https://blog.csdn.net/leshami/article/details/78952842

https://blog.csdn.net/hyy_217/article/details/72781614

https://blog.csdn.net/jason_asia/article/details/100749127???? (這個可以)

在MySQL 5.7版本中，日志記錄時間發生了變化，使用了UTC方式來記錄日志時間，也就是說這是個世界統一時間，與我們常用的本地時間不協調，因此，初始化MySQL 5.7之后，需要對此做出調整，如下本文的描述。

一、錯誤日志的時間格式

當前環境

[robin@ydq-mnt ~]$ more /etc/redhat-release

CentOS Linux release 7.4.1708 (Core)

[robin@ydq-mnt ~]$ mysql -V

mysql Ver 14.14 Distrib 5.7.19-17, for Linux (x86_64) using 6.2

[root@ydq-mnt ~]# date ###系統時間

Mon Dec 18 14:23:16 CST 2018

[root@ydq-mnt ~]# more /var/log/mysqld.log ###mysql 日志輸出信息

2017-12-18T07:50:40.575098Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated.

Please use --explicit_defaults_for_timestamp server option (see do

cumentation for more details).

2017-12-18T07:50:40.576375Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.19-17-57-log) starting as process 9268 ...

2017-12-18T07:50:40.578287Z 0 [Warning] No argument was provided to --log-bin, and --log-bin-index was not used;

so replication may break when this MySQL serve

r acts as a master and has his hostname changed!! Please use '--log-bin=ydq-mnt-bin' to avoid this problem.

2017-12-18T07:50:40.578320Z 0 [Note] WSREP: Setting wsrep_ready to false

2017-12-18T07:50:40.578330Z 0 [Note] WSREP: No pre-stored wsrep-start position found. Skipping position initialization.

2017-12-18T07:50:40.578335Z 0 [Note] WSREP: wsrep_load(): loading provider library '/usr/lib64/galera3/libgalera_smm.so'

2017-12-18T07:50:40.582014Z 0 [Note] WSREP: wsrep_load(): Galera 3.22(r8678538) by Codership Oy

loaded successfully.

從上所示，當前的系統時間為mysql日志記錄的時間不一致。

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二、系統變量log_timestamps

This variable controls the timestamp time zone of error log messages, and of general query log

and slow query log messages written to files. It does not affect the time zone of general query log

and slow query log messages written to tables (mysql.general_log, mysql.slow_log). Rows

retrieved from those tables can be converted from the local system time zone to any desired time

zone with CONVERT_TZ() or by setting the session time_zone system variable.

Permitted log_timestamps values are UTC (the default) and SYSTEM (local system time zone).

Timestamps are written using ISO 8601 / RFC 3339 format: YYYY-MM-DDThh:mm:ss.uuuuuu plus

a tail value of Z signifying Zulu time (UTC) or hh:mm (an offset from UTC).

This variable was added in MySQL 5.7.2. Before 5.7.2, timestamps in log messages were written

using the local system time zone by default, not UTC. If you want the previous log message time

zone default, set log_timestamps=SYSTEM.

從上描述可知，這個變量是在MySQL 5.7.2中添加的。缺省值為UTC。

如果如要使用缺省時區的時間，修改該參數的值為SYSTEM

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三、修改及驗證

mysql> set global log_timestamps='SYSTEM';

Query OK, 0 rows affected (0.00 sec)

[root@ydq-mnt mysql]# vim /etc/percona-xtradb-cluster.conf.d/mysqld.cnf

log_timestamps=SYSTEM

[root@ydq-mnt ~]# systemctl restart mysql

2017-12-18T07:52:41.543983Z 0 [Note] Beginning of list of non-natively partitioned tables

2017-12-18T07:52:41.544128Z 0 [Note] WSREP: Member 0.0 (ydq-mnt) synced with group.

2017-12-18T07:52:41.544138Z 0 [Note] WSREP: Shifting JOINED -> SYNCED (TO: 4163)

2017-12-18T07:52:41.550738Z 8 [Note] WSREP: Synchronized with group, ready for connections

2017-12-18T07:52:41.550755Z 8 [Note] WSREP: This node is synced, setting wsrep_ready to true

2017-12-18T07:52:41.550761Z 8 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.

2017-12-18T07:52:41.582207Z 0 [Note] End of list of non-natively partitioned tables

2017-12-18T07:52:43.178826Z 0 [Note] InnoDB: Buffer pool(s) load completed at 171218 15:52:43

2017-12-18T16:24:23.588881+08:00 0 [Note] WSREP: Received shutdown signal. Will sleep for 10 secs before initiating shutdown.

pxc_maint_mode switched to SHUTDOWN

2017-12-18T16:24:33.591354+08:00 0 [Note] WSREP: Stop replication

2017-12-18T16:24:33.591408+08:00 0 [Note] WSREP: Closing send monitor...

2017-12-18T16:24:33.591429+08:00 0 [Note] WSREP: Closed send monitor.

2017-12-18T16:24:33.591453+08:00 0 [Note] WSREP: gcomm: terminating thread

2017-12-18T16:24:33.591477+08:00 0 [Note] WSREP: gcomm: joining thread

2017-12-18T16:24:33.591700+08:00 0 [Note] WSREP: gcomm: closing backend

再次啟動及驗證，時間顯示與系統時間一致。

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總結

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