH NO_WRITE_TO_BINLOG TABLES. This may take long time..
Tue Aug 7 09:33:55 2018 - [info] ok.
Tue Aug 7 09:33:55 2018 - [info] Checking MHA is not monitoring or doing failover..
Tue Aug 7 09:33:55 2018 - [info] Checking replication health on 192.168.56.103..
Tue Aug 7 09:33:55 2018 - [info] ok.
Tue Aug 7 09:33:55 2018 - [info] Checking replication health on 192.168.56.104..
Tue Aug 7 09:33:55 2018 - [info] ok.
Tue Aug 7 09:33:55 2018 - [info] 192.168.56.103 can be new master.
Tue Aug 7 09:33:55 2018 - [info]
From:
192.168.56.102(192.168.56.102:3306) (current master)
+--192.168.56.103(192.168.56.103:3306)
+--192.168.56.104(192.168.56.104:3306)
To:
192.168.56.103(192.168.56.103:3306) (new master)
+--192.168.56.104(192.168.56.104:3306)
+--192.168.56.102(192.168.56.102:3306)
Starting master switch from 192.168.56.102(192.168.56.102:3306) to 192.168.56.103(192.168.56.103:3306)? (yes/NO): yes
Tue Aug 7 09:34:05 2018 - [info] Checking whether 192.168.56.103(192.168.56.103:3306) is ok for the new master..
Tue Aug 7 09:34:05 2018 - [info] ok.
Tue Aug 7 09:34:05 2018 - [info] 192.168.56.102(192.168.56.102:3306): SHOW SLAVE STATUS returned empty result. To check replication filtering rules, temporarily executing CHANGE MASTER to a dummy host.
Tue Aug 7 09:34:05 2018 - [info] 192.168.56.102(192.168.56.102:3306): Resetting slave pointing to the dummy host.
Tue Aug 7 09:34:05 2018 - [info] ** Phase 1: Configuration Check Phase completed.
Tue Aug 7 09:34:05 2018 - [info]
Tue Aug 7 09:34:05 2018 - [info] * Phase 2: Rejecting updates Phase..
Tue Aug 7 09:34:05 2018 - [info]
Tue Aug 7 09:34:05 2018 - [info] Executing master ip online change script to disable write on the current master:
Tue Aug 7 09:34:05 2018 - [info] /usr/local/bin/master_ip_online_change --command=stop --orig_master_host=192.168.56.102 --orig_master_ip=192.168.56.102 --orig_master_port=3306 --orig_master_user='mha_mon' --new_master_host=192.168.56.103 --new_master_ip=192.168.56.103 --new_master_port=3306 --new_master_user='mha_mon' --orig_master_ssh_user=root --new_master_ssh_user=root --orig_master_is_new_slave --orig_master_password=xxx --new_master_password=xxx
Tue Aug 7 09:34:05 2018 375945 Set read_only on the new master.. ok.
Tue Aug 7 09:34:05 2018 378356 Set read_only=1 on the orig master.. ok.
Disabling the VIP on old master: 192.168.56.102
Tue Aug 7 09:34:05 2018 688030 Killing all application threads..
Tue Aug 7 09:34:05 2018 688091 done.
Tue Aug 7 09:34:05 2018 - [info] ok.
Tue Aug 7 09:34:05 2018 - [info] Locking all tables on the orig master to reject updates from everybody (including root):
Tue Aug 7 09:34:05 2018 - [info] Executing FLUSH TABLES WITH READ LOCK..
Tue Aug 7 09:34:05 2018 - [info] ok.
Tue Aug 7 09:34:05 2018 - [info] Orig master binlog:pos is mysql-bin.000007:154.
Tue Aug 7 09:34:05 2018 - [info] Waiting to execute all relay logs on 192.168.56.103(192.168.56.103:3306)..
Tue Aug 7 09:34:05 2018 - [info] master_pos_wait(mysql-bin.000007:154) completed on 192.168.56.103(192.168.56.103:3306). Executed 0 events.
Tue Aug 7 09:34:05 2018 - [info] done.
Tue Aug 7 09:34:05 2018 - [info] Getting new master's binlog name and position..
Tue Aug 7 09:34:05 2018 - [info] mysql-bin.000008:154
Tue Aug 7 09:34:05 2018 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.56.103', MASTER_PORT=3306, MASTER_LOG_FILE='mysql-bin.000008', MASTER_LOG_POS=154, MASTER_USER='replicator', MASTER_PASSWORD='xxx';
Tue Aug 7 09:34:05 2018 - [info] Executing master ip online change script to allow write on the new master:
Tue Aug 7 09:34:05 2018 - [info] /usr/local/bin/master_ip_online_change --command=start --orig_master_host=192.168.56.102 --orig_master_ip=192.168.56.102 --orig_master_port=3306 --orig_master_user='mha_mon' --new_master_host=192.168.56.103 --new_master_ip=192.168.56.103 --new_master_port=3306 --new_master_user='mha_mon' --orig_master_ssh_user=root --new_master_ssh_user=root --orig_master_is_new_slave --orig_master_password=xxx --new_master_password=xxx
Tue Aug 7 09:34:05 2018 773788 Set read_only=0 on the new master.
Enabling the VIP - 192.168.56.100 on the new master - 192.168.56.103
Tue Aug 7 09:34:05 2018 - [info] ok.
Tue Aug 7 09:34:05 2018 - [info]
Tue Aug 7 09:34:05 2018 - [info] * Switching slaves in parallel..
Tue Aug 7 09:34:05 2018 - [info]
Tue Aug 7 09:34:05 2018 - [info] -- Slave switch on host 192.168.56.104(192.168.56.104:3306) started, pid: 32206
Tue Aug 7 09:34:05 2018 - [info]
Tue Aug 7 09:34:06 2018 - [info] Log messages from 192.168.56.104 ...
Tue Aug 7 09:34:06 2018 - [info]
Tue Aug 7 09:34:05 2018 - [info] Waiting to execute all relay logs on 192.168.56.104(192.168.56.104:3306)..
Tue Aug 7 09:34:06 2018 - [info] master_pos_wait(mysql-bin.000007:154) completed on 192.168.56.104(192.168.56.104:3306). Executed 0 events.
Tue Aug 7 09:34:06 2018 - [info] done.
Tue Aug 7 09:34:06 2018 - [info] Resetting slave 192.168.56.104(192.168.56.104:3306) and starting replication from the new master 192.168.56.103(192.168.56.103:3306)..
Tue Aug 7 09:34:06 2018 - [info] Executed CHANGE MASTER.
Tue Aug 7 09:34:06 2018 - [info] Slave started.
Tue Aug 7 09:34:06 2018 - [info] End of log messages from 192.168.56.104 ...
Tue Aug 7 09:34:06 2018 - [info]
Tue Aug 7 09:34:06 2018 - [info] -- Slave switch on host 192.168.56.104(192.168.56.104:3306) succeeded.
Tue Aug 7 09:34:06 2018 - [info] Unlocking all tables on the orig master:
Tue Aug 7 09:34:06 2018 - [info] Executing UNLOCK TABLES..
Tue Aug 7 09:34:06 2018 - [info] ok.
Tue Aug 7 09:34:06 2018 - [info] Starting orig master as a new slave..
Tue Aug 7 09:34:06 2018 - [info] Resetting slave 192.168.56.102(192.168.56.102:3306) and starting replication from the new master 192.168.56.103(192.168.56.103:3306)..
Tue Aug 7 09:34:07 2018 - [info] Executed CHANGE MASTER.
Tue Aug 7 09:34:07 2018 - [info] Slave started.
Tue Aug 7 09:34:07 2018 - [info] All new slave servers switched successfully.
Tue Aug 7 09:34:07 2018 - [info]
Tue Aug 7 09:34:07 2018 - [info] * Phase 5: New master cleanup phase..
Tue Aug 7 09:34:07 2018 - [info]
Tue Aug 7 09:34:07 2018 - [info] 192.168.56.103: Resetting slave info succeeded.
Tue Aug 7 09:34:07 2018 - [info] Switching master to 192.168.56.103(192.168.56.103:3306) completed successfully.
原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/3884.html