因為測試使用，所以只搞兩台測試機來測試，
實際正式環境是使用三台，master / slave / manager (MHA)
以下為本次測試環境
| Hostname | IPAddress | Linux |
| Master | 10.211.55.6 / 10.211.55.10 (VIP) | CentOS 7.8 |
| Slave / Manager | 10.211.55.7 | CentOS 7.8 |
環境安裝:
yum install net-tools
yum install perl-Parallel-ForkManager
yum install perl-Log-Dispatch
yum install perl-Config-Tiny
yum install perl-DBD-MySQL
# 以下是測試過程中，還有另外安裝的項目
yum install perl-Module-Install
yum install perl-IPC-Run3
yum install *YAML*
yum install gcc
yum install centos-release-scl-rh
yum install rh-perl526-perl-Specio
rpm -ivy http://repo.openfusion.net/centos7-x86_64/perl-Test-Needs-0.002005-1.of.el7.noarch.rpmSSH Keyless (每台互連均要設定)
ssh-keygen
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.211.55.6
ssh-keygen
ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.211.55.7MySQL 加入 MHA 監控帳號 ( 從Master設定，再同步至Slave端 )
create user 'mha_manager'@'10.211.55.%' identified by 'mhapass';
grant reload, super on *.* to 'mha_manager'@'10.211.55.%';
grant select on mysql.* to 'mha_manager'@'10.211.55.%';
grant all on mysql.apply_diff_relay_logs to 'mha_manager'@'10.211.55.%';
grant all on mysql.apply_diff_relay_logs_test to 'mha_manager'@'10.211.55.%';
採用 Master High Active (MHA) 0.58 版本，從官網下載 source code 來安裝，安裝過程使用 root 身份進行安裝
Node 節點:
git clone https://github.com/yoshinorim/mha4mysql-node.git
cd mha4mysql-node/
perl Makefile.PL
make
mkae installManager 節點:
git clone https://github.com/yoshinorim/mha4mysql-manager.git
cd mha4mysql-manager
perl -MCPAN -e "install Config::Tiny"
perl -MCPAN -e "install Log::Dispatch"
perl -MCPAN -e "install Parallel::ForkManager"
perl Makefile.PL
make
make installManager Conf 設定 ( 可參考 mha4mysql-manager/samples/conf/masterha_default.cnf )
[server default]
user=mha_manager
password=mhapass
ssh_user=root
master_binlog_dir=/var/lib/mysql/,/binlog/3306/
remote_workdir=/data/manager
#secondary_check_script= masterha_secondary_check -s remote_host1 -s remote_host2
ping_interval=3
repl_user=repl
repl_password=repl
master_ip_failover_script="/opt/mha4mysql-manager-0.56/samples/scripts/master_ip_failover"
master_ip_online_change_script="/opt/mha4mysql-manager-0.56/samples/scripts/master_ip_online_change"
# shutdown_script= /script/masterha/power_manager
# report_script= /script/masterha/send_report
[server1]
hostname=10.211.55.7
candidate_master=1
[server2]
hostname=10.211.55.6
candidate_master=1SSH 測試
masterha_check_ssh --conf=/opt/mhamanager/masterha_default.cnf
Thu May 28 15:54:56 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Thu May 28 15:54:56 2020 - [info] Reading application default configuration from /opt/mhamanager/masterha_default.cnf..
Thu May 28 15:54:56 2020 - [info] Reading server configuration from /opt/mhamanager/masterha_default.cnf..
Thu May 28 15:54:56 2020 - [info] Starting SSH connection tests..
Thu May 28 15:54:57 2020 - [debug]
Thu May 28 15:54:56 2020 - [debug] Connecting via SSH from root@10.211.55.6(10.211.55.6:22) to root@10.211.55.7(10.211.55.7:22)..
Thu May 28 15:54:57 2020 - [debug] ok.
Thu May 28 15:54:58 2020 - [debug]
Thu May 28 15:54:56 2020 - [debug] Connecting via SSH from root@10.211.55.7(10.211.55.7:22) to root@10.211.55.6(10.211.55.6:22)..
Thu May 28 15:54:57 2020 - [debug] ok.
Thu May 28 15:54:58 2020 - [info] All SSH connection tests passed successfully.
測試 Repl 功能是否正常
masterha_check_repl --conf=/opt/mhamanager/masterha_default.cnf Thu May 28 16:10:59 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Thu May 28 16:10:59 2020 - [info] Reading application default configuration from /opt/mhamanager/masterha_default.cnf..
Thu May 28 16:10:59 2020 - [info] Reading server configuration from /opt/mhamanager/masterha_default.cnf..
Thu May 28 16:10:59 2020 - [info] MHA::MasterMonitor version 0.58.
Thu May 28 16:11:00 2020 - [error][/usr/local/share/perl5/MHA/ServerManager.pm, ln193] There is no alive slave. We can't do failover
Thu May 28 16:11:00 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln427] Error happened on checking configurations. at /usr/local/share/perl5/MHA/MasterMonitor.pm line 329.
Thu May 28 16:11:00 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln525] Error happened on monitoring servers.
Thu May 28 16:11:00 2020 - [info] Got exit code 1 (Not master dead).MySQL Replication Health is NOT OK!
Repl 測試有錯誤，因為Slave防火牆沒關…
關掉後重試，會發生不認得 super_read_only 這個參數，google 發現問題所在，這是 Mariadb 10.1以後才有的參數，只能降 MHA 的版本！
Thu May 28 16:52:52 2020 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='mha_manager' --slave_host=10.211.55.6 --slave_ip=10.211.55.6 --slave_port=3306 --workdir=/data/manager --target_version=10.5.3-MariaDB-log --manager_version=0.56 --relay_log_info=/binlog/3306/relay-log.info --relay_dir=/data/3306/ --slave_pass=xxx
Thu May 28 16:52:52 2020 - [info] Connecting to root@10.211.55.6(10.211.55.6:22)..
Checking slave recovery environment settings..
Opening /binlog/3306/relay-log.info ... ok.
Relay log found at /binlog/3306, up to relay-bin.000014
Temporary relay log file is /binlog/3306/relay-bin.000014
Checking if super_read_only is defined and turned on..DBD::mysql::st execute failed: Unknown system variable 'super_read_only' at /usr/local/share/perl5/MHA/SlaveUtil.pm line 245.
改裝 0.56 版本 ( manager、node ) 重新測試 ( 下載頁面 )
Thu May 28 17:12:14 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Thu May 28 17:12:14 2020 - [info] Reading application default configuration from /root/masterha_default.cnf..
Thu May 28 17:12:14 2020 - [info] Reading server configuration from /root/masterha_default.cnf..
Thu May 28 17:12:14 2020 - [info] MHA::MasterMonitor version 0.56.
Thu May 28 17:12:15 2020 - [info] GTID failover mode = 0
Thu May 28 17:12:15 2020 - [info] Dead Servers:
Thu May 28 17:12:15 2020 - [info] Alive Servers:
Thu May 28 17:12:15 2020 - [info] 10.211.55.7(10.211.55.7:3306)
Thu May 28 17:12:15 2020 - [info] 10.211.55.6(10.211.55.6:3306)
Thu May 28 17:12:15 2020 - [info] Alive Slaves:
Thu May 28 17:12:15 2020 - [info] 10.211.55.6(10.211.55.6:3306) Version=10.5.3-MariaDB-log (oldest major version between slaves) log-bin:enabled
Thu May 28 17:12:15 2020 - [info] Replicating from 10.211.55.7(10.211.55.7:3306)
Thu May 28 17:12:15 2020 - [info] Primary candidate for the new Master (candidate_master is set)
Thu May 28 17:12:15 2020 - [info] Current Alive Master: 10.211.55.7(10.211.55.7:3306)
Thu May 28 17:12:15 2020 - [info] Checking slave configurations..
Thu May 28 17:12:15 2020 - [info] read_only=1 is not set on slave 10.211.55.6(10.211.55.6:3306).
Thu May 28 17:12:15 2020 - [warning] relay_log_purge=0 is not set on slave 10.211.55.6(10.211.55.6:3306).
Thu May 28 17:12:15 2020 - [info] Checking replication filtering settings..
Thu May 28 17:12:15 2020 - [info] binlog_do_db= , binlog_ignore_db=
Thu May 28 17:12:15 2020 - [info] Replication filtering check ok.
Thu May 28 17:12:15 2020 - [info] GTID (with auto-pos) is not supported
Thu May 28 17:12:15 2020 - [info] Starting SSH connection tests..
Thu May 28 17:12:17 2020 - [info] All SSH connection tests passed successfully.
Thu May 28 17:12:17 2020 - [info] Checking MHA Node version..
Thu May 28 17:12:17 2020 - [info] Version check ok.
Thu May 28 17:12:17 2020 - [info] Checking SSH publickey authentication settings on the current master..
Thu May 28 17:12:18 2020 - [info] HealthCheck: SSH to 10.211.55.7 is reachable.
Thu May 28 17:12:18 2020 - [info] Master MHA Node version is 0.58.
Thu May 28 17:12:18 2020 - [info] Checking recovery script configurations on 10.211.55.7(10.211.55.7:3306)..
Thu May 28 17:12:18 2020 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/var/lib/mysql/,/var/log/mysql --output_file=/data/manager/save_binary_logs_test --manager_version=0.56 --start_file=mysql-bin.000007
Thu May 28 17:12:18 2020 - [info] Connecting to root@10.211.55.7(10.211.55.7:22)..
Creating /data/manager if not exists.. ok.
Checking output directory is accessible or not..
ok.
Binlog found at /var/lib/mysql/, up to mysql-bin.000007
Thu May 28 17:12:19 2020 - [info] Binlog setting check done.
Thu May 28 17:12:19 2020 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Thu May 28 17:12:19 2020 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='mha_manager' --slave_host=10.211.55.6 --slave_ip=10.211.55.6 --slave_port=3306 --workdir=/data/manager --target_version=10.5.3-MariaDB-log --manager_version=0.56 --relay_log_info=/binlog/3306/relay-log.info --relay_dir=/data/3306/ --slave_pass=xxx
Thu May 28 17:12:19 2020 - [info] Connecting to root@10.211.55.6(10.211.55.6:22)..
Checking slave recovery environment settings..
Opening /binlog/3306/relay-log.info ... ok.
Relay log found at /binlog/3306, up to relay-bin.000016
Temporary relay log file is /binlog/3306/relay-bin.000016
Testing mysql connection and privileges.. done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Thu May 28 17:12:19 2020 - [info] Slaves settings check done.
Thu May 28 17:12:19 2020 - [info]
10.211.55.7(10.211.55.7:3306) (current master)
+--10.211.55.6(10.211.55.6:3306)
Thu May 28 17:12:19 2020 - [info] Checking replication health on 10.211.55.6..
Thu May 28 17:12:19 2020 - [info] ok.
Thu May 28 17:12:19 2020 - [warning] master_ip_failover_script is not defined.
Thu May 28 17:12:19 2020 - [warning] shutdown_script is not defined.
Thu May 28 17:12:19 2020 - [info] Got exit code 0 (Not master dead).
MySQL Replication Health is OK.
確認沒問題，啟動 MHA 的服務吧！
nohup masterha_manager --conf=/root/masterha_default.cnf > /tmp/mha.log 2>&1 &
測試：Online switchover，要先調整 sample 提供的 master_ip_online_change 腳本
#!/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,
);
####新增區塊####
my $vip = '10.211.55.10/24';
my $key = "0";
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
my $exit_code = 0;
####新增區塊####
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
$orig_master_handler->disable_log_bin_local();
print current_time_us() . " Drpping app user on the orig master..\n";
##Mark
#FIXME_xxx_drop_app_user($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
####新增區塊####
&stop_vip();
####新增區塊####
$exit_code = 0;
};
if ($@) {
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";
$new_master_handler->disable_read_only();
## Creating an app user on the new master
print current_time_us() . " Creating app user on the new master..\n";
##Mark
#FIXME_xxx_create_app_user($new_master_handler);
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
####新增區塊####
&start_vip();
####新增區塊####
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
####新增區塊####
print "Checking the Status of the script.. OK \n";
`ssh $orig_master_ssh_user\@$orig_master_host \" $ssh_start_vip \"`;
####新增區塊####
# do nothing
exit 0;
}
else {
&usage();
exit 1;
}
}
####新增區塊####
# 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 \"`;
}
####新增區塊####
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;
}切換測試 ( masterha_manager 服務必需是停止的狀態，不然無法 online 切換 )
masterha_master_switch --master_state=alive --conf=/root/masterha_default.cnf --orig_master_is_new_slave
測試：Failover 切換
要先調整原本 sample 提供的 master_ip_failover 腳本，調整完要啟用 masterha_manager 服務，才能後續的測試
#!/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;
my (
$command, $ssh_user, $orig_master_host,
$orig_master_ip, $orig_master_port, $new_master_host,
$new_master_ip, $new_master_port, $new_master_user,
$new_master_password
);
####新增區塊 Start####
my $vip = '10.211.55.10/24';
my $key = "0";
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
####新增區塊 End####
GetOptions(
'command=s' => \$command,
'ssh_user=s' => \$ssh_user,
'orig_master_host=s' => \$orig_master_host,
'orig_master_ip=s' => \$orig_master_ip,
'orig_master_port=i' => \$orig_master_port,
'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,
);
exit &main();
sub main {
if ( $command eq "stop" || $command eq "stopssh" ) {
# $orig_master_host, $orig_master_ip, $orig_master_port are passed.
# If you manage master ip address at global catalog database,
# invalidate orig_master_ip here.
my $exit_code = 1;
eval {
####新增區塊 Start####
&stop_vip();
####新增區塊 End####
# updating global catalog, etc
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "start" ) {
# all arguments are passed.
# If you manage master ip address at global catalog database,
# activate new_master_ip here.
# You can also grant write access (create user, set read_only=0, etc) here.
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 "Set read_only=0 on the new master.\n";
$new_master_handler->disable_read_only();
## Creating an app user on the new master
print "Creating app user on the new master..\n";
FIXME_xxx_create_user( $new_master_handler->{dbh} );
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
## 這裡要Mark起來
##FIXME_xxx;
####新增區塊 Start####
&start_vip();
####新增區塊 End####
$exit_code = 0;
};
if ($@) {
warn $@;
# If you want to continue failover, exit 10.
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
####新增區塊 Start####
print "Checking the status of the script: ssh -t $ssh_user\@$orig_master_host \"$ssh_start_vip\"\n";
`ssh -t $ssh_user\@$orig_master_host \"$ssh_start_vip\"`;
####新增區塊 End####
# do nothing
exit 0;
}
else {
&usage();
exit 1;
}
}
####新增區塊 Start####
# A simple system call that enable the VIP on the new master
sub start_vip() {
`ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
}
# # A simple system call that disable the VIP on the old_master
sub stop_vip() {
`ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
}
####新增區塊 End####
sub usage {
print
"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=port\n";
}停止 Master 服務測試
# 使用 systemctl Stop Service
systemctl stop mariadb
# 或是||||||||||||||||||||||||||||
# 使用 mysqladmin 指定 Socket 停止
mysqladmin -u root -S /mysql/3306/socket/mysql.sock shutdown在 failover 後，manager 會自動關閉 ( 不知是程式 bug 還是原作者就要這樣做 )，並留下檔名 /var/tmp/masterha_default.failover.complete 的空白記錄檔，若下次要再切 failover，這個檔案要記得刪除，不然會無法切換。
附註：
問題1:
Thu May 28 22:45:12 2020 - [error][/usr/local/share/perl5/MHA/MasterFailover.pm, ln309] Last failover was done at 2020/05/28 22:04:37. Current time is too early to do failover again. If you want to do failover, manually remove /var/tmp/masterha_default.failover.complete and run this script again.
說明了已經有執行過一次 failover 處理，因為MHA每次執行過failover後，會在一個地方留下 xxxxxx.failover.complete ( xxxxxx是指您manager的設定檔名稱 )，這個檔案要刪除
問題2:
切換時，VIP沒有跟著轉過去，原因可能有幾個
1. 沒裝 net-tools，因為會使用 ifconfig 來綁定 IP
2. 沒有權限，內文是以 Linux root 帳號來執行切換，正式環境會用一般 mysql 使用者帳號，因此一般使用者帳號要有sudo權限，腳本也併加入 sudo
參考文章：
CentOS Local设置，消除告警：warning: Setting locale failed
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