mysql如何開啟各種日志

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以下日志開啟均在mysql5.7.32進行測試

general_log

general_log支持熱開啟，熱關閉。開啟general_log會記錄所有操作mysql命令，所以會產生大量文件，一般不開啟。

相關參數general_log、log_output、general_log_file

mysql> show variables like 'general_log';  --查看日志是否開啟
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| general_log   | OFF   |
+---------------+-------+
1 row in set (1.09 sec)

mysql> show variables like 'general_log_file'; --general_log_file日志保存位置
+------------------+--------------------------------------+
| Variable_name    | Value                                |
+------------------+--------------------------------------+
| general_log_file | /opt/sudytech/mysql/data/general.log |
+------------------+--------------------------------------+
1 row in set (2.41 sec)

mysql> show variables like 'log_output'; --日志輸出類型 table和file兩種類型
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_output    | FILE  |
+---------------+-------+
1 row in set (0.00 sec)

log_output='FILE' 表示將日志存入文件,默認值是FILE　 
log_output='TABLE'表示將日志存入數據庫,這樣日志信息就會被寫入到mysql.slow_log表中.
mysql數據庫支持同時兩種日志存儲方式,配置的時候以逗號隔開即可,如:log_output='FILE,TABLE'.
日志記錄到系統專用日志表中,要比記錄到文件耗費更多的系統資源,因此對於需要啟用慢查日志,又需要比夠獲得更高的系統性能,那麼建議優先記錄到文件。
開啟general_log日志
mysql> set global general_log=on; --開啟日志
Query OK, 0 rows affected (2.60 sec)

mysql> show variables like 'general_log';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| general_log   | ON    |
+---------------+-------+
1 row in set (0.00 sec)

mysql> set global general_log_file='/opt/sudytech/mysql/data/general.log'; --指定日志產生位置
Query OK, 0 rows affected (0.05 sec)

mysql> show variables like 'general_log_file';
+------------------+--------------------------------------+
| Variable_name    | Value                                |
+------------------+--------------------------------------+
| general_log_file | /opt/sudytech/mysql/data/general.log |
+------------------+--------------------------------------+
1 row in set (0.04 sec)

由於log_output默認值為FILE。所以不需要修改。

查看/opt/sudytech/mysql/data/目錄下已經產生瞭general.log日志

[root@localhost data]# pwd
/opt/sudytech/mysql/data
[root@localhost data]# tail -f general.log 
2021-05-18T06:45:32.140829Z         2 Query     set global general_log=OFF
/opt/sudytech/mysql/bin/mysqld, Version: 5.7.32-log (MySQL Community Server (GPL)). started with:
Tcp port: 3306  Unix socket: /tmp/mysql.sock
Time                 Id Command    Argument
2021-05-18T10:43:17.049473Z         3 Query     show variables like 'general_log'
2021-05-18T10:44:09.060990Z         3 Query     set global general_log_file='/opt/sudytech/mysql/data/general.log'
/opt/sudytech/mysql/bin/mysqld, Version: 5.7.32-log (MySQL Community Server (GPL)). started with:
Tcp port: 3306  Unix socket: /tmp/mysql.sock
Time                 Id Command    Argument
2021-05-18T10:44:18.375549Z         3 Query     show variables like 'general_log_file'
......

永久修改需要在my.cnf中[mysqld]添加
general_log = 1
general_log_file=/opt/sudytech/mysql/data/general.log

log_bin

log_bin不支持熱開啟。
mysql> set global log_bin=on;
ERROR 1238 (HY000): Variable 'log_bin' is a read only variable

需要在my.cnf [mysqld]中添加
log_bin=/opt/sudytech/mysql/data/mysql-bin
expire_logs_days = 180    #日志過期天數
max_binlog_size = 500M  #單日文件最大大小

開啟後會在/opt/sudytech/mysql/data目錄下產生mysql-bin.xxxxx和mysql-bin.index兩個文件。mysql-bin.xxxxxx是記錄binlog日志的文件，而index是存放mysql-bin文件名的文件
[root@localhost data]# ll mysql-bin.*
-rw-r-----. 1 mysql mysql 372 5月  18 18:58 mysql-bin.000001
-rw-r-----. 1 mysql mysql 154 5月  18 18:58 mysql-bin.000002
-rw-r-----. 1 mysql mysql  84 5月  18 18:58 mysql-bin.index
[root@localhost data]# cat mysql-bin.index 
/opt/sudytech/mysql/data/mysql-bin.000001
/opt/sudytech/mysql/data/mysql-bin.000002

遇到以下3種情況時，MySQL會重新生成一個新的日志文件，文件序號遞增

  • 1、MySQL服務器停止或重啟時（其實重啟時也是調用flush logs命令）
  • 2、使用 flush logs 命令；
  • 3、當 binlog 文件大小超過 max_binlog_size 變量的值時；

max_binlog_size 的最小值是4096字節，最大值和默認值是 1GB (1073741824字節)。事務被寫入到binlog的一個塊中，所以它不會在幾個二進制日志之間被拆分。因此，如果你有很大的事務，為瞭保證事務的完整性，不可能做切換日志的動作，隻能將該事務的日志都記錄到當前日志文件中，直到事務結束，你可能會看到binlog文件大於 max_binlog_size 的情況。

查看mysql-bin.xxxxx信息，mysql-bin.xxxxx是以二進制形式存儲，vim、cat查看是亂碼，這時可以使用mysqlbinlog命令查看

[root@localhost data]# /opt/sudytech/mysql/bin/mysqlbinlog  -v --base64-output=decode-rows  --start-datetime='2021-04-11 00:00:00' --stop-datetime='2021-05-19 15:00:00' /opt/sudytech/mysql/data/mysql-bin.000002
 base64-output，可以控制輸出語句輸出base64編碼的BINLOG語句;decode-rows：選項將把基於行的事件解碼成一個SQL語句
..............
create database aaaaa
/*!*/;
# at 316
#210518 19:15:01 server id 1  end_log_pos 381 CRC32 0x6f4cdc6c  Anonymous_GTID  last_committed=1        sequence_number=2       .......
create database bbbb
.....

audit_log（mysql_audit.json）

開啟audit_log需要安裝審計插件，將audit-plugin-mysql-5.7-1.1.4-725-linux-x86_64.zip文件上傳到/opt下解壓，登錄數據庫查看插件存放位置

mysql> show global variables like 'plugin_dir';
+---------------+----------------------------------+
| Variable_name | Value                            |
+---------------+----------------------------------+
| plugin_dir    | /opt/sudytech/mysql//lib/plugin/ |
+---------------+----------------------------------+
1 row in set (0.02 sec)

將插件復制該路徑下，並授權

[root@localhost mysql]# cp /opt/sudytech/audit-plugin-mysql-5.7-1.1.4-725/lib/libaudit_plugin.so  /opt/sudytech/mysql//lib/plugin/
[root@localhost mysql]# chmod +x /opt/sudytech/mysql//lib/plugin/libaudit_plugin.so
[root@localhost mysql]# chown mysql:mysql /opt/sudytech/mysql//lib/plugin/libaudit_plugin.so

登錄數據庫進行安裝

mysql> install plugin audit soname 'libaudit_plugin.so';
ERROR 1123 (HY000): Can't initialize function 'audit'; Plugin initialization function failed.

解決方法：

[root@localhost mysql]# /opt/sudytech/audit-plugin-mysql-5.7-1.1.4-725/utils/offset-extract.sh /opt/sudytech/mysql/bin/mysqld
ERROR: gdb not found. Make sure gdb is installed and on the path.

[root@localhost mysql]# yum -y instal gdb

[root@localhost mysql]# /opt/sudytech/audit-plugin-mysql-5.7-1.1.4-725/utils/offset-extract.sh /opt/sudytech/mysql/bin/mysqld
//offsets for: /opt/sudytech/mysql/bin/mysqld (5.7.32)
{"5.7.32","30165bbd00a2077d2e4b1d3c6768c2f7", 7824, 7872, 3632, 4792, 456, 360, 0, 32, 64, 160, 536, 7988, 4360, 3648, 3656, 3660, 6072, 2072, 8, 7056, 7096, 7080},

編輯my.cnf在[mysql]中添加,重啟mysql

audit_json_file=on #保證mysql重啟後自動啟動插件
audit_record_cmds='insert,delete,update,create,drop,alter,grant,truncate,show'  #記錄操作     
plugin-load=AUDIT=libaudit_plugin.so   #防止刪除瞭插件，重啟後又會加載
audit_json_log_file=/opt/sudytech/mysql/stat/logs/mysql_audit.json  #日志路徑
audit_offsets=7824, 7872, 3632, 4792, 456, 360, 0, 32, 64, 160, 536, 7988, 4360, 3648, 3656, 3660, 6072, 2072, 8, 7056, 7096, 7080

查看/opt/sudytech/mysql/stat/logs/目錄下會產生mysql_audit.json日志

[root@localhost logs]# cat mysql_audit.json  
..........
{"msg-type":"activity","date":"1621349743813","thread-id":"2","query-id":"6","user":"root","priv_user":"root","ip":"","host":"localhost","connect_attrs":{"_os":"linux-glibc2.12","_client_name":"libmysql","_pid":"8826","_client_version":"5.7.32","_platform":"x86_64","program_name":"mysql"},"pid":"8826","os_user":"root","appname":"/opt/sudytech/mysql/bin/mysql","cmd":"create_db","query":"create database  bbbbb"}
{"msg-type":"activity","date":"1621349802594","thread-id":"2","query-id":"8","user":"root","priv_user":"root","ip":"","host":"localhost","connect_attrs":{"_os":"linux-glibc2.12","_client_name":"libmysql","_pid":"8826","_client_version":"5.7.32","_platform":"x86_64","program_name":"mysql"},"pid":"8826","os_user":"root","appname":"/opt/sudytech/mysql/bin/mysql","cmd":"drop_db","query":"drop database bbbbb"}

audit_log（server_audit.log）

server_audit.log支持熱開啟，熱關閉。下載mariadb-5.5.68壓縮包，解壓獲取mariadb-5.5.68-linux-x86_64/lib/plugin/server_audit.so(mysql8後不支持該插件)

MariaDB_5.x.x和MariaDB_10.x.x區別：

  • MariaDB_5.x.x：兼容MySQL5.x.x的，接口幾乎一致，隻限於社區版
  • MariaDB_10.x.x：10.x.x使用新技術，接口會與MySQL逐漸區別開來,向MariaDB新接口過渡

因為測試數據庫版本為5.7.32,所以選擇mariadb-5.5.68

登錄數據庫查看插件存放位置

mysql> show global variables like 'plugin_dir';
+---------------+----------------------------------+
| Variable_name | Value                            |
+---------------+----------------------------------+
| plugin_dir    | /opt/sudytech/mysql//lib/plugin/ |
+---------------+----------------------------------+
1 row in set (0.02 sec)

將插件復制該路徑下，並授權

[root@localhost plugin]# cp /opt/sudytech/mariadb-5.5.68-linux-x86_64/lib/plugin/server_audit.so  /opt/sudytech/mysql/lib/plugin/
[root@localhost plugin]# chmod +x /opt/sudytech/mysql/lib/plugin/server_audit.so

登錄數據庫進行安裝

mysql> install plugin server_audit soname 'server_audit.so';
Query OK, 0 rows affected (0.00 sec)

mysql> show plugins;
+----------------------------+----------+--------------------+-----------------+---------+
| Name                       | Status   | Type               | Library         | License |
+----------------------------+----------+--------------------+-----------------+---------+
| binlog                     | ACTIVE   | STORAGE ENGINE     | NULL            | GPL     |
.......
| SERVER_AUDIT               | ACTIVE   | AUDIT              | server_audit.so | GPL     |
+----------------------------+----------+--------------------+-----------------+---------+

開啟server_audit.log，日志默認會在mysql/data目錄下,可通過server_audit_file_path指定文件存放位置

mysql> show variables like '%server_audit_logging%'; 
+----------------------+-------+
| Variable_name        | Value |
+----------------------+-------+
| server_audit_logging | OFF   |
+----------------------+-------+
1 row in set (0.00 sec)

mysql> set  global  server_audit_logging=on;
Query OK, 0 rows affected (0.00 sec)

在my.cnf中[mysqld]添加配置

server_audit_logging = ON #開啟日志記錄，默認是關閉
server_audit = FORCE_PLUS_PERMANENT #防止插件被卸載
server_audit_file_path = /opt/sudytech/mysql/stat/logs/server_audit.log #定義審計日志路徑與文件名
server_audit_file_rotations = 2 #定義審計日志的輪詢個數，0為不輪詢，值為2會產生3個文件server_audit.log server_audit.log.1 server_audit.log.2
server_audit_file_rotate_size = 1073741824 #定義切割審計日志的文件大小1073741824=1GB,當server_audit_file_rotations為0時，設置該值無意義

在/opt/sudytech/mysql/stat/logs目錄下就會產生server_audit.log日志

[root@localhost logs]# tail -f server_audit.log
20210519 10:05:00,localhost.localdomain,root,localhost,2,27,QUERY,,'show variables like \'server_audit_file_rotations\'',0
20210519 10:05:01,localhost.localdomain,root,localhost,2,28,QUERY,,'show variables like \'server_audit_file_rotations\'',0
20210519 10:05:01,localhost.localdomain,root,localhost,2,29,QUERY,,'show variables like \'server_audit_file_rotations\'',0
20210519 10:05:01,localhost.localdomain,root,localhost,2,30,QUERY,,'show variables like \'server_audit_file_rotations\'',0
20210519 10:05:02,localhost.localdomain,root,localhost,2,31,QUERY,,'show variables like \'server_audit_file_rotations\'',0
20210519 10:35:02,localhost.localdomain,root,localhost,2,0,DISCONNECT,,,0

server_audit.log參數說明：

  • server_audit_output_type  指定日志輸出類型，可為SYSLOG或FILE，為SYSLOG時，記錄在/var/log/message中
  • server_audit_logging  啟動或關閉審計
  • server_audit_events  指定記錄事件的類型，可以用逗號分隔的多個值(connect,query,table)，如果開啟瞭查詢緩存(query cache)，查詢直接從查詢緩存返回數據，將沒有table記錄
  • server_audit_file_path  如server_audit_output_type為FILE，使用該變量設置存儲日志的文件，可以指定目錄，默認存放在mysql/data目錄的server_audit.log文件中
  • server_audit_file_rotations  指定日志文件的數量，如果為0日志將從不輪轉
  • server_audit_file_rotate_size  限制日志文件的大小,當server_audit_file_rotations為0時，該值無意義
  • server_audit_file_rotate_now  是否立即切割日志，當server_audit_file_rotations為0時，該值無意義
  • server_audit_incl_users  指定哪些用戶的活動將記錄，connect將不受此變量影響，該變量比server_audit_excl_users優先級高
  • server_audit_syslog_facility  默認為LOG_USER，指定facility
  • server_audit_syslog_ident  設置ident，作為每個syslog記錄的一部分
  • server_audit_syslog_info  指定的info字符串將添加到syslog記錄
  • server_audit_syslog_priority  定義記錄日志的syslogd priority
  • server_audit_excl_users  該列表的用戶行為將不記錄，connect將不受該設置影響

以上為個人經驗，希望能給大傢一個參考，也希望大傢多多支持WalkonNet。

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