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Use the same order for values in all applications: 1. Common configuration parameters in the specified order, if exist: - replicas - shards - resources - resourcesPreset - size - storageClass - external (goes last, because we don't want to promote this practice) 2. Application-specific parameters, such as database and users 3. Component-specific, each component under its own section 4. Backup 5. Bootstrap (recovery) Signed-off-by: Nick Volynkin <nick.volynkin@gmail.com>
131 lines
6.1 KiB
Markdown
131 lines
6.1 KiB
Markdown
# Managed Nginx-based HTTP Cache Service
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The Nginx-based HTTP caching service is designed to optimize web traffic and enhance web application performance.
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This service combines custom-built Nginx instances with HAProxy for efficient caching and load balancing.
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## Deployment information
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The Nginx instances include the following modules and features:
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- VTS module for statistics
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- Integration with ip2location
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- Integration with ip2proxy
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- Support for 51Degrees
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- Cache purge functionality
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HAproxy plays a vital role in this setup by directing incoming traffic to specific Nginx instances based on a consistent hash calculated from the URL. Each Nginx instance includes a Persistent Volume Claim (PVC) for storing cached content, ensuring fast and reliable access to frequently used resources.
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## Deployment Details
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The deployment architecture is illustrated in the diagram below:
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```
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┌─────────┐
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│ metallb │ arp announce
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└────┬────┘
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│
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│
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┌───────▼───────────────────────────┐
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│ kubernetes service │ node
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│ (externalTrafficPolicy: Local) │ level
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└──────────┬────────────────────────┘
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│
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│
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┌────▼────┐ ┌─────────┐
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│ haproxy │ │ haproxy │ loadbalancer
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│ (active)│ │ (backup)│ layer
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└────┬────┘ └─────────┘
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│
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│ balance uri whole
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│ hash-type consistent
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┌──────┴──────┬──────────────┐
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┌───▼───┐ ┌───▼───┐ ┌───▼───┐ caching
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│ nginx │ │ nginx │ │ nginx │ layer
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└───┬───┘ └───┬───┘ └───┬───┘
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│ │ │
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┌────┴───────┬─────┴────┬─────────┴──┐
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│ │ │ │
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┌───▼────┐ ┌────▼───┐ ┌───▼────┐ ┌────▼───┐
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│ origin │ │ origin │ │ origin │ │ origin │
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└────────┘ └────────┘ └────────┘ └────────┘
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```
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## Known issues
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- VTS module shows wrong upstream response time, [github.com/vozlt/nginx-module-vts#198](https://github.com/vozlt/nginx-module-vts/issues/198)
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## Parameters
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### Common parameters
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| Name | Description | Value |
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| -------------- | ----------------------------------------------- | ------- |
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| `size` | Persistent Volume size | `10Gi` |
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| `storageClass` | StorageClass used to store the data | `""` |
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| `external` | Enable external access from outside the cluster | `false` |
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### Application-specific parameters
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| Name | Description | Value |
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| ----------- | ----------------------- | ----- |
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| `endpoints` | Endpoints configuration | `[]` |
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### HAProxy parameters
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| Name | Description | Value |
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| ------------------------- | ------------------------------------------------------------------------------------------------------------------------------------ | ------ |
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| `haproxy.replicas` | Number of HAProxy replicas | `2` |
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| `haproxy.resources` | Explicit CPU and memory configuration for each HAProxy replica. When left empty, the preset defined in `resourcesPreset` is applied. | `{}` |
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| `haproxy.resourcesPreset` | Default sizing preset used when `resources` is omitted. Allowed values: nano, micro, small, medium, large, xlarge, 2xlarge. | `nano` |
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### Nginx parameters
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| Name | Description | Value |
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| ----------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | ------ |
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| `nginx.replicas` | Number of Nginx replicas | `2` |
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| `nginx.resources` | Explicit CPU and memory configuration for each nginx replica. When left empty, the preset defined in `resourcesPreset` is applied. | `{}` |
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| `nginx.resourcesPreset` | Default sizing preset used when `resources` is omitted. Allowed values: nano, micro, small, medium, large, xlarge, 2xlarge. | `nano` |
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## Parameter examples and reference
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### resources and resourcesPreset
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`resources` sets explicit CPU and memory configurations for each replica.
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When left empty, the preset defined in `resourcesPreset` is applied.
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```yaml
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resources:
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cpu: 4000m
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memory: 4Gi
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```
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`resourcesPreset` sets named CPU and memory configurations for each replica.
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This setting is ignored if the corresponding `resources` value is set.
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| Preset name | CPU | memory |
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|-------------|--------|---------|
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| `nano` | `250m` | `128Mi` |
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| `micro` | `500m` | `256Mi` |
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| `small` | `1` | `512Mi` |
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| `medium` | `1` | `1Gi` |
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| `large` | `2` | `2Gi` |
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| `xlarge` | `4` | `4Gi` |
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| `2xlarge` | `8` | `8Gi` |
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### endpoints
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`endpoints` is a flat list of IP addresses:
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```yaml
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endpoints:
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- 10.100.3.1:80
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- 10.100.3.11:80
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- 10.100.3.2:80
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- 10.100.3.12:80
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- 10.100.3.3:80
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- 10.100.3.13:80
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```
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