Question

I have a problem with my MySQL Cluster running on AWS EC2 instances (3 data nodes and 1 management node, on t2.micro running Ubuntu latest version). I followed this tutorial (with updated version of MySQL Cluster 7.5.5) : https://stansantiago.wordpress.com/2012/01/04/installing-mysql-cluster-on-ec2/

In my.cnf file, I have the following code :

[mysqld]
ndbcluster
datadir=/opt/mysqlcluster/deploy/mysqld_data
basedir=/opt/mysqlcluster/home/mysqlc
port=3306

In config.ini file, I have this code :

[ndb_mgmd]
hostname=<private DNS of master>
datadir=/opt/mysqlcluster/deploy/ndb_data
nodeid=1

[ndbd default]
noofreplicas=3
datadir=/opt/mysqlcluster/deploy/ndb_data

[ndbd]
hostname=<private DNS of slave 1>
nodeid=3

[ndbd]
hostname=<private DNS of slave 2>
nodeid=4

[ndbd]
hostname=<private DNS of slave 3>
nodeid=5

[mysqld]
nodeid=50

Then I start the management node like this :

ndb_mgmd -f /opt/mysqlcluster/deploy/conf/config.ini --initial --configdir=/opt/mysqlcluster/deploy/conf

Everything seems fine, I have no error displayed.

However, when I try to connect a slave to the cluster, with this command :

ndbd -c <private DNS of master>:1186

it fails with this error code :

Unable to connect with connect string: nodeid=0,<private DNS of master>:1186

I tried the command ndb_mgm -e show to see what was going on :

Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)] 3 node(s)
id=3 (not connected, accepting connect from <private DNS of slave 1>)
id=4 (not connected, accepting connect from <private DNS of slave 2>)
id=5 (not connected, accepting connect from <private DNS of slave 2>)

[ndb_mgmd(MGM)] 1 node(s)
id=1    @<private IP address of master>  (mysql-5.7.17 ndb-7.5.5)

[mysqld(API)]   1 node(s)
id=50 (not connected, accepting connect from any host)

It seems that the management node started on localhost, is this why it fails ? I don't understand why I can't connect the data nodes to the cluster because the configuration files look good.

If somebody has any suggestion, it would be much appreciated. Thank you !

Answer 1

让MySQL Cluster在EC2上运行的问题是确保这一点所有虚拟机都可以通过适当的端口进行通信。

这是通过添加所有VM所属的安全组来处理的。我创建了一个名为NDB Cluster的安全组，它有规则要在以下端口上进行通信的入站和出站TCP流量： 1186（NDB管理服务器端口），3306（MySQL服务器端口），3316（额外的MySQL服务器端口），8081（MySQL集群自动安装程序端口），11860（MySQL集群数据节点端口），33060（MySQLX端口）。

我在config.ini中添加了一行到NDBD DEFAULT部分 ServerPort = 11860 这意味着所有节点都使用此连接到数据节点端口号。

所有使用此安全组的虚拟机都像魅力一样当没有设置为在所有节点之间进行通信时，事情并不起作用显然非常好。

Data nodes cannot connect to MySQL Cluster

1 个答案: