MySQL is not logging queries into log file
For logging slow queries do like below, It will log all queries those are not using indexes as well as which are taking more than 1 sec

slow_query_log                 = 1
slow_query_log_file            = /var/log/mysqld_slow_query.log
long_query_time                = 1
log-queries-not-using-indexes


For Error log

log-error                      = /var/log/mysqld.log


For general log

general_log_file               = /var/log/mysqld_normal.log
general_log                    = 1