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## Alibaba Cloud DNS
Rancher External DNS service powered by Alibaba Cloud DNS
#### Usage
##### Supported host labels
`io.rancher.host.external_dns_ip`
Override the IP address used in DNS records for containers running on the host. Defaults to the IP address the host is registered with in Rancher.
`io.rancher.host.external_dns`
Accepts 'true' (default) or 'false'
When this is set to 'false' no DNS records will ever be created for containers running on this host.
##### Supported service labels
`io.rancher.service.external_dns`
Accepts 'always', 'never' or 'auto' (default)
- `always`: Always create DNS records for this service
- `never`: Never create DNS records for this service
- `auto`: Create DNS records for this service if it exposes ports on the host
`io.rancher.service.external_dns_name_template`
Custom DNS name template that overrides global custom DNS name template (see below) of default DNS name template for a specific service
##### Custom DNS name template
By default DNS entries are named `<service>.<stack>.<environment>.<domain>`.
You can specify a custom name template used to construct the subdomain part (left of the domain/zone name) of the DNS records. The following placeholders are supported:
* `%{{service_name}}`
* `%{{stack_name}}`
* `%{{environment_name}}`
**Example:**
`%{{stack_name}}-%{{service_name}}.statictext`
Make sure to only use characters in static text and separators that your provider allows in DNS names.

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alidns:
image: rancher/external-dns:v0.7.4
command: -provider=alidns
expose:
- 1000
environment:
ALICLOUD_ACCESS_KEY_ID: ${ALICLOUD_ACCESS_KEY_ID}
ALICLOUD_ACCESS_KEY_SECRET: ${ALICLOUD_ACCESS_KEY_SECRET}
ROOT_DOMAIN: ${ROOT_DOMAIN}
NAME_TEMPLATE: ${NAME_TEMPLATE}
TTL: ${TTL}
labels:
io.rancher.container.create_agent: "true"
io.rancher.container.agent.role: "external-dns"

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# notemplating
.catalog:
name: "Alibaba Cloud DNS"
version: "v0.1.0"
description: "Rancher External DNS service powered by Alibaba Cloud"
minimum_rancher_version: v1.6.8-rc1
questions:
- variable: "ALICLOUD_ACCESS_KEY_ID"
label: "Access Key ID"
description: "Access key id for your Alibaba Cloud account"
type: "string"
required: true
- variable: "ALICLOUD_ACCESS_KEY_SECRET"
label: "Access Key Secret"
description: "Access key secret for your Alibaba Cloud account"
type: "string"
required: true
- variable: "ROOT_DOMAIN"
label: "Domain"
description: "The DNS zone (domain) managed by Alibaba Cloud. DNS entries will be created for <service>.<stack>.<environment>.<domain>"
type: "string"
required: true
- variable: "TTL"
label: "TTL"
description: "The resource record cache time to live (TTL), in seconds"
type: "int"
default: 600
min: 1
max: 86400
required: false
- variable: "NAME_TEMPLATE"
label: "DNS Name Template"
description: |
Name template used to construct the subdomain part (left of the domain) of the DNS record names.
Supported placeholders: %{{service_name}}, %{{stack_name}}, %{{environment_name}}.
By default DNS entries will be named '<service>.<stack>.<environment>.<domain>'.
type: "string"
default: "%{{service_name}}.%{{stack_name}}.%{{environment_name}}"
required: false
alidns:
health_check:
port: 1000
interval: 5000
unhealthy_threshold: 3
request_line: GET / HTTP/1.0
healthy_threshold: 2
response_timeout: 2000