docs/archived/v0.21-docs/reference/index.xml

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    <title>Knative – Knative Reference Documentation</title>
    <link>https://knative.dev/v0.21-docs/reference/</link>
    <description>Recent content in Knative Reference Documentation on Knative</description>
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    <item>
      <title>V0.21-Docs: Knative Release Notes</title>
      <link>https://knative.dev/v0.21-docs/reference/relnotes/</link>
      <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
      
      <guid>https://knative.dev/v0.21-docs/reference/relnotes/</guid>
      <description>
        
        
        &lt;p&gt;For details about the Knative releases, see the following pages:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;a href=&#34;https://github.com/knative/serving/releases&#34;&gt;Knative Serving releases&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&#34;https://github.com/knative/serving-operator/releases&#34;&gt;Knative Serving Operator releases&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&#34;https://github.com/knative/client/releases&#34;&gt;Knative CLI releases&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href=&#34;https://github.com/knative/eventing/releases&#34;&gt;Knative Eventing releases&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;

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    <item>
      <title>V0.21-Docs: Knative API Reference Documentation</title>
      <link>https://knative.dev/v0.21-docs/reference/api/</link>
      <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
      
      <guid>https://knative.dev/v0.21-docs/reference/api/</guid>
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    <item>
      <title>V0.21-Docs: Additional resources</title>
      <link>https://knative.dev/v0.21-docs/reference/resources/</link>
      <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate>
      
      <guid>https://knative.dev/v0.21-docs/reference/resources/</guid>
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        &lt;p&gt;This page contains information about various tools and technologies that are
useful to anyone developing on Knative.&lt;/p&gt;
&lt;h3 id=&#34;kohttpsgithubcomgoogleko&#34;&gt;&lt;a href=&#34;https://github.com/google/ko&#34;&gt;&lt;code&gt;ko&lt;/code&gt;&lt;/a&gt;&lt;/h3&gt;
&lt;p&gt;&lt;code&gt;ko&lt;/code&gt; is a tool designed to make development of Go apps on Kubernetes easier, by
abstracting away the container image being used, and instead referring to Go
packages by their &lt;a href=&#34;https://golang.org/doc/code.html#ImportPaths&#34;&gt;import paths&lt;/a&gt;
(e.g., &lt;code&gt;github.com/kaniko/serving/cmd/controller&lt;/code&gt;)&lt;/p&gt;
&lt;p&gt;The typical usage is &lt;code&gt;ko apply --filename config.yaml&lt;/code&gt;, which reads in the
config YAML, and looks for Go import paths representing runnable commands (i.e.,
&lt;code&gt;package main&lt;/code&gt;). When it finds a matching import path, &lt;code&gt;ko&lt;/code&gt; builds the package
using &lt;code&gt;go build&lt;/code&gt; then pushes a container image containing that binary on top of
a base image (by default, &lt;code&gt;gcr.io/distroless/base&lt;/code&gt;) to
&lt;code&gt;$KO_DOCKER_REPO/unique-string&lt;/code&gt;. After pushing those images, &lt;code&gt;ko&lt;/code&gt; replaces
instances of matched import paths with fully-qualified references to the images
it pushed.&lt;/p&gt;
&lt;p&gt;So if &lt;code&gt;ko apply&lt;/code&gt; was passed this config:&lt;/p&gt;
&lt;div class=&#34;highlight&#34;&gt;&lt;pre style=&#34;background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4&#34;&gt;&lt;code class=&#34;language-yaml&#34; data-lang=&#34;yaml&#34;&gt;&lt;span style=&#34;color:#000&#34;&gt;---&lt;/span&gt;&lt;span style=&#34;color:#f8f8f8;text-decoration:underline&#34;&gt;
&lt;/span&gt;&lt;span style=&#34;color:#f8f8f8;text-decoration:underline&#34;&gt;&lt;/span&gt;&lt;span style=&#34;color:#204a87;font-weight:bold&#34;&gt;image&lt;/span&gt;&lt;span style=&#34;color:#000;font-weight:bold&#34;&gt;:&lt;/span&gt;&lt;span style=&#34;color:#f8f8f8;text-decoration:underline&#34;&gt; &lt;/span&gt;&lt;span style=&#34;color:#000&#34;&gt;github.com/my/repo/cmd/foo&lt;/span&gt;&lt;span style=&#34;color:#f8f8f8;text-decoration:underline&#34;&gt;
&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;p&gt;&amp;hellip;it would produce YAML like:&lt;/p&gt;
&lt;div class=&#34;highlight&#34;&gt;&lt;pre style=&#34;background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4&#34;&gt;&lt;code class=&#34;language-yaml&#34; data-lang=&#34;yaml&#34;&gt;&lt;span style=&#34;color:#000&#34;&gt;---&lt;/span&gt;&lt;span style=&#34;color:#f8f8f8;text-decoration:underline&#34;&gt;
&lt;/span&gt;&lt;span style=&#34;color:#f8f8f8;text-decoration:underline&#34;&gt;&lt;/span&gt;&lt;span style=&#34;color:#204a87;font-weight:bold&#34;&gt;image&lt;/span&gt;&lt;span style=&#34;color:#000;font-weight:bold&#34;&gt;:&lt;/span&gt;&lt;span style=&#34;color:#f8f8f8;text-decoration:underline&#34;&gt; &lt;/span&gt;&lt;span style=&#34;color:#000&#34;&gt;gcr.io/my-docker-repo/foo-zyxwvut@sha256:abcdef&lt;/span&gt;&lt;span style=&#34;color:#f8f8f8;text-decoration:underline&#34;&gt; &lt;/span&gt;&lt;span style=&#34;color:#8f5902;font-style:italic&#34;&gt;# image by digest&lt;/span&gt;&lt;span style=&#34;color:#f8f8f8;text-decoration:underline&#34;&gt;
&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;p&gt;(This assumes that you have set the environment variable
&lt;code&gt;KO_DOCKER_REPO=gcr.io/my-docker-repo&lt;/code&gt;)&lt;/p&gt;
&lt;p&gt;&lt;code&gt;ko apply&lt;/code&gt; then passes this generated YAML config to &lt;code&gt;kubectl apply&lt;/code&gt;.&lt;/p&gt;
&lt;p&gt;&lt;code&gt;ko&lt;/code&gt; also supports:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;code&gt;ko publish&lt;/code&gt; to simply push images and not produce configs.&lt;/li&gt;
&lt;li&gt;&lt;code&gt;ko resolve&lt;/code&gt; to push images and output the generated configs, but not
&lt;code&gt;kubectl apply&lt;/code&gt; them.&lt;/li&gt;
&lt;li&gt;&lt;code&gt;ko delete&lt;/code&gt; to simply passthrough to &lt;code&gt;kubectl delete&lt;/code&gt; for convenience.&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;code&gt;ko&lt;/code&gt; is used during development and release of Knative components, but is not
intended to be required for &lt;em&gt;users&lt;/em&gt; of Knative &amp;ndash; they should only need to
&lt;code&gt;kubectl apply&lt;/code&gt; released configs generated by &lt;code&gt;ko&lt;/code&gt;.&lt;/p&gt;

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