Jailkit and MYSQL - mysqld.sock can't be linked to tmpfs /run

Hello!
Some of my clients need access to mysql, php, composer from chrooted shell accounts. I made the necessary changes and everything is working fine except MYSQL.
I found this error in the ISPConfig log:

Code:

ln: creating hard link '/var/www/clients/client15/web2/var/run/mysqld/mysqld.sock' => '/var/run/mysqld/mysqld.sock': Invalid cross-device link

In /usr/local/ispconfig/server/scripts/create_jailkit_chroot.sh ISPConfig try to create this link, but you can't make hard link from two different partitions.
In debian/ubuntu (and many more) by default the /run (/var/run) is a tmpfs mounted partition!
I can mount /var/run/mysqld in /var/www/clients/client15/web2/var/run/mysqld/ but after reboot setting will lost!
Please, how can I solve this problem?
df -h output:

Code:

/dev/md2        1.8T   17G  1.7T   1% /
udev             10M     0   10M   0% /dev
tmpfs           3.2G  197M  3.0G   7% /run
tmpfs           7.9G     0  7.9G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           7.9G     0  7.9G   0% /sys/fs/cgroup
/dev/md0        180M   33M  135M  20% /boot

mount output:

Code:

-------------
tmpfs on /run type tmpfs (rw,nosuid,relatime,size=3285232k,mode=755)
/dev/md2 on / type ext4 (rw,noatime,nodiratime,errors=remount-ro,stripe=256,data=ordered,jqfmt=vfsv0,usrjquota=quota.user,grpjquota=quota.group)
-------------

Regard,
Michael