仔细查看启动命令，发现有Warning: World-writable config file '/etc/my_55_3306.cnf' is ignored的警告
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[root@tomcat02 ~]# /home/mysql_software_55/bin/mysqld_safe --defaults-file=/etc/my_55_3306.cnf &
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[1] 19032
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[root@tomcat02 ~]# Warning: World-writable config file '/etc/my_55_3306.cnf' is ignored
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Warning: World-writable config file '/etc/my_55_3306.cnf' is ignored
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180423 09:18:41 mysqld_safe Logging to '/home/mysql_software_55/data/tomcat02.err'.
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180423 09:18:41 mysqld_safe Starting mysqld daemon with databases from /home/mysql_software_55/data
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# 查看参数文件的权限，发现其他组也具有写权限
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[root@tomcat02 mysql_software_55]# ll /etc/my_55_3306.cnf
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-rw-rw-rw- 1 root root 2252 Apr 23 12:24 /etc/my_55_3306.cnf
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# 解决方法，收回其他组的写权限
- [root@tomcat02 mysql_software_55]# chmod 644 /etc/my_55_3306.cnf