Kubernetes client-go 常用配置
client-go config 配置
type Config struct {
// Host must be a host string, a host:port pair, or a URL to the base of the apiserver.
// If a URL is given then the (optional) Path of that URL represents a prefix that must
// be appended to all request URIs used to access the apiserver. This allows a frontend
// proxy to easily relocate all of the apiserver endpoints.
Host string
// APIPath is a sub-path that points to an API root.
APIPath string
// ContentConfig contains settings that affect how objects are transformed when
// sent to the server.
ContentConfig
// Server requires Basic authentication
Username string
Password string `datapolicy:"password"`
// Server requires Bearer authentication. This client will not attempt to use
// refresh tokens for an OAuth2 flow.
// TODO: demonstrate an OAuth2 compatible client.
BearerToken string `datapolicy:"token"`
// Path to a file containing a BearerToken.
// If set, the contents are periodically read.
// The last successfully read value takes precedence over BearerToken.
BearerTokenFile string
// Impersonate is the configuration that RESTClient will use for impersonation.
Impersonate ImpersonationConfig
// Server requires plugin-specified authentication.
AuthProvider *clientcmdapi.AuthProviderConfig
// Callback to persist config for AuthProvider.
AuthConfigPersister AuthProviderConfigPersister
// Exec-based authentication provider.
ExecProvider *clientcmdapi.ExecConfig
// TLSClientConfig contains settings to enable transport layer security
TLSClientConfig
// UserAgent is an optional field that specifies the caller of this request.
UserAgent string
// DisableCompression bypasses automatic GZip compression requests to the
// server.
DisableCompression bool
// Transport may be used for custom HTTP behavior. This attribute may not
// be specified with the TLS client certificate options. Use WrapTransport
// to provide additional per-server middleware behavior.
Transport http.RoundTripper
// WrapTransport will be invoked for custom HTTP behavior after the underlying
// transport is initialized (either the transport created from TLSClientConfig,
// Transport, or http.DefaultTransport). The config may layer other RoundTrippers
// on top of the returned RoundTripper.
//
// A future release will change this field to an array. Use config.Wrap()
// instead of setting this value directly.
WrapTransport transport.WrapperFunc
// QPS indicates the maximum QPS to the master from this client.
// If it's zero, the created RESTClient will use DefaultQPS: 5
QPS float32
// Maximum burst for throttle.
// If it's zero, the created RESTClient will use DefaultBurst: 10.
Burst int
// Rate limiter for limiting connections to the master from this client. If present overwrites QPS/Burst
RateLimiter flowcontrol.RateLimiter
// WarningHandler handles warnings in server responses.
// If not set, the default warning handler is used.
// See documentation for SetDefaultWarningHandler() for details.
WarningHandler WarningHandler
// The maximum length of time to wait before giving up on a server request. A value of zero means no timeout.
Timeout time.Duration
// Dial specifies the dial function for creating unencrypted TCP connections.
Dial func(ctx context.Context, network, address string) (net.Conn, error)
// Proxy is the proxy func to be used for all requests made by this
// transport. If Proxy is nil, http.ProxyFromEnvironment is used. If Proxy
// returns a nil *URL, no proxy is used.
//
// socks5 proxying does not currently support spdy streaming endpoints.
Proxy func(*http.Request) (*url.URL, error)
// Version forces a specific version to be used (if registered)
// Do we need this?
// Version string
}
其中常用的：
UserAgent: 配置来源放，用于apiserver识别请求来源。 格式：{client-name}/{version} {from}/{version}比如：demo1/v0.0.1 Kubernetes/b136f3s；Transport: golang http transport 用于配置http connections；QPS和Burst单实例qps和burst. 来决定RateLimiter；Timeout: 请求超时，非http Transport中细力度超时；Dial: 使用TCP链接；
client-go 环境变量配置: https://pkg.go.dev/k8s.io/apimachinery
KUBE_PATCH_CONVERSION_DETECTOR: 比较PATCH请求冲突，如果出行冲突，则会触发一个panic. 默认 falseKUBE_CACHE_MUTATION_DETECTOR:sharedIndexInformer实例化的是defaultCacheMutationDetector，该实例会以1s为间隔，定期执行检查缓存，如果发现缓存被修改，则会触发一个失败处理函数，如果该函数没被定义，则会触发一个panic. 默认 falseGODEBUG: 开启golang中一个控制runtime调度变量的变量. 使用：https://dave.cheney.net/tag/godebugDEBUG_HTTP2_GOROUTINES: 开启client侧 http2.0 gotraceNO_PROXY和no_proxy: 绕过代理DISABLE_HTTP2: 配置将默认http2转http1.1，默认值 ''HTTP2_READ_IDLE_TIMEOUT_SECONDS: http2 healthcheck 时间周期，默认值 30sHTTP2_PING_TIMEOUT_SECONDS: http2 healthcheck 等待响应时间，默认值 15sKUBERNETES_SERVICE_HOST和KUBERNETES_SERVICE_PORT: 替换kubconfig中的 host和port；
其他
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