MySQL Server 5 with Galera on Debian

i have installed Debian 7.7 with mysql-server 5.5.34-25.9 and galera 25.2.9. all working fine, my Cluster is running perfectly.

for load balancing i use ha_proxy.

now i have a few questions:

1) if i do a mysqldump on any node, why my website cant connect to the db-server? if i stop the mysqldump, all running fine... the same is if i do that whit mysqldumper

2) how i can backup my databases on the Cluster correctly without Connection lost to the db server? and how i can restore that?

3) how i can monitor my Cluster?

My my cnf Looks like this (from one node):

[mysqld]
user=mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
basedir         = /usr
datadir         = /var/lib/mysql

port=3306
log_error=error.log
#log_output=FILE
#relay_log=relay-bin
### INNODB OPTIONS
innodb_buffer_pool_size=11109M
innodb_additional_mem_pool_size=20M
innodb_flush_log_at_trx_commit=2
innodb_file_per_table=1

## You may want to tune the below depending on number of cores and disk sub
innodb_read_io_threads=4
innodb_write_io_threads=4
innodb_doublewrite=1
innodb_log_file_size=1024M
innodb_log_buffer_size=96M
innodb_buffer_pool_instances=8
innodb_log_files_in_group=2
innodb_thread_concurrency=64
#innodb_file_format=barracuda
innodb_flush_method = O_DIRECT
innodb_locks_unsafe_for_binlog=1
innodb_autoinc_lock_mode=2
## avoid statistics update when doing e.g show tables
innodb_stats_on_metadata=0
engine_condition_pushdown=1
default_storage_engine=innodb

# CHARACTER SET
#collation_server = utf8_unicode_ci
#init_connect='SET NAMES utf8'
#character_set_server = utf8

# REPLICATION SPECIFIC
#server_id must be unique across all mysql servers participating in replication.
#server_id=SERVERID
#auto_increment_increment=2
#auto_increment_offset=SERVERID
binlog_format=ROW
#log_bin=binlog
#log_slave_updates=1
#relay_log=relay-bin
#expire_logs_days=7
# OTHER THINGS, BUFFERS ETC
key_buffer_size = 24M
tmp_table_size = 64M
max_heap_table_size = 64M
max_allowed_packet = 512M
#sort_buffer_size = 256K
#read_buffer_size = 256K
#read_rnd_buffer_size = 512K
#myisam_sort_buffer_size = 8M
skip_name_resolve
memlock=0
sysdate_is_now=1
max_connections=500
thread_cache_size=512
query_cache_type = 0
query_cache_size = 0
table_open_cache=1024
lower_case_table_names=0
##
## WSREP options
##

# Full path to wsrep provider library or 'none'
wsrep_provider=/usr/lib/galera/libgalera_smm.so

wsrep_node_address=10.18.0.11
# Provider specific configuration options
wsrep_provider_options="gcache.size=16384M"

# Logical cluster name. Should be the same for all nodes.
wsrep_cluster_name="db-cluster"

# Group communication system handle
wsrep_cluster_address=gcomm://10.18.0.11,10.18.0.12,10.18.0.13

# Human-readable node name (non-unique). Hostname by default.
wsrep_node_name=10.18.0.11

# Address for incoming client connections. Autodetect by default.
#wsrep_node_incoming_address=

# How many threads will process writesets from other nodes
wsrep_slave_threads=8

# DBUG options for wsrep provider
#wsrep_dbug_option

# Generate fake primary keys for non-PK tables (required for multi-master
# and parallel applying operation)
wsrep_certify_nonPK=1

# Location of the directory with data files. Needed for non-mysqldump
# state snapshot transfers. Defaults to mysql_real_data_home.
#wsrep_data_home_dir=

# Maximum number of rows in write set
wsrep_max_ws_rows=131072

# Maximum size of write set
wsrep_max_ws_size=1073741824

# to enable debug level logging, set this to 1
wsrep_debug=0

# convert locking sessions into transactions
wsrep_convert_LOCK_to_trx=0

# how many times to retry deadlocked autocommits
wsrep_retry_autocommit=1

# change auto_increment_increment and auto_increment_offset automatically
wsrep_auto_increment_control=1

# replicate myisam
wsrep_replicate_myisam=1
# retry autoinc insert, which failed for duplicate key error
wsrep_drupal_282555_workaround=0

# enable "strictly synchronous" semantics for read operations
wsrep_causal_reads=0

# Command to call when node status or cluster membership changes.
# Will be passed all or some of the following options:
# --status  - new status of this node
# --uuid    - UUID of the cluster
# --primary - whether the component is primary or not ("yes"/"no")
# --members - comma-separated list of members
# --index   - index of this node in the list
#wsrep_notify_cmd=

##
## WSREP State Transfer options
##

# State Snapshot Transfer method
wsrep_sst_method=rsync

# Address on THIS node to receive SST at. DON'T SET IT TO DONOR ADDRESS!!!
# (SST method dependent. Defaults to the first IP of the first interface)
#wsrep_sst_receive_address=

# SST authentication string. This will be used to send SST to joining nodes.
# Depends on SST method. For mysqldump method it is root:
wsrep_sst_auth=*****:*****

# Desired SST donor name.
#wsrep_sst_donor=

# Protocol version to use
# wsrep_protocol_version=

[client]
port = 3306
socket=/var/run/mysqld/mysqld.sock
#default_character_set=utf8

[mysqldump]
max_allowed_packet = 512M
[mysqld_safe]
socket          = /var/run/mysqld/mysqld.sock
nice            = 0

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Thanks!

Many greets