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show variables like 'innodb_log_file_size';

mysql> show variables like 'inno_log_file_size';
Empty set (0.01 sec)

mysql> show variables like 'innodb_log_file_size';
+----------------------+---------+
| Variable_name        | Value   |
+----------------------+---------+
| innodb_log_file_size | 5242880 |
+----------------------+---------+
1 row in set (0.00 sec)

cat /etc/mysql/my.cnf

/etc/mysql/my.cnf
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port            = 3306
socket          = /var/run/mysqld/mysqld.sock

# Here is entries for some specific programs
# The following values assume you have at least 32M ram

# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket          = /var/run/mysqld/mysqld.sock
nice            = 0


#innodb
innodb_log_file_size            = 512M
#innodb_buffer_pool_size                = 800M

[mysqld]
#
# * Basic Settings
#
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address            = 127.0.0.1
#
# * Fine Tuning
#
key_buffer              = 16M
max_allowed_packet      = 20M
thread_stack            = 192K
thread_cache_size       = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover         = BACKUP
#max_connections        = 100
#table_cache            = 64
#thread_concurrency     = 10
#
# * Query Cache Configuration
#
query_cache_limit       = 1M
query_cache_size        = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file        = /var/log/mysql/mysql.log
#general_log             = 1
#
# Error log - should be very few entries.
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#log_slow_queries       = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to change.
#server-id              = 1
#log_bin                        = /var/log/mysql/mysql-bin.log
expire_logs_days        = 10
max_binlog_size         = 100M
#binlog_do_db           = include_database_name
#binlog_ignore_db       = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
 innodb_log_file_size = 265M
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem



[mysqldump]
quick
quote-names
max_allowed_packet      = 16M

[mysql]
#no-auto-rehash # faster start of mysql but no tab completition

[isamchk]
key_buffer              = 16M

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/

ls /etc/mysql/conf.d/

ls -la /etc/mysql/conf.d/
total 12
drwxr-xr-x 2 root root 4096 Nov  2 11:08 .
drwxr-xr-x 3 root root 4096 Jan  7 21:09 ..
-rw-r--r-- 1 root root    0 Feb 20  2014 .keepme
-rw-r--r-- 1 root root   21 Feb 20  2014 mysqld_safe_syslog.cnf

160107 21:14:53 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
160107 21:14:53 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
160107 21:14:53 [Note] /usr/sbin/mysqld (mysqld 5.5.46-0ubuntu0.14.04.2-log) starting as process 12943 ...
160107 21:14:53 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.
160107 21:14:53 [Note] Plugin 'FEDERATED' is disabled.
160107 21:14:53 InnoDB: The InnoDB memory heap is disabled
160107 21:14:53 InnoDB: Mutexes and rw_locks use GCC atomic builtins
160107 21:14:53 InnoDB: Compressed tables use zlib 1.2.8
160107 21:14:53 InnoDB: Using Linux native AIO
160107 21:14:53 InnoDB: Initializing buffer pool, size = 128.0M
160107 21:14:53 InnoDB: Completed initialization of buffer pool
InnoDB: Error: log file ./ib_logfile0 is of different size 0 5242880 bytes
InnoDB: than specified in the .cnf file 0 277872640 bytes!
160107 21:14:53 [ERROR] Plugin 'InnoDB' init function returned error.
160107 21:14:53 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
160107 21:14:53 [ERROR] Unknown/unsupported storage engine: InnoDB
160107 21:14:53 [ERROR] Aborting

160107 21:14:53 [Note] /usr/sbin/mysqld: Shutdown complete

160107 21:14:53 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended