超时导致的Galera节点加入集群失败

需求：为galera集群添加新的节点。

初始化新的节点，加入的时候一直报错，加入失败，报错日志如下

 WSREP_SST: [ERROR] Removing /var/lib/mysql//.sst/xtrabackup_galera_info file due to signal (20180420 19:06:51.356)
 WSREP_SST: [ERROR] Cleanup after exit with status: ( ::51.360)
 -- ::  [ERROR] WSREP: Process completed with error: wsrep_sst_xtrabackup-v2 --role 'joiner' --address '172.20.3.11' --datadir '/var/lib/mysql/'   --parent '' --binlog '/var/lib/mysql/mysql-bin' :  (Interrupted system call)
 -- ::  [ERROR] WSREP: Failed to read uuid:seqno and wsrep_gtid_domain_id from joiner script.
 -- ::  [ERROR] WSREP: SST failed:  (Interrupted system call)
 -- ::  [ERROR] Aborting

最后怀疑是由于数据库较大，在同步过程中导致数据库超时报错，解决方法如下：

vim /usr/lib/systemd/system/mariadb.service

[Service]
TimeoutSec=2h

重启mysql，节点正常加入。