centos7.3 想要安裝mysql5.7
service mysqld restart
redirecting to /bin/systemctl restart mysqld.service
job for mysqld.service failed because the control process exited with error code.
see "systemctl status mysqld.service" and "journalctl -xe"
for details.
systemctl status mysqld.service
結果如下
mysqld.service - mysql server
loaded: loaded (/usr/lib/systemd/system/mysqld.service; disabled; vendor preset: disabled)
active: failed (result: exit-code) since tue 2019-08-06 00:00:53 cst; 4min 32s ago
docs: man:mysqld(8)
process: 18915 execstart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $mysqld_opts
(code=exited, status=1/failure)
process: 18892 execstartpre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/success)
main pid: 18282 (code=exited, status=1/failure)
aug 06 00:00:52 izuf6fx717wv2o5sdh8q9hz systemd[1]: starting mysql server...
aug 06 00:00:52 izuf6fx717wv2o5sdh8q9hz mysqld_pre_systemd[18892]: 2019-08-05t16:00:52.439714z 0 [warning] timestamp with implicit default value is deprecated. please use --ex...details).
aug 06 00:00:52 izuf6fx717wv2o5sdh8q9hz mysqld_pre_systemd[18892]: 2019-08-05t16:00:52.441176z 0 [error] --initialize specified but the data directory has files in it. aborting.
aug 06 00:00:52 izuf6fx717wv2o5sdh8q9hz mysqld_pre_systemd[18892]: 2019-08-05t16:00:52.441194z 0 [error] aborting
aug 06 00:00:53 izuf6fx717wv2o5sdh8q9hz systemd[1]: mysqld.service: control process exited, code=exited status=1
aug 06 00:00:53 izuf6fx717wv2o5sdh8q9hz systemd[1]: failed to start mysql server.
aug 06 00:00:53 izuf6fx717wv2o5sdh8q9hz systemd[1]: unit mysqld.service entered failed state.
aug 06 00:00:53 izuf6fx717wv2o5sdh8q9hz systemd[1]: mysqld.service failed.
hint: some lines were ellipsized, use -l to show in full.
檢視資料檔案，資料檔案存在，被占用
cd /var/lib/mysql
2.備份 mv mysql mysql.bak
3.重啟服務 service mysqld restart
成功！！！
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