43 lines
4.3 KiB
Markdown
43 lines
4.3 KiB
Markdown
# Nginx-based reverse proxy cluster
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This blueprint shows how to deploy an autoscaling reverse proxy cluster using Nginx, based on regional Managed Instance Groups.
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The autoscaling is driven by Nginx current connections metric, sent by Cloud Ops Agent.
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The example is for Nginx, but it could be easily adapted to any other reverse proxy software (eg. Squid, Varnish, etc).
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## Ops Agent image
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There is a simple [`Dockerfile`](Dockerfile) available for building Ops Agent to be run inside the ContainerOS instance. Build the container, push it to your Container/Artifact Repository and set the `ops_agent_image` to point to the image you built.
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<!-- BEGIN TFDOC -->
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## Variables
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| name | description | type | required | default |
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|---|---|:---:|:---:|:---:|
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| [autoscaling_metric](variables.tf#L31) | | <code title="object({ name = string single_instance_assignment = number target = number type = string # GAUGE, DELTA_PER_SECOND, DELTA_PER_MINUTE filter = string }) default = { name = "workload.googleapis.com/nginx.connections_current" single_instance_assignment = null target = 10 # Target 10 connections per instance, just for demonstration purposes type = "GAUGE" filter = null }">object({…}</code> | ✓ | |
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| [project_name](variables.tf#L108) | Name of an existing project or of the new project | <code>string</code> | ✓ | |
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| [autoscaling](variables.tf#L17) | Autoscaling configuration for the instance group. | <code title="object({ min_replicas = number max_replicas = number cooldown_period = number })">object({…})</code> | | <code title="{ min_replicas = 1 max_replicas = 10 cooldown_period = 30 }">{…}</code> |
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| [backends](variables.tf#L49) | Nginx locations configurations to proxy traffic to. | <code>string</code> | | <code title=""<<-EOT location / { proxy_pass http://10.0.16.58:80; proxy_http_version 1.1; proxy_set_header Connection ""; } EOT"">"<<-EOT…EOT"</code> |
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| [cidrs](variables.tf#L61) | Subnet IP CIDR ranges. | <code>map(string)</code> | | <code title="{ gce = "10.0.16.0/24" }">{…}</code> |
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| [network](variables.tf#L69) | Network name. | <code>string</code> | | <code>"reverse-proxy-vpc"</code> |
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| [network_create](variables.tf#L75) | Create network or use existing one. | <code>bool</code> | | <code>true</code> |
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| [nginx_image](variables.tf#L81) | Nginx container image to use. | <code>string</code> | | <code>"gcr.io/cloud-marketplace/google/nginx1:latest"</code> |
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| [ops_agent_image](variables.tf#L87) | Google Cloud Ops Agent container image to use. | <code>string</code> | | <code>"gcr.io/sfans-hub-project-d647/ops-agent:latest"</code> |
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| [prefix](variables.tf#L93) | Prefix used for resources that need unique names. | <code>string</code> | | <code>""</code> |
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| [project_create](variables.tf#L99) | Parameters for the creation of the new project | <code title="object({ billing_account_id = string parent = string })">object({…})</code> | | <code>null</code> |
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| [region](variables.tf#L113) | Default region for resources. | <code>string</code> | | <code>"europe-west4"</code> |
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| [subnetwork](variables.tf#L119) | Subnetwork name. | <code>string</code> | | <code>"gce"</code> |
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| [tls](variables.tf#L125) | Also offer reverse proxying with TLS (self-signed certificate). | <code>bool</code> | | <code>false</code> |
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## Outputs
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| name | description | sensitive |
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|---|---|:---:|
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| [load_balancer_url](outputs.tf#L17) | Load balancer for the reverse proxy instance group. | |
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<!-- END TFDOC -->
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