pip3 install feapder -i mirrors.aliyun.com/pypi/simple…
在centos7上安装mariadb-server，在启动过程中遇到如下错误
root@localhost:~# systemctl start mariadb
Job for mariadb.service failed because the control process exited with error code. See "systemctl status mariadb.service" and "journalctl -xe" for details.
root@localhost:~# systemctl status mariadb.service
● mariadb.service - MariaDB database server
Loaded: loaded (/usr/lib/systemd/system/mariadb.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Thu 2022-10-20 15:08:58 CST; 3s ago
Process: 60135 ExecStartPre=/usr/libexec/mariadb-prepare-db-dir %n (code=exited, status=203/EXEC)
Oct 20 15:08:58 localhost.localdomain systemd[1]: Starting MariaDB database server...
Oct 20 15:08:58 localhost.localdomain systemd[60135]: Failed at step EXEC spawning /usr/libexec/mariadb-prepa...nied
Oct 20 15:08:58 localhost.localdomain systemd[1]: mariadb.service: control process exited, code=exited status=203
Oct 20 15:08:58 localhost.localdomain systemd[1]: Failed to start MariaDB database server.
Oct 20 15:08:58 localhost.localdomain systemd[1]: Unit mariadb.service entered failed state.
Oct 20 15:08:58 localhost.localdomain systemd[1]: mariadb.service failed.
Hint: Some lines were ellipsized, use -l to show in full.
root@localhost:~# /usr/libexec/mariadb-prepare-db-dir
Database MariaDB is not initialized, but the directory /var/lib/mysql is not empty, so initialization cannot be done.
Make sure the /var/lib/mysql is empty before running mariadb-prepare-db-dir.
root@localhost:~#
按以上提示，将/var/lib/mysql中的文件移到其它文件夹。
root@localhost:~# mkdir /var/lib/mysql_bk
root@localhost:~# mv /var/lib/mysql/* /var/lib/mysql_bk/
还是不行。通过journalctl -xe里的报错情况来看，可能是
换了一台新虚拟机也是centos7，就好使了。
[root@centos7-126 ~]# ps -ef |grep mariadb
root 5591 3898 0 15:46 pts/0 00:00:00 grep --color=auto mariadb
[root@centos7-126 ~]# ps -ef |grep mysql
root 5598 3898 0 15:46 pts/0 00:00:00 grep --color=auto mysql
[root@centos7-126 ~]# systemctl start mariadb
[root@centos7-126 ~]# ps -ef |grep mariadb
mysql 5874 5708 2 15:46 ? 00:00:00 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --log-error=/var/log/mariadb/mariadb.log --pid-file=/var/run/mariadb/mariadb.pid --socket=/var/lib/mysql/mysql.sock
root 5921 3898 0 15:46 pts/0 00:00:00 grep --color=auto mariadb
[root@centos7-126 ~]# ps -ef |grep mysql
mysql 5708 1 0 15:46 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe --basedir=/usr
mysql 5874 5708 2 15:46 ? 00:00:00 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --log-error=/var/log/mariadb/mariadb.log --pid-file=/var/run/mariadb/mariadb.pid --socket=/var/lib/mysql/mysql.sock
root 5927 3898 0 15:46 pts/0 00:00:00 grep --color=auto mysql