MariaDB is ignoring /etc/my.cnf

Question

The variable I am trying to change is innodb_buffer_pool_size. As you can see below the settings is 512M. But SELECT @@innodb_buffer_pool_size; returns 134217728.

When I execute: /usr/libexec/mysqld --help --verbose

My resulting config is:

Default options are read from the following files in the given order: 
/etc/mysql/my.cnf /etc/my.cnf ~/.my.cnf

1. /etc/mysql/my.cnf - does not exist
2. /etc/my.cnf - is shown below
3. ~/.my.cnf - when I cd ~/ I am taken to /root where no my.cnf files exist. Does mysql run as root, would it be taken to the same directory? How can I tell?

Here is my.cnf

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
symbolic-links=0
#
# include all files from the config directory
#
!includedir /etc/my.cnf.d

skip-networking

innodb_thread_concurrency = 6
innodb_flush_log_at_trx_commit = 2
thread_concurrency = 12 
table_cache = 1024
query_cache_size = 64M
query_cache_type=1
query_cache_limit = 4M
expire_logs_days=10
max_binlog_size=100M
join_buffer_size = 8M
tmp_table_size =256M  
max_allowed_packet = 2M
thread_stack = 192K
thread_cache_size = 32
thread_concurrency = 4
table_open_cache  = 4096
myisam-recover=BACKUP
max_connections        = 2500
max_heap_table_size = 256M
read_buffer_size = 2M
read_rnd_buffer_size = 16M
bulk_insert_buffer_size = 64M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_max_extra_sort_file_size = 10G
myisam_repair_threads = 1
innodb_additional_mem_pool_size = 8M
innodb_log_buffer_size = 4M
innodb_log_file_size = 128M
innodb_log_files_in_group = 2
innodb_flush_log_at_trx_commit = 0
innodb_buffer_pool_size = 512M
innodb_data_home_dir = /var/lib/mysql/
innodb_data_file_path = ibdata1:256M:autoextend
innodb_autoextend_increment=512
slow_query_log = Off
slow_query_log_file = /var/www/html/log/mysql/slow-queries.log
long_query_time = 2
innodb_file_per_table = 1 

[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid


[mysqldump]
quick
quote-names
max_allowed_packet      = 16M

[isamchk]
key_buffer              = 32M

Answer 1

I am also observing the same issues, I would suggest to please check the permissions to the mentioned path of my.cnf and the path mentioned by my.cnf.

Answer 2

Late answer, but: check /etc/init.d/mysql

Mariadb still (18.04) installs an init script with

MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"

and mysqladmin claims to read /etc/my.cnf, /etc/mysql/my.cnf, which is not true. Just remove the --defaults-file=/etc/mysql/debian.cnf part in /etc/init.d/mysql