When using our -systemd- binary tarballs the distributed mysqld.service systemd service file has
ProtectSystem=full
set since MDEV-10298. As this leads to everything under /usr being read-only, but the binary tarball builds having the data dir set up under /usr/local/mariadb-.../data by default.
So trying to bring the MariaDB server up using default settings, according to our instructions in
2021-08-06 10:44:49 0 [ERROR] mysqld: File '/usr/local/mariadb-10.4.18-linux-systemd-x86_64/data/aria_log_control' not found (Errcode: 30 "Read-only file system")
while starting the server manually works just fine.
So I'd suggest to add
ReadWritePaths=/usr/local/mysql/data
to the bundled mariadb.service file. As /usr/local/mysql/data is a symlink, and SystemD resolves this link to the actual data directory, this should work across all releases without requiring per-release adjustments.
A more complete fix would be to allow both the symlink and the actual versioned path, like e.g.:
Just by coincidence I ran into the same yesterday (didn't even really remember I had encountered it before, and especially not that I created this ticked), and for now updated the KB entries on tarball installation and on systemD to mention this problem and how to deal with it with a simple extra systemd service include file:
Hartmut Holzgraefe
added a comment - Just by coincidence I ran into the same yesterday (didn't even really remember I had encountered it before, and especially not that I created this ticked), and for now updated the KB entries on tarball installation and on systemD to mention this problem and how to deal with it with a simple extra systemd service include file:
https://mariadb.com/kb/en/installing-mariadb-binary-tarballs/#auto-start-of-mysqld
https://mariadb.com/kb/en/systemd/#configuring-the-data-directory
People
Daniel Black
Hartmut Holzgraefe
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MDEV-10298 Improve systemd service hardening
cvicentiu I tried but it just said that it doesn't fit in to regex..