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@ -96,9 +96,9 @@ There are 4 ways that a container manifest can be provided to the Kubelet:
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### Kubernetes Proxy
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Each node also runs a simple network proxy. This reflects `services` as defined in the Kubernetes API on each node and can do simple TCP stream forwarding or round robin TCP forwarding across a set of backends.
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Each node also runs a simple network proxy. This reflects `services` (see [here](docs/services.md) for more details) as defined in the Kubernetes API on each node and can do simple TCP and UDP stream forwarding (round robin) across a set of backends.
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Service endpoints are currently found through [Docker-links-compatible](https://docs.docker.com/userguide/dockerlinks/) environment variables specifying ports opened by the service proxy. Currently the user must select a unique port to expose the service on on the proxy, as well as the container's port to target.
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Service endpoints are currently found through environment variables (both [Docker-links-compatible](https://docs.docker.com/userguide/dockerlinks/) and Kubernetes {FOO}_SERVICE_HOST and {FOO}_SERVICE_PORT variables are supported). These variables resolve to ports managed by the service proxy.
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## The Kubernetes Control Plane
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@ -40,7 +40,7 @@ key1 exists
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LIST and WATCH operations may specify label selectors to filter the sets of objects returned using a query parameter: `?labels=key1%3Dvalue1,key2%3Dvalue2,...`. We may extend such filtering to DELETE operations in the future.
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Kubernetes also currently supports two objects that use label selectors to keep track of their members, `service`s and `replicationController`s:
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- `service`: A service is a configuration unit for the proxies that run on every worker node. It is named and points to one or more pods.
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- `service`: A [service](services.md) is a configuration unit for the proxies that run on every worker node. It is named and points to one or more pods.
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- `replicationController`: A [replication controller](replication-controller.md) ensures that a specified number of pod "replicas" are running at any one time. If there are too many, it'll kill some. If there are too few, it'll start more.
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The set of pods that a `service` targets is defined with a label selector. Similarly, the population of pods that a `replicationController` is monitoring is also defined with a label selector.
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@ -82,7 +82,7 @@ We want to be able to assign IP addresses externally from Docker ([Docker issue
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In addition to enabling self-registration with 3rd-party discovery mechanisms, we'd like to setup DDNS automatically ([Issue #146](https://github.com/GoogleCloudPlatform/kubernetes/issues/146)). hostname, $HOSTNAME, etc. should return a name for the pod ([Issue #298](https://github.com/GoogleCloudPlatform/kubernetes/issues/298)), and gethostbyname should be able to resolve names of other pods. Probably we need to set up a DNS resolver to do the latter ([Docker issue #2267](https://github.com/dotcloud/docker/issues/2267)), so that we don't need to keep /etc/hosts files up to date dynamically.
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Service endpoints are currently found through [Docker-links-compatible](https://docs.docker.com/userguide/dockerlinks/) environment variables specifying ports opened by the service proxy. We don't actually use [the Docker ambassador pattern](https://docs.docker.com/articles/ambassador_pattern_linking/) to link containers because we don't require applications to identify all clients at configuration time. Regardless, we're considering moving away from the current approach to an approach more akin to our approach for individual pods: allocate an IP address per service and automatically register the service in DDNS -- L3 load balancing, essentially. Using a flat service namespace doesn't scale and environment variables don't permit dynamic updates, which complicates service deployment by imposing implicit ordering constraints.
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[Service](https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/services.md) endpoints are currently found through environment variables. Both [Docker-links-compatible](https://docs.docker.com/userguide/dockerlinks/) variables and kubernetes-specific variables ({NAME}_SERVICE_HOST and {NAME}_SERVICE_BAR) are supported, and resolve to ports opened by the service proxy. We don't actually use [the Docker ambassador pattern](https://docs.docker.com/articles/ambassador_pattern_linking/) to link containers because we don't require applications to identify all clients at configuration time, yet. While services today are managed by the service proxy, this is an implementation detail that applications should not rely on. Clients should instead use the [service portal IP](https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/services.md) (which the above environment variables will resolve to). However, a flat service namespace doesn't scale and environment variables don't permit dynamic updates, which complicates service deployment by imposing implicit ordering constraints. We intend to register each service portal IP in DNS, and for that to become the preferred resolution protocol.
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We'd also like to accommodate other load-balancing solutions (e.g., HAProxy), non-load-balanced services ([Issue #260](https://github.com/GoogleCloudPlatform/kubernetes/issues/260)), and other types of groups (worker pools, etc.). Providing the ability to Watch a label selector applied to pod addresses would enable efficient monitoring of group membership, which could be directly consumed or synced with a discovery mechanism. Event hooks ([Issue #140](https://github.com/GoogleCloudPlatform/kubernetes/issues/140)) for join/leave events would probably make this even easier.
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151
docs/services.md
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151
docs/services.md
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@ -0,0 +1,151 @@
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# Services in Kubernetes
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## Overview
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Kubernetes [`Pods`](pods.md) are ephemeral. They can come and go over time, especially when
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driven by things like [ReplicationControllers](replication-controller.md).
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While each `pod` gets its own IP address, those IP addresses can not be relied
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upon to be stable over time. This leads to a problem: if some set of `pods`
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(let's call them backends) provides functionality to other `pods` (let's call
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them frontends) inside the Kubernetes cluster, how do those frontends find the
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backends?
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Enter `services`.
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A Kubernetes `service` is an abstraction which defines a logical set of `pods` and
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a policy by which to access them - sometimes called a micro-service. The goal
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of `services` is to provide a bridge for non-Kubernetes-native applications to
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access backends without the need to write code that is specific to Kubernetes.
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A `service` offers clients an IP and port pair which, when accessed, redirects
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to the appropriate backends. The set of `pods` targetted is determined by a label
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selector.
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As an example, consider an image-process backend which is running with 3 live
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replicas. Those replicas are fungible - frontends do not care which backend
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they use. While the actual `pods` that comprise the set may change, the
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frontend client(s) do not need to know that. The `service` abstraction
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enables this decoupling.
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## Defining a service
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A `service` in Kubernetes is a REST object, similar to a `pod`. Like a `pod` a
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`service` definitions can be POSTed to the apiserver to create a new instance.
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For example, suppose you have a set of `pods` that each expose port 9376 and
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carry a label "app=MyApp".
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```json
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{
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"id": "myapp",
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"selector": {
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"app": "MyApp"
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},
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"containerPort": 9376,
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"protocol": "TCP",
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"port": 8765
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}
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```
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This specification will create a new `service` named "myapp" which resolves to
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TCP port 9376 on any `pod` with the "app=MyApp" label. To access this
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`service`, a client can simply connect to $MYAPP_SERVICE_HOST on port
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$MYAPP_SERVICE_PORT.
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## How do they work?
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Each node in a Kubernetes cluster runs a `service proxy`. This application
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watches the Kubernetes master for the addition and removal of `service`
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objects and `endpoints` (pods that satisfy a service's label selector), and
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maintains a mapping of `service` to list of `endpoints`. It opens a port on the
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local node for each `service` and forwards traffic to backends (ostensibly
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according to a policy, but the only policy supported for now is round-robin).
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When a `pod` is scheduled, the master adds a set of environment variables for
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each active `service`. We support both
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[Docker-links-compatible](https://docs.docker.com/userguide/dockerlinks/)
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variables and simpler {SVCNAME}_SERVICE_HOST and {SVCNAME}_SERVICE_PORT
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variables. This does imply an ordering requirement - any `service` that a `pod`
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wants to access must be created before the `pod` itself, or else the environment
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variables will not be populated. This restriction will be removed once DNS for
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`services` is supported.
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A `service`, through its label selector, can resolve to 0 or more `endpoints`.
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Over the life of a `services`, the set of `pods` which comprise that
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`services` can
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grow, shrink, or turn over completely. Clients will only see issues if they are
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actively using a backend when that backend is removed from the `services` (and even
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then, open connections will persist for some protocols).
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## The gory details
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The previous information should be sufficient for many people who just want to
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use `services`. However, there is a lot going on behind the scenes that may be
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worth understanding.
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### Avoiding collisions
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One of the primary philosophies of Kubernetes is that users should not be
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exposed to situations that could cause their actions to fail through no fault
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of their own. In this situation, we are looking at network ports - users
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should not have to choose a port number if that choice might collide with
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another user. That is an isolation failure.
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In order to allow users to choose a port number for their `services`, we must
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ensure that no two `services` can collide. We do that by allocating each
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`service` its own IP address.
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### IPs and Portals
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Unlike `pod` IP addresses, which actually route to a fixed destination,
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`service` IPs are not actually answered by a single host. Instead, we use
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`iptables` (packet processing logic in Linux) to define "virtual" IP addresses
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which are transparently redirected as needed. We call the tuple of the
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`service` IP and the `service` port the `portal`. When clients connect to the
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`portal`, their traffic is automatically transported to an appropriate
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endpoint. The environment variables for `services` are actually populated in
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terms of the portal IP and port. We will be adding DNS support for
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`services`, too.
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As an example, consider the image processing application described above.
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when the backend `services` is created, the Kubernetes master assigns a portal
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IP address, for example 10.0.0.1. Assuming the `service` port is 1234, the
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portal is 10.0.0.1:1234. The master stores that information, which is then
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observed by all of the `service proxy` instances in the cluster. When a proxy
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sees a new portal, it opens a new random port, establish an iptables redirect
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from the portal to this new port, and starts accepting connections on it.
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When a client connects to `MYAPP_SERVICE_HOST` on the portal port (whether
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they know the port statically or look it up as MYAPP_SERVICE_PORT), the
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iptables rule kicks in, and redirects the packets to the `service proxy`'s own
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port. The `service proxy` chooses a backend, and starts proxying traffic from
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the client to the backend.
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The net result is that users can choose any `service` port they want without
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risk of collision. Clients can simply connect to an IP and port, without
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being aware of which `pods` they are accessing.
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## Shortcomings
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Part of the `service` specification is a `createExternalLoadBalancer` flag,
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which tells the master to make an external load balancer that points to the
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service. In order to do this today, the service proxy must answer on a known
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(i.e. not random) port. In this case, the service port is promoted to the
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proxy port. This means that is is still possible for users to collide with
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each others services or with other pods. We expect most `services` will not
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set this flag, mitigating the exposure.
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We expect that using iptables for portals will work at small scale, but will
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not scale to large clusters with thousands of services. See [the original
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design proposal for
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portals](https://github.com/GoogleCloudPlatform/kubernetes/issues/1107) for
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more details.
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## Future work
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In the future we envision that the proxy policy can become more nuanced than
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simple round robin balancing, for example master elected or sharded. We also
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envision that some `services` will have "real" load balancers, in which case the
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portal will simply transport the packets there.
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After Width: | Height: | Size: 17 KiB |
Loading…
Reference in New Issue
Block a user