This file is indexed.

/etc/mysql/percona-xtradb-cluster.conf.d/mysqld.cnf is in percona-xtradb-cluster-server-5.6 5.6.21-25.8-0ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# The Percona XtraDB Cluster 5.6 configuration file.
#
# 
# 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

[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/percona-xtradb-cluster
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	= 16M
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
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/percona-xtradb-cluster.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/percona-xtradb-cluster
#
# 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
#
# * Galera
#
# Path to Galera library
#wsrep_provider=/usr/lib/libgalera_smm.so
#
# Add address of other cluster nodes here
#wsrep_cluster_address=gcomm://aaa.bbb.ccc.ddd,aaa.bbb.ccc.ddd
#log_bin
# In order for Galera to work correctly binlog format should be ROW
#binlog_format=ROW
#
# MyISAM storage engine has only experimental support
#default_storage_engine=InnoDB
#
# This changes how InnoDB autoincrement locks are managed and is a requirement for Galera
#innodb_autoinc_lock_mode=2
#
# Node #1 address
#wsrep_node_address=aaa.bbb.ccc.ddd
#
# SST method
#wsrep_sst_method=xtrabackup-v2
#
# Cluster name
#wsrep_cluster_name=my_ubuntu_cluster
#
# Authentication for SST method
#wsrep_sst_auth="sstuser:s3cretPass"