Why Does the Client Fail to Receive Subscription Information After an Application Is Deployed on CCE?
A subscription server (redis) is deployed on CCE. After receiving a subscription request from a client, the subscription server pushes information to the client periodically.
Symptom
The first sub/pub interaction is successful. However, after a 10-minute period of no data transfer between the server and the client, the client cannot receive any information.
Possible Cause
When the client establishes a communication link with the server for the first time to send a subscription request, the client actively allows communication with the server. However, the communication link expires in 10 minutes because the cluster's security group rules have a 10-minute aging time. There are no security group rules for the client. As a result, the server cannot initiate communication again and subsequent sub/pub is abnormal.
Solution
To add security group rules for the client, perform the following steps:
- Log in to the ECS console. In the navigation pane, choose Access Control > Security Groups.
- Click Create Security Group. Configure security group parameters and click OK.
Figure 1 Creating a security group
- Add an inbound rule.
Figure 2 Adding an inbound rule
- Add an outbound rule.
Figure 3 Adding an outbound rule
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