Introduction to Alibaba Auto Scaling
Alibaba Auto Scaling automatically creates and releases ECS instances based on pre-defined rules in order to scale services to match demand. Furthermore, it can configure server load balancer and relational database service white lists, without any manual intervention.
In this course, you will learn about the Alibaba Auto Scaling service and how it operates. You will learn about the core concepts of the service, scaling groups, scaling configurations, and scaling rules (manual and automatic). For each section of the course, there are guided demonstrations from the Alibaba Cloud platform that you can follow along with, giving you the practical experience necessary to set up auto scaling on your own environment.
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- Understand the core concepts and components of Alibaba Auto Scaling
- Learn how to create, modify, enable, disable, and delete a scaling group
- Learn how to create, modify and delete the scaling configuration that provides the virtual servers in the scaling group
- Understand the different types of scaling rules that are available
- Learn how to use manual and automatic scaling operations
This course is intended for anyone who wants to learn how to set up auto scaling in their Alibaba Cloud environments.
To get the most out of this course, you should already have a basic knowledge of Alibaba Cloud or another cloud vendor.
Welcome to session three, Scaling Groups. In this session, we will look at creating, modifying, enabling, disabling, and finally deleting the scaling group. Correct scaling group is pretty straightforward and can be done from the Auto Scaling homepage within the console by clicking the Create Scaling Group button. This will open the quick create template list or from the scaling group list page by clicking the Create button.
Whichever method is used the main configuration points for a scale group are: Give the scale group a name and choose the configuration source. Optionally configure tags, configure the instance removal policy enter the minimum and maximum number of instances allowed in the group. Configure the default cool down time, select the scaling policy and reclaim mode, select the network and V-Switches that the ECS instances will be provisioned in and optionally select any server load balancers and RDS instances that we want to associate with the scale group.
It's worth noting that a scale group can exist even if it doesn't have a load balancer or RDS instance attached. Once created, the scale group will be provisioned in a disabled state until a scale configuration is added. Querying and modifying scale groups. We also need to be able to query and modify a scale group. So scaling groups have three life cycle states: Active, inactive, and deleting.
\When you're modifying scaling groups the following cannot be modified: The region, server load balancer settings, RDS database settings. But the following can be modified: Tags, instance removal policy, suspended processes, deletion protection, health check setting, cool down period and minimum or maximum number of ECS instances allowed in the group.
It's worth noting that if the number of ECS instances in the scale group doesn't meet the new minimum number or maximum number settings, Auto Scaling will create a scaling activity to either add or remove ECS instances to or from the group until the minimum or maximum count value is reached. Modify operations can only be executed for scale groups that are in an active or inactive state.
Enabling and disabling scaling groups. For enabling, you can only enable an inactive scale group if it has an active scaling configuration. A single scale group can have only one active scaling configuration at a time, although it can also have several inactive scaling configurations that you could replace the active one with. You can enable a scale group, such that if an existing number of ECS instances is less than the minimum size value of an enabled or active scale group, then Auto Scaling will create new pay You go ECS instances until the minimum size value is reached. And for disabling, a scale group can only be disabled when it is not executing any scaling activity. And this operation can only be executed for active scaling groups.
I do want to point out that any operations that take place within a scale group can trigger CloudMonitor event notifications or messages from the message notification service if an event notification has been created. This is so that you can be notified when a state change occurs in your scale group, either by email or by SMS. You can also enable what are called lifecycle hooks which means that when an instance is added or removed from your instance pool, you can have certain operations take place on that instance to set it up prior to service requests or potentially to finish up any requests that the instance was handling before it's removed from the pool and released.
Deleting scaling groups. When you delete a scale group from the console, it's deleted in ForceDelete mode. Deleting the scale group also deletes its: Scaling configurations, scaling rules, scaling activities, and scaling requests. Deleting the scale group does not delete scheduled tasks, any server load balancer instances or RDS instances that were attached to the group. These items all live outside of the group. That concludes the session on scaling groups. In the next session, I'll demonstrate how to create a scale group.
David’s IT career started in 1990, when he took on the role of Database Administrator as a favor for his boss. He redirected his career into the Client Server side of Microsoft with NT4, and then progressed to Active Directory and each subsequent version of Microsoft Client/Server Operating Systems. In 2007 he joined QA as a Technical Trainer, and has delivered training in Server systems from 2003 to 2016 and Client systems from XP onwards. Currently, David is a Principal Technical Learning Specialist (Cloud), and delivers training in Azure Cloud Computing, specializing in Infrastructure Compute and Storage. David also delivers training in Microsoft PowerShell, and is qualified in the Alibaba Cloud Space.