MariaDB dedicated mysql server tuning

I have split a magento 2 install across two droplets, one for mysql and the other for everything else. I just wanted to change the my.cnf to use more resources since it won't be running anything but that.

• CentOS Version: CentOS 7 64 bit
  
• Centmin Mod Version Installed: 123.09beta01.b088
• MariaDB MySQL Version Installed: 10.1.37-MariaDB

Code:

[client]
socket=/var/lib/mysql/mysql.sock

[mysql]
max_allowed_packet = 64M

[mysqld]
ignore_db_dirs=cmsetiofiotest
local-infile=0
ignore_db_dirs=lost+found
character-set-server=utf8
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

#bind-address=127.0.0.1
# optimized my.cnf for MariaDB 5.5.x
# by eva2000
# vbtechsupport.com

tmpdir=/home/mysqltmp

innodb=ON
#skip-federated
##skip-pbxt
##skip-pbxt_statistics
#skip-archive
#skip-name-resolve
#old_passwords
back_log = 512
max_connections = 500
key_buffer_size = 256M
myisam_sort_buffer_size = 256M
myisam_max_sort_file_size = 2048M
join_buffer_size = 256K
read_buffer_size = 256K
sort_buffer_size = 256K
table_definition_cache = 8192
table_open_cache = 4096
thread_cache_size = 256
wait_timeout = 1800
connect_timeout = 10
tmp_table_size = 256M
max_heap_table_size = 256M
max_allowed_packet = 64M
#max_seeks_for_key = 4294967295
#group_concat_max_len = 1024
max_length_for_sort_data = 1024
net_buffer_length = 16384
max_connect_errors = 100000
concurrent_insert = 2
read_rnd_buffer_size = 512K
bulk_insert_buffer_size = 8M
# query_cache boost for MariaDB >10.1.2+
# https://community.centminmod.com/posts/30811/
query_cache_limit = 1024K
query_cache_size = 80M
query_cache_type = 1
query_cache_min_res_unit = 2K
query_prealloc_size = 262144
query_alloc_block_size = 65536
transaction_alloc_block_size = 8192
transaction_prealloc_size = 4096
default-storage-engine = InnoDB

log_warnings=1
slow_query_log=0
long_query_time=1
slow_query_log_file=/var/lib/mysql/slowq.log
log-error=/var/log/mysqld.log

# innodb settings
innodb_large_prefix=1
innodb_purge_threads = 2
innodb_file_format = Barracuda
innodb_file_per_table = 1
innodb_open_files = 4000
innodb_data_file_path= ibdata1:10M:autoextend
innodb_buffer_pool_size = 512M

## https://mariadb.com/kb/en/mariadb/xtradbinnodb-server-system-variables/#innodb_buffer_pool_instances
innodb_buffer_pool_instances=1

innodb_log_files_in_group = 2
innodb_log_file_size = 256M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 2
#innodb_thread_concurrency = 12
innodb_lock_wait_timeout=50
innodb_flush_method = O_DIRECT
innodb_support_xa=1

# 200 * # DISKS
innodb_io_capacity = 1200
innodb_io_capacity_max = 2400
innodb_read_io_threads = 2
innodb_write_io_threads = 2
innodb_flush_neighbors = 0

# mariadb settings
[mariadb]
#thread-handling = pool-of-threads
#thread-pool-size= 20
#mysql --port=3307 --protocol=tcp
#extra-port=3307
#extra-max-connections=1

userstat = 0
key_cache_segments = 1
aria_group_commit = none
aria_group_commit_interval = 0
aria_log_file_size = 768M
aria_log_purge_type = immediate
aria_pagecache_buffer_size = 768M
aria_sort_buffer_size = 192M

[mariadb-5.5]
innodb_file_format = Barracuda
innodb_file_per_table = 1

#ignore_db_dirs=
query_cache_strip_comments=0

innodb_read_ahead = linear
innodb_adaptive_flushing_method = estimate
innodb_flush_neighbor_pages = 1
innodb_stats_update_need_lock = 0
innodb_log_block_size = 512

log_slow_filter =admin,filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk

[mysqld_safe]
socket=/var/lib/mysql/mysql.sock
log-error=/var/log/mysqld.log
#nice = -5
open-files-limit = 8192

[mysqldump]
quick
max_allowed_packet = 64M

[myisamchk]
tmpdir=/home/mysqltmp
key_buffer = 256M
sort_buffer = 32M
read_buffer = 32M
write_buffer = 32M

[mysqlhotcopy]
interactive-timeout

[mariadb-10.0]
innodb_file_format = Barracuda
innodb_file_per_table = 1

# 2 variables needed to switch from XtraDB to InnoDB plugins
#plugin-load=ha_innodb
#ignore_builtin_innodb

## MariaDB 10 only save and restore buffer pool pages
## warm up InnoDB buffer pool on server restarts
#innodb_buffer_pool_dump_at_shutdown=1
#innodb_buffer_pool_load_at_startup=1
innodb_buffer_pool_populate=0
## Disabled settings
performance_schema=OFF
innodb_stats_on_metadata=OFF
innodb_sort_buffer_size=2M
innodb_online_alter_log_max_size=128M
query_cache_strip_comments=0
log_slow_filter =admin,filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk

[mariadb-10.1]
innodb_file_format = Barracuda
innodb_default_row_format = dynamic
innodb_file_per_table = 1

## wsrep specific
# wsrep_on=OFF
# wsrep_provider
# wsrep_cluster_address
# binlog_format=ROW
# default_storage_engine=InnoDB
# innodb_autoinc_lock_mode=2
# innodb_doublewrite=1
# query_cache_size=0

# 2 variables needed to switch from XtraDB to InnoDB plugins
#plugin-load=ha_innodb
#ignore_builtin_innodb

## MariaDB 10 only save and restore buffer pool pages
## warm up InnoDB buffer pool on server restarts
#innodb_buffer_pool_dump_at_shutdown=1
#innodb_buffer_pool_load_at_startup=1
innodb_buffer_pool_populate=0
## Disabled settings
performance_schema=OFF
innodb_stats_on_metadata=OFF
innodb_sort_buffer_size=2M
innodb_online_alter_log_max_size=128M
query_cache_strip_comments=0
log_slow_filter =admin,filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk

# Defragmenting unused space on InnoDB tablespace
innodb_defragment=1
innodb_defragment_n_pages=7
innodb_defragment_stats_accuracy=0
innodb_defragment_fill_factor_n_recs=20
innodb_defragment_fill_factor=0.9
innodb_defragment_frequency=40

Code:

> free -h
              total        used        free      shared  buff/cache   available
Mem:           7.6G        1.9G        139M         45M        5.6G        5.4G
Swap:          1.0G        106M        917M

So it seems I have a lot of RAM I could play with, what would be best to up to make the dedicated server make better use of its resources? Thank you.

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