MySQL NDB管理节点根据config.ini得到不同的节点IP地址

Question

我正在接触一个MySQL HA配置。目前，我在管理节点上设置了config.ini：

root@ndb-mgmd:~# cat config.ini |grep -v ^#

[tcp default] 
SendBufferMemory=2M 
ReceiveBufferMemory=2M

[ndb_mgmd default] 
DataDir=/var/lib/mysql-cluster


[ndb_mgmd] 
HostName=ndb-mgmd


[ndbd default] 

NoOfReplicas=2


LockPagesInMainMemory=1


DataMemory=100M 
IndexMemory=50M

NoOfFragmentLogFiles=300 
DataDir=/var/lib/mysql-cluster 
MaxNoOfConcurrentOperations=1000

SchedulerSpinTimer=400 
SchedulerExecutionTimer=100 
RealTimeScheduler=1

TimeBetweenGlobalCheckpoints=1000 
TimeBetweenEpochs=200 RedoBuffer=32M

MaxNoOfTables=1024 
MaxNoOfOrderedIndexes=256

[ndbd] 
HostName=192.168.0.20

[ndbd] 
HostName=192.168.0.21 

启动ndb_mgmd后，节点的ip显示不同：

root@ndb-mgmd:~# ndb_mgmd --config-file=/var/lib/mysql-cluster/config.ini
MySQL Cluster Management Server mysql-5.7.18 ndb-7.6.3
root@ndb-mgmd:~# ndb_mgm
-- NDB Cluster -- Management Client --
ndb_mgm> show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)] 2 node(s)
id=2 (not connected, accepting connect from 192.168.0.21)
id=3 (not connected, accepting connect from 192.168.0.22)

[ndb_mgmd(MGM)] 1 node(s)
id=1    @192.168.0.30  (mysql-5.7.18 ndb-7.6.3)

[mysqld(API)]   2 node(s)
id=4 (not connected, accepting connect from 192.168.0.21)
id=5 (not connected, accepting connect from 192.168.0.22)

"192.168.0.22“从何而来？

Answer 1

我已经搞清楚了。"--config-dir“也应该在ndb_mgmd cmdlet中使用。所以，完整的字符串是

-配置-dir=/var/lib/mysql-群集--config-file=/var/lib/mysql-cluster/config.ini