MySQL高可用群集MHA部署及故障測試分析
一、案例前置知識
1.1、MHA概述
1.1.1、一套優秀的MySQL高可用環境下故障切換和主從複製的軟體
1.1.2、MySQL故障過程中，MHA能做到0-30秒內自動完成故障切換
1.2、MHA的組成
1.2.1、MHA Manager（管理節點）
Manager可以單獨部署在一臺獨立的機器上管理多個master-slave叢集，也可以部署在一臺slave節點上。
1.2.2、MHA Node（資料節點）
Node執行在每臺MySQL伺服器上，MHA Manager會定時探測叢集中的master節點，當master出現故障時，它可以自動將最新資料的slave提升為新的master，然後將所有其他的slave重新指向新的master。
1.3、MHA特點
1.3.1、自動故障切換過程中，MHA試圖從當機的主伺服器上儲存二進位制日誌，最大程度的保證資料不丟失
1.3.2、使用半同步複製，可以大大降低資料丟失的風險
1.3.3、目前MHA支援一主多從架構，最少三臺服務，即一主兩從
1.4、MHA缺點
1.4.1、需要編寫指令碼或利用第三方工具來實現vip的配置
1.4.2、MHA啟動後只會對資料庫進行監控，需要基於ssh免認證配置，存在一定的安全隱患
1.4.3、沒有提供從伺服器的讀負載均很的功能。
二、案例拓撲圖
三、案例部署
3.1、部署思路
3.1.1、MHA架構
①資料庫安裝
②一主兩從
③MHA搭建
3.1.2、故障模擬
①主庫失效
②備選主庫成為主庫
③從庫2將備選主庫指向為主庫
3.1.3、故障修復
①壞庫修復，啟動
②在修復好的庫上建立新主從關係
③修改manager配置檔案，新增修好的庫的記錄
④重啟mha
主伺服器：mysql-server 20.0.0.10，從1伺服器：mysql-slave1 20.0.0.20，從2伺服器：mysql-slave2 20.0.0.30，mha:20.0.0.40
3.2、在三臺 MySQL 節點上分別安裝資料庫
MySQL 版本請使用 5.6.36，cmake 版本請使用 2.8.6。安裝過程如下。
3.2.1、在主伺服器上
主伺服器
yum -y install ncurses-devel gcc-c++ perl-Module-Install
tar zxvf cmake-2.8.6.tar.gz
cd cmake-2.8.6
./configure
gmake && gmake install
cd
tar zxvf mysql-5.6.36.tar.gz
cd mysql-5.6.36
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_EXTRA_CHARSETS=all -DSYSCONFDIR=/etc
make && make install
cp support-files/my-default.cnf /etc/my.cnf
cp support-files/mysql.server /etc/rc.d/init.d/mysqld
chmod +x /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
echo "PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile
source /etc/profile
groupadd mysql
useradd -M -s /sbin/nologin mysql -g mysql
chown -R mysql.mysql /usr/local/mysql
mkdir -p /data/mysql
/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql
echo '
[client]
port = 3306
socket = /usr/local/mysql/mysql.sock
[mysql]
port = 3306
socket = /usr/local/mysql/mysql.sock
[mysqld]
user = mysql
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
port = 3306
pid-file = /usr/local/mysql/mysqld.pid
socket = /usr/local/mysql/mysql.sock
server-id = 1
log_bin = master-bin
log-slave-updates = true
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,PIPES_AS_CONCAT,ANSI_QUOTES' > /etc/my.cnf
ln -s /usr/local/mysql/bin/mysql /usr/sbin/
ln -s /usr/local/mysql/bin/mysqlbinlog /usr/sbin/
systemctl start mysqld
netstat -anpt | grep 3306
3.2.2、在伺服器1上
從1伺服器
yum -y install ncurses-devel gcc-c++ perl-Module-Install
tar zxvf cmake-2.8.6.tar.gz
cd cmake-2.8.6
./configure
gmake && gmake install
cd
tar zxvf mysql-5.6.36.tar.gz
cd mysql-5.6.36
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_EXTRA_CHARSETS=all -DSYSCONFDIR=/etc
make && make install
cp support-files/my-default.cnf /etc/my.cnf
cp support-files/mysql.server /etc/rc.d/init.d/mysqld
chmod +x /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
echo "PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile
source /etc/profile
groupadd mysql
useradd -M -s /sbin/nologin mysql -g mysql
chown -R mysql.mysql /usr/local/mysql
mkdir -p /data/mysql
/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql
echo '
[client]
port = 3306
socket = /usr/local/mysql/mysql.sock
[mysql]
port = 3306
socket = /usr/local/mysql/mysql.sock
[mysqld]
user = mysql
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
port = 3306
pid-file = /usr/local/mysql/mysqld.pid
socket = /usr/local/mysql/mysql.sock
server-id = 2
log_bin = master-bin
relay-log = relay-log-bin
relay-log-index = slave-relay-bin.index
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,PIPES_AS_CONCAT,ANSI_QUOTES' > /etc/my.cnf
ln -s /usr/local/mysql/bin/mysql /usr/sbin/
ln -s /usr/local/mysql/bin/mysqlbinlog /usr/sbin/
systemctl start mysqld
netstat -anpt | grep 3306
3.2.3、在伺服器2上
從2伺服器
yum -y install ncurses-devel gcc-c++ perl-Module-Install
tar zxvf cmake-2.8.6.tar.gz
cd cmake-2.8.6
./configure
gmake && gmake install
cd
tar zxvf mysql-5.6.36.tar.gz
cd mysql-5.6.36
cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_EXTRA_CHARSETS=all -DSYSCONFDIR=/etc
make && make install
cp support-files/my-default.cnf /etc/my.cnf
cp support-files/mysql.server /etc/rc.d/init.d/mysqld
chmod +x /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
echo "PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile
source /etc/profile
groupadd mysql
useradd -M -s /sbin/nologin mysql -g mysql
chown -R mysql.mysql /usr/local/mysql
mkdir -p /data/mysql
/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql
echo '
[client]
port = 3306
socket = /usr/local/mysql/mysql.sock
[mysql]
port = 3306
socket = /usr/local/mysql/mysql.sock
[mysqld]
user = mysql
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
port = 3306
pid-file = /usr/local/mysql/mysqld.pid
socket = /usr/local/mysql/mysql.sock
server-id = 3
relay-log = relay-log-bin
relay-log-index = slave-relay-bin.index
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,PIPES_AS_CONCAT,ANSI_QUOTES' > /etc/my.cnf
ln -s /usr/local/mysql/bin/mysql /usr/sbin/
ln -s /usr/local/mysql/bin/mysqlbinlog /usr/sbin/
systemctl start mysqld
netstat -anpt | grep 3306
3.3、配置 MySQL一主兩從
3.3.1、MySQL 主從配置相對比較簡單，需要注意的是授權。步驟如下：在所有資料庫節點上授權兩個使用者，一個是從庫同步使用，另外一個是 manager 使用。
mysql> grant replication slave on *.* to 'myslave'@'20.0.0.%' identified by '123';
mysql> grant all privileges on *.* to 'mha'@'20.0.0.%' identified by 'manager';
mysql> flush privileges;
3.3.2、在主伺服器上檢視二進位制檔案和同步點
mysql> show master status;
+-------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
| master-bin.000001 | 608 | | | |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
3.3.3、接下來在從1 和 從2 分別執行同步,檢視 IO 和 SQL 執行緒都是 yes 代表同步是否正常
mysql> change master to master_host='20.0.0.10',master_user='myslave',master_password='123',master_log_file='master-bin.000001',master_log_pos=608;
mysql> start slave;
mysql> show slave status\G;
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
1 I/O執行緒顯示為NO: 主庫與從庫網路不通、主庫未授權給從庫
2 SQL執行緒顯示為NO：從庫日誌和位置點與主不同步
3 若從庫檢視連線主庫I/0執行緒狀態為conneting，一直是這個狀態，考慮雙方的防火牆是否開啟。
3.3.4、必須設定兩個從庫為只讀模式
mysql> set global read_only=1;
3.3.5、在主庫插入兩條資料，測試是否同步
mysql> create database test_xuhao;
mysql> use test_xuhao;
mysql> create table test(id int);
mysql> insert into test(id) values (1);
mysql> select * from test;
3.3.6、在兩個從庫分別查詢如下所示說明主從同步正常
從1
mysql> select * from test_xuhao.test;
+------+
| id |
+------+
| 1 |
+------+
1 row in set (0.00 sec)
從2
mysql> select * from test_xuhao.test;
+------+
| id |
+------+
| 1 |
+------+
1 row in set (0.00 sec)
3.4、安裝MHA軟體
3.4.1、在所有伺服器上都安裝 MHA 依賴的環境，每個伺服器上都需要兩個源（epel.repo和CentOS7-Base-163.repo）,將這兩個源放入/etc/yum.repos.d的目錄下，在主伺服器上操作演示安裝
yum install epel-release --nogpgcheck
2 yum install -y perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker perl-CPAN
3.4.2、在所有伺服器上必須先安裝 node 元件，最後在 MHA-manager 節點上安裝 manager 元件，因為 manager 依賴 node 元件
tar zxvf mha4mysql-node-0.57.tar.gz
cd mha4mysql-node-0.57
perl Makefile.PL
make && make install
3.4.3、在mha-manager 伺服器上安裝 manager 元件
tar zxvf mha4mysql-manager-0.57.tar.gz
cd mha4mysql-manager-0.57
perl Makefile.PL
*** Module::AutoInstall version 1.06
*** Checking for Perl dependencies...
[Core Features]
- DBI ...loaded. (1.627)
- DBD::mysql ...loaded. (4.023)
- Time::HiRes ...loaded. (1.9725)
- Config::Tiny ...loaded. (2.14)
- Log::Dispatch ...loaded. (2.41)
- Parallel::ForkManager ...loaded. (1.18)
- MHA::NodeConst ...loaded. (0.57)
*** Module::AutoInstall configuration finished.
Checking if your kit is complete...
Looks good
Writing Makefile for mha4mysql::manager
make && make install
manager 安裝後在/usr/local/bin 下面會生成幾個工具，主要包括以下幾個：
masterha_check_ssh 檢查 MHA 的 SSH 配置狀況
masterha_check_repl 檢查 MySQL 複製狀況
masterha_manger 啟動 manager的指令碼
masterha_check_status 檢測當前 MHA 執行狀態
masterha_master_monitor 檢測 master 是否當機
masterha_master_switch 控制故障轉移（自動或者手動）
masterha_conf_host 新增或刪除配置的 server 資訊
masterha_stop 關閉manager
node 安裝後也會在/usr/local/bin 下面會生成幾個指令碼（這些工具通常由 MHA-Manager 的指令碼觸發，無需人為操作）主要如下：
save_binary_logs 儲存和複製 master 的二進位制日誌
apply_diff_relay_logs 識別差異的中繼日誌事件並將其差異的事件應用於其他的 slave
filter_mysqlbinlog 去除不必要的 ROLLBACK 事件（MHA 已不再使用這個工具）
purge_relay_logs 清除中繼日誌（不會阻塞 SQL 執行緒）
3.5、配置無密碼認證
3.5.1、 在 manager伺服器 上配置到所有節點的無密碼認證
ssh-keygen -t rsa #一路按Enter鍵
ssh-copy-id 20.0.0.10 #先輸入yes，再輸入20.0.0.10伺服器的密碼
ssh-copy-id 20.0.0.20
ssh-copy-id 20.0.0.30
驗證
ssh root@20.0.0.10
ssh root@20.0.0.20
ssh root@20.0.0.30
3.5.2、在主伺服器上配置到資料庫節點的無密碼認證
ssh-keygen -t rsa
ssh-copy-id 20.0.0.20
ssh-copy-id 20.0.0.30
驗證
ssh root@20.0.0.20
ssh root@20.0.0.30
3.5.3、在從1伺服器上配置到資料庫節點的無密碼認證
ssh-keygen -t rsa
ssh-copy-id 20.0.0.10
ssh-copy-id 20.0.0.30
驗證
ssh root@20.0.0.10
ssh root@20.0.0.30
3.5.4、在從2伺服器上配置到資料庫節點的無密碼認證
ssh-keygen -t rsa
ssh-copy-id 20.0.0.10
ssh-copy-id 20.0.0.20
驗證
ssh root@20.0.0.10
ssh root@20.0.0.20
3.6、 配置 MHA
3.6.1、在 manager 節點上覆制相關指令碼到/usr/local/bin 目錄,複製上述的自動切換時 VIP 管理的指令碼到/usr/local/bin 目錄，這裡使用指令碼管理 VIP
cp -ra mha4mysql-manager-0.57/samples/scripts /usr/local/bin
ll /usr/local/bin/scripts/
cp /usr/local/bin/scripts/master_ip_failover /usr/local/bin
vi /usr/local/bin/master_ip_failover
刪除檔案裡的所有內容，複製下面的內容
#!/usr/bin/env perl
use strict;
use warnings FATAL => 'all';
use Getopt::Long;
my (
$command, $ssh_user, $orig_master_host, $orig_master_ip,
$orig_master_port, $new_master_host, $new_master_ip, $new_master_port
);
#############################新增內容部分#########################################
my $vip = '20.0.0.200';
my $brdc = '20.0.0.255';
my $ifdev = 'ens33';
my $key = '1';
my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig ens33:$key down";
my $exit_code = 0;
#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,
'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,
);
exit &main();
sub main {
print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";
if ( $command eq "stop" || $command eq "stopssh" ) {
my $exit_code = 1;
eval {
print "Disabling the VIP on old master: $orig_master_host \n";
&stop_vip();
$exit_code = 0;
};
if ($@) {
warn "Got Error: $@\n";
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "start" ) {
my $exit_code = 10;
eval {
print "Enabling the VIP - $vip on the new master - $new_master_host \n";
&start_vip();
$exit_code = 0;
};
if ($@) {
warn $@;
exit $exit_code;
}
exit $exit_code;
}
elsif ( $command eq "status" ) {
print "Checking the Status of the script.. OK \n";
exit 0;
}
else {
&usage();
exit 1;
}
}
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 \"`;
}
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";
}
拷貝後會有四個執行檔案，檔案的含義如下：
1 master_ip_failover #自動切換時 VIP 管理的指令碼
2 master_ip_online_change #線上切換時 vip 的管理
3 power_manager #故障發生後關閉主機的指令碼
4 send_report #因故障切換後傳送報警的指令碼
3.6.2、建立 MHA 軟體目錄並拷貝配置檔案
1 mkdir /etc/masterha
2 cp mha4mysql-manager-0.57/samples/conf/app1.cnf /etc/masterha/
3 vim /etc/masterha/app1.cnf
4 [server default]
5 manager_workdir=/var/log/masterha/app1
6 manager_log=/var/log/masterha/app1/manager.log
7 master_binlog_dir=/usr/local/mysql/data
8 master_ip_failover_script= /usr/local/bin/master_ip_failover
9 master_ip_online_change_script= /usr/local/bin/master_ip_online_change10 password=manager
11 user=mha
12 ping_interval=1
13 remote_workdir=/tmp
14 repl_password=123
15 repl_user=myslave
16 secondary_check_script= /usr/local/bin/masterha_secondary_check -s 20.0.0.20 -s 20.0.0.30
17 shutdown_script=""
18 ssh_user=root
19 [server1]
20 hostname=20.0.0.10
21 port=3306
22 [server2]
23 hostname=20.0.0.20
24 port=3306
25 candidate_master=1
26 check_repl_delay=0
27 [server3]
28 hostname=20.0.0.30
29 port=3306
3.6.3、測試 ssh 無密碼認證，如果正常最後會輸出 successfully，如下所示
masterha_check_ssh -conf=/etc/masterha/app1.cnf
......
Wed Oct 28 00:07:09 2020 - [debug] Connecting via SSH from root@20.0.0.30(20.0.0.30:22) to root@20.0.0.20(20.0.0.20:22)..
Wed Oct 28 00:07:10 2020 - [debug] ok.
Wed Oct 28 00:07:10 2020 - [debug]
Wed Oct 28 00:07:08 2020 - [debug] Connecting via SSH from root@20.0.0.20(20.0.0.20:22) to root@20.0.0.10(20.0.0.10:22)..
Wed Oct 28 00:07:09 2020 - [debug] ok.
Wed Oct 28 00:07:09 2020 - [debug] Connecting via SSH from root@20.0.0.20(20.0.0.20:22) to root@20.0.0.30(20.0.0.30:22)..
Wed Oct 28 00:07:09 2020 - [debug] ok.
Wed Oct 28 00:07:10 2020 - [info] All SSH connection tests passed successfully.
3.6.4、測試 MySQL 主從連線情況，最後出現 MySQL Replication Health is OK 字樣說明正常
masterha_check_repl -conf=/etc/masterha/app1.cnf
......
IN SCRIPT TEST====/sbin/ifconfig ens33:1 down==/sbin/ifconfig ens33:1 20.0.0.200===
Checking the Status of the script.. OK
Wed Oct 28 09:25:28 2020 - [info] OK.
Wed Oct 28 09:25:28 2020 - [warning] shutdown_script is not defined.
Wed Oct 28 09:25:28 2020 - [info] Got exit code 0 (Not master dead).
MySQL Replication Health is OK.
3.6.5、啟動 MHA
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 &
3.6.6、檢視 MHA 狀態，可以看到當前的 master 是主伺服器節點
masterha_check_status --conf=/etc/masterha/app1.cnf
app1 (pid:24405) is running(0:PING_OK), master:20.0.0.10
3.6.7、檢視 MHA 日誌，也以看到當前的 master 是 20.0.0.10
cat /var/log/masterha/app1/manager.log
......
Wed Oct 28 09:27:04 2020 - [info] Replicating from 20.0.0.10(20.0.0.10:3306)
Wed Oct 28 09:27:04 2020 - [info] Current Alive Master: 20.0.0.10(20.0.0.10:3306)
Wed Oct 28 09:27:04 2020 - [info] Checking slave configurations..
Wed Oct 28 09:27:04 2020 - [warning] relay_log_purge=0 is not set on slave 20.0.0.20(20.0.0.20:3306).
Wed Oct 28 09:27:04 2020 - [warning] relay_log_purge=0 is not set on slave 20.0.0.30(20.0.0.30:3306).
Wed Oct 28 09:27:04 2020 - [warning] log-bin is not set on slave 20.0.0.30(20.0.0.30:3306). This host cannot be a master.
......
3.6.8、第一次配置vip的時候，需要在主伺服器上建立虛擬IP地址
ifconfig ens33:1 20.0.0.200/24
ifconfig
四、故障測試
4.1、關閉主伺服器的mysql服務
pkill mysqld
4.2、檢視從1伺服器的虛擬IP地址有沒有轉移過來，從2上檢視主伺服器是不是從1
從1伺服器
ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 20.0.0.20 netmask 255.255.255.0 broadcast 20.0.0.255
inet6 fe80::a140:18a2:d866:8f33 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:42:10:0a txqueuelen 1000 (Ethernet)
RX packets 1315993 bytes 1324408060 (1.2 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 795190 bytes 69519345 (66.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens33:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 20.0.0.200 netmask 255.0.0.0 broadcast 20.255.255.255
ether 00:0c:29:42:10:0a txqueuelen 1000 (Ethernet)
從2伺服器
mysql
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 20.0.0.20
Master_User: myslave
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-bin.000003
Read_Master_Log_Pos: 120
Relay_Log_File: relay-log-bin.000002
Relay_Log_Pos: 284
Relay_Master_Log_File: master-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
......
4.3、重新開啟manager伺服器
4.3.1、主伺服器開啟mysql服務
systemctl restart mysqld
4.3.2、檢視從1伺服器檢視二進位制檔案和同步點
mysql> show master status;
+-------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
| master-bin.000003 | 120 | | | |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
4.3.3、在主伺服器上執行同步,檢視 IO 和 SQL 執行緒都是 yes 代表同步是否正常
mysql> change master to
master_host='20.0.0.20',master_user='myslave',master_password='123',master_log_file='master-bin.000003',master_log_pos=120;
mysql> start slave;
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 20.0.0.20
Master_User: myslave
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-bin.000003
Read_Master_Log_Pos: 120
Relay_Log_File: mysqld-relay-bin.000002
Relay_Log_Pos: 284
Relay_Master_Log_File: master-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes18 ......
4.3.4、在從1上建立，主伺服器和從2上檢視
從1伺服器
mysql> create database aa;
mysql> use aa;
mysql> create table test(id int(3));
mysql> insert into test values(1);
mysql> select * from test;
+------+
| id |
+------+
| 1 |
+------+
主伺服器
mysql> use aa;
mysql> select * from test;
+------+
| id |
+------+
| 1 |
+------+
從2伺服器
mysql> use aa;
mysql> select * from test;
+------+
| id |
+------+
| 1 |
+------+
4.3.5、在manager伺服器上修改配置檔案(再把這個記錄新增進去，因為它檢測掉失效時候會自動消失)
vi /etc/masterha/app1.cnf
......
[server1]
hostname=192.168.8.134
port=3306
......
4.3.6、在manager伺服器上啟動manager
masterha_check_ssh -conf=/etc/masterha/app1.cnf
masterha_check_repl -conf=/etc/masterha/app1.cnf
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 &
masterha_check_status --conf=/etc/masterha/app1.cnf
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