This article is shared from Tianyi Cloud Developer CommunityThe whole process of creating a cloud host in batches》, author: Le Dao
Last time we talked about the process of creating a cloud host. During the entire process, we did not distinguish the basic functions of each component in detail. This chapter will explain in detail the processing process of each component in the batch creation process.
1. We use console or openapi to place an order operation to create cloud hosts in batches, such as creating 50 units in batches.
2. The above-mentioned order information will be passed to IT. On the one hand, IT will return the basic information of the order (that is, the order information page we usually see).
On the other hand, the order will be disassembled, 50 units will be created to create 50 sub-orders, and the order will be placed through [Service Opening] (the service is activated this component). The service will handle the orders.
3. Then forward the above order information to MsgHandler to complete the forwarding of the order (MsgHandler is a middleware, similar to mq and kafaka)
4. MsgHandler issues 50 sub-order information to Admin (the Ctyun MQ message we usually see on the admin platform is the MQ message sent to admin by IT)
5. Admin calls the yacos interface and calls it 50 times to enable the action of opening the cloud host.
(The interface timeout time of Admin calling yacos is set to 10s. The first sub-order will create 50 cloud hosts in batches. If the second sub-order times out, the message will be resent, and admin will be resent.
We will follow the old process to create cloud hosts, which will lead to the phenomenon that we have created 600 units and actually 608 cloud hosts)
6. Yacos notifies the underlying layer to enable resource activation, including creating disks, creating network cards, and creating virtual machines. After the underlying layer creates disks, the system disk id will be returned to yacos. Yacos will poll whether the disk is created successfully.
After that, we will create a virtual machine and return the virtual machine id to yacos. Yacos will poll whether the virtual machine is created successfully. The network card is created at the bottom. Similarly, yacos will poll whether the network card is created successfully. After that, this will be selected.
Network card bound to virtual machine
7. After all activation is completed, yacos will reply to Admin and call Admin's interface to inform Admin.
8. Admin will reply to MsgHandler and write the reply message to the MQ queue.
9. MsgHandler will report the order to IT. When the order is completed, the order will be displayed as [Completed]
10. After that, IT will issue the expiration time to MsgHandler. At the same time, MsgHandler will issue it to Admin, Admin will issue it to yacos. After the issuance expiration time, the status of the cloud host will change from creating to running.
As of now, the entire process of batch creation has ended