一，安装MHA基本环境安装MHA节点（1）基本环境说明
角色IP地址主机名 ========================================= 主机192.168.1.121节点1 从机192.168.1.122节点2 从机192.168.1.123节点3 监视主机192.168.1.125节点5（2）在node1，node2，node3，node5中操作：＃vi / etc / hosts192.168.1.121 node1 192.168.1.122 node2 192.168.1.123 node3 192.168.1.125 node5安装MHA节点节点软件包：＃rpm -ivhhttp://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm＃yum install perl-DBD-MySQL perl-CPAN -y ＃tar xf mha4mysql -node-0.56.tar.gz ＃cd mha4mysql-node-0.56 ＃perl Makefile.PL＃make && make install 安装MHA在节点5管理节点上操作：注：MHA管理器主机也是需要安装MHA节点，MHA管理器＃yum install perl-DBD-MySQL perl-CPAN perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-time-HiRes -y ＃tar xf mha4mysql-manager-0.56.tar.gz ＃cd mha4mysql-manager -0.56 ＃perl Makefile.PL ＃make && make install＃说明：安装的脚本程序都在/ usr / local / bin /目录下。 3.节点间配置SSH登录无密码验证（MHA主机之间使用密钥登录）在node5（Monitor）中：＃ssh-keygen -t rsa ＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node1 ＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node2＃ssh- copy-id -i /root/.ssh/id_rsa.pub root @ node3在node1（Master）中：＃ssh-keygen -t rsa ＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node2 ＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node3＃ssh- copy-id -i /root/.ssh/id_rsa.pub root @ node5在node2（slave）中：＃ssh-keygen -t rsa ＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node1 ＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node3＃ssh- copy-id -i /root/.ssh/id_rsa.pub root @ node5在node3（slave）中：＃ssh-keygen -t rsa ＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node1 ＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node2＃ssh- copy-id -i /root/.ssh/id_rsa.pub root @ node5二，搭建主从复制环境主从复制环境配置过程（1）mysql安装过程略，但是三节点要创建如下链接node1（主），node2（主备从），node3（从）注意：创建如下链接： ln -s / usr / local / mysql / bin / * / usr / local / bin /node1 my.cnfserver-id = 1 binlog-format = ROW log-bin = master-bin log-bin-index = master-bin.index log-slave-updates = true relay_log_purge = 0node2 my.cnfserver-id = 2 binlog-format = ROW log-bin = master-bin log-bin-index = master-bin.index log-slave-updates = true relay_log_purge = 0node3 my.cnfbinlog-format = ROW log-bin = mysql-bin relay-log = slave-relay-bin relay-log-index = slave-relay-bin.index log-slave-updates = true server-id = 11 skip-name- resolve relay_log_purge = 0（2）在node1（Master）上备份一份完整的数据：＃mysqldump -uroot -p123456 –master-data = 2 – 单事务-R – triggers -A> all.sql其中–master-data = 2代表备份时刻记录主的Binlog位置和位置。（3）在node1（Master）上创建复制用户：mysql>授予复制从机*。*到’123456’确定的’repl’@’192.168.1.%’; 刷新权限;（4）查看主库备份时的binlog名称和位置，MASTER_LOG_FILE和MASTER_LOG_POS：＃head -n 30 all.sql |grep’CHANGE MASTER TO’– CHANGE MASTER TO MASTER_LOG_FILE =’master-bin.000004’，MASTER_LOG_POS = 120;（5）把备份复制到192.168.1.122和192.168.1.123＃scp all.sql 192.168.1.122:/root/＃scp all.sql 192.168.1.123:/root/（6）分别在两台服务器上导入备份，执行复制相关命令在node2，node3主机上操作：＃mysql -uroot -p123456 停止从站CHANGE MASTER TO MASTER_HOST =’192.168.1.121’， MASTER_USER =’repl’， MASTER_PASSWORD =’123456’， MASTER_LOG_FILE =’master-bin.000004’， MASTER_LOG_POS = 120;mysql> start slave; 显示从属状态 G创建MHA管理用户，在主上创建。将*。*的所有权限授予’123456’标识为’root’@’192.168.1.%’的权限; 刷新权限;三，配置Keepal VIPvip配置可以采用两种方式，一种通过keepalived的方式管理虚拟ip的浮动;一人是通过脚本方式，本文通过keepalived方式实现1.在node1（Master）与node2（备选主节点）安装keepalived。＃wget的http://www.keepalived.org/software/keepalived-1.2.12.tar.gz ＃焦油XF的keepalived-1.2.12.tar.gz ＃CD的keepalived-1.2.12 ＃的./configure前缀= / usr / local / keepalived ＃make && make install ＃cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/＃cp / usr / local / keepalived / etc / sysconfig / keepalived / etc / sysconfig / ＃mkdir / etc / keepalived ＃cp /usr/local/keepalived/etc/keepalived/keepalived.conf / etc / keepalived / ＃cp / usr / local / keepalived / sbin / keepalived / usr / sbin /配置keepalived的配置文件，在node1（master）上配置操作如下：注意：keepalived配置成备份 – 备份，即IP地址切换后，主起来后IP地址不切换，本文监控脚本由MHA提供，keepalived不提供对mysqld的监控。＃vi /etc/keepalived/keepalived.conf ！保持配置文件global_defs { notification_email { abc@163.com } notification_email_from dba@dbserver.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id MySQL-HA }vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 150 advert_int 1 nopreempt 身份验证{ auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.1.130 } }配置keepalived的配置文件，在node2（备用节点）上配置操作如下：＃vi /etc/keepalived/keepalived.conf ！保持配置文件global_defs { notification_email { abc@163.com } notification_email_from dba@dbserver.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id MySQL-HA }vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 120 advert_int 1 nopreempt 身份验证{ auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.1.130 } }4. node1，node2启动keepalived服务＃service keepalived start ＃chkconfig keepalived on5. node1查看VIP启动情况[root @node1]＃ipa 1：lo： mtu 65536 qdisc noqueue state UNKNOWN link / loopback 00：00：00：00：00：00 brd 00：00：00：00：00 ：00 inet 127.0.0.1/8 scope host lo inet6 :: 1/128 scope host valid_lft forever preferred_lft forever 2：eth0： mtu 1500 qdisc pfifo_fast state UP qlen 1000 link / ether 00：0c ：29：4e：53：71 brd ff：ff：ff：ff：ff：ff inet 192.168.1.121/24 brd 192.168.1.255范围全局eth0 inet 192.168.1.130/32范围全局eth0 inet6 fe80 :: 20c：29ff： fe4e：5371/64范围链接 valid_lft永远preferred_lft永远四，配置MHA监控创建MHA的工作目录，并且创建相关配置文件（在软件包解压后的目录里面有样例配置文件）。＃mkdir -p / etc / masterha ＃mkdir -p / var / log / masterha / app1 ＃cp mha4mysql-manager-0.56 / samples / conf / app1.cnf / etc / masterha /修改app1.cnf配置文件，修改后的文件内容如下：＃cat /etc/masterha/app1.cnf[server default] manager_workdir = / var / log / masterha / app1 manager_log = / var / log / masterha / app1 / manager.log master_binlog_dir = / usr / local / mysql / data / master_ip_failover_script = / usr / local / bin / master_ip_failover master_ip_online_change_script = / usr / local / bin / master_ip_online_change password = 123456 user = root ping_interval = 1 remote_workdir = / tmp repl_password = 123456 repl_user = repl report_script = / usr / local / bin / send_report ssh_user = root[server1] hostname = 192.168.1.121 port = 3306[server2] hostname = 192.168.1.122 port = 3306 candidate_master = 1 check_repl_delay = 0[server3] hostname = 192.168.1.123 port = 3306说明： master_ip_failover_script = / usr / local / bin / master_ip_failover#MHA自动切换执行的脚本，需要修改 master_ip_online_change_script = / usr / local / bin / master_ip_online_change＃手动切换需要执行的脚本，需要修改 report_script = / usr / local / bin / send_report＃切换时发送邮件进行报告，需要修改2.设置中继日志的清除方式（在每个从节点上）：（1）在节点2，节点3从节点上操作：将relay_log_purge = 0加入my.cnf配置文件，前面已经配置。（2）设定定期清理继电器脚本（node2，node3上操作）：＃猫purge_relay_log.sh ＃！/斌/ bash的 用户=根 的passwd = 123456 端口= 3306 LOG_DIR = ‘/数据/ masterha /日志’ WORK_DIR = ‘/数据’ 清除= ‘在/ usr / local / bin目录/ purge_relay_logs’如果[！-d $ log_dir] then mkdir $ log_dir -p fi$ purge –user = $ user –password = $ passwd –disable_relay_log_purge –port = $ port –workdir = $ work_dir >> $ log_dir / purge_relay_logs.log 2>＆1配置定时计划任务＃crontab-e 0 4 * * * / bin / bash /root/purge_relay_log.sh要求把keepalived服务引入MHA，我们只需要修改切换是触发的脚本文件master_ip_failover即可，在该脚本中添加在master发生宕机时对keepalived的处理。（1）编辑脚本/ usr / local / bin / master_ip_failover，修改后如下：＃vi / usr / local / bin / master_ip_failover ＃！/ usr / bin / env perl use strict; 使用警告FATAL =>’all’;使用Getopt :: Long;我的（ $命令，$ ssh_user，$ orig_master_host，$ orig_master_ip， $ orig_master_port，$ new_master_host，$ new_master_ip，$ new_master_port ）;我的$ vip =’192.168.1.130′; 我的$ ssh_start_vip =“/etc/init.d/keepalived start”; 我的$ ssh_stop_vip =“/etc/init.d/keepalived stop”;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 = ‘=> $ 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“禁用旧主机上的VIP：$ orig_master_host n”; ＆stop_vip（）; $ exit_code = 0; }; if（$ @）{ warn“Got Error：$ @ n”; 退出$ exit_code; } exit $ exit_code; } elsif（$ command eq“start”）{ 我的$ exit_code = 10; eval { print“启用VIP – $ vip on the new master – $ new_master_host n”; ＆start_vip（）; $ exit_code = 0; }; if（$ @）{ warn $ @; 退出$ exit_code; } exit $ exit_code; } { el}{ “}”{ “} ”“” 退出0; } else { ＆usage（）; 出口1; } } sub start_vip（）{ `ssh $ ssh_user @ $ new_master_host “$ ssh_start_vip ”`; } ＃一个简单的系统调用，禁用在old_master子上的VIP stop_vip（）{ `ssh $ ssh_user @ $ orig_master_host “$ ssh_stop_vip ”`; }}sub usage { print “用法：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“; }（2）编辑脚本master_ip_online_change，修改后如下：＃！/ usr / bin / env perl＃版权所有（C）2011 DeNA有限公司 ＃＃ 这个程序是免费的软件;您可以根据＃自由软件基金会发布的GNU通用公共许可证的条款重新分配和/或修改 ＃ 许可证的版本2或 ＃（根据您的选择）任何更高版本。 ＃＃ 这个程序是分发的，希望它是有用的， 但没有任何的保证;甚至没有＃适销性或适用于特定用途的默示保证 。有关详细信息，请参阅 ＃GNU通用公共许可证。 ＃＃ 您应该已经收到了GNU通用公共许可证＃的副本 以及该程序;如果不， ##注意：这是一个示例脚本，不完整。根据您的环境修改脚本。使用严格 使用警告FATAL =>’all’;使用Getopt :: Long; 使用MHA :: DBHelper; 使用MHA :: NodeUtil; 使用Time :: HiRes qw（sleep gettimeofday tv_interval）; 使用Data :: Dumper;我的$ _tstart; 我的$ _running_interval = 0.1; 我的（ $命令，$ 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 ） 我的$ vip =’192.168.1.130/24′; 我的$ key =’1′; 我的$ ssh_start_vip =“/ sbin / ifconfig eth0：$ key $ vip”; 我的$ ssh_stop_vip =“/ sbin / ifconfig eth0：$ key down”; 我的$ orig_master_ssh_port = 22; 我的$ new_master_ssh_port = 22; exit＆main（）;sub current_time_us { my（$ sec，$ microsec）= gettimeofday（）; 我的$ curdate = localtime（$ sec）; 返回$ 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; 我的$ my_connection_id = shift; 我的$ running_time_threshold = shift; 我的$ type = shift; $ running_time_threshold = 0，除非（$ running_time_threshold）; $ type = 0，除非（$ type）; 我的@threads; 我的$ sth = $ dbh-> prepare（“SHOW PROCESSLIST”）; $ sth-> execute（）; while（my $ ref = $ sth-> fetchrow_hashref（））{ my $ id = $ ref – > {Id}; 我的$ user = $ ref – > {User}; 我的$ host = $ ref – > {Host}; 我的$ command = $ ref – > {Command}; 我的$ state = $ ref – > {State}; 我的$ query_time = $ ref – > {Time}; 我的$ info = $ ref – > {Info}; $ info =s / ^ s *（。*？） s * $ / $ 1 / if defined（$ info）; next if（$ my_connection_id == $ id）; next if（defined（$ query_time）&& $ query_time next if（defined（$ command）&& $ command eq“Binlog Dump”）; next if（defined（$ user）&& $ user eq“system user”）; 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）; } 推送@threads，$ ref; } return @threads; }sub main { if（$ command eq“stop”）{ ##正当地杀死当前主机上的连接 ＃1.在新主机 ＃2上设置read_only = 1。DROP USER使得没有应用用户可以建立新的连接 ＃3。在当前主机 ＃4上设置read_only =1。杀死当前查询 ＃*任何数据库访问失败都会导致脚本死机 。 我的$ exit_code = 1; eval { ##在新主机上设置read_only = 1（以避免意外） 我的$ 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）; 打印current_time_us（）。“设置read_only在新的主人..”; $ new_master_handler-> enable_read_only（）; if（$ new_master_handler-> is_read_only（））{ print“ok。 n”; } else { die“Failed！ n”; } $ new_master_handler-> disconnect（）; ＃连接到原始主机，如果发生任何数据库错误，则会死亡 $ orig_master_handler = new MHA :: DBHelper（）; $ orig_master_handler-> connect（$ orig_master_ip，$ orig_master_port， $ orig_master_user，$ orig_master_password，1）; ##删除应用程序用户，以便没有人可以连接。事先禁用每会话binlog $ orig_master_handler-> disable_log_bin_local（）; 打印current_time_us（）。“在原始主机上吸引应用用户.. n”; #FIXME_xxx_drop_app_user（$ orig_master_handler）; 等待N * 100毫秒，以便当前的连接可以退出 我的$ time_until_read_only = 15; $ _tstart = [gettimeofday]; 我的@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等待所有正在运行的％d线程断开连接..（最大％d毫秒） n” current_time_us（），$＃threads + 1，$ time_until_read_only * 100; if（$＃threads print Data :: Dumper-> new（[$ _]） – > 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}）; }} ##在当前主设备上设置read_only = 1，以便没有人（SUPER除外）可以写入 print_time_us（）。“在原始主机上设置read_only = 1”。 $ orig_master_handler-> enable_read_only（）; if（$ orig_master_handler-> is_read_only（））{ print“ok。 n”; } else { die“Failed！ n”; }} 等待M * 100毫秒，以便当前的更新查询可以完成 我的$ 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等待所有运行的％d查询断开连接..（最大％d毫秒） n” current_time_us（），$＃threads + 1，$ time_until_kill_threads * 100; if（$＃threads print Data :: Dumper-> new（[$ _]） – > 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(); $orig_master_handler->disconnect(); ## After finishing the script, MHA executes FLUSH TABLES WITH READ LOCK eval { `ssh -p$orig_master_ssh_port $orig_master_ssh_user@$orig_master_host ” $ssh_stop_vip “`; }; if ($@) { warn $@; } $exit_code = 0; }; if ($@) { 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(); $new_master_handler->disconnect(); ## Update master ip on the catalog database, etc `ssh -p$new_master_ssh_port $new_master_ssh_user@$new_master_host ” $ssh_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开发云主机域名 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=portn”; die; }(3) 编辑脚本send_report，修改后如下:#!/usr/bin/perluse strict; use warnings FATAL => ‘all’; use Mail::Sender; use Getopt::Long;#new_master_host and new_slave_hosts are set only when recovering master succeeded my ( $dead_master_host, $new_master_host, $new_slave_hosts, $subject, $body ); my $smtp=’smtp.163.com’; my $mail_from=’xxxx’; my $mail_user=’xxxxx’; my $mail_pass=’xxxxx’; my $mail_to=[‘xxxx’,’xxxx’]; GetOptions( ‘orig_master_host=s’ => $dead_master_host, ‘new_master_host=s’ => $new_master_host, ‘new_slave_hosts=s’ => $new_slave_hosts, ‘subject=s’ => $subject, ‘body=s’ => $body, );mailToContacts($smtp,$mail_from,$mail_user,$mail_pass,$mail_to,$subject,$body);sub mailToContacts { my ( $smtp, $mail_from, $user, $passwd, $mail_to, $subject, $msg ) = @_; open my $DEBUG, “> /tmp/monitormail.log” or die “Can’t open the debug file:$!n”; my $sender = new Mail::Sender { ctype => ‘text/plain; charset=utf-8’, encoding => ‘utf-8’, smtp => $smtp, from => $mail_from, auth => ‘LOGIN’, TLS_allowed => ‘0’, authid => $user, authpwd => $passwd, to => $mail_to, subject => $subject, debug => $DEBUG }; $sender->MailMsg( { msg => $msg, debug => $DEBUG } ) or print $Mail::Sender::Error; return 1; }# Do whatever you want hereexit 0;五、MHA的日常管理1. 检查SSH配置(node5 Monitor 监控节点上操作)，如下：# masterha_check_ssh –conf=/etc/masterha/app1.cnfSun May 1 22:05:12 2016 – [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun May 1 22:05:12 2016 – [info] Reading application default configuration from /etc/masterha/app1.cnf.. Sun May 1 22:05:12 2016 – [info] Reading server configuration from /etc/masterha/app1.cnf.. Sun May 1 22:05:12 2016 – [info] Starting SSH connection tests.. Sun May 1 22:05:14 2016 – [debug] Sun May 1 22:05:12 2016 – [debug] Connecting via SSH from root@192.168.1.121(192.168.1.121:22) to root@192.168.1.122(192.168.1.122:22).. Sun May 1 22:05:13 2016 – [debug] ok. Sun May 1 22:05:13 2016 – [debug] Connecting via SSH from root@192.168.1.121(192.168.1.121:22) to root@192.168.1.123(192.168.1.123:22).. Sun May 1 22:05:13 2016 – [debug] ok. Sun May 1 22:05:14 2016 – [debug] Sun May 1 22:05:13 2016 – [debug] Connecting via SSH from root@192.168.1.122(192.168.1.122:22) to root@192.168.1.121(192.168.1.121:22).. Sun May 1 22:05:13 2016 – [debug] ok. Sun May 1 22:05:13 2016 – [debug] Connecting via SSH from root@192.168.1.122(192.168.1.122:22) to root@192.168.1.123(192.168.1.123:22).. Sun May 1 22:05:14 2016 – [debug] ok. Sun May 1 22:05:14 2016 – [debug] Sun May 1 22:05:13 2016 – [debug] Connecting via SSH from root@192.168.1.123(192.168.1.123:22) to root@192.168.1.121(192.168.1.121:22).. Sun May 1 22:05:14 2016 – [debug] ok. Sun May 1 22:05:14 2016 – [debug] Connecting via SSH from root@192.168.1.123(192.168.1.123:22) to root@192.168.1.122(192.168.1.122:22).. Sun May 1 22:05:14 2016 – [debug] ok. Sun May 1 22:05:14 2016 – [info]All SSH connection tests passed successfully.2. 检查整个复制环境状况(node5 监控节点上操作)，如下：# masterha_check_repl –conf=/etc/masterha/app1.cnfSun May 1 22:46:44 2016 – [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Sun May 1 22:46:44 2016 – [info] Reading application default configuration from /etc/masterha/app1.cnf.. Sun May 1 22:46:44 2016 – [info] Reading server configuration from /etc/masterha/app1.cnf.. Sun May 1 22:46:44 2016 – [info] MHA::MasterMonitor version 0.56. Sun May 1 22:46:45 2016 – [info] GTID failover mode = 0 Sun May 1 22:46:45 2016 – [info] Dead Servers: Sun May 1 22:46:45 2016 – [info] Alive Servers: Sun May 1 22:46:45 2016 – [info] 192.168.1.121(192.168.1.121:3306) Sun May 1 22:46:45 2016 – [info] 192.168.1.122(192.168.1.122:3306) Sun May 1 22:46:45 2016 – [info] 192.168.1.123(192.168.1.123:3306) Sun May 1 22:46:45 2016 – [info] Alive Slaves: Sun May 1 22:46:45 2016 – [info] 192.168.1.122(192.168.1.122:3306) Version=5.6.29-log (oldest major version between slaves) log-bin:enabled Sun May 1 22:46:45 2016 – [info] Replicating from 192.168.1.121(192.168.1.121:3306) Sun May 1 22:46:45 2016 – [info] Primary candidate for the new Master (candidate_master is set) Sun May 1 22:46:45 2016 – [info] 192.168.1.123(192.168.1.123:3306) Version=5.6.29-log (oldest major version between slaves) log-bin:enabled Sun May 1 22:46:45 2016 – [info] Replicating from 192.168.1.121(192.168.1.121:3306) Sun May 1 22:46:45 2016 – [info] Current Alive Master: 192.168.1.121(192.168.1.121:3306) Sun May 1 22:46:45 2016 – [info] Checking slave configurations.. Sun May 1 22:46:45 2016 – [info] read_only=1 is not set on slave 192.168.1.122(192.168.1.122:3306). Sun May 1 22:46:45 2016 – [warning] relay_log_purge=0 is not set on slave 192.168.1.122(192.168.1.122:3306). Sun May 1 22:46:45 2016 – [info] read_only=1 is not set on slave 192.168.1.123(192.168.1.123:3306). Sun May 1 22:46:45 2016 – [warning] relay_log_purge=0 is not set on slave 192.168.1.123(192.168.1.123:3306). Sun May 1 22:46:45 2016 – [info] Checking replication filtering settings.. Sun May 1 22:46:45 2016 – [info] binlog_do_db= , binlog_ignore_db= Sun May 1 22:46:45 2016 – [info] Replication filtering check ok. Sun May 1 22:46:45 2016 – [info] GTID (with auto-pos) is not supported Sun May 1 22:46:45 2016 – [info] Starting SSH connection tests.. Sun May 1 22:46:46 2016 – [info] All SSH connection tests passed successfully. Sun May 1 22:46:46 2016 – [info] Checking MHA Node version.. Sun May 1 22:46:47 2016 – [info] Version check ok. Sun May 1 22:46:47 2016 – [info] Checking SSH publickey authentication settings on the current master.. Sun May 1 22:46:47 2016 – [info] HealthCheck: SSH to 192.168.1.121 is reachable. Sun May 1 22:46:47 2016 – [info] Master MHA Node version is 0.56. Sun May 1 22:46:47 2016 – [info] Checking recovery script configurations on 192.168.1.121(192.168.1.121:3306).. Sun May 1 22:46:47 2016 – [info] Executing command: save_binary_logs –command=test –start_pos=4 –binlog_dir=/usr/local/mysql/data/ –output_file=/tmp/save_binary_logs_test –manager_version=0.56 –start_file=master-bin.000008 Sun May 1 22:46:47 2016 – [info] Connecting to root@192.168.1.121(192.168.1.121:22).. Creating /tmp if not exists.. ok. Checking output directory is accessible or not.. ok. Binlog found at /usr/local/mysql/data/, up to master-bin.000008 Sun May 1 22:46:48 2016 – [info] Binlog setting check done. Sun May 1 22:46:48 2016 – [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers.. Sun May 1 22:46:48 2016 – [info] Executing command : apply_diff_relay_logs –command=test –slave_user=’root’ –slave_host=192.168.1.122 –slave_ip=192.168.1.122 –slave_port=3306 –workdir=/tmp –target_version=5.6.29-log –manager_version=0.56 –relay_log_info=/usr/local/mysql/data/relay-log.info –relay_dir=/usr/local/mysql/data/ –slave_pass=xxx Sun May 1 22:46:48 2016 – [info] Connecting to root@192.168.1.122(192.168.1.122:22).. Checking slave recovery environment settings.. Opening /usr/local/mysql/data/relay-log.info … ok. Relay log found at /usr/local/mysql/data, up to node2-relay-bin.000002 Temporary relay log file is /usr/local/mysql/data/node2-relay-bin.000002 Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure. done. Testing mysqlbinlog output.. done. Cleaning up test file(s).. done. Sun May 1 22:46:48 2016 – [info] Executing command : apply_diff_relay_logs –command=test –slave_user=’root’ –slave_host=192.168.1.123 –slave_ip=192.168.1.123 –slave_port=3306 –workdir=/tmp –target_version=5.6.29-log –manager_version=0.56 –relay_log_info=/usr/local/mysql/data/relay-log.info –relay_dir=/usr/local/mysql/data/ –slave_pass=xxx Sun May 1 22:46:48 2016 – [info] Connecting to root@192.168.1.123(192.168.1.123:22).. Checking slave recovery environment settings.. Opening /usr/local/mysql/data/relay-log.info … ok. Relay log found at /usr/local/mysql/data, up to slave-relay-bin.000012 Temporary relay log file is /usr/local/mysql/data/slave-relay-bin.000012 Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure. done. Testing mysqlbinlog output.. done. Cleaning up test file(s).. done. Sun May 1 22:46:48 2016 – [info] Slaves settings check done. Sun May 1 22:46:48 2016 – [info] 192.168.1.121(192.168.1.121:3306) (current master) +–192.168.1.122(192.168.1.122:3306) +–192.168.1.123(192.168.1.123:3306)Sun May 1 22:46:48 2016 – [info] Checking replication health on 192.168.1.122.. Sun May 1 22:46:48 2016 – [info] ok. Sun May 1 22:46:48 2016 – [info] Checking replication health on 192.168.1.123.. Sun May 1 22:46:48 2016 – [info] ok. Sun May 1 22:46:48 2016 – [info] Checking master_ip_failover_script status: Sun May 1 22:46:48 2016 – [info] /usr/local/bin/master_ip_failover –command=status –ssh_user=root –orig_master_host=192.168.1.121 –orig_master_ip=192.168.1.121 –orig_master_port=3306IN SCRIPT TEST====/etc/init.d/keepalived stop==/etc/init.d/keepalived start===Checking the Status of the script.. OK Sun May 1 22:46:48 2016 – [info] OK. Sun May 1 22:46:48 2016 – [warning] shutdown_script is not defined. Sun May 1 22:46:48 2016 – [info] Got exit code 0 (Not master dead).MySQL Replication Health is OK. [root@node5 masterha]#3. 开启MHA Manager监控(node5操作)如下：# mkdir -p /var/log/masterha/app1/ # nohup masterha_manager –conf=/etc/masterha/app1.cnf –remove_dead_master_conf –ignore_last_failover /var/log/masterha/app1/manager.log 2>&1 &参数说明： –remove_dead_master_conf #该参数代表当发生主从切换后，老的主库的ip将会从配置文件中移除。 –manger_log #日志存放位置 –ignore_last_failover #在缺省情况下，如果MHA检测到连续发生宕机，会生成app1.failover.complete文件，会造成MHA管理进程无法启动。4. 查看MHA Manager监控是否正常：# masterha_check_status –conf=/etc/masterha/app1.cnf app1 (pid:2480) is running(0:PING_OK), master:192.168.1.1215. 查看启动日志(node5操作)如下：# tail -n20 /var/log/masterha/app1/manager.log6. 关闭MHA Manage监控：(1) 关闭# masterha_stop –conf=/etc/masterha/app1.cnf(2) 启动# nohup masterha_manager –conf=/etc/masterha/app1.cnf –remove_dead_master_conf –ignore_last_failover /var/log/masterha/app1/manager.log 2>&1六、MHA Failover切换1. 自动Failover切换(1) 模拟master mysql关闭 (2) VIP将会切换到node2 (3) /etc/masterha/app1.cnf中将原主服务器配置文件清掉。 (4) masterha_manager监控进程会自动退出关闭，并在/var/log/masterha/app1下生成app1.failover.complete文件，manager.log会记录全过程，从服务器会自动从新的主服务器复制。 (5) 原主服务器mysqld启动的，需要清掉/var/log/masterha/app1下生成app1.failover.complete文件，添加node1配置文件到/etc/masterha/app1.cnf，通过manager.log中的记录的故障点，重新同步主服务器，成为从节点。2. 手动Failover切换(1) 先停MHA Manager进程。 masterha_stop –conf=/etc/masterha/app1.cnf (2) 停掉master mysqld (3) 手动切换，在Manager主机上操作如下： # masterha_master_switch –master_state=dead –conf=/etc/masterha/app1.cnf –dead_master_host=192.168.1.122 –dead_master_port=3306 –new_master_host=192.168.1.121 –new_master_port=3306 –ignore_last_failover通过观察日志可以观察切换全过程。 (4) 如上节方式恢复节点为从服务器。3. 正常运行情况下切换(Master正在运行)等补充。4. 小结通过对MMM，MHA的环境搭建测试，MHA由于采用复制架构，原理简单，在一些对数据要求比较高的环境，为了保证可靠性，最好与半同步结合使用。
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