rancher-gen 0.2.0

File generator that renders templates using Rancher API

```
8888888b. 888 .d8888b.
888 Y88b 888 d88P Y88b
888 888 888 888 888
888 d88P 8888b. 88888b. .d8888b 88888b. .d88b. 888d888 888 .d88b. 88888b.
8888888P" "88b 888 "88b d88P" 888 "88b d8P Y8b 888P" 888 88888 d8P Y8b 888 "88b
888 T88b .d888888 888 888 888 888 888 88888888 888 888888 888 888 88888888 888 888
888 T88b 888 888 888 888 Y88b. 888 888 Y8b. 888 Y88b d88P Y8b. 888 888
888 T88b "Y888888 888 888 "Y8888P 888 888 "Y8888 888 "Y8888P88 "Y8888 888 888
```

File generator that renders templates using Rancher API. Inspired by
[docker-gen](https://github.com/jwilder/docker-gen).

This program listens for changes on Rancher services and renders a
[Jinja2](http://jinja.pocoo.org/docs/dev/) template. It also has the ability
no run a notification command after the template has been rendered. This could
be useful for generating configuration files for services like Nginx.

## Installation

pip install rancher-gen


## How to use rancher-gen

```
usage: rancher-gen [--host HOST] [--port PORT] [--access-key ACCESS_KEY]
[--secret-key SECRET_KEY] [--project-id PROJECT_ID] [-h]
[--log-level {DEBUG,INFO,WARNING,CRITICAL,ERROR}]
[--stack STACK] [--service SERVICE] [--ssl]
[--notify NOTIFY]
template dest

Generate files from rancher meta-data

positional arguments:
template Path to template to generate
dest Output path for generated file

named arguments:
--host HOST Rancher host (defaults to localhost)
--port PORT Rancher port (defaults to 80 or 443 if ssl is
specified)
--access-key ACCESS_KEY
The Rancher access key
--secret-key SECRET_KEY
The Rancher secret key
--project-id PROJECT_ID
Rancher's project id

optional arguments:
-h, --help show this help message and exit
--log-level {DEBUG,INFO,WARNING,CRITICAL,ERROR}
Set the log level.
--stack STACK The name of the rancher stack
--service SERVICE The name of the rancher service
--ssl User secure connections (https and wss)
--notify NOTIFY Command to run after template is generated (e.g
restart some-service)

```

In order to run rancher-gen, you must specify at least the following parameters:
* host: The ip/dns name of the rancher server.
* port: The port of the rancher server. It defaults to 80 or 443 for SSL.
* access-key: The access key to access the Rancher server.
* secret-key: The secret key to access the Rancher server.
* proejct-id: The project id (environment) from Rancher.

## What's passed to the templates
A list of container instances is passed to the template when is rendered. So,
you can do something like:

{% for container in containers %}
{{container['primaryIpAddress']}}
{% endfor %}

### Example of container data that is being passed to the template

```
{
"id": "1i258",
"type": "container",
"links": {
"self": "…/v1/projects/1a5/containers/1i258",
"account": "…/v1/projects/1a5/containers/1i258/account",
"credentials": "…/v1/projects/1a5/containers/1i258/credentials",
"healthcheckInstanceHostMaps": "…/v1/projects/1a5/containers/1i258/healthcheckinstancehostmaps",
"hosts": "…/v1/projects/1a5/containers/1i258/hosts",
"instanceLabels": "…/v1/projects/1a5/containers/1i258/instancelabels",
"instanceLinks": "…/v1/projects/1a5/containers/1i258/instancelinks",
"instances": "…/v1/projects/1a5/containers/1i258/instances",
"mounts": "…/v1/projects/1a5/containers/1i258/mounts",
"ports": "…/v1/projects/1a5/containers/1i258/ports",
"serviceEvents": "…/v1/projects/1a5/containers/1i258/serviceevents",
"serviceExposeMaps": "…/v1/projects/1a5/containers/1i258/serviceexposemaps",
"services": "…/v1/projects/1a5/containers/1i258/services",
"targetInstanceLinks": "…/v1/projects/1a5/containers/1i258/targetinstancelinks",
"volumes": "…/v1/projects/1a5/containers/1i258/volumes",
"stats": "…/v1/projects/1a5/containers/1i258/stats",
"containerStats": "…/v1/projects/1a5/containers/1i258/containerstats",
},
"actions": {
"update": "…/v1/projects/1a5/containers/1i258/?action=update",
"stop": "…/v1/projects/1a5/containers/1i258/?action=stop",
"restart": "…/v1/projects/1a5/containers/1i258/?action=restart",
"migrate": "…/v1/projects/1a5/containers/1i258/?action=migrate",
"logs": "…/v1/projects/1a5/containers/1i258/?action=logs",
"setlabels": "…/v1/projects/1a5/containers/1i258/?action=setlabels",
"execute": "…/v1/projects/1a5/containers/1i258/?action=execute",
"proxy": "…/v1/projects/1a5/containers/1i258/?action=proxy",
},
"name": "foo_nginx2_1",
"state": "running",
"accountId": "1a5",
"blkioDeviceOptions": null,
"build": null,
"capAdd": null,
"capDrop": null,
"command": null,
"cpuSet": null,
"cpuShares": null,
"createIndex": 1,
"created": "2016-09-07T01:37:19Z",
"createdTS": 1473212239000,
"dataVolumeMounts": {},
"dataVolumes": [
"/tmp/nginxconf:/nginxconf",
],
"dataVolumesFrom": null,
"deploymentUnitUuid": "e4af719b-39ad-4576-8402-8a29a6ec97d6",
"description": null,
"devices": null,
"dns": [
"169.254.169.250",
],
"dnsSearch": [
3items"foo.rancher.internal",
"nginx2.foo.rancher.internal",
"rancher.internal",
],
"domainName": null,
"entryPoint": null,
"environment": {
"NGINX_RUN_TYPE": "rancher-gen",
"RANCHER_GEN_ACCESS_KEY": "37AF1F5CD18843DF00CC",
"RANCHER_GEN_HOST": "192.168.0.15",
"RANCHER_GEN_OPTIONS": "--port 8080 --stack foo --service hello",
"RANCHER_GEN_PROJECT_ID": "1a5",
"RANCHER_GEN_SECRET_KEY": "7D7Bio7bcK1vGbj5jNGVCnAEZFrnmZXPjaEZ8Fs2",
},
"expose": null,
"externalId": "f61757f4ede26d6bbbb2ddc31aa8b17dd4227a3bbca12225ddab66e77d76971d",
"extraHosts": null,
"firstRunning": "2016-09-07T01:37:20Z",
"firstRunningTS": 1473212240000,
"healthCheck": null,
"healthState": null,
"hostId": "1h2",
"hostname": null,
"imageUuid": "docker:pitrho/nginx:dev",
"kind": "container",
"labels": {
"io.rancher.project.name": "foo",
"io.rancher.service.deployment.unit": "e4af719b-39ad-4576-8402-8a29a6ec97d6",
"io.rancher.service.launch.config": "io.rancher.service.primary.launch.config",
"io.rancher.project_service.name": "foo/nginx2",
"io.rancher.stack.name": "foo",
"io.rancher.stack_service.name": "foo/nginx2",
"io.rancher.service.hash": "ddf05372f057253876d50b81c26eb1a350438d49",
"io.rancher.container.uuid": "90028a61-6fd5-460a-a8b7-f90bcaf664f2",
"io.rancher.container.name": "foo_nginx2_1",
"io.rancher.container.ip": "10.42.172.71/16",
},
"logConfig": {},
"lxcConf": null,
"memory": null,
"memorySwap": null,
"nativeContainer": false,
"networkContainerId": null,
"networkMode": "managed",
"pidMode": null,
"ports": [
"80:80/tcp",
],
"primaryIpAddress": "10.42.172.71",
"privileged": false,
"publishAllPorts": false,
"readOnly": false,
"registryCredentialId": null,
"removed": null,
"requestedHostId": null,
"restartPolicy": null,
"securityOpt": null,
"startCount": 1,
"startOnCreate": true,
"stdinOpen": false,
"systemContainer": null,
"transitioning": "no",
"transitioningMessage": null,
"transitioningProgress": null,
"tty": false,
"user": null,
"uuid": "90028a61-6fd5-460a-a8b7-f90bcaf664f2",
"version": "0",
"volumeDriver": null,
"workingDir": null,
}
```


## Examples

### Listening for changes at the project level

rancher-gen --host rancher.mycompany.com --port 8080 --access-key 1234567890 --secret-key 123ABC456DEF789GHI --project-id 1a5 /tmp/template.j2 /tmp/output.txt

### Listening for changes at the stack level

rancher-gen --host rancher.mycompany.com --port 8080 --access-key 1234567890 --secret-key 123ABC456DEF789GHI --project-id 1a5 --stack mystack /tmp/template.j2 /tmp/output.txt

### Listening for changes at the service level

rancher-gen --host rancher.mycompany.com --port 8080 --access-key 1234567890 --secret-key 123ABC456DEF789GHI --project-id 1a5 --stack mystack --service myservice /tmp/template.j2 /tmp/output.txt

### Using secure connections

rancher-gen --host rancher.mycompany.com --access-key 1234567890 --secret-key 123ABC456DEF789GHI --project-id 1a5 --stack mystack --service myservice --ssl /tmp/template.j2 /tmp/output.txt

### Creating nginx config and reloading (notify)

rancher-gen --host rancher.mycompany.com --port 8080 --access-key 1234567890 --secret-key 123ABC456DEF789GHI --project-id 1a5 --stack mystack --service myservice --ssl --notify "service nginx reload" /tmp/default.tmpl /etc/nginx/sites-enabled/default

## License
MIT