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91 lines
2.6 KiB
Markdown
91 lines
2.6 KiB
Markdown
Configure DNS record TTL (Time-To-Live)
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=======================================
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An optional annotation `external-dns.alpha.kubernetes.io/ttl` is available to customize the TTL value of a DNS record.
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TTL is specified as an integer encoded as string representing seconds.
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To configure it, simply annotate a service/ingress, e.g.:
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```yaml
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apiVersion: v1
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kind: Service
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metadata:
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annotations:
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external-dns.alpha.kubernetes.io/hostname: nginx.external-dns-test.my-org.com.
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external-dns.alpha.kubernetes.io/ttl: "60"
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...
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```
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TTL can also be specified as a duration value parsable by Golang [time.ParseDuration](https://golang.org/pkg/time/#ParseDuration):
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```yaml
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apiVersion: v1
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kind: Service
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metadata:
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annotations:
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external-dns.alpha.kubernetes.io/hostname: nginx.external-dns-test.my-org.com.
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external-dns.alpha.kubernetes.io/ttl: "1m"
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...
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```
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Both examples result in the same value of 60 seconds TTL.
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TTL must be a positive value.
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Providers
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=========
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- [x] AWS (Route53)
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- [x] Azure
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- [ ] Cloudflare
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- [x] DigitalOcean
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- [x] DNSimple
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- [x] Google
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- [ ] InMemory
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- [x] Linode
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- [x] TransIP
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- [x] RFC2136
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- [x] Vultr
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- [x] UltraDNS
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PRs welcome!
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Notes
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=====
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When the `external-dns.alpha.kubernetes.io/ttl` annotation is not provided, the TTL will default to 0 seconds and `endpoint.TTL.isConfigured()` will be false.
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### AWS Provider
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The AWS Provider overrides the value to 300s when the TTL is 0.
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This value is a constant in the provider code.
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## Azure
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TTL value should be between 1 and 2,147,483,647 seconds.
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By default it will be 300s.
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### DigitalOcean Provider
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The DigitalOcean Provider overrides the value to 300s when the TTL is 0.
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This value is a constant in the provider code.
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### DNSimple Provider
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The DNSimple Provider default TTL is used when the TTL is 0. The default TTL is 3600s.
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### Google Provider
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Previously with the Google Provider, TTL's were hard-coded to 300s.
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For safety, the Google Provider overrides the value to 300s when the TTL is 0.
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This value is a constant in the provider code.
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For the moment, it is impossible to use a TTL value of 0 with the AWS, DigitalOcean, or Google Providers.
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This behavior may change in the future.
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### Linode Provider
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The Linode Provider default TTL is used when the TTL is 0. The default is 24 hours
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### TransIP Provider
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The TransIP Provider minimal TTL is used when the TTL is 0. The minimal TTL is 60s.
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### Vultr Provider
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The Vultr provider minimal TTL is used when the TTL is 0. The default is 1 hour.
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### UltraDNS
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The UltraDNS provider minimal TTL is used when the TTL is not provided. The default TTL is account level default TTL, if defined, otherwise 24 hours.
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