expect:"could not load provenance file testdata/testcharts/compressedchart-0.1.0.tgz.prov: stat testdata/testcharts/compressedchart-0.1.0.tgz.prov: no such file or directory",
expect:fmt.Sprintf("could not load provenance file testdata/testcharts/compressedchart-0.1.0.tgz.prov: %s testdata/testcharts/compressedchart-0.1.0.tgz.prov: %s",statExe,statFileMsg),
@ -9,6 +9,19 @@ Helm provides access to files through the `.Files` object. Before we get going w
- Files in `templates/` cannot be accessed.
- Charts to not preserve UNIX mode information, so file-level permissions will have no impact on the availability of a file when it comes to the `.Files` object.
<!-- (see https://github.com/jonschlinkert/markdown-toc) -->
<!-- toc -->
- [Basic example](#basic-example)
- [Path helpers](#path-helpers)
- [Glob patterns](#glob-patterns)
- [ConfigMap and Secrets utility functions](#configmap-and-secrets-utility-functions)
- [Secrets](#secrets)
- [Lines](#lines)
<!-- tocstop -->
## Basic example
With those caveats behind, let's write a template that reads three files into our ConfigMap. To get started, we will add three files to the chart, putting all three directly inside of the `mychart/` directory.
@ -67,11 +80,29 @@ data:
message = Goodbye from config 3
```
## Path helpers
When working with files, it can be very useful to perform some standard
operations on the file paths themselves. To help with this, Helm imports many of
the functions from Go's [path](https://golang.org/pkg/path/) package for your
use. They are all accessible with the same names as in the Go package, but
with a lowercase first letter. For example, `Base` becomes `base`, etc.
The imported functions are:
- Base
- Dir
- Ext
- IsAbs
- Clean
## Glob patterns
As your chart grows, you may find you have a greater need to organize your
files more, and so we provide a `Files.Glob(pattern string)` method to assist
in extracting certain files with all the flexibility of [glob patterns](//godoc.org/github.com/gobwas/glob).
in extracting certain files with all the flexibility of [glob patterns](https://godoc.org/github.com/gobwas/glob).
`.Glob` returns a `Files` type, so you may call any of the `Files` methods on
the returned object.
For example, imagine the directory structure:
@ -101,6 +132,36 @@ Or
{{ end }}
```
## ConfigMap and Secrets utility functions
(Not present in version 2.0.2 or prior)
It is very common to want to place file content into both configmaps and
secrets, for mounting into your pods at run time. To help with this, we provide a
couple utility methods on the `Files` type.
For further organization, it is especially useful to use these methods in
conjunction with the `Glob` method.
Given the directory structure from the [Glob][Glob patterns] example above:
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: conf
data:
{{ (.Files.Glob "foo/*").AsConfig | indent 2 }}
---
apiVersion: v1
kind: Secret
metadata:
name: very-secret
type: Opaque
data:
{{ (.Files.Glob "bar/*").AsSecrets | indent 2 }}
```
## Secrets
When working with a Secret resource, you can import a file and have the template base-64 encode it for you:
@ -130,6 +191,17 @@ data:
bWVzc2FnZSA9IEhlbGxvIGZyb20gY29uZmlnIDEK
```
## Lines
Sometimes it is desireable to access each line of a file in your template. We
provide a convenient `Lines` method for this.
```yaml
data:
some-file.txt: {{ range .Files.Lines "foo/bar.txt" }}
{{ . }}{{ end }}
```
Currently, there is no way to pass files external to the chart during `helm install`. So if you are asking users to supply data, it must be loaded using `helm install -f` or `helm install --set`.
This discussion wraps up our dive into the tools and techniques for writing Helm templates. In the next section we will see how you can use one special file, `templates/NOTES.txt`, to send post-installation instructions to the users of your chart.
See this issue for more information: https://github.com/kubernetes/helm/issues/1455
**Q: On GKE (Google Container Engine) I get "No SSH tunnels currently open"**
```
Error: Error forwarding ports: error upgrading connection: No SSH tunnels currently open. Were the targets able to accept an ssh-key for user "gke-[redacted]"?
```
Another variation of the error message is:
```
Unable to connect to the server: x509: certificate signed by unknown authority
```
A: The issue is that your local Kubernetes config file must have the correct credentials.
When you create a cluster on GKE, it will give you credentials, including SSL
certificates and certificate authorities. These need to be stored in a Kubernetes
config file (Default: `~/.kube/config` so that `kubectl` and `helm` can access
them.
**Q: When I run a Helm command, I get an error about the tunnel or proxy**
A: Helm uses the Kubernetes proxy service to connect to the Tiller server.
If the command `kubectl proxy` does not work for you, neither will Helm.
Typically, the error is related to a missing `socat` service.
## Upgrading
My Helm used to work, then I upgrade. Now it is broken.
Nikolay Mahotkin
8 years ago
committed by
GitHub