Tag Archives: mysql ndb cluster

Install a MySQL NDB Cluster using CentOS 6.2 with 2 MGMs/MySQL servers and 2 NDB nodes

I wrote a post few weeks back that my MySQL NDB cluster was already running. This is a follow-up post on how I did it.

Before I dug in, I read some articles first on the best practices for MySQL Cluster installations. One of the sources that I’ve read is this quite helpful presentation.

The plan was to setup the cluster with 6 components:

  • 2 Management nodes
  • 2 MySQL nodes
  • 2 NDB nodes

Based on the best practices, I only need 4 servers to accomplish this setup. With these tips in mind, this is the plan that I came up with:

  • 2 VMs (2 CPUs, 4GB RAM, 20GB drives ) – will serve as MGM nodes and MySQL servers
  • 2 Supermicro 1Us (4-core, 8GB RAM, RAID 5 of 4 140GB 10k rpm SAS) – will serve as NDB nodes
  • all servers will be installed with a minimal installation of CentOS 6.2
The servers will use these IP configuration
  • mm0 – 192.168.1.162 (MGM + MySQL)
  • mm1 – 192.168.1.211 (MGM + MySQL)
  • lbindb1 – 192.168.1.164 (NDB node)
  • lbindb2 – 192.168.1.163 (NDB node)

That’s the plan, now to execute…

I downloaded the binary packages from this mirror. If you want a different mirror, you can choose from the main download page. I only need these two:

To install the packages, I ran these commands in the respective servers

    mm0> rpm -Uhv --force MySQL-Cluster-server-gpl-7.2.5-1.el6.x86_64.rpm
    mm0> mkdir /var/lib/mysql-cluster
    mm1> rpm -Uhv --force MySQL-Cluster-server-gpl-7.2.5-1.el6.x86_64.rpm
    mm1> mkdir /var/lib/mysql-cluster
    lbindb1> rpm -Uhv --force MySQL-Cluster-server-gpl-7.2.5-1.el6.x86_64.rpm
    lbindb1> mkdir -p /var/lib/mysql-cluster/data
    lbindb2> rpm -Uhv --force MySQL-Cluster-server-gpl-7.2.5-1.el6.x86_64.rpm
    lbindb2> mkdir -p /var/lib/mysql-cluster/data

The mkdir commands will make sense in a bit…

My cluster uses these two configuration files:

  • /etc/my.cnf  – used in the NDB nodes and MySQL servers (both mm[01] and lbindb[01])
  • /var/lib/mysql-cluster/config.ini – used in the MGM nodes only (mm[01])

Contents of /etc/my.cnf:

[mysqld]
# Options for mysqld process:
ndbcluster # run NDB storage engine
ndb-connectstring=192.168.1.162,192.168.1.211 # location of management server

[mysql_cluster]
# Options for ndbd process:
ndb-connectstring=192.168.1.162,192.168.1.211 # location of management server

Contents of /var/lib/mysql-cluster/config.ini:

[ndbd default]
# Options affecting ndbd processes on all data nodes:
NoOfReplicas=2 # Setting this to 1 for now, 3 ndb nodes
DataMemory=1024M # How much memory to allocate for data storage
IndexMemory=512M
DiskPageBufferMemory=1048M
SharedGlobalMemory=384M
MaxNoOfExecutionThreads=4
RedoBuffer=32M
FragmentLogFileSize=256M
NoOfFragmentLogFiles=6

[ndb_mgmd]
# Management process options:
NodeId=1
HostName=192.168.1.162 # Hostname or IP address of MGM node
DataDir=/var/lib/mysql-cluster # Directory for MGM node log files

[ndb_mgmd]
# Management process options:
NodeId=2
HostName=192.168.1.211 # Hostname or IP address of MGM node
DataDir=/var/lib/mysql-cluster # Directory for MGM node log files

[ndbd]
# lbindb1
HostName=192.168.1.164 # Hostname or IP address
DataDir=/var/lib/mysql-cluster/data # Directory for this data node's data files

[ndbd]
# lbindb2
HostName=192.168.1.163 # Hostname or IP address
DataDir=/var/lib/mysql-cluster/data # Directory for this data node's data files

# SQL nodes
[mysqld]
HostName=192.168.1.162

[mysqld]
HostName=192.168.1.211

Once the configuration files are in place, I started the cluster with these commands (NOTE: Make sure that the firewall was properly configured first):

mm0> ndb_mgmd --ndb-nodeid=1 -f /var/lib/mysql-cluster/config.ini
mm0> service mysql start
mm1> ndb_mgmd --ndb-nodeid=2 -f /var/lib/mysql-cluster/config.ini
mm1> service mysql start
lbindb1> ndbmtd
lbindb2> ndbmtd

To verify if my cluster is really running, I logged-in into one of the MGM nodes and ran ndb_mgm like this:

I was able to set it this up a few weeks back. Unfortunately, I haven’t had the chance to really test it with our ETL scripts… I was occupied with other responsibilities…

Thinking about it now, I may have to scrap the whole cluster and install a MySQL with InnoDB + lots of RAM! hmmm… Maybe I’ll benchmark it first…

Oh well… 🙂

References:

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OK.. my MySQL NDB Cluster is up… now what?

I’ve been working on how to deploy our cluster for the past 2 days already. It’s nice to see that it’s running now given that I’ve been reading the MySQL manual for 2 days now…

 

 

I’ll create a detailed post on how I did it when I have more time.

Here are my preliminary notes so far:

  • only 2 files are needed, MySQL-Cluster-client-gpl-7.2.5-1.el6.x86_64.rpm & MySQL-Cluster-server-gpl-7.2.5-1.el6.x86_64.rpm
  • --force is required to install the server package in CentOS 6.2
  • make sure that IPs are static and firewalls are setup
  • total ndb nodes must be multiples of NoOfReplicas (1 or 2)
  • if mgm > 1, all mgms must be up first before you can issue commands (use –nowait-nodes to override)
  • for ndb nodes, ensure that the DataDir exists

I’m just savoring the fruits of my labor… for this is only the beginning… *sigh*