Oracle Linux/MySQL
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==dependencies== | ==dependencies== | ||
| − | Again, same as with the management node configuration, | + | Again, same as with the management node configuration, there are some packages you may need to install, but are not required. More info can be [[Oracle_Linux/Quick_Reference#Common_packages_to_install_on_fresh_.28minimal.29_install|found here]]. |
| + | <nowiki>~$ sudo yum install -y wget telnet vim net-tools bind-utils</nowiki> | ||
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| + | While most of the guides I found perform installation directly using the RPM packages, I prefer to install packages from a repository whenever available. [https://dev.mysql.com/downloads/repo/yum/ MySQL provides a YUM repository]. | ||
<nowiki>~$ wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm | <nowiki>~$ wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm | ||
~$ sudo yum localinstall -y mysql80-community-release-el7-3.noarch.rpm</nowiki> | ~$ sudo yum localinstall -y mysql80-community-release-el7-3.noarch.rpm</nowiki> | ||
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Do a quick <code>check-update</code> to refresh the package list cache | Do a quick <code>check-update</code> to refresh the package list cache | ||
<nowiki>~$ sudo yum check-update</nowiki> | <nowiki>~$ sudo yum check-update</nowiki> | ||
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| − | |||
==package installation== | ==package installation== | ||
Revision as of 16:59, 4 March 2020
Contents |
Simple Cluster configuration
Will consist of 5 components:
- Management Node
- holds the configuration for MySQL Cluster in a file called config.ini. It also writes a cluster log, and takes part in arbitration to prevent split-brain or network partitioning.
- (2) Data Nodes
- stores the data and the tables. The data nodes takes cares of managing the transactions, recovery, etc
- (2) SQL Nodes
- the most common way to read/write data to the Data Nodes is by using the MySQL Server (aka SQL Node)
Management Node Configuration
dependencies
While most of the guides I found perform installation directly using the RPM packages, I prefer to install packages from a repository whenever available. MySQL provides a YUM repository.
~$ wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm ~$ sudo yum localinstall -y mysql80-community-release-el7-3.noarch.rpm
Verify you can see the new cluster packages and search them.
~$ yum repolist all | grep mysql ~$ yum --enablerepo=mysql-cluster-8.0-community search mysql
Enable the cluster repo by setting enabled=1
~$ sudo vim /etc/yum.repos.d/mysql-community.repo ... [mysql-cluster-8.0-community] name=MySQL Cluster 8.0 Community baseurl=http://repo.mysql.com/yum/mysql-cluster-8.0-community/el/7/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Do a quick check-update to refresh the package list cache
~$ sudo yum check-update
We also need to open a port and make sure our networking interface is setup correctly. In my environment, servers communicate with each other through a virtual 10GB network rather than traversing the physical 1GB network.
~$ sudo firewall-cmd --permanent --zone=internal --change-interface=eth1 ~$ sudo firewall-cmd --zone=internal --permanent --add-port=1186/tcp
Lastly, there are some other packages you may need to install, but are not required. More info can be found here.
~$ sudo yum install -y telnet vim net-tools bind-utils
package installation
There are a couple of dependencies we need to install.
~$ sudo yum install -y epel-release && sudo yum install -y perl-Class-MethodMaker
Install the packages
~$ sudo yum install -y mysql-cluster-community-management-server mysql-cluster-community-client mysql-cluster-community-libs
configure management node cluster
Now we can setup a basic configuration file for the cluster.
~$ sudo mkdir -p /var/lib/mysql-cluster ~$ sudo vim /var/lib/mysql-cluster/config.ini ... [ndb_mgmd default] # Directory for MGM node log files DataDir=/var/lib/mysql-cluster [ndb_mgmd] #Management Node db1 HostName=rncv-sqlmgmt01.virtual.local [ndbd default] NoOfReplicas=2 # Number of replicas DataMemory=256M # Memory allocate for data storage IndexMemory=128M # Memory allocate for index storage #Directory for Data Node DataDir=/var/lib/mysql-cluster [ndbd] #Data Node db2 HostName=rncv-sqldata01.virtual.local [ndbd] #Data Node db3 HostName=rncv-sqldata02.virtual.local [mysqld] #SQL Node db4 HostName=rncv-sql01.virtual.local [mysqld] #SQL Node db5 HostName=rncv-sql02.virtual.local
Now we can implement the config
~$ sudo ndb_mgmd --config-file=/var/lib/mysql-cluster/config.ini MySQL Cluster Management Server mysql-8.0.19 ndb-8.0.19 2020-02-24 17:54:57 [MgmtSrvr] INFO -- The default config directory '/usr/mysql-cluster' does not exist. Trying to create it... 2020-02-24 17:54:57 [MgmtSrvr] INFO -- Sucessfully created config directory 2020-02-24 17:54:57 [MgmtSrvr] WARNING -- at line 12: [DB] IndexMemory is deprecated, will use Number bytes on each ndbd(DB) node allocated for storing indexes instead
And finally we can view the implementation:
~$ 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 rncv-sqldata01.virtual.local) id=3 (not connected, accepting connect from rncv-sqldata02.virtual.local) [ndb_mgmd(MGM)] 1 node(s) id=1 @10.10.0.40 (mysql-8.0.19 ndb-8.0.19) [mysqld(API)] 2 node(s) id=4 (not connected, accepting connect from rncv-sql01.virtual.local) id=5 (not connected, accepting connect from rncv-sql02.virtual.local) ndb_mgm> quit
Data Node Configuration
The data node configuration is very similar to the Management node configuration.
dependencies
Again, same as with the management node configuration, there are some packages you may need to install, but are not required. More info can be found here.
~$ sudo yum install -y wget telnet vim net-tools bind-utils
While most of the guides I found perform installation directly using the RPM packages, I prefer to install packages from a repository whenever available. MySQL provides a YUM repository.
~$ wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm ~$ sudo yum localinstall -y mysql80-community-release-el7-3.noarch.rpm
Verify you can see the new cluster packages and search them.
~$ yum repolist all | grep mysql ~$ yum --enablerepo=mysql-cluster-8.0-community search mysql
Enable the cluster repo by setting enabled=1
~$ sudo vim /etc/yum.repos.d/mysql-community.repo ... [mysql-cluster-8.0-community] name=MySQL Cluster 8.0 Community baseurl=http://repo.mysql.com/yum/mysql-cluster-8.0-community/el/7/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Do a quick check-update to refresh the package list cache
~$ sudo yum check-update
package installation
There are a couple of dependencies we need to install.
~$ sudo yum install -y epel-release && sudo yum install -y perl-Class-MethodMaker perl-Data-Dumper
Install the packages
~$ sudo yum install -y mysql-cluster-community-data-node ~$ sudo yum install -y mysql-cluster-community-management-server mysql-cluster-community-client mysql-cluster-community-libs
configure data node
We now need to tell the data node where to find the sql management node.
~$ sudo vim /etc/my.cnf ... [mysqld] ndbcluster ndb-connectstring=rncv-sqlmgmt01.virtual.local # IP address of Management Node [mysql_cluster] ndb-connectstring=rncv-sqlmgmt01.virtual.local # IP address of Management Node
Create a folder for the configuration files and data.
~$ sudo mkdir -p /var/lib/mysql-cluster
I had an issue starting the ndbd client because of the folder permissions set on the folder above. Since ndbd runs as whatever user it is launched from, make sure that user has read, write, and execute permissions to the folder.
start data node
Now we can start the data node and confirm it's connected.
~$ ndbd 2020-03-04 13:35:04 [ndbd] INFO -- Angel connected to 'rncv-sqlmgmt01.virtual.local:1186' 2020-03-04 13:35:04 [ndbd] INFO -- Angel allocated nodeid: 2
From the management node you can also confirm this:
#management_node~$ 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 @10.10.0.41 (mysql-8.0.19 ndb-8.0.19, starting, Nodegroup: 0) id=3 (not connected, accepting connect from rncv-sqldata02.virtual.local) [ndb_mgmd(MGM)] 1 node(s) id=1 @10.10.0.40 (mysql-8.0.19 ndb-8.0.19) [mysqld(API)] 2 node(s) id=4 (not connected, accepting connect from rncv-sql01.virtual.local) id=5 (not connected, accepting connect from rncv-sql02.virtual.local)
If you have a 2nd data node, repeat this process
