Add file 'README.missing-socket-directory'.

README.missing-socket-directory

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+##
+#
+# MySQL and MariaDB socket-file/pid-file folder issues – how to fix
+#
+##
+
+# ----------
+# There are 2 possibilities to force creating a folder on ech boot.
+# ----------
+
+
+# ----------
+#
+# 1.) Add 'ExecStartPre' directive to systemd service file:
+#
+#    ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld
+#
+# ----------
+
+MYSQL_USER=mysql
+SOCKET_DIR="/var/run/mysqld"
+MYSQL_SERVICE_FILE="/root/mysql.service"
+
+perl -i -n -p -e "s&^(PermissionsStartOnly=.*)&\1\n\nExecStartPre=/usr/bin/install -m 755 -o $MYSQL_USER -g root -d $SOCKET_DIR&" $MYSQL_SERVICE_FILE 
+
+
+# ----------
+#
+# 2.) Create file /etc/tmpfiles.d/mysql.conf file with content:
+#
+#    # systemd tmpfile settings for mysql or mariadb
+#    d /var/run/mysqld 0755 mysql mysql -
+#
+# see also: 
+#    https://www.ryadel.com/en/linux-mysql-mariadb-pid-file-folder-fix/
+#
+# ----------
+
+# Force systemd to create such folder on each startup.  We can easily do that following the steps below:
+#
+#    - Create a new /etc/tmpfiles.d/mysql.conf file with content:
+#
+#       # systemd tmpfile settings for mysql or mariadb
+#       d /var/run/mysqld 0755 mysql mysql -
+#
+cat <<EOF > /etc/tmpfiles.d/mysql.conf
+# systemd tmpfile settings for mysql or mariadb
+d /var/run/mysqld 0755 mysql mysql -
+EOF
+
+