table_open_cache won't increase above 431 - MariaDB 5.5 Moved a few sites to a new server running CentOS 7, Plesk Onyx, 32gb, 2x480gb SSD, Intel(R) Xeon(R) CPU D-1521 @ 2.40GHz.

[root@server ~]# mysql -V
mysql  Ver 15.1 Distrib 5.5.52-MariaDB, for Linux (x86_64) using readline 5.1


Trying to tune MySQL, but am stuck on the table_open_cache not going above 431.

| Open_tables                              | 431         |


My /etc/my.cnf.d/server.cnf as follows:

skip-name-resolve               = 1

innodb_file_per_table           = 1
innodb_buffer_pool_size         = 16G
innodb_buffer_pool_instances    = 16
innodb_log_file_size            = 2G

tmp_table_size                  = 256M
max_heap_table_size             = 256M

thread_cache_size               = 4
table_open_cache                = 2000

query_cache_type                = 0
query_cache_size                = 12M


Already checked the OS limit:

[root@server /]# ulimit -n
4096


Not sure where to look next.  Any ideas or help would be awesome.
Based on Open_tables being 431, I assume that you have only 431 tables in all the databases?  Or at least only that many are in use?

What is the value of table_open_cache?

What is the value of Table_open_cache_misses / Uptime?  If that is less than, say, 1/sec, then the table_open_cache is "big enough".