mirror of
https://github.com/kubernetes-sigs/kustomize.git
synced 2026-05-18 04:55:08 +00:00
487 lines
17 KiB
Go
487 lines
17 KiB
Go
// Copyright 2019 The Kubernetes Authors.
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
// Code generated by "mdtogo"; DO NOT EDIT.
|
|
package api
|
|
|
|
var ConfigFnLong = `# Configuration Functions API Semantics
|
|
|
|
Configuration Functions are functions packaged as executables in containers which enable
|
|
**shift-left practices**. They configure applications and infrastructure through
|
|
Kubernetes style Resource Configuration, but run locally pre-commit.
|
|
|
|
Configuration functions enable shift-left practices (client-side) through:
|
|
|
|
- Pre-commit / delivery validation and linting of configuration
|
|
- e.g. Fail if any containers don't have PodSecurityPolicy or CPU / Memory limits
|
|
- Implementation of abstractions as client actuated APIs (e.g. templating)
|
|
- e.g. Create a client-side *"CRD"* for generating configuration checked into git
|
|
- Aspect Orient configuration / Injection of cross-cutting configuration
|
|
- e.g. T-Shirt size containers by annotating Resources with ` + "`" + `small` + "`" + `, ` + "`" + `medium` + "`" + `, ` + "`" + `large` + "`" + `
|
|
and inject the cpu and memory resources into containers accordingly.
|
|
- e.g. Inject ` + "`" + `init` + "`" + ` and ` + "`" + `side-car` + "`" + ` containers into Resources based off of Resource
|
|
Type, annotations, etc.
|
|
|
|
Performing these on the client rather than the server enables:
|
|
|
|
- Configuration to be reviewed prior to being sent to the API server
|
|
- Configuration to be validated as part of the CD pipeline
|
|
- Configuration for Resources to validated holistically rather than individually
|
|
per-Resource -- e.g. ensure the ` + "`" + `Service.selector` + "`" + ` and ` + "`" + `Deployment.spec.template` + "`" + ` labels
|
|
match.
|
|
- MutatingWebHooks are scoped to a single Resource instance at a time.
|
|
- Low-level tweaks to the output of high-level abstractions -- e.g. add an ` + "`" + `init container` + "`" + `
|
|
to a client *"CRD"* Resource after it was generated.
|
|
- Composition and layering of multiple functions together
|
|
- Compose generation, injection, validation together
|
|
|
|
Configuration Functions are implemented as executable programs published in containers which:
|
|
|
|
- Accept as input (stdin):
|
|
- A list of Resource Configuration
|
|
- A Function Configuration (to configure the function itself)
|
|
- Emit as output (stdout + exit):
|
|
- A list of Resource Configuration
|
|
- An exit code for success / failure
|
|
|
|
### Function Specification
|
|
|
|
- Functions **SHOULD** be published as container images containing a ` + "`" + `CMD` + "`" + ` invoking an executable.
|
|
- Functions **MUST** accept input on STDIN a ` + "`" + `ResourceList` + "`" + ` containing the Resources and
|
|
` + "`" + `functionConfig` + "`" + `.
|
|
- Functions **MUST** emit output on STDOUT a ` + "`" + `ResourceList` + "`" + ` containing the modified
|
|
Resources.
|
|
- Functions **MUST** exit non-0 on failure, and exit 0 on success.
|
|
- Functions **MAY** emit output on STDERR with error messaging.
|
|
- Functions performing validation **SHOULD** exit failure and emit error messaging
|
|
on a validation failure.
|
|
- Functions generating Resources **SHOULD** retain non-conflicting changes on the
|
|
generated Resources -- e.g. 1. the function generates a Deployment, but doesn't
|
|
specify ` + "`" + `cpu` + "`" + `, 2. the user sets the ` + "`" + `cpu` + "`" + ` on the generated Resource, 3. the
|
|
function should keep the ` + "`" + `cpu` + "`" + ` when regenerating the Resource a second time.
|
|
- Functions **SHOULD** be usable outside ` + "`" + `kustomize config run` + "`" + ` -- e.g. though pipeline
|
|
mechanisms such as Tekton.
|
|
|
|
#### Input Format
|
|
|
|
Functions must accept on STDIN:
|
|
|
|
` + "`" + `ResourceList` + "`" + `:
|
|
- contains ` + "`" + `items` + "`" + ` field, same as ` + "`" + `List.items` + "`" + `
|
|
- contains ` + "`" + `functionConfig` + "`" + ` field -- a single item with the configuration for the function itself
|
|
|
|
Example ` + "`" + `ResourceList` + "`" + ` Input:
|
|
|
|
apiVersion: config.kubernetes.io/v1alpha1
|
|
kind: ResourceList
|
|
functionConfig:
|
|
apiVersion: example.com/v1beta1
|
|
kind: Nginx
|
|
metadata:
|
|
name: my-instance
|
|
annotations:
|
|
config.kubernetes.io/local-config: "true"
|
|
spec:
|
|
replicas: 5
|
|
items:
|
|
- apiVersion: apps/v1
|
|
kind: Deployment
|
|
metadata:
|
|
name: my-instance
|
|
spec:
|
|
replicas: 3
|
|
...
|
|
- apiVersion: v1
|
|
kind: Service
|
|
metadata:
|
|
name: my-instance
|
|
spec:
|
|
...
|
|
|
|
#### Output Format
|
|
|
|
Functions must emit on STDOUT:
|
|
|
|
` + "`" + `ResourceList` + "`" + `:
|
|
- contains ` + "`" + `items` + "`" + ` field, same as ` + "`" + `List.items` + "`" + `
|
|
|
|
Example ` + "`" + `ResourceList` + "`" + ` Output:
|
|
|
|
apiVersion: config.kubernetes.io/v1alpha1
|
|
kind: ResourceList
|
|
items:
|
|
- apiVersion: apps/v1
|
|
kind: Deployment
|
|
metadata:
|
|
name: my-instance
|
|
spec:
|
|
replicas: 5
|
|
...
|
|
- apiVersion: v1
|
|
kind: Service
|
|
metadata:
|
|
name: my-instance
|
|
spec:
|
|
...
|
|
|
|
#### Container Environment
|
|
|
|
When run by ` + "`" + `kustomize config run` + "`" + `, functions are run in containers with the
|
|
following environment:
|
|
|
|
- Network: ` + "`" + `none` + "`" + `
|
|
- User: ` + "`" + `nobody` + "`" + `
|
|
- Security Options: ` + "`" + `no-new-privileges` + "`" + `
|
|
- Volumes: the volume containing the ` + "`" + `functionConfig` + "`" + ` yaml is mounted under ` + "`" + `/local` + "`" + ` as ` + "`" + `ro` + "`" + `
|
|
|
|
### Example Function Implementation
|
|
|
|
Following is an example for implementing an nginx abstraction using a config
|
|
function.
|
|
|
|
#### ` + "`" + `nginx-template.sh` + "`" + `
|
|
|
|
` + "`" + `nginx-template.sh` + "`" + ` is a simple bash script which uses a *heredoc* as a templating solution
|
|
for generating Resources from the functionConfig input fields.
|
|
|
|
The script wraps itself using ` + "`" + `config run wrap -- $0` + "`" + ` which will:
|
|
|
|
1. Parse the ` + "`" + `ResourceList.functionConfig` + "`" + ` (provided to the container stdin) into env vars
|
|
2. Merge the stdout into the original list of Resources
|
|
3. Defaults filenames for newly generated Resources (if they are not set as annotations)
|
|
to ` + "`" + `config/NAME_KIND.yaml` + "`" + `
|
|
4. Format the output
|
|
|
|
#!/bin/bash
|
|
# script must run wrapped by ` + "`" + `kustomize config run wrap` + "`" + `
|
|
# for parsing input the functionConfig into env vars
|
|
if [ -z ${WRAPPED} ]; then
|
|
export WRAPPED=true
|
|
config run wrap -- $0
|
|
exit $?
|
|
fi
|
|
|
|
cat <<End-of-message
|
|
apiVersion: v1
|
|
kind: Service
|
|
metadata:
|
|
name: ${NAME}
|
|
labels:
|
|
app: nginx
|
|
instance: ${NAME}
|
|
spec:
|
|
ports:
|
|
- port: 80
|
|
targetPort: 80
|
|
name: http
|
|
selector:
|
|
app: nginx
|
|
instance: ${NAME}
|
|
---
|
|
apiVersion: apps/v1
|
|
kind: Deployment
|
|
metadata:
|
|
name: ${NAME}
|
|
labels:
|
|
app: nginx
|
|
instance: ${NAME}
|
|
spec:
|
|
replicas: ${REPLICAS}
|
|
selector:
|
|
matchLabels:
|
|
app: nginx
|
|
instance: ${NAME}
|
|
template:
|
|
metadata:
|
|
labels:
|
|
app: nginx
|
|
instance: ${NAME}
|
|
spec:
|
|
containers:
|
|
- name: nginx
|
|
image: nginx:1.7.9
|
|
ports:
|
|
- containerPort: 80
|
|
End-of-message
|
|
|
|
#### ` + "`" + `Dockerfile` + "`" + `
|
|
|
|
` + "`" + `Dockerfile` + "`" + ` installs ` + "`" + `kustomize config` + "`" + ` and copies the script into the container image.
|
|
|
|
FROM golang:1.13-stretch
|
|
RUN go get sigs.k8s.io/kustomize/cmd/config
|
|
RUN mv /go/bin/config /usr/bin/config
|
|
COPY nginx-template.sh /usr/bin/nginx-template.sh
|
|
CMD ["nginx-template.sh]
|
|
|
|
### Example Function Usage
|
|
|
|
Following is an example of running the ` + "`" + `kustomize config run` + "`" + ` using the preceding API.
|
|
|
|
#### ` + "`" + `nginx.yaml` + "`" + ` (Input)
|
|
|
|
` + "`" + `dir/nginx.yaml` + "`" + ` contains a reference to the Function. The contents of ` + "`" + `nginx.yaml` + "`" + `
|
|
are passed to the Function through the ` + "`" + `ResourceList.functionConfig` + "`" + ` field.
|
|
|
|
apiVersion: example.com/v1beta1
|
|
kind: Nginx
|
|
metadata:
|
|
name: my-instance
|
|
annotations:
|
|
config.kubernetes.io/local-config: "true"
|
|
configFn:
|
|
container:
|
|
image: gcr.io/example-functions/nginx-template:v1.0.0
|
|
spec:
|
|
replicas: 5
|
|
|
|
- ` + "`" + `configFn.container.image` + "`" + `: the image to use for this API
|
|
- ` + "`" + `annotations[config.kubernetes.io/local-config]` + "`" + `: mark this as not a Resource that should
|
|
be applied
|
|
|
|
#### ` + "`" + `kustomize config run dir/` + "`" + ` (Output)
|
|
|
|
` + "`" + `dir/my-instance_deployment.yaml` + "`" + ` contains the Deployment:
|
|
|
|
apiVersion: apps/v1
|
|
kind: Deployment
|
|
metadata:
|
|
name: my-instance
|
|
labels:
|
|
app: nginx
|
|
instance: my-instance
|
|
spec:
|
|
replicas: 5
|
|
selector:
|
|
matchLabels:
|
|
app: nginx
|
|
instance: my-instance
|
|
template:
|
|
metadata:
|
|
labels:
|
|
app: nginx
|
|
instance: my-instance
|
|
spec:
|
|
containers:
|
|
- name: nginx
|
|
image: nginx:1.7.9
|
|
ports:
|
|
- containerPort: 80
|
|
|
|
` + "`" + `dir/my-instance_service.yaml` + "`" + ` contains the Service:
|
|
|
|
apiVersion: v1
|
|
kind: Service
|
|
metadata:
|
|
name: my-instance
|
|
labels:
|
|
app: nginx
|
|
instance: my-instance
|
|
spec:
|
|
ports:
|
|
- port: 80
|
|
targetPort: 80
|
|
name: http
|
|
selector:
|
|
app: nginx
|
|
instance: my-instance`
|
|
|
|
var ConfigIoLong = `# Configuration IO API Semantics
|
|
|
|
Resource Configuration may be read / written from / to sources such as directories,
|
|
stdin|out or network. Tools may be composed using pipes such that the tools writing
|
|
Resource Configuration may be a different tool from the one that read the configuration.
|
|
In order for tools to be composed in this way, while preserving origin information --
|
|
such as the original file, index, etc.:
|
|
|
|
Tools **SHOULD** insert the following annotations when reading from sources,
|
|
and **SHOULD** delete the annotations when writing to sinks.
|
|
|
|
### ` + "`" + `config.kubernetes.io/path` + "`" + `
|
|
|
|
Records the slash-delimited, OS-agnostic, relative file path to a Resource.
|
|
|
|
This annotation **SHOULD** be set when reading Resources from files.
|
|
It **SHOULD** be unset when writing Resources to files.
|
|
When writing Resources to a directory, the Resource **SHOULD** be written to the corresponding
|
|
path relative to that directory.
|
|
|
|
Example:
|
|
|
|
metadata:
|
|
annotations:
|
|
config.kubernetes.io/path: "relative/file/path.yaml"
|
|
|
|
### ` + "`" + `config.kubernetes.io/index` + "`" + `
|
|
|
|
Records the index of a Resource in file. In a multi-object YAML file, Resources are separated
|
|
by three dashes (` + "`" + `---` + "`" + `), and the index represents the positon of the Resource starting from zero.
|
|
|
|
This annotation **SHOULD** be set when reading Resources from files.
|
|
It **SHOULD** be unset when writing Resources to files.
|
|
When writing multiple Resources to the same file, the Resource **SHOULD** be written in the
|
|
relative order matching the index.
|
|
|
|
When this annotation is not specified, it implies a value of ` + "`" + `0` + "`" + `.
|
|
|
|
Example:
|
|
|
|
metadata:
|
|
annotations:
|
|
config.kubernetes.io/path: "relative/file/path.yaml"
|
|
config.kubernetes.io/index: 2
|
|
|
|
This represents the third Resource in the file.
|
|
|
|
### ` + "`" + `config.kubernetes.io/local-config` + "`" + `
|
|
|
|
` + "`" + `config.kubernetes.io/local-config` + "`" + ` declares that the configuration is to local tools
|
|
rather than a remote Resource. e.g. The ` + "`" + `Kustomization` + "`" + ` config in a ` + "`" + `kustomization.yaml` + "`" + `
|
|
**SHOULD** contain this annotation so that tools know it is not intended to be sent to
|
|
the Kubernetes api server.
|
|
|
|
Example:
|
|
|
|
metadata:
|
|
annotations:
|
|
config.kubernetes.io/local-config: "true"`
|
|
|
|
var Merge2Long = `# Merge (2-way)
|
|
|
|
2-way merges fields from a source to a destination, overriding the destination fields
|
|
where they differ.
|
|
|
|
### Merge Rules
|
|
|
|
Fields are recursively merged using the following rules:
|
|
|
|
- scalars
|
|
- if present only in the dest, it keeps its value
|
|
- if present in the src and is non-null, take the src value -- if ` + "`" + `null` + "`" + `, clear it
|
|
- example src: ` + "`" + `5` + "`" + `, dest: ` + "`" + `3` + "`" + ` => result: ` + "`" + `5` + "`" + `
|
|
|
|
- non-associative lists -- lists without a merge key
|
|
- if present only in the dest, it keeps its value
|
|
- if present in the src and is non-null, take the src value -- if ` + "`" + `null` + "`" + `, clear it
|
|
- example src: ` + "`" + `[1, 2, 3]` + "`" + `, dest: ` + "`" + `[a, b, c]` + "`" + ` => result: ` + "`" + `[1, 2, 3]` + "`" + `
|
|
|
|
- map keys and fields -- paired by the map-key / field-name
|
|
- if present only in the dest, it keeps its value
|
|
- if present only in the src, it is added to the dest
|
|
- if the field is present in both the src and dest, and the src value is
|
|
` + "`" + `null` + "`" + `, the field is removed from the dest
|
|
- if the field is present in both the src and dest, the value is recursively merged
|
|
- example src: ` + "`" + `{'key1': 'value1', 'key2': 'value2'}` + "`" + `,
|
|
dest: ` + "`" + `{'key2': 'value0', 'key3': 'value3'}` + "`" + `
|
|
=> result: ` + "`" + `{'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}` + "`" + `
|
|
|
|
- associative list elements -- paired by the associative key
|
|
- if present only in the dest, it keeps its value in the list
|
|
- if present only in the src, it is added to the dest list
|
|
- if the field is present in both the src and dest, the value is recursively merged
|
|
|
|
### Associative Keys
|
|
|
|
Associative keys are used to identify "same" elements within 2 different lists, and merge them.
|
|
The following fields are recognized as associative keys:
|
|
|
|
[` + "`" + `mountPath` + "`" + `, ` + "`" + `devicePath` + "`" + `, ` + "`" + `ip` + "`" + `, ` + "`" + `type` + "`" + `, ` + "`" + `topologyKey` + "`" + `, ` + "`" + `name` + "`" + `, ` + "`" + `containerPort` + "`" + `]
|
|
|
|
Any lists where all of the elements contain associative keys will be merged as associative lists.
|
|
|
|
### Example
|
|
|
|
> Source
|
|
|
|
apiVersion: apps/v1
|
|
kind: Deployment
|
|
spec:
|
|
replicas: 3 # scalar
|
|
template:
|
|
spec:
|
|
containers: # associative list -- (name)
|
|
- name: nginx
|
|
image: nginx:1.7
|
|
command: ['new_run.sh', 'arg1'] # non-associative list
|
|
- name: sidecar2
|
|
image: sidecar2:v1
|
|
|
|
> Destination
|
|
|
|
apiVersion: apps/v1
|
|
kind: Deployment
|
|
spec:
|
|
replicas: 1
|
|
template:
|
|
spec:
|
|
containers:
|
|
- name: nginx
|
|
image: nginx:1.6
|
|
command: ['old_run.sh', 'arg0']
|
|
- name: sidecar1
|
|
image: sidecar1:v1
|
|
|
|
> Result
|
|
|
|
apiVersion: apps/v1
|
|
kind: Deployment
|
|
spec:
|
|
replicas: 3 # scalar
|
|
template:
|
|
spec:
|
|
containers: # associative list -- (name)
|
|
- name: nginx
|
|
image: nginx:1.7
|
|
command: ['new_run.sh', 'arg1'] # non-associative list
|
|
- name: sidecar1
|
|
image: sidecar1:v1
|
|
- name: sidecar2
|
|
image: sidecar2:v1`
|
|
|
|
var Merge3Long = `# Merge (3-way)
|
|
|
|
3-way merge identifies changes between an original source + updated source and merges the result
|
|
into a destination, overriding the destination fields where they have changed between
|
|
original and updated.
|
|
|
|
### Resource MergeRules
|
|
|
|
- Resources present in the original and deleted from the update are deleted.
|
|
- Resources missing from the original and added in the update are added.
|
|
- Resources present only in the dest are kept without changes.
|
|
- Resources present in both the update and the dest have their fields merged with the destination.
|
|
|
|
### Field Merge Rules
|
|
|
|
Fields are recursively merged using the following rules:
|
|
|
|
- scalars
|
|
- if present in either dest or updated and ` + "`" + `null` + "`" + `, clear the value
|
|
- if unchanged between original and updated, keep dest value
|
|
- if changed between original and updated (added, deleted, changed), take the updated value
|
|
|
|
- non-associative lists -- lists without a merge key
|
|
- if present in either dest or updated and ` + "`" + `null` + "`" + `, clear the value
|
|
- if unchanged between original and updated, keep dest value
|
|
- if changed between original and updated (added, deleted, changed), take the updated value
|
|
|
|
- map keys and fields -- paired by the map-key / field-name
|
|
- if present in either dest or updated and ` + "`" + `null` + "`" + `, clear the value
|
|
- if present only in the dest, it keeps its value
|
|
- if not-present in the dest, add the delta between original-updated as a field
|
|
- otherwise recursively merge the value between original, updated, dest
|
|
|
|
- associative list elements -- paired by the associative key
|
|
- if present only in the dest, it keeps its value
|
|
- if not-present in the dest, add the delta between original-updated as a field
|
|
- otherwise recursively merge the value between original, updated, dest
|
|
|
|
### Associative Keys
|
|
|
|
Associative keys are used to identify "same" elements within 2 different lists, and merge them.
|
|
The following fields are recognized as associative keys:
|
|
|
|
[` + "`" + `mountPath` + "`" + `, ` + "`" + `devicePath` + "`" + `, ` + "`" + `ip` + "`" + `, ` + "`" + `type` + "`" + `, ` + "`" + `topologyKey` + "`" + `, ` + "`" + `name` + "`" + `, ` + "`" + `containerPort` + "`" + `]
|
|
|
|
Any lists where all of the elements contain associative keys will be merged as associative lists.`
|