1# Container Apps Scaling Patterns
2 
3## HTTP-based Scaling
4 
5Best for APIs and web applications:
6 
7```bicep
8scale: {
9  minReplicas: 1
10  maxReplicas: 10
11  rules: [
12    {
13      name: 'http-scaling'
14      http: {
15        metadata: {
16          concurrentRequests: '100'
17        }
18      }
19    }
20  ]
21}
22```
23 
24## Queue-based Scaling
25 
26Best for background workers:
27 
28```bicep
29scale: {
30  minReplicas: 0
31  maxReplicas: 30
32  rules: [
33    {
34      name: 'queue-scaling'
35      azureQueue: {
36        queueName: 'orders'
37        queueLength: 10
38        auth: [
39          {
40            secretRef: 'storage-connection'
41            triggerParameter: 'connection'
42          }
43        ]
44      }
45    }
46  ]
47}
48```
49 
50## Service Bus Scaling
51 
52```bicep
53scale: {
54  minReplicas: 0
55  maxReplicas: 20
56  rules: [
57    {
58      name: 'servicebus-scaling'
59      custom: {
60        type: 'azure-servicebus'
61        metadata: {
62          queueName: 'myqueue'
63          messageCount: '5'
64        }
65        auth: [
66          {
67            secretRef: 'servicebus-connection'
68            triggerParameter: 'connection'
69          }
70        ]
71      }
72    }
73  ]
74}
75```
76 
77## Recommendations
78 
79| Workload | Min Replicas | Max Replicas | Rule Type |
80|----------|--------------|--------------|-----------|
81| Production API | 1 | 10-20 | HTTP |
82| Dev/Test API | 0 | 5 | HTTP |
83| Background Worker | 0 | 30+ | Queue/Event |
84| Scheduled Job | 0 | 1 | KEDA cron |
85