启动mysql服务失败，提示：
[root@localhost ~]# service mysqld restart Redirecting to /bin/systemctl restart mysqld.service mysqld: File './binlog.index' not found (OS errno 13 - Permission denied) 2020-06-22T03:05:07.975321Z 0 [Warning] [MY-010091] [Server] Can't create test file /u01/mysql/data/mysqld_tmp_file_case_insensitive_test.lower-test 2020-06-22T03:05:07.975479Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.19) starting as process 46140 2020-06-22T03:05:07.980755Z 0 [Warning] [MY-010091] [Server] Can't create test file /u01/mysql/data/mysqld_tmp_file_case_insensitive_test.lower-test 2020-06-22T03:05:07.980777Z 0 [Warning] [MY-010159] [Server] Setting lower_case_table_names=2 because file system for /u01/mysql/data/ is case insensitive 2020-06-22T03:05:07.982232Z 0 [ERROR] [MY-010119] [Server] Aborting 2020-06-22T03:05:07.982448Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.19) MySQL Community Server - GPL. Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.
仔细一查，原来是selinux惹的祸：
[root@localhost ~]# /usr/sbin/sestatus SELinux status: enabled SELinuxfs mount: /sys/fs/selinux SELinux root directory: /etc/selinux Loaded policy name: targeted Current mode: enforcing Mode from config file: enforcing Policy MLS status: enabled Policy deny_unknown status: allowed Max kernel policy version: 31 [root@localhost ~]# setenforce 0 [root@localhost ~]# getenforce Permissive
改了就行了，要想永久生效：vi /etc/sysconfig/selinux。
