1.1 报错
[root@b23 mysql]#/etc/init.d/mysql restart
MySQL server PID file could not be found! [FAILED]
Starting MySQL...............................................
解决
[root@b23 mysql]#ps -ef|grep mysql
root 4312 1 0 2016 ? 00:00:00 /bin/sh /disk1/mysql/bin/mysqld_safe --datadir=/disk1/mysql_data/ --pid-file=/disk1/mysql_data//b23.pid
mysql 7083 4312 2 Aug04 ? 03:23:59 /disk1/mysql/bin/mysqld --basedir=/disk1/mysql --datadir=/disk1/mysql_data/ --plugin-dir=/disk1/mysql/lib/plugin --user=mysql --loql_data//b23.err --pid-file=/disk1/mysql_data//b23.pid --socket=/disk1/mysql/mysql.sock --port=3306
root 17697 12436 0 14:56 pts/2 00:00:00 grep --color=auto mysql
如果看到上面的内容，那说明，Mysql的进程卡死了，这时用就要把这些卡死的进程都关闭
[root@b23 mysql]#kill 4312
[root@b23 mysql]#kill 7083
[root@b23 mysql]#/etc/init.d/mysql start
Starting MySQL........................ [ OK ]
[root@b23 mysql]#/etc/init.d/mysql status
MySQL running (18926) [ OK ]
[root@b23 mysql]#ps -ef|grep mysql
[root@b23 ~]#ss -lntup|grep 330*
1.2 报错
[root@b40 ~]# mysql -uroot -p -h 192.168.241.48
Enter password:
ERROR 1129 (HY000): Host '192.168.241.40' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'
解决：
由于mysql数据库的参数：max_connect_errors（系统默认10） mysqld已经得到了大量(max_connect_errors)的主机’hostname’的在中途被中断了的连接请求累计超过10次，就再也无法连接上mysqld服务，同一个ip在短时间内产生太多中断的数据库连接而导致的阻塞（超过mysql数据库max_connection_errors的最大值）
解决方法如下：
1.使用mysqladmin flush-hosts命令清除缓存，命令执行方法如下：
[root@b14 ~]# mysqladmin -uroot -p -h 192.168.241.48 flush-hosts
Enter password:
2.修改mysql配置文件，在[mysqld]下面添加 max_connect_errors=1000，然后重启mysql.
1.3 报错
[root@b43 ~]# /etc/init.d/mysqld status
Warning: World-writable config file '/disk1/mysql/my.cnf' is ignored
SUCCESS! MySQL running (1845)
[root@b43 ~]# ls -ld /disk1/mysql/my.cnf
-rwxrwxrwx. 1 mysql mysql 5641 Jan 24 2016 /disk1/mysql/my.cnf
解决：
[root@b43 mysql]# chmod 644 my.cnf
[root@b43 mysql]# /etc/init.d/mysqld status
SUCCESS! MySQL running (1845)
[root@b43 mysql]#
1.4 报错
解决：
1）从告警信息，首先排除不是mysql问题，应该是外部环境引起的，例如：网络、硬件故障等
2）IO thread每次启动io_thread从主库拉binlog是都有以下逻辑，（handle_slave_io-> get_master_version_and_clock)检查serverid是否重复，时间钟，时区，字符集,设置master heartbeat等. 此错误是在检查serverid时发生网路中断所致。
处理方法：
stop slave; start slave; 即可恢复
1.5 报错 mysql 主从复制代码：1054
查看主从库表结构
解决：
1、stop slave;
2、在从库加上缺失的字段
alter table alert_post add type varchar(255) DEFAULT ' ';
3、start slave;
1.6 报错 代码 1032
错误日志
mysql 1032错误，一般是指要更改的数据不存在，造成同步失败。
解决：
法一：跳过错误
stop salve;
set global sql_slave_skip_counter=1;
start slave;
法二： 跳过所有1032 错误
更改 my.cnf 文件
slave-skip-errors = 1032
重启数据库
start slave;
1.7 报错
查看报错日志
根据报错解决问题
解决：
1.8 mysql从库 报错1032
参考博客：https://www.52os.net/articles/injecting-empty-transactions-repair-mysql-5-6-gtid-replication.html
主库：
mysql> show master statusG
*************************** 1. row ***************************
File: master-bin.000001
Position: 68478641
Binlog_Do_DB: bsppr,coopinion,pm,topic
Binlog_Ignore_DB:
Executed_Gtid_Set: 1f946f67-8c8d-11e6-a75e-5a485dfacc12:1-8783 #主库的事务id是1-8783
1 row in set (0.09 sec)
从库报错：
mysql> show slave statusG
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.241.32
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-bin.000001
Read_Master_Log_Pos: 29686324
Relay_Log_File: b34-relay-bin.000002
Relay_Log_Pos: 26712955
Relay_Master_Log_File: master-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1032
Last_Error: Could not execute Update_rows event on table bsppr.meta_list; Can't find record in 'meta_list', Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND; the event's master log master-bin.000001, end_log_pos 26713356
Skip_Counter: 0
Exec_Master_Log_Pos: 26712743
Relay_Log_Space: 29686738
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 1032
Last_SQL_Error: Could not execute Update_rows event on table bsppr.meta_list; Can't find record in 'meta_list', Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND; the event's master log master-bin.000001, end_log_pos 26713356
Replicate_Ignore_Server_Ids:
Master_Server_Id: 100
Master_UUID: 1f946f67-8c8d-11e6-a75e-5a485dfacc12
Master_Info_File: /disk3/mysql_data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: 180417 23:09:10
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 1f946f67-8c8d-11e6-a75e-5a485dfacc12:1-1899 #记录relay日志从master获取了binlog日志的位置
Executed_Gtid_Set: 1f946f67-8c8d-11e6-a75e-5a485dfacc12:1-1741 #记录本机执行的binlog日志位置,从机上该项中包括主机和从机的binlog日志位置
Auto_Position: 1
1 row in set (0.00 sec)
解决：
mysql> stop slave;
Query OK, 0 rows affected (0.01 sec)
mysql> set global sql_slave_skip_counter=1; #跳过1个事务（使用gtid进行主从复制，如果发生错误，这个办法是不能用的）
ERROR 1858 (HY000): sql_slave_skip_counter can not be set when the server is running with @@GLOBAL.GTID_MODE = ON. Instead, for each transaction that you want to skip, generate an empty transaction with the same GTID as the transaction
mysql> SET GTID_NEXT="1f946f67-8c8d-11e6-a75e-5a485dfacc12:1742"; 第1742事务出现问题，我们插入空事务，跳过该错误。
Query OK, 0 rows affected (0.00 sec)
mysql> BEGIN;COMMIT;
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql> SET GTID_NEXT="AUTOMATIC";
Query OK, 0 rows affected (0.00 sec)
mysql> START SLAVE;
Query OK, 0 rows affected (0.01 sec)
mysql> SHOW SLAVE STATUSG
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.241.32
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-bin.000001
Read_Master_Log_Pos: 115145091
Relay_Log_File: b34-relay-bin.000003
Relay_Log_Pos: 19614608
Relay_Master_Log_File: master-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 54376946
Relay_Log_Space: 115145805
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 858
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 100
Master_UUID: 1f946f67-8c8d-11e6-a75e-5a485dfacc12
Master_Info_File: /disk3/mysql_data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: update
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 1f946f67-8c8d-11e6-a75e-5a485dfacc12:1-14000
Executed_Gtid_Set: 1f946f67-8c8d-11e6-a75e-5a485dfacc12:1-6825
Auto_Position: 1
1 row in set (0.00 sec)
1.9、报错
[root@localhost mysql]# service mysql start
Starting MySQL...[ERROR] The server quit without updating PID file (/disk1/mysql_data/mysqld.pid)
解决：
/disk1/mysql/bin/mysqld_safe --defaults-file=/disk1/mysql/my.cnf