Date: Thu, 10 Oct 2019 15:42:57 +0100 From: "Luis P. Mendes" <luislupe@gmx.com> To: freebsd-questions@freebsd.org Subject: mysql socket disappears when restarting related jail with nullfs mount point Message-ID: <20191010144257.GA14181@leao.home>
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I'm running FreeBSD 11.3-RELEASE-p3 on a VPS.
The jail manager is qjail, version 5.4.
The server has two jails: a database `mariadb` and a web `webjail`.
Access to the database is done only through a unix socket to be null
mounted at the latter jail.
When started, 'service mysql-server start' on the `mariadb` jail
places the socket at /var/run/mysql/mysql.sock
When started, the `webjail` should mount that socket in its own
/var/run/mysql directory.
This is the line of the corresponding
/usr/local/etc/qjail.fstab/webjail file:
/usr/jails/mariadb/var/run/mysql /usr/jails/webjail/var/run/mysql
nullfs rw 0 0
What happens is that everytime that the `webjail` is started (the
first time or when restarted), the socket at `mariadb`'s
/var/run/mysql/mysql.sock
is deleted somehow.
Although this happens, the mysqld_safe and mysqld daemons keep
running.
As a note, when `webjail` is stopped, nothing happens to the socket at
the jail of the mariadb database server.
If the `mariadb` jail is started after `webjail`, the socket is
correctly mounted at the latter /var/run/mysql directory.
Using qjail's archive and restore commands, I copied these two jails
to another FreeBSD 11.3-RELEASE virtual machine, at my own computer,
and the strange behavior still happens.
There are no rc.d scripts made by me.
The contents of the config file for the `webjail` are:
/usr/local/etc/qjail.config/webjail
webjail { host.hostname =3D "webjail";
path =3D "/usr/jails/webjail";
mount.fstab =3D "/usr/local/etc/qjail.fstab/webjail";
exec.consolelog =3D "/var/log/qjail.webjail.console.log";
mount.devfs;
ip4.addr =3D 127.0.0.85;
interface =3D "lo1";
devfs_ruleset =3D "4";
exec.start =3D "/bin/sh /etc/rc";
exec.stop =3D "/bin/sh /etc/rc.shutdown";
What's wrong with this?
Why starting a jail deletes a socket in another jail?
=2D-
Lu=C3=ADs Mendes
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