64 lines
2.7 KiB
Go
64 lines
2.7 KiB
Go
// Package envoy provides a high level view of the variables that go into
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// selecting an envoy version.
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package envoy
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import (
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"fmt"
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)
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const (
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// SidecarMetaParam is the parameter name used to configure the connect sidecar
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// at the client level. Setting this option in client configuration takes the
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// lowest precedence.
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//
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// If this meta option is not set in client configuration, it defaults to
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// ImageFormat, so that Nomad will defer envoy version selection to Consul.
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SidecarMetaParam = "connect.sidecar_image"
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// SidecarConfigVar is used as the default config.image value for connect
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// sidecar proxies, when they are injected in the job connect mutator.
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SidecarConfigVar = "${meta." + SidecarMetaParam + "}"
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// GatewayMetaParam is the parameter name used to configure the connect gateway
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// at the client level. Setting this option in client configuration takes the
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// lowest precedence.
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//
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// If this meta option is not set in client configuration, it defaults to
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// ImageFormat, so that Nomad will defer envoy version selection to Consul.
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GatewayMetaParam = "connect.gateway_image"
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// GatewayConfigVar is used as the default config.image value for connect
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// gateway proxies, when they are injected in the job connect mutator.
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GatewayConfigVar = "${meta." + GatewayMetaParam + "}"
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// ImageFormat is the default format string used for official envoy Docker
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// images with the tag being the semver of the version of envoy. Nomad fakes
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// interpolation of ${NOMAD_envoy_version} by replacing it with the version
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// string for envoy that Consul reports as preferred.
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//
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// Folks wanting to build and use custom images while still having Nomad refer
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// to specific versions as preferred by Consul would set meta.connect.sidecar_image
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// to something like: "custom/envoy:${NOMAD_envoy_version}".
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ImageFormat = "envoyproxy/envoy:v" + VersionVar
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// VersionVar will be replaced with the Envoy version string when
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// used in the meta.connect.sidecar_image variable.
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VersionVar = "${NOMAD_envoy_version}"
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// FallbackImage is the image set in the node meta by default
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// to be used by Consul Connect sidecar tasks. As of Nomad 1.0, this value
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// is only used as a fallback when the version of Consul does not yet support
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// dynamic envoy versions.
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FallbackImage = "envoyproxy/envoy:v1.11.2@sha256:a7769160c9c1a55bb8d07a3b71ce5d64f72b1f665f10d81aa1581bc3cf850d09"
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)
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// PortLabel creates a consistent port label using the inputs of a prefix,
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// service name, and optional suffix. The prefix should be the Kind part of
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// TaskKind the envoy is being configured for.
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func PortLabel(prefix, service, suffix string) string {
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if suffix == "" {
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return fmt.Sprintf("%s-%s", prefix, service)
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}
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return fmt.Sprintf("%s-%s-%s", prefix, service, suffix)
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}
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