Comments on How to Install and Configure MySQL Cluster on CentOS 7

Great walk through. What will happen if management fails. Can we build redundancy  for Management node.

You can use Haproxy as load balancer between MySQL server.

HAProxy is too slow for MySQL Cluster when connected from application. Kindly suggest some configuration parameters which could help in making the performance better. 

If the management server fails the cluster will continue to work, it will however not be possible to restart a node since the management server is needed to startup the data nodes and mysql server nodes in MySQL Cluster. It is possible to have multiple management nodes. Management server also gets a lot of logging messages from other nodes which it reports in the cluster log (each node also reports log events in its own node log).

I follow your toturial,but after the mysql service start,the management node cannot connect with the sql node.

Thank you, I fogot to close the firewall.

well the best way is add a port in firewall, not close the firewall, I did and it worked.

Hi, great article...dumb question: performing an insert/update to the SQL nodes(slave nodes d4 or d5), the data is replicated guaranteed consistent across all configured slave nodes(on future reads?)

Great how to's. I have 30GB each physical memory in 2 datanodes  and SSD 200GB each . but the database size(cumulative size of multiple db's) is around 55GB can I migrate my mysql database(myisam/innodb mix tables) to ndb cluster 

Great article, my cluster is up and running now.A dumb question, to which server i need to point my code to ? I have a PHP site that will be connecting to mysql instance here, so which server i should be using in connection string? db3, db4?

Excellent

Nice article, however i have some questions here. In my environment we have almost 1.5 TB of data and going for cluster. Now we can not fit all the 1.5 TB of data in memory. I just want to know how can we configure our data nodes or cluster so that my data files can reside on disk instead of memory.

I have also gone through some of links and per them, we need to create log file group and then create data files. Could you please provide some configurations link on this.

Thanks,

Jitender

https://www.howtoforge.com/tutorial/how-to-install-and-configure-mysql-cluster-on-centos-7/

This tutorial not connecting Mysql API, I am  working with centos 7.2.

You'll need to either disable SELinux, or more properly configure it as described in this blog post:

https://blogs.oracle.com/jsmyth/entry/connection_failures_between_nodes_in

how to turn on tool to take picture that is as same as the above picture ??? i try to find solution but it is not ok.

I had followed all steps as defined above. Here i used to physical machine 4.115(Datanode1) and 4.116(Mysql node1) and install vm in each host machine 4.118(Datanode2) and 4.119(Mysql2) and one more VM in my machine 4.117(Management node).

After running ndb_mgm and show , Below is the output:

Connected to Management Server at: localhost:1186Cluster Configuration---------------------[ndbd(NDB)]     2 node(s)id=2    @192.168.4.115  (mysql-5.6.28 ndb-7.4.10, starting, Nodegroup: 0)id=3 (not connected, accepting connect from 192.168.4.116)[ndb_mgmd(MGM)] 1 node(s)id=1    @192.168.4.117  (mysql-5.6.28 ndb-7.4.10)[mysqld(API)]   2 node(s)id=4 (not connected, accepting connect from 192.168.4.116)

id=5 (not connected, accepting connect from 192.168.4.115)

And My Config file is:

[ndb_mgmd default]

# Directory for MGM node log filesDataDir=/var/lib/mysql-cluster[ndb_mgmd]#Management Node mgmHostName=192.168.4.117[ndbd default]NoOfReplicas=2      # Number of replicasDataMemory=256M     # Memory allocate for data storageIndexMemory=128M    # Memory allocate for index storage#Directory for Data NodeDataDir=/var/lib/mysql-cluster[ndbd]#Data Node node1HostName=192.168.4.115[ndbd]#Data Node node3HostName=192.168.4.118[mysqld]#SQL Node node2HostName=192.168.4.116[mysqld]#SQL Node node5HostName=192.168.4.119

From One Data node i am getting success message as:

2016-11-23 03:25:20 [ndbd] INFO     -- Angel connected to '192.168.4.117:1186'2016-11-23 03:25:20 [ndbd] INFO     -- Angel allocated nodeid: 2

But from other one:

ndbd2016-11-23 03:41:33 [ndbd] INFO     -- Angel connected to '192.168.4.117:1186'2016-11-23 03:41:33 [ndbd] ERROR    -- Failed to allocate nodeid, error: 'Error: Could not alloc node id at 192.168.4.117 port 1186: Connection done from wrong host ip 192.168.4.118.'

Can you please help me out , I am not able to figure it out.

Thanks for the great post. I was able to create the cluster very quickly in no time.

However, I see 2 data nodes are in starting status. I tried bringing them up ndbd command by ssh'ing into those nodes.

And the status of sql nodes are (not connected, accepting connect from node4 & node5)

I researched about this error "Failed to allocate nodeid, error: 'Error: Could not alloc node id" and could not find anything useful.

Any help on this would be much appreciated.

Thanks a lot for this beautiful document. But still having issue in restoring a backup file in this cluster environment. SO please help me. backup file size is around 2GB.

Also Please share the document to configure MySQL Cluster GPL 7.5.

Thanks a lot again.

is mysql cluster gpl comes with the free licence?

hello, 

the cluster works well, but i found out that my users created on my SQL Node 1 does't replicate into the SQL Node 2,

i didn't found why 

regards 

How did you add that GUI interface to this installation?

Please help Thank you!!

Hi,

I am getting error when starting mysql server.

I had same my.cnf file as you have.

Starting MySQL. ERROR! The server quit without updating PID file (/var/lib/mysql/gateway2.rev.com.pid).

What is the password for root in step 5.

"Type your old mysql password and then type the new one, press enter to confirm all."

please what if i want to use two ndb_mgmd (MGM) how do i do?

I had followed this article. In the Data node, I got - Angel connected. MySQL was also started. But in the management node, it is showing as not connected.