搭建mysql5.7多主架构Galera Cluster
所有节点执行
关闭防火墙
systemctl status firewalld
关闭selinux
sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
setenforce 0
getenforce
创建数据目录
mkdir -p /data/mysql/mysqldata
mkdir -p /data/mysql/log
mkdir -p /data/mysql/log/error.log
chown -R mysql:mysql /data/mysql
安装 Percona 仓库
yum install -y https://repo.percona.com/yum/percona-release-latest.noarch.rpm
启用 Percona XtraDB Cluster 5.7 仓库
percona-release setup pxc-57
安装 Percona XtraDB Cluster
yum install -y Percona-XtraDB-Cluster-57
节点1配置文件
cat /etc/my.cnf
[mysql]
prompt = [\\u@\\h][\\d]>\\_
socket=/tmp/mysql.sock
[mysqld]
# basic settings #
user = mysql
sql_mode = "NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO"
character_set_server=utf8mb4
collation_server=utf8mb4_bin
default-storage-engine=innodb
pid-file=/data/mysql/mysqldata/mysql.pid
socket=/tmp/mysql.sock
basedir= /usr/local/mysql
datadir=/data/mysql/mysqldata
tmpdir=/tmp
transaction-isolation = READ-COMMITTED
explicit_defaults_for_timestamp = 1
lower_case_table_names=1
max_allowed_packet = 32M
slave_pending_jobs_size_max = 32M
event_scheduler = 1
server-id=1
port=3306
symbolic-links=0
sysdate-is-now
show_compatibility_56=on
back_log=1000
# connection #
interactive_timeout = 200
wait_timeout = 200
lock_wait_timeout = 1800
skip_name_resolve = 1
max_connections = 2000
max_connect_errors = 100000
# table cache performance settings #
table_open_cache = 3000
table_definition_cache = 4096
table_open_cache_instances = 16
# session memory settings #
read_buffer_size = 2M
read_rnd_buffer_size = 16M
sort_buffer_size = 4M
tmp_table_size = 100M
max_heap_table_size = 100M
join_buffer_size = 4M
thread_cache_size = 64
# log settings #
general_log_file=/data/mysql/log/general.log
log-error=/data/mysql/log/error.log
slow_query_log = 1
long_query_time = 4
slow_query_log_file=/data/mysql/log/slow-query.log
log_queries_not_using_indexes = 1
log_slow_admin_statements = 1
log_throttle_queries_not_using_indexes = 10
binlog-rows-query-log-events = 1
log-bin=/data/mysql/mysqldata/mysql-bin
log-bin-index=/data/mysql/mysqldata/mysql-bin.index
log_bin_trust_function_creators = 1
binlog_cache_size=4M
max_binlog_cache_size = 4096M
max_binlog_size = 1024M
expire-logs-days=3
log_timestamps=system
log_error_verbosity=2
# innodb settings #
innodb_page_size = 16384
innodb_data_home_dir=/data/mysql/mysqldata
innodb_data_file_path=ibdata1:1024M:autoextend
innodb_buffer_pool_size = 8G
innodb_buffer_pool_instances = 1
innodb_buffer_pool_dump_pct = 40
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_lru_scan_depth = 4096
innodb_lock_wait_timeout = 50
innodb_rollback_on_timeout=1
innodb_flush_log_at_trx_commit = 2
innodb_io_capacity = 200
innodb_max_dirty_pages_pct =75
innodb_io_capacity_max = 1000
innodb_flush_method = O_DIRECT
innodb_file_format = Barracuda
innodb_file_format_max = Barracuda
innodb_undo_directory=/data/mysql/mysqldata
innodb_undo_logs = 128
innodb_undo_tablespaces = 3
innodb_undo_log_truncate = 1
innodb_max_undo_log_size = 2G
innodb_purge_threads = 4
innodb_purge_rseg_truncate_frequency = 128
innodb_flush_neighbors = 0
innodb_log_buffer_size = 64M
innodb_log_file_size = 256M
innodb_log_files_in_group = 2
innodb_log_group_home_dir=/data/mysql/mysqldata
innodb_page_cleaners = 16
innodb_large_prefix = 1
innodb_thread_concurrency = 64
innodb_sync_spin_loops=0
innodb_print_all_deadlocks = 1
innodb_strict_mode = 1
innodb_sort_buffer_size = 67108864
innodb_write_io_threads = 16
innodb_read_io_threads = 16
innodb_file_per_table = 1
innodb_stats_persistent_sample_pages = 64
innodb_autoinc_lock_mode = 2
innodb_online_alter_log_max_size=1G
innodb_open_files=4096
loose_innodb_numa_interleave=1
# about query_cache #
query_cache_type=0
query_cache_size=0
# Galera Provider Configuration #
wsrep_on=ON
wsrep_provider=/usr/lib64/galera3/libgalera_smm.so
# Galera Cluster Configuration #
wsrep_cluster_name="mysql_galera_cluster"
wsrep_cluster_address="gcomm://192.168.132.64,192.168.132.65,192.168.132.66"
# Galera Node Configuration #
wsrep_node_address="192.168.132.64"
wsrep_node_name=prod-db-4
wsrep_sst_receive_address="192.168.132.64:4444"
# Galera SST Configuration #
wsrep_sst_method=xtrabackup-v2
wsrep_sst_auth=sstuser:sstpassword
# Galera Configuration #
wsrep_slave_threads=16
wsrep_certify_nonPK=1
wsrep_max_ws_rows=131072
wsrep_max_ws_size=1073741824
wsrep_debug=0
wsrep_convert_LOCK_to_trx=0
wsrep_retry_autocommit=1
wsrep_auto_increment_control=1
wsrep_drupal_282555_workaround=0
wsrep_causal_reads=0
wsrep_notify_cmd=
# replication settings #
binlog_format=ROW
default_storage_engine=InnoDB
innodb_autoinc_lock_mode=2
innodb_locks_unsafe_for_binlog=1
[mysqldump]
quick
max_allowed_packet = 32M
[mysqld_safe]
user=mysql
open-files-limit=65536
log-error=/data/mysql/log/error.log
节点2 配置文件差异
server-id=2
wsrep_node_address="192.168.132.65"
wsrep_node_name=prod-db-5
wsrep_sst_receive_address="192.168.132.65:4444"
wsrep_cluster_address="gcomm://192.168.132.64,192.168.132.65,192.168.132.66"
节点3 配置文件差异
server-id=3
wsrep_node_address="192.168.132.66"
wsrep_node_name=prod-db-6
wsrep_sst_receive_address="192.168.132.66:4444"
wsrep_cluster_address="gcomm://192.168.132.64,192.168.132.65,192.168.132.66"
初始化数据目录（使用--initialize-insecure生成空密码）
mysqld --initialize-insecure --user=mysql --datadir=/data/mysql/mysqldata
第一个节点操作
以引导模式启动
mysqld_safe --wsrep-new-cluster --user=mysql &
创建sst用户
CREATE USER 'sstuser'@'localhost' IDENTIFIED BY 'sstpassword';
GRANT RELOAD, LOCK TABLES, PROCESS, REPLICATION CLIENT ON *.* TO 'sstuser'@'localhost';
FLUSH PRIVILEGES;
第二个节点操作
检查my.cnf的配置里galera库路径是否正确
wsrep_provider=/usr/lib64/galera3/libgalera_smm.so
不对的话启动会失败，通过find查询一下路径
find / -name "libgalera_smm.so" 2>/dev/null
启动mysql
mysqld_safe --user=mysql --datadir=/data/mysql/mysqldata &
ps -ef |grep mysql
第三个节点的操作同第二个节点一样
检查集群状态
检查集群节点
SHOW STATUS LIKE 'wsrep_cluster_size%';
检查集群状态
SHOW STATUS LIKE 'wsrep_cluster_status';
检查集群连接状态
SHOW STATUS LIKE 'wsrep_connected%';
检查节点是否准备就绪
SHOW STATUS LIKE 'wsrep_ready%';
检查节点同步状态
SHOW STATUS LIKE 'wsrep_local_state_comment%';
关键正常状态
wsrep_cluster_size: 2 # 集群有2个节点
wsrep_cluster_status: Primary # 集群状态正常
wsrep_connected: ON # 集群连接正常
wsrep_ready: ON # 节点准备就绪
wsrep_local_state_comment: Synced # 节点已同步
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