我正在设置 MariaDB Galera 集群，但似乎无法让节点相互连接。它们都启动时没有错误，但似乎从未连接，状态始终为断开连接：
MariaDB [(none)]> show status like 'wsrep%';
+--------------------------+----------------------+
| Variable_name | Value |
+--------------------------+----------------------+
| wsrep_cluster_conf_id | 18446744073709551615 |
| wsrep_cluster_size | 0 |
| wsrep_cluster_state_uuid | |
| wsrep_cluster_status | Disconnected |
| wsrep_connected | OFF |
| wsrep_local_index | 18446744073709551615 |
| wsrep_provider_name | |
| wsrep_provider_vendor | |
| wsrep_provider_version | |
| wsrep_ready | ON |
+--------------------------+----------------------+
第一个节点启动方式为：“sudo service mysql start —wsrep-new-cluster”（也尝试传递集群地址，如 —wsrep_cluster_address=gcomm://），并将空地址列表放入 my.cnf 中
第二个节点启动方式为：“sudo service mysql start”，my.cnf 中的集群地址为 gcomm://172.16.56.130,172.16.56.131
无论怎样，集群状态始终为“断开连接”且集群大小为 0。
我对 SST 进行了一些设置以使用 xtrabackup，iptables 防火墙已打开等，但为了尝试找到问题，我关闭了所有内容并采用了最简单的配置，但结果仍然相同。
这是 my.cnf
# MariaDB database server configuration file.
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[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/mysql
tmpdir = /tmp
lc_messages_dir = /usr/share/mysql
lc_messages = en_US
skip-external-locking
bind-address = 0.0.0.0
# * Fine Tuning
max_connections = 100
connect_timeout = 5
wait_timeout = 600
max_allowed_packet = 16M
thread_cache_size = 128
sort_buffer_size = 4M
bulk_insert_buffer_size = 16M
tmp_table_size = 32M
max_heap_table_size = 32M
# * MyISAM
myisam_recover = BACKUP
key_buffer_size = 128M
table_open_cache = 400
myisam_sort_buffer_size = 512M
concurrent_insert = 2
read_buffer_size = 2M
read_rnd_buffer_size = 1M
# * Query Cache Configuration
query_cache_limit = 128K
query_cache_size = 64M
log_warnings = 2
slow_query_log_file = /var/log/mysql/mariadb-slow.log
long_query_time = 10
log_slow_verbosity = query_plan
log_bin = /var/log/mysql/mariadb-bin
log_bin_index = /var/log/mysql/mariadb-bin.index
expire_logs_days = 10
max_binlog_size = 100M
# * InnoDB
innodb_buffer_pool_size = 1G
#innodb_log_file_size = 100M
innodb_log_buffer_size = 8M
innodb_file_per_table = 1
innodb_open_files = 400
innodb_io_capacity = 400
innodb_flush_method = O_DIRECT
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
[isamchk]
key_buffer = 16M
# MariaDB / Galera Cluster Settings
wsrep_provider = /usr/lib/galera/libgalera_smm.so
wsrep_provider_options = "gcache.size=32G"
wsrep_cluster_address = "gcomm://172.16.56.130,172.16.56.131"
wsrep_cluster_name = 'my_galera_cluster'
wsrep_node_address = '172.16.56.131'
wsrep_node_name = 'lou-dev-sc-db2'
wsrep_sst_method = xtrabackup
wsrep_sst_auth = root:rootPa$$
wsrep_slave_threads = 16
binlog_format = ROW
default_storage_engine = InnoDB
innodb_autoinc_lock_mode = 2
innodb_locks_unsafe_for_binlog = 1
innodb_flush_log_at_trx_commit = 2
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
!includedir /etc/mysql/conf.d/
我还意识到 xtrabackup 需要提供访问权限，因此我还从远程服务器为该用户创建了 GRANT 条目，并通过手动登录进行了测试，但仍然没有成功。
有任何想法吗？
答案1
从 show status 输出来看，您的服务器不会加载任何 wsrep 提供程序 (Galera)，甚至可能不会尝试加载。据我所知，mysql 配置文件的工作原理不多，我认为您需要将其放在[mysqld]MariaDB/Galera 设置之前（或将其放在 InnoDB 设置之后）。否则，它们似乎位于该[isamcheck]部分中，并且服务器根本无法解析它们。
答案2
如果在节点之间连接时遇到问题，还请检查防火墙设置和 selinux。我遇到了类似的问题，请查看我的问题无法运行 mariadb 10.1 galera 集群