● mariadb.service - MariaDB 10.3.14 database server   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)   Active: failed (Result: exit-code) since Wed 2019-05-01 10:43:21 CST; 17s ago     Docs: man:mysqld(8)           https://mariadb.com/kb/en/library/systemd/  Process: 961 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)  Process: 962 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||   VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ]   && systemctl set-environment _WSREP_START_POSITION=$VAR >  Process: 970 ExecStart=/usr/bin/mysqld $MYSQLD_OPTS $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION (code=exited, status=1/FAILURE) Main PID: 970 (code=exited, status=1/FAILURE)   Status: "MariaDB server is down"5月 01 10:43:19 pengArch mysqld[970]: 2019-05-01 10:43:19 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.5月 01 10:43:19 pengArch mysqld[970]: 2019-05-01 10:43:19 0 [Note] InnoDB: Waiting for purge to start5月 01 10:43:19 pengArch mysqld[970]: 2019-05-01 10:43:19 0 [Note] InnoDB: 10.3.14 started; log sequence number 3330072; transaction id 16145月 01 10:43:19 pengArch mysqld[970]: 2019-05-01 10:43:19 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool5月 01 10:43:19 pengArch mysqld[970]: 2019-05-01 10:43:19 0 [Note] Recovering after a crash using tc.log5月 01 10:43:19 pengArch mysqld[970]: 2019-05-01 10:43:19 0 [ERROR] Can't init tc log5月 01 10:43:19 pengArch mysqld[970]: 2019-05-01 10:43:19 0 [ERROR] Aborting5月 01 10:43:21 pengArch systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILURE5月 01 10:43:21 pengArch systemd[1]: mariadb.service: Failed with result 'exit-code'.5月 01 10:43:21 pengArch systemd[1]: Failed to start MariaDB 10.3.14 database server.

删除/var/lib/mysql/ib_logfile*和/var/lib/mysql/tc.log，重新启动，正常。