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6d13d2cf92
The problem is that there's no official way to close Kuberentes client underlying TCP/HTTP connections. So each time Talos initializes connection to the control plane endpoint, new client is built, but this client is never closed, so the connection stays active on the load balancers, on the API server level, etc. It also eats some resources out of Talos itself. We add a way to close underlying connections by using helper from the Kubernetes client libraries to force close all TCP connections which should shut down all HTTP/2 connections as well. Alternative approach might be to cache a client for some time, but many of the clients are created with temporary PKI, so even cached client still needs to be closed once it gets stale, and it's not clear how to recreate a client in case existing one is broken for one reason or another (and we need to force a re-connection). Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// Package cluster provides functions to access, check and inspect Talos clusters.
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package cluster
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import (
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"context"
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"io"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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k8s "github.com/talos-systems/talos/pkg/kubernetes"
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"github.com/talos-systems/talos/pkg/machinery/client"
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"github.com/talos-systems/talos/pkg/machinery/config/types/v1alpha1/machine"
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)
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// ClientProvider builds Talos client by endpoint.
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//
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// Client instance should be cached and closed when Close() is called.
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type ClientProvider interface {
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// Client returns Talos client instance for default (if no endpoints are given) or
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// specific endpoint.
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Client(endpoints ...string) (*client.Client, error)
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// Close client connections.
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Close() error
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}
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// K8sProvider builds Kubernetes client to access Talos cluster.
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type K8sProvider interface {
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Kubeconfig(ctx context.Context) ([]byte, error)
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K8sRestConfig(ctx context.Context) (*rest.Config, error)
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K8sClient(ctx context.Context) (*kubernetes.Clientset, error)
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K8sHelper(ctx context.Context) (*k8s.Client, error)
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K8sClose() error
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}
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// CrashDumper captures Talos cluster state to the specified writer for debugging.
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type CrashDumper interface {
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CrashDump(ctx context.Context, out io.Writer)
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}
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// Info describes the Talos cluster.
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type Info interface {
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// Nodes returns list of all node endpoints (IPs).
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Nodes() []string
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// NodesByType return list of node endpoints by type.
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NodesByType(machine.Type) []string
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}
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// Bootstrapper performs Talos cluster bootstrap.
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type Bootstrapper interface {
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Bootstrap(ctx context.Context, out io.Writer) error
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}
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