1、故障測試
1.1 操作流程
# 追蹤mha-manager日誌 [root@db03 ~]# tail -f /var/log/mha/app1/manager # 關閉主庫 [root@db01 ~]# /etc/init.d/mysqld stop
1.2 日誌檢視
# 確認主庫當機部分 Wed Jun 2 16:55:42 2021 - [warning] Got error on MySQL select ping: 1053 (Server shutdown in progress) Wed Jun 2 16:55:42 2021 - [info] Executing SSH check script: exit 0 Wed Jun 2 16:55:42 2021 - [info] HealthCheck: SSH to 192.168.10.51 is reachable. Wed Jun 2 16:55:44 2021 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.10.51' (111)) Wed Jun 2 16:55:44 2021 - [warning] Connection failed 2 time(s).. Wed Jun 2 16:55:46 2021 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.10.51' (111)) Wed Jun 2 16:55:46 2021 - [warning] Connection failed 3 time(s).. Wed Jun 2 16:55:48 2021 - [warning] Got error on MySQL connect: 2003 (Can't connect to MySQL server on '192.168.10.51' (111)) Wed Jun 2 16:55:48 2021 - [warning] Connection failed 4 time(s).. Wed Jun 2 16:55:48 2021 - [warning] Master is not reachable from health checker! Wed Jun 2 16:55:48 2021 - [warning] Master 192.168.10.51(192.168.10.51:3306) is not reachable! # 確認各節點狀態 Wed Jun 2 16:55:48 2021 - [warning] SSH is reachable. Wed Jun 2 16:55:48 2021 - [info] Connecting to a master server failed. Reading configuration file /etc/masterha_default.cnf and /etc/mha/app1.cnf again, and trying to connect to all servers to check server status.. Wed Jun 2 16:55:48 2021 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Wed Jun 2 16:55:48 2021 - [info] Reading application default configuration from /etc/mha/app1.cnf.. Wed Jun 2 16:55:48 2021 - [info] Reading server configuration from /etc/mha/app1.cnf.. Wed Jun 2 16:55:49 2021 - [info] GTID failover mode = 1 Wed Jun 2 16:55:49 2021 - [info] Dead Servers: Wed Jun 2 16:55:49 2021 - [info] 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:49 2021 - [info] Alive Servers: Wed Jun 2 16:55:49 2021 - [info] 192.168.10.52(192.168.10.52:3306) Wed Jun 2 16:55:49 2021 - [info] 192.168.10.53(192.168.10.53:3306) Wed Jun 2 16:55:49 2021 - [info] Alive Slaves: Wed Jun 2 16:55:49 2021 - [info] 192.168.10.52(192.168.10.52:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:49 2021 - [info] GTID ON Wed Jun 2 16:55:49 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:49 2021 - [info] Primary candidate for the new Master (candidate_master is set) Wed Jun 2 16:55:49 2021 - [info] 192.168.10.53(192.168.10.53:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:49 2021 - [info] GTID ON Wed Jun 2 16:55:49 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:49 2021 - [info] Not candidate for the new Master (no_master is set) Wed Jun 2 16:55:49 2021 - [info] Checking slave configurations.. Wed Jun 2 16:55:49 2021 - [info] read_only=1 is not set on slave 192.168.10.52(192.168.10.52:3306). Wed Jun 2 16:55:49 2021 - [info] read_only=1 is not set on slave 192.168.10.53(192.168.10.53:3306). Wed Jun 2 16:55:49 2021 - [info] Checking replication filtering settings.. Wed Jun 2 16:55:49 2021 - [info] Replication filtering check ok. Wed Jun 2 16:55:49 2021 - [info] Master is down! Wed Jun 2 16:55:49 2021 - [info] Terminating monitoring script. Wed Jun 2 16:55:49 2021 - [info] Got exit code 20 (Master dead). Wed Jun 2 16:55:49 2021 - [info] MHA::MasterFailover version 0.58. Wed Jun 2 16:55:49 2021 - [info] Starting master failover. Wed Jun 2 16:55:49 2021 - [info] Wed Jun 2 16:55:49 2021 - [info] * Phase 1: Configuration Check Phase.. Wed Jun 2 16:55:49 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] GTID failover mode = 1 Wed Jun 2 16:55:51 2021 - [info] Dead Servers: Wed Jun 2 16:55:51 2021 - [info] 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:51 2021 - [info] Checking master reachability via MySQL(double check)... Wed Jun 2 16:55:51 2021 - [info] ok. Wed Jun 2 16:55:51 2021 - [info] Alive Servers: Wed Jun 2 16:55:51 2021 - [info] 192.168.10.52(192.168.10.52:3306) Wed Jun 2 16:55:51 2021 - [info] 192.168.10.53(192.168.10.53:3306) Wed Jun 2 16:55:51 2021 - [info] Alive Slaves: Wed Jun 2 16:55:51 2021 - [info] 192.168.10.52(192.168.10.52:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:51 2021 - [info] GTID ON Wed Jun 2 16:55:51 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:51 2021 - [info] Primary candidate for the new Master (candidate_master is set) Wed Jun 2 16:55:51 2021 - [info] 192.168.10.53(192.168.10.53:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:51 2021 - [info] GTID ON Wed Jun 2 16:55:51 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:51 2021 - [info] Not candidate for the new Master (no_master is set) Wed Jun 2 16:55:51 2021 - [info] Starting GTID based failover. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] ** Phase 1: Configuration Check Phase completed. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] * Phase 2: Dead Master Shutdown Phase.. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] Forcing shutdown so that applications never connect to the current master.. Wed Jun 2 16:55:51 2021 - [info] Executing master IP deactivation script: Wed Jun 2 16:55:51 2021 - [info] /usr/local/bin/master_ip_failover --orig_master_host=192.168.10.51 --orig_master_ip=192.168.10.51 --orig_master_port=3306 --command=stopssh --ssh_user=root # VIP狀態檢查，日誌補償（此部分未發現日誌缺失） IN SCRIPT TEST====/sbin/ifconfig eth0:1 down==/sbin/ifconfig eth0:1 192.168.10.49/24=== Disabling the VIP on old master: 192.168.10.51 SIOCSIFFLAGS: Cannot assign requested address Wed Jun 2 16:55:51 2021 - [info] done. Wed Jun 2 16:55:51 2021 - [warning] shutdown_script is not set. Skipping explicit shutting down of the dead master. Wed Jun 2 16:55:51 2021 - [info] * Phase 2: Dead Master Shutdown Phase completed. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] * Phase 3: Master Recovery Phase.. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] * Phase 3.1: Getting Latest Slaves Phase.. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] The latest binary log file/position on all slaves is mysql-bin.000005:196 Wed Jun 2 16:55:51 2021 - [info] Latest slaves (Slaves that received relay log files to the latest): Wed Jun 2 16:55:51 2021 - [info] 192.168.10.52(192.168.10.52:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:51 2021 - [info] GTID ON Wed Jun 2 16:55:51 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:51 2021 - [info] Primary candidate for the new Master (candidate_master is set) Wed Jun 2 16:55:51 2021 - [info] 192.168.10.53(192.168.10.53:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:51 2021 - [info] GTID ON Wed Jun 2 16:55:51 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:51 2021 - [info] Not candidate for the new Master (no_master is set) Wed Jun 2 16:55:51 2021 - [info] The oldest binary log file/position on all slaves is mysql-bin.000005:196 Wed Jun 2 16:55:51 2021 - [info] Oldest slaves: Wed Jun 2 16:55:51 2021 - [info] 192.168.10.52(192.168.10.52:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:51 2021 - [info] GTID ON Wed Jun 2 16:55:51 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:51 2021 - [info] Primary candidate for the new Master (candidate_master is set) Wed Jun 2 16:55:51 2021 - [info] 192.168.10.53(192.168.10.53:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:51 2021 - [info] GTID ON Wed Jun 2 16:55:51 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:51 2021 - [info] Not candidate for the new Master (no_master is set) Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] * Phase 3.3: Determining New Master Phase.. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] Searching new master from slaves.. Wed Jun 2 16:55:51 2021 - [info] Candidate masters from the configuration file: Wed Jun 2 16:55:51 2021 - [info] 192.168.10.52(192.168.10.52:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:51 2021 - [info] GTID ON Wed Jun 2 16:55:51 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:51 2021 - [info] Primary candidate for the new Master (candidate_master is set) Wed Jun 2 16:55:51 2021 - [info] Non-candidate masters: Wed Jun 2 16:55:51 2021 - [info] 192.168.10.53(192.168.10.53:3306) Version=8.0.20 (oldest major version between slaves) log-bin:enabled Wed Jun 2 16:55:51 2021 - [info] GTID ON Wed Jun 2 16:55:51 2021 - [info] Replicating from 192.168.10.51(192.168.10.51:3306) Wed Jun 2 16:55:51 2021 - [info] Not candidate for the new Master (no_master is set) Wed Jun 2 16:55:51 2021 - [info] Searching from candidate_master slaves which have received the latest relay log events.. # 選主結束，開始切換 Wed Jun 2 16:55:51 2021 - [info] New master is 192.168.10.52(192.168.10.52:3306) Wed Jun 2 16:55:51 2021 - [info] Starting master failover.. Wed Jun 2 16:55:51 2021 - [info] From: 192.168.10.51(192.168.10.51:3306) (current master) +--192.168.10.52(192.168.10.52:3306) +--192.168.10.53(192.168.10.53:3306) To: 192.168.10.52(192.168.10.52:3306) (new master) +--192.168.10.53(192.168.10.53:3306) Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] * Phase 3.3: New Master Recovery Phase.. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] Waiting all logs to be applied.. Wed Jun 2 16:55:51 2021 - [info] done. Wed Jun 2 16:55:51 2021 - [info] Getting new master's binlog name and position.. Wed Jun 2 16:55:51 2021 - [info] mysql-bin.000005:196 Wed Jun 2 16:55:51 2021 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='192.168.10.52', MASTER_PORT=3306, MASTER_AUTO_POSITION=1, MASTER_USER='rep', MASTER_PASSWORD='xxx'; Wed Jun 2 16:55:51 2021 - [info] Master Recovery succeeded. File:Pos:Exec_Gtid_Set: mysql-bin.000005, 196, f4682075-c1b9-11eb-86b2-000c2934cc5a:1-21 Wed Jun 2 16:55:51 2021 - [info] Executing master IP activate script: Wed Jun 2 16:55:51 2021 - [info] /usr/local/bin/master_ip_failover --command=start --ssh_user=root --orig_master_host=192.168.10.51 --orig_master_ip=192.168.10.51 --orig_master_port=3306 --new_master_host=192.168.10.52 --new_master_ip=192.168.10.52 --new_master_port=3306 --new_master_user='mha' --new_master_password=xxx Unknown option: new_master_user Unknown option: new_master_password # 切換vip，處理manager配置檔案（將db1踢出mha環境） IN SCRIPT TEST====/sbin/ifconfig eth0:1 down==/sbin/ifconfig eth0:1 192.168.10.49/24=== Enabling the VIP - 192.168.10.49/24 on the new master - 192.168.10.52 Wed Jun 2 16:55:51 2021 - [info] OK. Wed Jun 2 16:55:51 2021 - [info] ** Finished master recovery successfully. Wed Jun 2 16:55:51 2021 - [info] * Phase 3: Master Recovery Phase completed. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] * Phase 4: Slaves Recovery Phase.. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] * Phase 4.1: Starting Slaves in parallel.. Wed Jun 2 16:55:51 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] -- Slave recovery on host 192.168.10.53(192.168.10.53:3306) started, pid: 48882. Check tmp log /var/log/mha/app1/192.168.10.53_3306_20210602165549.log if it takes time.. Wed Jun 2 16:55:53 2021 - [info] Wed Jun 2 16:55:53 2021 - [info] Log messages from 192.168.10.53 ... Wed Jun 2 16:55:53 2021 - [info] Wed Jun 2 16:55:51 2021 - [info] Resetting slave 192.168.10.53(192.168.10.53:3306) and starting replication from the new master 192.168.10.52(192.168.10.52:3306).. Wed Jun 2 16:55:51 2021 - [info] Executed CHANGE MASTER. Wed Jun 2 16:55:52 2021 - [info] Slave started. Wed Jun 2 16:55:52 2021 - [info] gtid_wait(f4682075-c1b9-11eb-86b2-000c2934cc5a:1-21) completed on 192.168.10.53(192.168.10.53:3306). Executed 0 events. Wed Jun 2 16:55:53 2021 - [info] End of log messages from 192.168.10.53. Wed Jun 2 16:55:53 2021 - [info] -- Slave on host 192.168.10.53(192.168.10.53:3306) started. Wed Jun 2 16:55:53 2021 - [info] All new slave servers recovered successfully. Wed Jun 2 16:55:53 2021 - [info] Wed Jun 2 16:55:53 2021 - [info] * Phase 5: New master cleanup phase.. Wed Jun 2 16:55:53 2021 - [info] Wed Jun 2 16:55:53 2021 - [info] Resetting slave info on the new master.. Wed Jun 2 16:55:53 2021 - [info] 192.168.10.52: Resetting slave info succeeded. Wed Jun 2 16:55:53 2021 - [info] Master failover to 192.168.10.52(192.168.10.52:3306) completed successfully. Wed Jun 2 16:55:53 2021 - [info] Deleted server1 entry from /etc/mha/app1.cnf . Wed Jun 2 16:55:53 2021 - [info] # 切換完成 ----- Failover Report ----- app1: MySQL Master failover 192.168.10.51(192.168.10.51:3306) to 192.168.10.52(192.168.10.52:3306) succeeded Master 192.168.10.51(192.168.10.51:3306) is down! Check MHA Manager logs at db3:/var/log/mha/app1/manager for details. Started automated(non-interactive) failover. Invalidated master IP address on 192.168.10.51(192.168.10.51:3306) Selected 192.168.10.52(192.168.10.52:3306) as a new master. 192.168.10.52(192.168.10.52:3306): OK: Applying all logs succeeded. 192.168.10.52(192.168.10.52:3306): OK: Activated master IP address. 192.168.10.53(192.168.10.53:3306): OK: Slave started, replicating from 192.168.10.52(192.168.10.52:3306) 192.168.10.52(192.168.10.52:3306): Resetting slave info succeeded. Master failover to 192.168.10.52(192.168.10.52:3306) completed successfully.
2、主動切換
故障後進行主動切換，檢視主從狀態和vip環境確認
主庫已切換至db2
[root@db3 ~ ]# mysql -uroot -p123456 -e "show slave status\G;" |grep Master_Host mysql: [Warning] Using a password on the command line interface can be insecure. Master_Host: 192.168.10.52 # 主庫已變更
vip已切換至db2
[root@db2 ~]# ip a |grep eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 inet 192.168.10.52/24 brd 192.168.10.255 scope global noprefixroute eth0 inet 192.168.10.49/24 brd 192.168.10.255 scope global secondary eth0:1
3、線上切換
3.1 只切換角色
3.1.1 切換命令
masterha_master_switch --conf=/etc/mha/app1.cnf --master_state=alive --new_master_host=192.168.10.51 --orig_master_is_new_slave --running_updates_limit=10000 master_ip_online_change_script is not defined. If you do not disable writes on the current master manually, applications keep writing on the current master. Is it ok to proceed? (yes/NO): yes # 命令解析 --conf=/etc/mha/app1.cnf # 指定配置檔案 --master_state=alive # 主庫線上的情況下進行切換 --new_master_host=192.168.10.51 # 指定新主ip --orig_master_is_new_slave # 原主庫改為從庫 running_updates_limit=10000 # 網路延時(ping值)超過1w毫秒不進行切換
3.1.2 注意內容
此命令一般不會在生產環境使用，只用於測試
1、需要關閉mha-manager，不然切換無法執行成功。報錯如下：
Tue Jun 8 10:03:54 2021 - [error][/usr/share/perl5/vendor_perl/MHA/MasterRotate.pm, ln143] Getting advisory lock failed on the current master. MHA Monitor runs on the current master. Stop MHA Manager/Monitor and try again. Tue Jun 8 10:03:54 2021 - [error][/usr/share/perl5/vendor_perl/MHA/ManagerUtil.pm, ln177] Got ERROR: at /usr/bin/masterha_master_switch line 53.
2、需要將原主庫鎖住Flush table with read lock，使其只讀。因為在切換完主從後，vip尚未切換，此段時間資料還會寫入到原主庫，導致資料不一致。警告如下：
It is better to execute FLUSH NO_WRITE_TO_BINLOG TABLES on the master before switching. Is it ok to execute on 192.168.10.52(192.168.10.52:3306)? (YES/no): yes
3、需要手工切換vip
4、需要重新拉取主庫binlog（binlog-server）
3.2 指令碼功能實現
功能: 線上切換時，自動鎖原主庫，VIP自動切換
3.2.1 準備指令碼
vim /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 = "10.0.0.55"; my $key = "1"; my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip"; my $ssh_stop_vip = "/sbin/ifconfig ens33:$key $vip down"; my $ssh_Bcast_arp= "/sbin/arping -I ens33 -c 3 -A 10.0.0.55"; ########################################################################### 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 "disable 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 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 "enable 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; } } ########################################################################### sub start_vip() { `ssh $new_master_ssh_user\@$new_master_host \" $ssh_start_vip \"`; } 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 --new_master_host=host --new_master_ip=ip --new_master_port=port\n"; die; }
根據自身環境修改以下內容（與vip指令碼設定一致）
my $vip = '192.168.10.49/24'; # vip網段，與各節點伺服器網段一致。 my $key = '1'; # 虛擬網路卡eth0:1 的 1 my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip"; # 網路卡按照實際網路卡名稱填寫 my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down"; # 網路卡按照實際網路卡名稱填寫 my $ssh_Bcast_arp= "/sbin/arping -I eth0 -c 3 -A 192.168.10.49"; # 重新宣告mac地址，arp
3.2.2 mha配置檔案
修改mha-manager配置檔案，增加一下內容
vim /etc/mha/app1.cnf
master_ip_online_change_script=/usr/local/bin/master_ip_online_change
3.2.3 關停mha服務
masterha_stop --conf=/etc/mha/app1.cnf
3.2.4 檢查repl
masterha_check_repl --conf=/etc/mha/app1.cnf
3.2.5 線上切換
masterha_master_switch --conf=/etc/mha/app1.cnf --master_state=alive --new_master_host=192.168.10.51 --orig_master_is_new_slave --running_updates_limit=10000 From: 192.168.10.52(192.168.10.52:3306) (current master) +--192.168.10.51(192.168.10.51:3306) +--192.168.10.53(192.168.10.53:3306) To: 192.168.10.51(192.168.10.51:3306) (new master) +--192.168.10.53(192.168.10.53:3306) +--192.168.10.52(192.168.10.52:3306) Tue Jun 8 10:44:10 2021 - [info] Switching master to 192.168.10.51(192.168.10.51:3306) completed successfully. # 切換成功
3.2.6 確認vip
[root@db1 ~]# ip a |grep eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 inet 192.168.10.51/24 brd 192.168.10.255 scope global noprefixroute eth0 inet 192.168.10.49/24 brd 192.168.10.255 scope global secondary eth0:1
3.2.7 重構binlog-server
1、查詢當前salve當前拿取的binlog日誌
[root@db3 ~]# mysql -uroot -p123456 -e "show slave status \G"|grep "Master_Log" Master_Log_File: mysql-bin.000006 Read_Master_Log_Pos: 196 Relay_Master_Log_File: mysql-bin.000006 Exec_Master_Log_Pos: 196
2、關停當前binlog-server服務，清除binlog-server目錄里拉取的日誌檔案
[root@db03 bin]# ps -ef |grep mysqlbinlog root 28144 16272 0 17:50 pts/1 00:00:00 mysqlbinlog -R --host=192.168.10.52 --user=mha --password=x x --raw --stop-never mysql-bin.000005 root 28529 16272 0 18:03 pts/1 00:00:00 grep --color=auto mysqlbinlog [root@db03 bin]# kill -9 28144 [root@db03 bin]# cd /data/binlog_server/ [root@db03 binlog_server]# ll total 4 -rw-r----- 1 root root 194 Apr 1 17:50 mysql-bin.000005 [root@db03 binlog_server]# rm -rf * [1] 28534
3、進入日誌目錄，重新啟動binlog-server守護程序
[root@db03 bin]# cd /data/binlog_server/ [root@db03 binlog_server]# mysqlbinlog -R --host=192.168.10.51 --user=mha --password=mha --raw --stop-never mysql-bin.000009 &
3.2.8 重新啟動mha
[root@db03 bin]# nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null> /var/log/mha/app1/manager.log 2>&1 & [root@db03 binlog_server]# masterha_check_status --conf=/etc/mha/app1.cnf app1 (pid:28535) is running(0:PING_OK), master:192.168.10.51