精華總結：MHA構建中的各種報錯與解決

前言

一：報錯與解決

1.1：報錯： [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln364] None of slaves can be master. Check failover configuration file or log-bin settings in my.cnf

• 報錯描述

  [root@mha_manager ~]# masterha_check_repl -conf=/etc/masterha/app1.cnf
  ...省略內容
  Fri Jan 10 08:42:12 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln364] None of slaves can be master. Check failover configuration file or log-bin settings in my.cnf
  Fri Jan 10 08:42:12 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln427] Error happened on checking configurations.  at /usr/local/bin/masterha_check_repl line 48.
  Fri Jan 10 08:42:12 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln525] Error happened on monitoring servers.
  Fri Jan 10 08:42:12 2020 - [info] Got exit code 1 (Not master dead).
  
  MySQL Replication Health is NOT OK!
  

• 原因：

  mysql集羣中的slave節點中數據庫配置文件/etc/my.cnf中沒有配置二進制日誌，只需要在所有slave節點配置二進制日誌即可

  二進制日誌格式
  log-bin=xxx（名稱自定義）
  

• 解決：在所有slave節點配置二進制日誌

  [root@slave1 ~]# vim /etc/my.cnf
      [mysqld]段落添加
  log-bin=slave1-bin	'//添加二進制日誌'
  所以slave節點都要配置，我就不一一展示了
  

1.2：報錯： User myslave does not exist or does not have REPLICATION SLAVE privilege! Other slaves can not start replication from this host.

• 報錯描述

  [root@mha_manager ~]# masterha_check_repl -conf=/etc/masterha/app1.cnf
  ...省略內容
  Fri Jan 10 09:04:53 2020 - [error][/usr/local/share/perl5/MHA/Server.pm, ln398] 192.168.79.135(192.168.79.135:3306): User myslave does not exist or does not have REPLICATION SLAVE privilege! Other slaves can not start replication from this host.
  Fri Jan 10 09:04:53 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln427] Error happened on checking configurations.  at /usr/local/share/perl5/MHA/ServerManager.pm line 1403.
  Fri Jan 10 09:04:53 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln525] Error happened on monitoring servers.
  Fri Jan 10 09:04:53 2020 - [info] Got exit code 1 (Not master dead).
  
  MySQL Replication Health is NOT OK!
  

• 原因：192.168.79.135主機上沒有添加用戶或者權限問題，重新添加用戶和權限即可

• 解決：

  添加用戶
  '//192.168.79.0段的從服務器擁有複製權限，可以使用myslave身份123456密碼複製所有的庫和表'
  mysql> GRANT REPLICATION SLAVE ON *.* TO 'myslave'@'192.168.79.%' IDENTIFIED BY '123456';
  Query OK, 0 rows affected, 1 warning (0.01 sec)
  '//查看創建的用戶，若出現兩個用戶，也會報錯，刪除一個即可'
  mysql> SELECT Repl_slave_priv AS Value FROM mysql.user WHERE user = 'myslave';
  +-------+
  | Value |
  +-------+
  | Y     |
  +-------+
  1 row in set (0.00 sec)
  

1.3：報錯：[/usr/local/share/perl5/MHA/MasterMonitor.pm, ln208] Slaves settings check failed!

• 報錯描述：

  [root@mha_manager ~]# masterha_check_repl -conf=/etc/masterha/app1.cnf
  Can't exec "mysqlbinlog": 沒有那個文件或目錄 at /usr/local/share/perl5/MHA/BinlogManager.pm line 106.
  mysqlbinlog version command failed with rc 1:0, please verify PATH, LD_LIBRARY_PATH, and client options
   at /usr/local/bin/apply_diff_relay_logs line 493.
  Fri Jan 10 11:01:35 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln208] Slaves settings check failed!
  Fri Jan 10 11:01:35 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln416] Slave configuration failed.
  Fri Jan 10 11:01:35 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln427] Error happened on checking configurations.  at /usr/local/bin/masterha_check_repl line 48.
  Fri Jan 10 11:01:35 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln525] Error happened on monitoring servers.
  Fri Jan 10 11:01:35 2020 - [info] Got exit code 1 (Not master dead).
  
  MySQL Replication Health is NOT OK!
  
  

• 原因：Can’t exec “mysqlbinlog”: 沒有那個文件或目錄 at /usr/local/share/perl5/MHA/BinlogManager.pm line 106.

• 解決：

  所有節點創建軟連接
  ln -s /usr/local/mysql/bin/mysqlbinlog /usr/local/bin/
  

1.4：報錯：[error]/usr/local/share/perl5/MHA/MasterMonitor.pm, ln208 Slaves settings check failed!

• 報錯描述：

  [root@mha_manager bin]# masterha_check_repl -conf=/etc/masterha/app1.cnf
  mysqlbinlog: [ERROR] unknown variable 'default-character-set=utf8'
  mysqlbinlog version command failed with rc 7:0, please verify PATH, LD_LIBRARY_PATH, and client options
   at /usr/local/bin/apply_diff_relay_logs line 493.
  Fri Jan 10 11:03:09 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln208] Slaves settings check failed!
  Fri Jan 10 11:03:09 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln416] Slave configuration failed.
  Fri Jan 10 11:03:09 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln427] Error happened on checking configurations.  at /usr/local/bin/masterha_check_repl line 48.
  Fri Jan 10 11:03:09 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln525] Error happened on monitoring servers.
  Fri Jan 10 11:03:09 2020 - [info] Got exit code 1 (Not master dead).
  
  MySQL Replication Health is NOT OK!
  
  

• 原因：mysqlbinlog: [ERROR] unknown variable ‘default-character-set=utf8’

• 解決：從服務器上都註釋掉client段的默認字符集

  [root@slave1 ~]# vim /etc/my.cnf
  [client]
  #default-character-set=utf8	'//註釋掉此'
  

1.5：報錯：Testing mysql connection and privileges…sh: mysql: 未找到命令

• 報錯描述：

  Fri Jan 10 11:20:21 2020 - [info]   Connecting to [email protected](192.168.79.135:22).. 
    Checking slave recovery environment settings..
      Opening /usr/local/mysql/data/relay-log.info ... ok.
      Relay log found at /usr/local/mysql/data, up to relay-log-bin.000043
      Temporary relay log file is /usr/local/mysql/data/relay-log-bin.000043
      Testing mysql connection and privileges..sh: mysql: 未找到命令
  mysql command failed with rc 127:0!
   at /usr/local/bin/apply_diff_relay_logs line 375.
          main::check() called at /usr/local/bin/apply_diff_relay_logs line 497
          eval {...} called at /usr/local/bin/apply_diff_relay_logs line 475
          main::main() called at /usr/local/bin/apply_diff_relay_logs line 120
  Fri Jan 10 11:20:21 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln208] Slaves settings check failed!
  Fri Jan 10 11:20:21 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln416] Slave configuration failed.
  Fri Jan 10 11:20:21 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln427] Error happened on checking configurations.  at /usr/local/bin/masterha_check_repl line 48.
  Fri Jan 10 11:20:21 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln525] Error happened on monitoring servers.
  Fri Jan 10 11:20:21 2020 - [info] Got exit code 1 (Not master dead).
  
  MySQL Replication Health is NOT OK!
  
  

• 原因：沒有mysql命令

  Testing mysql connection and privileges..sh: mysql: 未找到命令
  mysql command failed with rc 127:0!
  

• 解決：創建mysql軟連接

  ln -s /usr/local/mysql/bin/mysql /usr/local/bin/
  

1.6：報錯：Failed to get master_ip_failover_script status with return code 2:0.

• 報錯描述：

  /usr/local/bin/master_ip_failover:行2: use: 未找到命令
  /usr/local/bin/master_ip_failover:行3: use: 未找到命令
  /usr/local/bin/master_ip_failover:行5: use: 未找到命令
  /usr/local/bin/master_ip_failover:行7: 未預期的符號 `newline' 附近有語法錯誤
  /usr/local/bin/master_ip_failover:行7: ` my ('
  Fri Jan 10 11:58:44 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln229]  Failed to get master_ip_failover_script status with return code 2:0.
  Fri Jan 10 11:58:44 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln427] Error happened on checking configurations.  at /usr/local/bin/masterha_check_repl line 48.
  Fri Jan 10 11:58:44 2020 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln525] Error happened on monitoring servers.
  Fri Jan 10 11:58:44 2020 - [info] Got exit code 1 (Not master dead).
  
  MySQL Replication Health is NOT OK!
  

• 原因：master_ip_failover 文件語法問題

• 解決：#!/usr/bin/env perl頂格寫就行

  [root@mha_manager bin]# vim master_ip_failover
  #!/usr/bin/env perl	'//第一行要最頂行寫，不要有空格'