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rs-mysql cookbook

Release Build Status

Provides recipes for managing a MySQL server with RightScale, including:

  • Automatic tuning based on available system memory and server usage type
  • High availability with master/slave replication including failover
  • Database storage with cloud volumes including backup and restore

Github Repository: https://github.com/rightscale-cookbooks/rs-mysql

Requirements

See the Berksfile and metadata.rb for up to date dependency information.

Usage

To setup a standalone MySQL server, place the rs-mysql::default recipe in the runlist.

Creating a new volume

To create a new volume and move the MySQL database to it, run the rs-mysql::volume recipe with the following attributes set:

  • node['rs-mysql']['device']['nickname'] - the nickname of the volume
  • node['rs-mysql']['device']['volume_size'] - the size of the volume to create
  • node['rs-mysql']['device']['filesystem'] - the filesystem to use on the volume
  • node['rs-mysql']['device']['mount_point'] - the location to mount the volume

This will create a new volume, attach it to the server, format it with the filesystem specified, mount it on the location specified, and move the MySQL database to it.

Provisioned IOPS on EC2

To create a volume with IOPS on EC2, set the following attribute before running the rs-mysql::volume recipe:

  • node['rs-mysql']['device']['iops'] - the value of IOPS to use

Creating a logical volume with striping

To create a logical volume with striping using LVM and move the MySQL database to it, run the rs-mysql::stripe recipe with the following attributes set:

  • node['rs-mysql']['device']['nickname'] - the nickname to use as prefix for the logical volume
  • node['rs-mysql']['device']['count'] - number of volumes to create in the logical volume
  • node['rs-mysql']['device']['volume_size'] - the total size of the logical volume
  • node['rs-mysql']['device']['filesystem'] - the filesystem to use on the logical volume
  • node['rs-mysql']['device']['mount_point'] - the location to mount the logical volume

This will create the number of volumes specified in node['rs-mysql']['device']['count']. Each volume created will have a nickname of "#{nickname}_#{device_number}". The size for each volume is calculated by the following formula:

(total_size.to_f / device_count.to_f).ceil

# For example, total size = 10, stripe count = 3
(10.0 / 3.0).ceil
# => 4.0

This will create a volume group with the name "#{nickname}-vg" and a logical volume in it with the name "#{nickname}-lv", format it with the filesystem specified, mount it on the location specified, and move the MySQL database to it.

Master/Slave replication and Failover

To setup a MySQL master/slave replication, place the rs-mysql::master recipe in the runlist for the master server and the rs-mysql::slave recipe in the runlist for the slave server. The master server should be operational before bringing up the slave server. Both the master and slave servers are tagged with required information for replication. Please refer to the rightscale_tag cookbook for more information about the tags added to database servers. When using volumes with master/slave replication, the rs-mysql::volume or rs-mysql::stripe recipe should run before the rs-mysql::master or rs-mysql::slave recipe.

To promote a slave to master in a failover situation just run the rs-mysql::master recipe on the slave that needs to be promoted. If there are other slaves in the deployment, the rs-mysql::slave recipe should be re-run on those servers as well. If the old master is still working, it can be demoted to a slave by running the rs-mysql::slave recipe as well.

Backing up volume(s) & Cleaning up backups

To create a backup of all volumes attached to the server, run the rs-mysql::backup recipe with the following attributes set:

  • node['rs-mysql']['backup']['lineage'] - the lineage to be used for the backup

The backup process will create a snapshot of all volumes attached to the server (except the boot disk if there is one). During the backup process, the MySQL database will be read-only for a period to ensure a consistent backup, so it is recommended that it only runs on a slave MySQL database server. The backup recipe also handles the cleanup of old volume snapshots and accepts the following attributes:

  • node['rs-mysql']['backup']['keep']['keep_last'] - number of last backups to keep from deleting
  • node['rs-mysql']['backup']['keep']['dailies'] - number of daily backups to keep
  • node['rs-mysql']['backup']['keep']['weeklies'] - number of weekly backups to keep
  • node['rs-mysql']['backup']['keep']['monthlies'] - number of monthly backups to keep
  • node['rs-mysql']['backup']['keep']['yearlies'] - number of yearly backups to keep

This will cleanup the old snapshots on the cloud based on the criteria specified.

Restoring a volume from a backup

To restore a volume from backup, run the rs-mysql::volume recipe with the same set of attributes mentioned in the previous section along with the following attribute:

  • node['rs-mysql']['restore']['lineage'] - the lineage to restore the backup from

This will restore the volume from the backup instead of creating a new one. By default, the backup with the latest timestamp will be restored. To restore backup from a specific timestamp, set the following attribute:

  • node['rs-mysql']['restore']['timestamp'] - the timestamp of the backup to restore from (in seconds since UNIX epoch)

Restoring a logical volume composed of multiple volumes from a backup

To restore a logical volume composed of multiple volumes from a backup, run the rs-mysql::stripe recipe with the same set of attributes mentioned in the previous section along with the following attribute:

  • node['rs-mysql']['restore']['lineage'] - the lineage to restore the backup from

This will restore multiple volumes from the backup matching the lineage. By default, the backup with the latest timestamp will be restored. To restore a backup from a specific timestamp, set the following attribute:

  • node['rs-mysql']['restore']['timestamp'] - the timestamp of the backup to restore from (in seconds since UNIX epoch)

Scheduling automated backups of volume(s)

To schedule automated backups, run the rs-mysql::schedule recipe with the following attributes set:

  • node['rs-mysql']['schedule']['enable'] - to enable/disable automated backups
  • node['rs-mysql']['schedule']['hour'] - the hour to take the backup on (should use crontab syntax)
  • node['rs-mysql']['schedule']['minute'] - the minute to take the backup on (should use crontab syntax)
  • node['rs-mysql']['backup']['lineage'] - the lineage name to be used for the backup

This will create a crontab entry to run the rs-mysql::backup recipe periodically at the given minute and hour. To disable the automated backups, simply set node['rs-mysql']['schedule']['enable'] to false and rerun the rs-mysql::schedule recipe and this will remove the crontab entry.

Deleting volume(s)

This operation should be part of the decommission bundle in a RightScale ServerTemplate where the volumes attached to the server are detached and deleted from the cloud but this can also be used as an operational recipe. This recipe will do nothing in the following conditions:

  • when the server enters a stop state
  • when the server reboots

This recipe also has a safety attribute node['rs-mysql']['device']['destroy_on_decommission']. This attribute will be set to false by default and should be overridden and set to true in order for the devices to be detached and deleted. If an LVM is found (created using rs-mysql::stripe), the LVM will be conditionally removed before detaching the volume.

Attributes

  • node['rs-mysql']['server_usage'] - The server usage type. It should be either 'dedicated' or 'shared'. Default is 'dedicated'.
  • node['rs-mysql']['server_root_password'] - The root password for MySQL server.
  • node['rs-mysql']['server_repl_password'] - The replication password for MySQL server.
  • node['rs-mysql']['application_username'] - The database username to be created for the application.
  • node['rs-mysql']['application_password'] - The database password to be used for the application user.
  • node['rs-mysql']['application_user_privileges'] - The application user's privileges.
  • node['rs-mysql']['application_database_name'] - The name of the application database.
  • node['rs-mysql']['import']['repository'] - Repository location containing the database dump file to import.
  • node['rs-mysql']['import']['private_key'] - The private key to access the repository via SSH.
  • node['rs-mysql']['import']['revision'] - The revision of the database dump file to import.
  • node['rs-mysql']['import']['dump_file'] - Filename of the database dump file to import.
  • node['rs-mysql']['dns']['master_fqdn'] - The fully qualified domain name of the master database.
  • node['rs-mysql']['dns']['user_key'] - The user key for the DNS provider to access/modify DNS records.
  • node['rs-mysql']['dns']['secret_key']- The secret key for the DNS provider to access/modify DNS records.
  • node['rs-mysql']['device']['nickname'] - The nickname of the device or the logical volume comprising multiple devices. Default is 'data_storage'.
  • node['rs-mysql']['device']['mount_point'] - The mount point for the device. Default is '/mnt/storage'.
  • node['rs-mysql']['device']['volume_size'] - The size (in gigabytes) of the volume to be created. If multiple devices are used, this will be the total size of the logical volume. Default is 10.
  • node['rs-mysql']['device']['count'] - The number of devices to be created for the logical volume. Default is 2.
  • node['rs-mysql']['device']['iops'] - The IOPS value to be used for EC2 Provisioned IOPS. This attribute should only be used with Amazon EC2. Default is nil.
  • node['rs-mysql']['device']['filesystem'] - The filesystem to be used on the device. Default is 'ext4'.
  • node['rs-mysql']['device']['detach_timeout'] - Amount of time (in seconds) to wait for a volume to detach at decommission. Default is 300 (5 minutes).
  • node['rs-mysql']['device']['destroy_on_decommission'] - Whether to destroy the device during the decommission of the server. Default is false.
  • node['rs-mysql']['device']['mkfs_options'] - Additional mkfs options for formatting the device. Default is '-F' which is required to avoid warnings about formatting the whole device.
  • node['rs-mysql']['device']['stripe_size'] - The stripe size to use on LVM. Default is 512.
  • node['rs-mysql']['backup']['lineage'] - The backup lineage. Default is nil.
  • node['rs-mysql']['backup']['keep']['keep_last'] - Maximum snapshots to keep. Default is 60.
  • node['rs-mysql']['backup']['keep']['dailies'] - Number of daily backups to keep. Default is 14.
  • node['rs-mysql']['backup']['keep']['weeklies'] - Number of weekly backups to keep. Default is 6.
  • node['rs-mysql']['backup']['keep']['monthlies'] - Number of monthly backups to keep. Default is 12.
  • node['rs-mysql']['backup']['keep']['yearlies'] - Number of yearly backups to keep. Default is 2.
  • node['rs-mysql']['restore']['lineage'] - The name of the lineage to restore the backups from. Default is nil.
  • node['rs-mysql']['restore']['timestamp'] - The timestamp to restore backup taken on or before the timestamp in the same lineage. Default is nil.
  • node['rs-mysql']['schedule']['enable'] - Enable/disable automated backups. Default is false.
  • node['rs-mysql']['schedule']['hour'] - The backup schedule hour. Default is nil.
  • node['rs-mysql']['schedule']['minute'] - The backup schedule minute. Default is nil.
  • node['rightscale']['decom_reason'] - Set from RL10 Shutdown Reason Rightscript to determine how to handle rs-mysql::decommission behavior

Recipes

rs-mysql::default

Installs the MySQL server and tunes the attributes used in the my.cnf based on the available system memory and the server usage type. If the server usage type is 'dedicated', all resources in the system are dedicated to the MySQL server and if the usage type is 'shared', only half of the resources are used for the MySQL server. This 'shared' usage will be used in building a LAMP stack where the same system is used to run both the MySQL server and the PHP application server. This recipe also tags the server as a standalone MySQL server.

rs-mysql::volume

Creates a new volume from scratch or from an existing backup based on the value provided in the node['rs-mysql']['restore']['lineage'] attribute. If this attribute is set, the volume will be restored from a backup matching this lineage otherwise a new volume will be created from scratch. This recipe will also format the volume using the filesystem specified in node['rs-mysql']['device']['filesystem'], mount the volume on the location specified in node['rs-mysql']['device']['mount_point'], and move the MySQL database directory to the volume.

rs-mysql::stripe

Creates a new logical volume composed of volumes from scratch or from an existing backup based on the value provided in the node['rs-mysql']['restore']['lineage'] attribute. If this attribute is set, the volumes will be restored from a backup matching this lineage otherwise a new logical volume composed of volumes will be created from scratch. This recipe will create a striped logical volume using LVM on the volumes and format the logical volume using the filesystem specified in node['rs-mysql']['device']['filesystem']. This will also mount the volume on the location specified in node['rs-mysql']['device']['mount_point'] and move the MySQL database directory to the logical volume.

rs-mysql::master

This recipe sets up the database to act as the master. It makes sure the database is not read only by overriding the mysql/tunable/read_only to false and includes the rs-mysql::default recipe which installs MySQL and performs the configuration. The master database specific tags are added to the server and the master is reset. The master database can be provided with a fully qualified domain name (FQDN) by setting the node['rs-mysql']['dns']['master_fqdn'] attribute. The DNS provider credentials (node['rs-mysql']['dns']['user_key'] and node['rs-mysql']['dns']['secret_key']) must also be set to create/update the DNS records in the DNS provider.

rs-mysql::slave

This recipe modifies the MySQL server to be read only and includes the rs-mysql::default recipe which installs MySQL, performs configuration, and tags the server as a slave server. It obtains the information about the master database with the help of the find_database_servers helper method provided by the rightscale_tag cookbook and changes the master host of the slave to the latest master available in the deployment. If this recipe is run after rs-mysql::volume or rs-mysql::stripe and a backup was restored, this recipe will use information from the backup to assist with catching up with the master MySQL database.

rs-mysql::backup

Takes a backup of all volumes attached to the server (except boot disks if there are any) with the lineage specified in the node['rs-mysql']['backup']['lineage'] attribute. During the backup process, the MySQL database will be read-only and the filesystem will be frozen. The filesystem will be unfrozen and the MySQL database will no longer be read-only after the backup even if the backup process fails with the help of a chef exception handler. This recipe will also clean up the volume snapshots based on the criteria specified in the rs-mysql/backup/keep/* attributes.

rs-mysql::schedule

Adds or removes the crontab entry for taking backups periodically at the minute and hour provided via node['rs-mysql']['schedule']['minute'] and node['rs-mysql']['schedule']['hour'] attributes. The recipe uses the node['rs-mysql']['schedule']['enable'] attribute to determine whether to add or remove the crontab entry.

rs-mysql::decommission

If the node['rs-mysql']['device']['destroy_on_decommission'] attribute is set to true, this recipe moves the MySQL database back to the root volume, drops the database specified by node['rs-mysql']['application_database_name'] if it is specified, and detaches and deletes the volumes attached to the server. This operation will be skipped if the server is entering the stop state or rebooting.

rs-mysql::dump_import

Retrieves a dump file from a Git repository and imports it to the database server. The Git repository is specified by node['rs-mysql']['import']['repository'] with revision/branch specified by node['rs-mysql']['import']['revision']. The dump file in the repository is specified by node['rs-mysql']['import']['dump_file']. The private key attribute, node['rs-mysql']['import']['private_key'], must be set if retrieving from a private repository.

rs-mysql::collectd

Installs the collectd plugins for MySQL.

Author

Author:: RightScale, Inc. ([email protected])