Bug on installation


First, thank you for your hard work in making mysql working better with Debian, I am new to Percona mysql server, but I like it.
One annoyance, though.
I have a machine with a dedicated partition for MySQL, mounted on /var/lib/mysql/
When I install perconna, manually, it complains that the directory exists, even if it is empty (except maybe lost+found)
When I try the installation using my Ansible provisioning script, it completely fails, waiting for an answer, even if ansible is set up to non-interactive.

-bash: /var/lib/mysql/.bash_profile: Permission denied
mysqld: Can't create directory '/var/lib/mysql/' (Errcode: 17 - File exists)
2019-12-02T15:07:39.022204Z 0 [Warning] 'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They will be merged with strict mode in a future release.
2019-12-02T15:07:39.022232Z 0 [Warning] 'NO_AUTO_CREATE_USER' sql mode was not set.
2019-12-02T15:07:39.024186Z 0 [ERROR] Aborting

I am very close to finish this task, thank you for your time, and again, for your hard work!

Can I just check in with you on what version you’re installing please?

Hello Lorraine, thanks for the answer! the latest version, on Debian Buster, i.e. 5.7

I think I found the exact issue:

Since I use a partition for /var/lib/mysql, the directory already exists, is mounted and belongs to root. The permissions are ‘0755’
The installer place the files in this folder, but the daemon fail to start, with a cryptic error message:

mysqld[19638]: Unable to determine if daemon is running: No such file or directory

If I manually set the permissions to 0777, they are changed to 0755 by the installation script. Good, but the owner is not checked by the installation script.

However, if I change the directory permissions after the installation, and then restart the service manually, it works like a charm.

Therefore, IMHO, this is what should happen in the pre-installation script: Once the mysql user is created, the owner of the folder should be set to mysql:mysql before trying to start the server.

The way I have found to solve the problem, is to “guess” the uid/gid of the mysql user that will be created, and then, start the installation.

This is not practical, though.

Thanks again for your patience!


Helo, Lorraine,

In fact, this is worse than I expected. My script works as expected, i.e. set the owner to mysql/mysql before the installation of percona package. But then, in the middle of the installation, the folder permissions are set again to root:root !

I hope this will be helpful

Thank you for the update, I’ll see if I can find someone to help with this.