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MySQL集群PXC的搭建

2017-05-05 15:35 495 查看

MySQL集群PXC的搭建

最近公司某客户要求我们的数据库搭建PXC集群以保证他们的系统高性能和搞稳定性

以后花费了一些时间去搭建和测试，也踩过一些坑，准备分享出来

系统：centos6.6
PXC：5.6.26

建议关闭iptables， 4个端口 3306,4444,4567,4568
pxc环境所涉及的端口：

#mysql实例端口：3306.

#pxc cluster相互通讯的端口：4567
Port for group communication, default 4567. It can be changed by the option:
wsrep_provider_options ="gmcast.listen_addr=tcp://0.0.0.0:4010; "

#用于SST传送的端口：4444
Port for State Transfer, default 4444. It can be changed by the option:
wsrep_sst_receive_address=10.11.12.205:5555

#用于IST传送的端口：4568
Port for Incremental State Transfer, default port for group communication + 1 (4568). It can be changed by the option:
wsrep_provider_options = "ist.recv_addr=10.11.12.206:7777; "

node1 192.168.3.130
node2 192.168.3.129
node3 192.168.3.128

1.安装软件依赖包（添加repl源，再安装依赖，3台server操作一样。）

rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm yum install perl-IO-Socket-SSL perl-DBD-MySQL perl-Time-HiRes socat nc -y

2.安装xtrabackup（PXC同步数据需要用到）

yum install -y http://www.percona.com/downloads/percona-release/redhat/0.1-3/percona-release-0.1-3.noarch.rpm yum install -y percona-xtrabackup-24

3.下载安装Percona-XtraDB-Cluster

#安装开发包

yum install -y libaio*
yum groupinstall -y 'Development tools'
yum install -y libssl.so.6
ln -sf /usr/lib64/libssl.so.10 /usr/lib64/libssl.so.6
ln -sf /usr/lib64/libcrypto.so.10 /usr/lib64/libcrypto.so.6

wget https://www.percona.com/downloads/Percona-XtraDB-Cluster-56/Percona-XtraDB-Cluster-5.6.26-25.12/binary/tarball/Percona-XtraDB-Cluster-5.6.26-rel74.0-25.12.1.Linux.x86_64.tar.gz tar zxvf Percona-XtraDB-Cluster-5.6.26-rel74.0-25.12.1.Linux.x86_64.tar.gz
useradd -M -s /sbin/nologin mysql
mkdir -p /usr/local/pxc
mkdir -p /data/pxc/mysql3306/{data,tmp,logs}
mv /data/download/Percona-XtraDB-Cluster-5.6.26-rel74.0-25.12.1.Linux.x86_64/* /usr/local/pxc/
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql
echo "export PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile
source /etc/profile
chown -R mysql:mysql /data/pxc/mysql3306/
chown -R mysql:mysql /usr/local/pxc

修改my.cnf配置文件，注意在[mysqld]段落添加PXC的参数：
vi /etc/my.cnf

130

[client]
port            = 3306
socket            = /data/mysql/mysql3306/tmp/mysql.sock

# The MySQL server
[mysqld]
#########Basic##################
explicit_defaults_for_timestamp=true

port            = 3306
user        = mysql
basedir         = /usr/local/mysql
datadir         = /data/mysql/mysql3306/data
tmpdir          = /data/mysql/mysql3306/tmp
pid-file        = /data/mysql/mysql3306/tmp/mysql.pid
socket            = /data/mysql/mysql3306/tmp/mysql.sock
#skip-grant-tables

#character set
character_set_server = utf8

open_files_limit = 65535
back_log = 500
#event_scheduler = ON
#lower_case_table_names=1
skip-external-locking
skip_name_resolve = 1
default-storage-engine = InnoDB

#timeout
wait_timeout=1000
interactive_timeout=1000
connect_timeout = 20

server-id       =1303306  #ip最后一位+端口号= 1003376

#percona 的--recursion-method slavehost模式
#report_host = 10.105.9.115
#report_port = 3306

#plugin
plugin-load="semisync_master.so;semisync_slave.so"

#########error log#############
log-error = /data/mysql/mysql3306/logs/error.log
log-warnings = 2

#########general log#############
#general_log=1
#general_log_file=/data/mysql/mysql3306/logs/mysql.log

#########slow log#############
slow_query_log = 1
long_query_time=1
slow_query_log_file = /data/mysql/mysql3306/logs/mysql.slow

############# for replication###################

log-bin     = /data/mysql/mysql3306/logs/mysql-bin
binlog_format = row
max_binlog_size = 500M
binlog_cache_size = 2M
max_binlog_cache_size = 2M
expire-logs-days = 7
slave-net-timeout=30

log_bin_trust_function_creators = 1
log-slave-updates = 1
skip-slave-start = 1
#read_only =1    #从上设置,5.7是super_read_only

#GTID
gtid-mode = on
binlog_gtid_simple_recovery=1
enforce_gtid_consistency=1

#relay log
relay-log = /data/mysql/mysql3306/logs/mysql-relay
relay-log-index=/data/mysql/mysql3306/logs/relay-bin.index
max-relay-log-size = 500M

#replication crash safe
sync_master_info = 1
sync_relay_log_info = 1
sync_relay_log = 1
relay_log_recovery = 1
master_info_repository = TABLE
relay_log_info_repository = TABLE

#semisync   动态开启 主从切换的时候用
#rpl_semi_sync_master_enabled = 1
#rpl_semi_sync_master_wait_no_slave = 1
#rpl_semi_sync_master_timeout = 1000
#rpl_semi_sync_slave_enabled = 1
#rpl_semi_sync_master_timeout = 100000000 #不要超时,防止切异步,保证主从数据的完全一致性,默认是10000
#rpl_semi_sync_master_wait_point = 'after_sync' #5.7新增参数 after_sync 5.7增强半同步 after_commit5.6普通半同步
#rpl_semi_sync_master_wait_for_slave_count = 2  #5.7新增参数 等待多少个从库接收到binlog

#ignore
#replicate-ignore-db = 'school','school2'
#replicate-do-db = 'school','school2'

#Multi-threaded Slave
#slave_parallel_workers=16
#slave-parallel-type=LOGICAL_CLOCK
#slave-parallel-type=DATABASE

#replication error
#slave-skip-errors=1007,1051,1062

#######per_thread_buffers#####################
max_connections=1100
max_user_connections=1000
max_connect_errors=1000
#myisam_recover
key_buffer_size = 64M
max_allowed_packet = 16M
#table_cache = 3096
table_open_cache = 6144
table_definition_cache = 4096

read_buffer_size = 1M
join_buffer_size = 128K
read_rnd_buffer_size = 1M

#myisam
sort_buffer_size = 128K
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1

myisam_sort_buffer_size = 32M
tmp_table_size = 32M
max_heap_table_size = 64M
query_cache_type=0
query_cache_size = 0
bulk_insert_buffer_size = 32M

thread_cache_size = 64
#thread_concurrency = 32
thread_stack = 192K

###############InnoDB###########################
innodb_data_home_dir = /data/mysql/mysql3306/data
innodb_log_group_home_dir = /data/mysql/mysql3306/logs
innodb_data_file_path = ibdata1:1000M:autoextend

innodb_buffer_pool_size = 1G  #根据内存大小设置

innodb_buffer_pool_instances    = 8
#innodb_additional_mem_pool_size = 16M
innodb_log_file_size = 500M
innodb_log_buffer_size = 16M
innodb_log_files_in_group = 3
innodb_flush_log_at_trx_commit = 1
sync_binlog = 1
innodb_lock_wait_timeout = 10
innodb_sync_spin_loops = 40
innodb_max_dirty_pages_pct = 80
innodb_support_xa = 1
innodb_thread_concurrency = 0
innodb_thread_sleep_delay = 500
innodb_concurrency_tickets = 1000
innodb_flush_method = O_DIRECT
innodb_file_per_table = 1
innodb_read_io_threads = 16
innodb_write_io_threads = 16
innodb_io_capacity = 800  #机械盘800 ssd 2000
innodb_flush_neighbors = 1
innodb_file_format = Barracuda
innodb_purge_threads=1   #5.6只能有一个，5.7可以设置多个
innodb_purge_batch_size = 32
innodb_old_blocks_pct=75
innodb_change_buffering=all
innodb_stats_on_metadata=OFF
innodb_print_all_deadlocks = 1
#innodb_status_output=1
#innodb_status_output_locks=1
performance_schema=0   #是否打开P_S库进行性能收集
transaction_isolation = READ-COMMITTED
#innodb_force_recovery=0
#innodb_fast_shutdown=1
#innodb_status_file = 1  #实时输出show engine innodb status到innodb_status文件

############# PXC #####################
innodb_autoinc_lock_mode=2                             #自增锁的优化
wsrep_cluster_name=pxc-dongzheng                        #集群名字
wsrep_provider=/usr/local/mysql/lib/libgalera_smm.so             #库文件位置
wsrep_cluster_address=gcomm://192.168.3.130,192.168.3.128,192.168.3.129       #节点中所有ip
wsrep_node_address=192.168.3.130           #本节点的ip
wsrep_slave_threads=2                    # 开启的复制线程数，建议cpu核数*2  ，解决apply_cb跟不上问题
wsrep_sst_auth=sst:dongzheng                  #sst模式需要的用户名和密码
wsrep_sst_method=xtrabackup-v2                  #采用什么方式复制数据。还支持mysqldump，rsync
#wsrep_provider_options="debug=1;gcache.size=2G;pc.ignore_quorum=true;pc.ignore_sb=true"              #打开调试模式
wsrep_provider_options="debug=1;gcache.size=2G;"
wsrep_max_ws_rows=131072
wsrep_max_ws_size=16000

[mysqldump]
quick
max_allowed_packet = 128M

[mysql]
no-auto-rehash
max_allowed_packet = 128M
prompt                         = '(product)\u@\h:\p [\d]> '
default_character_set          = utf8

[myisamchk]
key_buffer_size = 64M
sort_buffer_size = 512k
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

[mysqld_safe]
#malloc-lib= /usr/local/mysql/lib/mysql/libjemalloc.so

129

[client]
port            = 3306
socket            = /data/mysql/mysql3306/tmp/mysql.sock

# The MySQL server
[mysqld]
#########Basic##################
explicit_defaults_for_timestamp=true

port            = 3306
user           = mysql
basedir         = /usr/local/mysql
datadir         = /data/mysql/mysql3306/data
tmpdir          = /data/mysql/mysql3306/tmp
pid-file        = /data/mysql/mysql3306/tmp/mysql.pid
socket            = /data/mysql/mysql3306/tmp/mysql.sock
#skip-grant-tables

#character set
character_set_server = utf8

open_files_limit = 65535
back_log = 500
#event_scheduler = ON
#lower_case_table_names=1
skip-external-locking
skip_name_resolve = 1
default-storage-engine = InnoDB

#timeout
wait_timeout=1000
interactive_timeout=1000
connect_timeout = 20

server-id       =1283306  #ip最后一位+端口号= 1003376

#percona 的--recursion-method slavehost模式
#report_host = 10.105.9.115
#report_port = 3306

#plugin
plugin-load="semisync_master.so;semisync_slave.so"

#########error log#############
log-error = /data/mysql/mysql3306/logs/error.log
log-warnings = 2

#########general log#############
#general_log=1
#general_log_file=/data/mysql/mysql3306/logs/mysql.log

#########slow log#############
slow_query_log = 1
long_query_time=1
slow_query_log_file = /data/mysql/mysql3306/logs/mysql.slow

############# for replication###################

log-bin     = /data/mysql/mysql3306/logs/mysql-bin
binlog_format = row
max_binlog_size = 500M
binlog_cache_size = 2M
max_binlog_cache_size = 2M
expire-logs-days = 7
slave-net-timeout=30

log_bin_trust_function_creators = 1
log-slave-updates = 1
skip-slave-start = 1
#read_only =1    #从上设置,5.7是super_read_only

#GTID
gtid-mode = on
binlog_gtid_simple_recovery=1
enforce_gtid_consistency=1

#relay log
relay-log = /data/mysql/mysql3306/logs/mysql-relay
relay-log-index=/data/mysql/mysql3306/logs/relay-bin.index
max-relay-log-size = 500M

#replication crash safe
sync_master_info = 1
sync_relay_log_info = 1
sync_relay_log = 1
relay_log_recovery = 1
master_info_repository = TABLE
relay_log_info_repository = TABLE

#semisync   动态开启 主从切换的时候用
#rpl_semi_sync_master_enabled = 1
#rpl_semi_sync_master_wait_no_slave = 1
#rpl_semi_sync_master_timeout = 1000
#rpl_semi_sync_slave_enabled = 1
#rpl_semi_sync_master_timeout = 100000000 #不要超时,防止切异步,保证主从数据的完全一致性,默认是10000
#rpl_semi_sync_master_wait_point = 'after_sync' #5.7新增参数 after_sync 5.7增强半同步 after_commit5.6普通半同步
#rpl_semi_sync_master_wait_for_slave_count = 2  #5.7新增参数 等待多少个从库接收到binlog

#ignore
#replicate-ignore-db = 'school','school2'
#replicate-do-db = 'school','school2'

#Multi-threaded Slave
#slave_parallel_workers=16
#slave-parallel-type=LOGICAL_CLOCK
#slave-parallel-type=DATABASE

#replication error
#slave-skip-errors=1007,1051,1062

#######per_thread_buffers#####################
max_connections=1100
max_user_connections=1000
max_connect_errors=1000
#myisam_recover
key_buffer_size = 64M
max_allowed_packet = 16M
#table_cache = 3096
table_open_cache = 6144
table_definition_cache = 4096

read_buffer_size = 1M
join_buffer_size = 128K
read_rnd_buffer_size = 1M

#myisam
sort_buffer_size = 128K
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1

myisam_sort_buffer_size = 32M
tmp_table_size = 32M
max_heap_table_size = 64M
query_cache_type=0
query_cache_size = 0
bulk_insert_buffer_size = 32M

thread_cache_size = 64
#thread_concurrency = 32
thread_stack = 192K

###############InnoDB###########################
innodb_data_home_dir = /data/mysql/mysql3306/data
innodb_log_group_home_dir = /data/mysql/mysql3306/logs
innodb_data_file_path = ibdata1:1000M:autoextend

innodb_buffer_pool_size = 1G  #根据内存大小设置

innodb_buffer_pool_instances    = 8
#innodb_additional_mem_pool_size = 16M
innodb_log_file_size = 500M
innodb_log_buffer_size = 16M
innodb_log_files_in_group = 3
innodb_flush_log_at_trx_commit = 1
sync_binlog = 1
innodb_lock_wait_timeout = 10
innodb_sync_spin_loops = 40
innodb_max_dirty_pages_pct = 80
innodb_support_xa = 1
innodb_thread_concurrency = 0
innodb_thread_sleep_delay = 500
innodb_concurrency_tickets = 1000
innodb_flush_method = O_DIRECT
innodb_file_per_table = 1
innodb_read_io_threads = 16
innodb_write_io_threads = 16
innodb_io_capacity = 800  #机械盘800 ssd 2000
innodb_flush_neighbors = 1
innodb_file_format = Barracuda
innodb_purge_threads=1   #5.6只能有一个，5.7可以设置多个
innodb_purge_batch_size = 32
innodb_old_blocks_pct=75
innodb_change_buffering=all
innodb_stats_on_metadata=OFF
innodb_print_all_deadlocks = 1
#innodb_status_output=1
#innodb_status_output_locks=1
performance_schema=0   #是否打开P_S库进行性能收集
transaction_isolation = READ-COMMITTED
#innodb_force_recovery=0
#innodb_fast_shutdown=1
#innodb_status_file = 1  #实时输出show engine innodb status到innodb_status文件

############# PXC #####################
innodb_autoinc_lock_mode=2
wsrep_cluster_name=pxc-dongzheng
wsrep_provider=/usr/local/mysql/lib/libgalera_smm.so
wsrep_cluster_address=gcomm://192.168.3.130,192.168.3.128,192.168.3.129
wsrep_node_address=192.168.3.128
wsrep_slave_threads=2
wsrep_sst_auth=sst:dongzheng
wsrep_sst_method=xtrabackup-v2
#wsrep_provider_options="debug=1;gcache.size=2G;pc.ignore_quorum=true;pc.ignore_sb=true"              #打开调试模式
wsrep_provider_options="debug=1;gcache.size=2G;"
wsrep_max_ws_rows=131072
wsrep_max_ws_size=16000

[mysqldump]
quick
max_allowed_packet = 128M

[mysql]
no-auto-rehash
max_allowed_packet = 128M
prompt                         = '(product)\u@\h:\p [\d]> '
default_character_set          = utf8

[myisamchk]
key_buffer_size = 64M
sort_buffer_size = 512k
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

[mysqld_safe]
#malloc-lib= /usr/local/mysql/lib/mysql/libjemalloc.so

View Code

cd /usr/local/pxc/
./scripts/mysql_install_db --defaults-file=/etc/my.cnf

看到两次ok

#修改启动脚本
vi /etc/init.d/mysql

basedir=/usr/local/pxc
datadir=/data/pxc/mysql3306/data

4.启动，进行授权操作，对于第一个节点必须以特殊方式启动，如下：

/etc/init.d/mysql --help
Usage: mysql {start|stop|restart|restart-bootstrap|reload|force-reload|status|bootstrap-pxc} [ MySQL (Percona XtraDB Cluster) options ]

第一个节点启动

/etc/init.d/mysql bootstrap-pxc

5.安全加固
连接mysql：mysql -uroot -p -S /data/mysql/mysql3306/tmp/mysql.sock
delete from mysql.user where user!='root' or host!='localhost';
truncate table mysql.db;
drop database test;
进行授权，这里用户名密码是my.cnf里定义的用户名sst 密码dongzheng
GRANT ALL PRIVILEGES ON *.* TO 'sst'@'%' identified by 'dongzheng';
use mysql;
UPDATE user SET password=PASSWORD('123456') WHERE user='root';
flush privileges;
PXC状态确认
show global status like 'wsrep%';

6.netstat进行查看，可以发现启动两个端口
netstat -lntp | grep mysql
tcp 0 0 0.0.0.0:4567 0.0.0.0:* LISTEN 2964/mysqld
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2964/mysqld

另外两个节点的启动和配置

node2 my.cnf的PXC 配置节：
############# PXC #####################
innodb_autoinc_lock_mode=2 #自增锁的优化
wsrep_cluster_name=pxc-dongzheng #集群名字
wsrep_provider=/usr/local/mysql/lib/libgalera_smm.so #库文件
wsrep_cluster_address=gcomm://192.168.2.130,192.168.3.128,192.168.0.129 #节点中所有ip
wsrep_node_address=192.168.0.129 #节点的ip
wsrep_slave_threads=2 #开启的复制线程数，cpu核数*2
wsrep_sst_auth=sst:dongzheng #sst模式需要的用户名和密码
wsrep_sst_method=xtrabackup-v2 #采用什么方式复制数据。还支持mysqldump，rsync
wsrep_provider_options="debug=1;socket.checksum=1" #打开调试模式

node3 my.cnf的PXC 配置节：
############# PXC #####################
innodb_autoinc_lock_mode=2 #自增锁的优化
wsrep_cluster_name=pxc-dongzheng #集群名字
wsrep_provider=/usr/local/mysql/lib/libgalera_smm.so #库文件
wsrep_cluster_address=gcomm://192.168.2.130,192.168.3.128,192.168.0.129 #节点中所有ip
wsrep_node_address=192.168.0.128 #节点的ip
wsrep_slave_threads=2 #开启的复制线程数，cpu核数*2
wsrep_sst_auth=sst:dongzheng #sst模式需要的用户名和密码
wsrep_sst_method=xtrabackup-v2 #采用什么方式复制数据。还支持mysqldump，rsync
wsrep_provider_options="debug=1;socket.checksum=1" #打开调试模式

启动
/etc/init.d/mysql start

启动的时候会把主节点的所有数据传送过从节点包括所有数据库和日志，简单来讲从节点在启动的时候会做SST同步

从节点不需要做安全加固，因为从节点跟主节点的数据库和数据都一样

PXC状态确认
show global status like 'wsrep%';

netstat进行查看，可以发现启动两个端口
netstat -lntp | grep mysql
tcp 0 0 0.0.0.0:4567 0.0.0.0:* LISTEN 2964/mysqld
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2964/mysqld

###############################################################
集群关闭
所有节点都用
/etc/init.d/mysql stop

节点重启
第一个节点用：/etc/init.d/mysql restart-bootstrap
其他节点用：/etc/init.d/mysql restart

集群关闭之后，再启动，谁做第一个节点谁就执行/etc/init.d/mysql bootstrap-pxc

如果不是所有节点都关闭，那么当启动集群节点的时候不需要执行/etc/init.d/mysql bootstrap-pxc

/etc/init.d/mysql --help
Usage: mysql {start|stop|restart|restart-bootstrap|reload|force-reload|status|bootstrap-pxc} [ MySQL (Percona XtraDB Cluster) options ]

到这里搭建就基本结束了。3个节点同时支持read/write操作。

新加入节点

只需要安装好Percona-XtraDB-Cluster，并且在 my.cnf 添加PXC 配置节即可

报错处理

（1）加载 so 文件加不到

如：

Installing    MySQL    system    tables...
/usr/local/mysql/bin/mysqld:    error    while    loading    shared    libraries:    libssl.so.6:    cannot    open
shared    object    file:    No    such    file    or    directory

可能的问题：

openssl 没装：

yum    install    –y    openssl    openssl-devel

如果提示已经安装，可以使用

updatedb

locate    libssl.so

然后用

ldd    /usr/local/mysql/bin/mysqld

查看还有那些依赖需安装

确认一下：

看样子都是存在的，但版本不对。做一个软链就可以修复了。

#cd /usr/lib64/

最后在用ldd /usr/local/mysql/bin/mysqld 去确认是否有没加载的so, 如果存在同样的方法修复。

（2）安装中 socat 找不到

/usr/local/pxc_56/bin/mysqld_safe --defaults-file=/home/mysql/my3307.cnf --ledir=/usr/local/pxc_56/bin/ &
有可能启动会提示：
[b]WSREP_SST: [ERROR] socat not found [/b][b]in path:[/b] /usr/sbin:/sbin:/usr/local/pxc_56//bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/lamp/mysql/bin:/root/bi
n (20160509 10:58:04.404)
2016-05-09 10:58:04 54809 [ERROR] WSREP: Failed to read 'ready <addr>' from: wsrep_sst_xtrabackup-v2 --role 'joiner' --address '192.168.1.238' --datadir '/home/mysql/I3307/
' --defaults-file '/home/mysql/I3307/my3307.cnf' --defaults-group-suffix '' --parent '54809'  ''
Read: '(null)'
2016-05-09 10:58:04 54809 [ERROR] WSREP: Process completed with error: wsrep_sst_xtrabackup-v2 --role 'joiner' --address '192.168.1.238' --datadir '/home/mysql/I3307/' --de
faults-file '/home/mysql/I3307/my3307.cnf' --defaults-group-suffix '' --parent '54809'  '' : 2 (No such file or directory)
2016-05-09 10:58:04 54809 [ERROR] WSREP: Failed to prepare for 'xtrabackup-v2' SST. Unrecoverable.
2016-05-09 10:58:04 54809 [ERROR] Aborting

socat 包没装上，可以把epel 的源加入就可以安装。

yum install -y socat

因为在my.cnf里写错ip，导致出现下面错误，改正my.cnf就可以了

wsrep_cluster_address=gcomm://192.168.2.130,192.168.3.128,192.168.0.129
wsrep_node_address=192.168.1.130

2017-05-05 09:42:33 2902 [ERROR] WSREP: failed to open gcomm backend connection: 110: failed to reach primary view: 110 (Connection timed out)
at gcomm/src/pc.cpp:connect():162
2017-05-05 09:42:33 2902 [ERROR] WSREP: gcs/src/gcs_core.cpp:gcs_core_open():206: Failed to open backend connection: -110 (Connection timed out)
2017-05-05 09:42:33 2902 [ERROR] WSREP: gcs/src/gcs.cpp:gcs_open():1379: Failed to open channel 'pxc-dongzheng' at 'gcomm://192.168.2.130,192.168.3.128,192.168.0.129': -110 (Connection timed out)
2017-05-05 09:42:33 2902 [ERROR] WSREP: gcs connect failed: Connection timed out
2017-05-05 09:42:33 2902 [ERROR] WSREP: wsrep::connect(gcomm://192.168.2.130,192.168.3.128,192.168.0.129) failed: 7
2017-05-05 09:42:33 2902 [ERROR] Aborting

关于PXC版本

如果是安装5.6.24版本或以上的需要下载openssl

centos6和centos7需要openssl版本1.0 https://www.percona.com/doc/percona-server/5.6/installation.html#installing-percona-server-from-a-binary-tarball In Percona Server 5.6.24-72.2 and newer, the single binary tarball was replaced with multiple tarballs depending on the OpenSSL library available in the distribution:

ssl100 - for all Debian/Ubuntu versions except Debian Squeeze (libssl.so.1.0.0 => /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0 (0x00007f2e389a5000));
ssl098 - only for Debian Squeeze (libssl.so.0.9.8 => /usr/lib/libssl.so.0.9.8 (0x00007f9b30db6000));
ssl101 - for CentOS 6 and CentOS 7 (libssl.so.10 => /usr/lib64/libssl.so.10 (0x00007facbe8c4000));
ssl098e - to be used only for CentOS 5 (libssl.so.6 => /lib64/libssl.so.6 (0x00002aed5b64d000)).

下载地址 https://www.percona.com/downloads/Percona-XtraDB-Cluster-56/LATEST/binary/tarball/

运维注意

（1）不能同时关闭所有节点，原则要保持Group里最少一个成员活着，否则全部传SST不能同时关闭所有节点，原则要保持Group里最少一个成员活着，否则全部传SST，gcache丢失

（2）node1 是整个集群的老大
其它节点加进来发现数据不一致，以老大为准
会有丢数据风险

（3）其中一个节点死掉了，还有2个节点
发现整个集群还能活，要设置忽略脑裂
忽略脑裂的命令
SET GLOBAL wsrep_provider_options="pc.ignore_sb=true;pc.ignore_quorum=true";

（4）最好单节点写入，不然更新同一行记录会出问题

（5）尽量用pt-online-schema-change 做表结构变更

（6）mysql库全是MyISAM引擎不能复制
MyISAM引擎不能被复制，PXC只支持Innodb
DCL语句可以复制： create user， drop user, grant ,revoke

（7）整个集群节点数最好为3，最多是8个

（8）pxc结构里面每个表必须有主键

（9）writeSet的大小
下面两个参数控制写入集大小
wsrep_max_ws_rows 没有默认值，默认没有限制
wsrep_max_ws_size 默认单位字节，建议不要超过16KB，16000
my.cnf
wsrep_max_ws_rows=131072
wsrep_max_ws_size=16000

允许最大的事务大小由wsrep_max_ws_rows和wsrep_max_ws_size定义，超过这个大小事务会被抛弃
LOAD DATA INFILE ...每1万行提交一次.对于LOAD DATA中的大事务会被分割成多个小事务来执行.

参考文章： http://www.cnblogs.com/zejin2008/p/5475285.html https://www.percona.com/doc/percona-xtradb-cluster/5.6/wsrep-provider-index.html https://www.percona.com/doc/percona-xtradb-cluster/5.6/wsrep-system-index.html http://galeracluster.com/documentation-webpages/monitoringthecluster.html

如有不对的地方，欢迎大家拍砖o(∩_∩)o

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