.. meta:: :title: Training Video Exercises |---| Installing Galera Cluster with MySQL :description: :language: en-US :keywords: :copyright: Codership Oy, 2014 - 2021. All Rights Reserved. .. container:: left-margin .. container:: left-margin-top :doc:`The Library <../../index>` .. container:: left-margin-content - :doc:`Documentation <../../documentation/index>` - :doc:`Knowledge Base <../../kb/index>` - :doc:`Training <../index>` .. cssclass:: sub-links - :doc:`Training Courses <../courses/index>` .. cssclass:: here - :doc:`Training Videos <./index>` .. cssclass:: sub-links - :doc:`Tutorial Articles <../tutorials/index>` - :doc:`FAQ <../../faq>` - :ref:`search` Related Documents - :doc:`Firewall Settings <../../documentation/firewall-settings>` - :doc:`firewalld <../../documentation/firewalld>` - :doc:`Installing Galera <../../documentation/install>` - :doc:`Node Provisioning <../../documentation/node-provisioning>` - :doc:`SELinux <../../documentation/selinux>` - :doc:`State Transfer <../../documentation/state-transfer>` - :doc:`wsrep Options <../../documentation/mysql-wsrep-options>` Other Resources - `Galera Repository `_ - `Configure Repo File <../../documentation/install-mysql.html#mysql-yum-repo>`_ .. container:: top-links - `Home `_ - :doc:`Docs <../../documentation/index>` - :doc:`KB <../../kb/index>` .. cssclass:: here nav-wider - :doc:`Training <../index>` - :doc:`FAQ <../../faq>` .. role:: raw-html(raw) :format: html .. cssclass:: library-article training-exercises .. _`exercises-galera-mysql-installing`: ========================== Training Video Exercises ========================== --------------------------------------- Installing Galera Cluster with MySQL --------------------------------------- .. container:: video-abstract list-col2-3 These exercises are part of the training video, *Installing Galera Cluster with MySQL*. They correspond to what was taught, and should be done after viewing each section, unless otherwise noted. Before starting these exercises, make sure you have all of the requirements and preparations in place. .. container:: list-col1-3 .. rst-class:: training-video-resources .. rubric:: Requirements & Preparation .. rst-class:: training-video-resources - Test Servers: 3 - Operating System: Linux - Software: Don’t install MySQL or Galera Cluster in preparation. .. rst-class:: training-video-resources .. rubric:: Student Materials .. rst-class:: training-video-resources - :doc:`Example Configuration ` - `Company Database `_ .. container:: banner .. rst-class:: section-heading .. rubric:: Exercises Before starting each exercise, read it fully and carefully. The headings for each set of exercises corresponds to the section with the same name in training video. Make notes for yourself as you go along, for when you have to do these tasks for your work. .. rst-class:: sub-heading .. rubric:: Installing Software on Nodes Do these exercises after viewing the first two sections of the training video: *Galera Cluster Overview*, and *Installing Software on Nodes*. Don’t configure the nodes until the next section. .. rst-class:: list-exercises 1. Use a web browser to go to Codership’s web site (see link in margin) to get the URLs for the latest wsrep-MySQL and the Galera Cluster packages. Use a text editor to create a repository file on each node and include the URLs you copied. See the margin for a link to the Codership’s documentation page which shows how to construct a repository file with the URLs. 2. Install MySQL and Galera on each node. When finished, start ``mysqld`` on each, then ``grep`` the MySQL log to get root’s temporary passwords. Run ``mysql_secure_install`` on each and change the root password, as well as respond to the other questions it asks. Then try logging into MySQL with the mysql client as root with the new password. Exit MySQL and shutdown ``mysqld``. .. rst-class:: sub-heading .. rubric:: Configuring Nodes & Opening Ports Do these exercises after viewing the section with these same two titles. MySQL should be down on each node; don’t start ``mysqld`` again until the next set of exercises. .. rst-class:: list-exercises 3. Edit the MySQL configuration file to include settings needed for Galera Cluster. There’s a link in the Student Materials section at the top of this page, for an example configuration file. Don’t start ``mysqld`` yet. Configure each node before proceeding to the next exercise. 4. Configure either SELinux or Firewalld or both to open the following ports: TCP 22, TCP 3306. TCP 4444, TCP & UDP 4567, and TCP 4568. If you intend to use only SELinux or only Firewalld, disable the one not used. .. rst-class:: sub-heading .. rubric:: Starting Galera This is the core of the training video. You may encounter problems as you do these exercises. Don’t let it frustrate you. It’s important. So don’t stop trying until you’re able to do them. .. rst-class:: list-exercises 5. Choose a node to be the seed node |---| anyone will be fine. Start MySQL and Galera on it by using the ``mysqld_bootstrap`` script. If there are any errors, shutdown ``mysqld`` and read the full error messages, as well as look through the MySQL log for clues. Resolve any problems and keep trying until you get it started. Execute ``SHOW STATUS`` with the ``LIKE`` operator to see if Galera is running. 6. Once you have the first node running MySQL and Galera, start ``mysqld`` on one of the other nodes |---| don’t use ``mysqld_bootstrap``. If there are any errors, shutdown ``mysqld`` and resolve them until you get it started. Check the status variable ``wsrep_cluster_size``. It should have a value of 2. 7. Download the dump file containing the ``company`` database (see link above under Student Materials) onto the first node. Since it was made with ``mysqldump``, use the ``mysql`` client to load the data. When it’s finished, check the second node to see if it replicated the data. 8. Start ``mysqld`` on the third node. After it has successfully joined the cluster, look to see if it has replicated the ``company`` database. Enter the ``CREATE DATABASE`` statement to create a database without tables. Check that the other nodes replicated it. 9. Shut down all of the nodes and restart them, using ``mysqld_bootstrap`` to start only the first node, which should be the last one that was shutdown. If you have problems, check the ``grastate.dat`` file in the data directory to ensure the ``safe_to_bootstrap`` parameter is set to 1. .. note:: If you struggled at any point in doing these exercises, especially in getting the Galera nodes started, you might want to do them again. Start with fresh installations of the servers, without MySQL or Galera Cluster. If you use the same servers, before doing the exercises again, uninstall MySQL and Galera, and delete MySQL’s data directory. Do the exercises multiple times until you’re able to install, configure, and start a Galera cluster without any problems. .. container:: bottom-links Related Documents - :doc:`Firewall Settings <../../documentation/firewall-settings>` - :doc:`firewalld <../../documentation/firewalld>` - :doc:`Installing Galera <../../documentation/install>` - :doc:`Node Provisioning <../../documentation/node-provisioning>` - :doc:`SELinux <../../documentation/selinux>` - :doc:`State Transfer <../../documentation/state-transfer>` - :doc:`wsrep Options <../../documentation/mysql-wsrep-options>` Other Resources - `Galera Repository `_ - `Configure Repo File <../../documentation/install-mysql.html#mysql-yum-repo>`_ .. |---| unicode:: U+2014 .. EM DASH :trim: .. |br| raw:: html