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Mitchell Hashimoto 2018-09-25 21:55:32 -05:00
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website/source/docs/platform/k8s/service-sync.html.md
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@ -16,9 +16,9 @@ automatically installed and configured using the
[Consul Helm chart](/docs/platform/k8s/helm.html). [Consul Helm chart](/docs/platform/k8s/helm.html).
**Why sync Kubernetes services to Consul?** Kubernetes services synced to the **Why sync Kubernetes services to Consul?** Kubernetes services synced to the
Consul catalog enable Kubernetes services to be accessed by non-Kubernetes Consul catalog enable Kubernetes services to be accessed by any node that
nodes that are part of the Consul cluster or by other distinct Kubernetes is part of the Consul cluster, including other distinct Kubernetes clusters.
clusters. For non-Kubernetes nodes, they can access services using the standard For non-Kubernetes nodes, they can access services using the standard
[Consul DNS](/docs/agent/dns.html) or HTTP API. [Consul DNS](/docs/agent/dns.html) or HTTP API.
**Why sync Consul services to Kubernetes?** Syncing Consul services to **Why sync Consul services to Kubernetes?** Syncing Consul services to
@ -31,7 +31,7 @@ service discovery, including hosted services like databases.
The service sync is done using an external long-running process in the The service sync is done using an external long-running process in the
[consul-k8s project](https://github.com/hashicorp/consul-k8s). This process [consul-k8s project](https://github.com/hashicorp/consul-k8s). This process
can run both in or out of a Kubernetes cluster. However, running this within can run either in or out of a Kubernetes cluster. However, running this within
the Kubernetes cluster is generally easier since it is automated using the the Kubernetes cluster is generally easier since it is automated using the
[Helm chart](/docs/platform/k8s/helm.html). [Helm chart](/docs/platform/k8s/helm.html).
@ -99,7 +99,7 @@ node that has the representative pod running. While Kubernetes configures
a static port on all nodes in the cluster, this limits the number of service a static port on all nodes in the cluster, this limits the number of service
instances to be equal to the nodes running the target pods. instances to be equal to the nodes running the target pods.
The service instances registered will be registered to the K8S node name The service instances will be registered to the Kubernetes node name
that each instance lives on. This is guaranteed unique by Kubernetes. An that each instance lives on. This is guaranteed unique by Kubernetes. An
existing node entry will be used if it is already part of the Consul existing node entry will be used if it is already part of the Consul
cluster (for example if you're running a client agent on all Kubernetes cluster (for example if you're running a client agent on all Kubernetes
@ -184,10 +184,11 @@ The annotation value may a name of a port (recommended) or an exact port value.
### Service Tags ### Service Tags
A service registered in Consul from K8S will always have the tag "k8s" added A service registered in Consul from Kubernetes will always have the tag "k8s" added
to it. Additional tags can be specified with a comma-separated annotation value to it. Additional tags can be specified with a comma-separated annotation value
as shown below. This will also automatically include the "k8s" tag which can't as shown below. This will also automatically include the "k8s" tag which can't
be disabled. be disabled. The values should be specified comma-separated without any
additional whitespace.
```yaml ```yaml
kind: Service kind: Service
@ -200,11 +201,11 @@ metadata:
### Service Meta ### Service Meta
A service registered in Consul from K8S will set the `external-source` key to A service registered in Consul from Kubernetes will set the `external-source` key to
"kubernetes". This can be used by API consumers, the UI, CLI, etc. to filter "kubernetes". This can be used by API consumers, the UI, CLI, etc. to filter
service instances that are set in k8s. The Consul UI (in Consul 1.2.3 and later) service instances that are set in k8s. The Consul UI (in Consul 1.2.3 and later)
will read this value to show a Kubernetes icon next to all externally will read this value to show a Kubernetes icon next to all externally
registered services. registered services from Kubernetes.
Additional metadata can be specified using annotations. The "KEY" below can be Additional metadata can be specified using annotations. The "KEY" below can be
set to any key. This allows setting multiple meta values: set to any key. This allows setting multiple meta values:
@ -237,7 +238,7 @@ addresses directly into service endpoints.
### Sync Enable/Disable ### Sync Enable/Disable
All Consul services visible with the given Consul ACL token to the sync process All Consul services visible to the sync process based on its given ACL token
will be synced to Kubernetes. will be synced to Kubernetes.
There is no way to change this behavior per service. For the opposite sync There is no way to change this behavior per service. For the opposite sync
@ -250,12 +251,12 @@ In the future, we hope to support per-service configuration.
### Service Name ### Service Name
When a Consul service is synced to Kubernetes, the name of the Kubernetes When a Consul service is synced to Kubernetes, the name of the Kubernetes
service will match exactly within Kubernetes. service will exactly match the name of the Consul service.
A service name prefix can be specified to the sync program. If specified, this To change this default exact match behavior, it is possible to specify a
prefix will be attached to Consul services within Kubernetes. This defaults to prefix to be added to service names within Kubernetes by using the
no prefix. The prefix can be specified using the `-k8s-service-prefix` flag `-k8s-service-prefix` flag. This can also be specified in the Helm
and can also be specified using Helm configuration. configuration.
**If a conflicting service is found,** the service will not be synced. This **If a conflicting service is found,** the service will not be synced. This
does not match the Kubernetes to Consul behavior, but given the current does not match the Kubernetes to Consul behavior, but given the current