问题
I've just updated MariaDB using apt-get dist-upgrade. Now it won't start using service mysql start anymore.
I can however, run it as root or do: sudo -u mysql mysqld_safe then MariaDB starts up fine. The folder /home/mysql is owned by the mysql user and group.
I've found the error to be thrown in this function: https://github.com/MariaDB/server/blob/7ff44b1a832b005264994cbdfc52f93f69b92cdc/sql/mysqld.cc#L9865
I can't figure out what to do next. Any pointers?
回答1:
To run MariaDB SQL from /home, in the file /usr/lib/systemd/system/mariadb.service, just change :
ProtectHome=true
to :
ProtectHome=false
回答2:
Same situation after update on Debian 8 (Jessie) and 9 (Stretch). After "apt-get upgrade" the command
- service mysql start
the server fails to start and logs error:
[Warning] Can't create test file /home/johndoe/UserDatabases/mypcname.lower-test
the solution is to change in file /lib/systemd/system/mariadb.service the value:
ProtectHome=true
to
ProtectHome=false
as described above.
回答3:
On debian 9 you need to change ProtectHome to false in both /lib/systemd/system/mariadb.service and /lib/systemd/system/mariadb@.service then run sudo systemctl daemon-reload.
Maybe also run sudo grep -Ri "protecthome" /lib/systemd/system to find other instances of ProtectHome in mysql-related files if this still isn't working
回答4:
@RedGiant yes I solved it. Forgot to post here.
Apparently after the .1 release you cannot run SQL from /home anymore. There's probably a way around this but haven't found it.
I can run MySQL from any location except /home. What I did was unmount /home (I had my SSD RAID mounted to /home) and re-mount my disk as /ssd. Changed my paths in the config and it worked right away.
I did not run SELinux or Apparmor.
回答5:
The workaround for this is mounting the directory in home as /var/lib/mysql:
mount --bind /home/mysql/var/lib/mysql /var/lib/mysql
回答6:
The answer by Thomas is correct, but get's reset by updates every few months. So here is a permanent solution:
Use systemctl edit mariadb to create a file overwritting the default settings of the mariadb service. (In debian it's located in /etc/systemd/system/mariadb.service.d/override.conf)
Set the same setting Thomas changed in the file:
[Service]
ProtectHome=false
Use systemctl daemon-reload to reload the systemctl config.
来源：https://stackoverflow.com/questions/38529205/mariadb-cannot-start-after-update-warning-cant-create-test-file-home-mysql