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Merge pull request openshift#15 from ravisantoshgudimetla/add-wmb-ske…
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[wmcb] code skeleton structure
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aravindhp authored Sep 12, 2019
2 parents 20c7064 + 845b1a7 commit 225eeba
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12 changes: 12 additions & 0 deletions Makefile
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all: build

PACKAGE=github.com/openshift/windows-machine-config-operator
MAIN_PACKAGE=$(PACKAGE)/cmd/bootstrapper

GO_BUILD_ARGS=CGO_ENABLED=0 GO111MODULE=on

# TODO: Pin go versions

.PHONY: build
build:
$(GO_BUILD_ARGS) go build -o wmcb $(MAIN_PACKAGE)
32 changes: 32 additions & 0 deletions cmd/bootstrapper/main.go
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package main

import (
"flag"

"github.com/spf13/cobra"
logger "sigs.k8s.io/controller-runtime/pkg/runtime/log"
)

const (
componentName = "wmcb" // wmcb is the name of the binary
)

var (
rootCmd = &cobra.Command{
Use: componentName,
Short: "Run Windows machine config bootstrapper",
Long: "Runs the Machine Config Bootstrapper which is responsible for bootstrapping the windows to ensure that" +
"the node can join existing OpenShift cluster",
}
log = logger.Log.WithName("wmcb")
)

func init() {
rootCmd.PersistentFlags().AddGoFlagSet(flag.CommandLine)
}

func main() {
if err := rootCmd.Execute(); err != nil {
log.Error(err, "wmcb execution failed")
}
}
40 changes: 40 additions & 0 deletions cmd/bootstrapper/start.go
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package main

import (
"flag"

"github.com/openshift/windows-machine-config-operator/pkg/bootstrapper"
"github.com/spf13/cobra"
)

var (
startCmd = &cobra.Command{
Use: "start",
Short: "Starts Windows Machine Config Bootstrapper",
Long: "",
Run: runStartCmd,
}

startOpts struct {
// The location of the ignition file
ignitionFile string
// The location where the kubelet.exe has been downloaded to
kubeletPath string
}
)

func init() {
rootCmd.AddCommand(startCmd)
startCmd.PersistentFlags().StringVar(&startOpts.ignitionFile, "ignition-file", "",
"Ignition file location to bootstrap the windows node")
startCmd.PersistentFlags().StringVar(&startOpts.kubeletPath, "kubelet-path", "",
"Kubelet file location to bootstrap the windows node")
}

// runStartCmd starts the windows machine config bootstrapper
func runStartCmd(cmd *cobra.Command, args []string) {
flag.Set("logtostderr", "true")
flag.Parse()
// TODO: add validation for flags
bootstrapper.NewWinNodeBootstrapper(startOpts.ignitionFile, startOpts.kubeletPath)
}
10 changes: 10 additions & 0 deletions docs/README.md
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# Windows Machine Config Bootstrapper

Bootstrapper is the entity responsible for bootstrapping a Windows node. The current scope of this component is to
perform an one shot configuration of the Windows node to ensure that it can be become a worker node. Following are the
jobs that the bootstrapper does:
- Parse the worker ignition file to get the bootstrap kubeconfig
- Ensures that the kubelet gets the correct kubelet config
- Run the kubelet as a windows service

This will be remotely invoked from a Ansible script or can be run locally
8 changes: 8 additions & 0 deletions go.mod
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module github.com/openshift/windows-machine-config-operator

go 1.12

require (
github.com/spf13/cobra v0.0.5
sigs.k8s.io/controller-runtime v0.2.1
)
129 changes: 129 additions & 0 deletions go.sum
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47 changes: 47 additions & 0 deletions pkg/bootstrapper/node_bootstrapper.go
Original file line number Diff line number Diff line change
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package bootstrapper

/*
Bootstrapper is the entity responsible for bootstrapping a Windows node. The current scope of this component is to
perform an one shot configuration of the Windows node to ensure that it can be become a worker node. Following
are the jobs that the bootstrapper does:
- Parse the worker ignition file to get the bootstrap kubeconfig
- Ensures that the kubelet gets the correct kubelet config
- Run the kubelet as a windows service
This will be remotely invoked from a Ansible script or can be run locally
*/

// winNodeBoostrapper is responsible for bootstrapping and ensuring kubelet runs as a windows service
type winNodeBootstrapper struct {
// kubeconfigPath is the file path of the node bootstrap kubeconfig
kubeConfigPath string
// kubeletConf is the file path of the kubelet configuration
kubeletConfPath string
// TODO: Add some more fields as deemed necessary. Some examples are monitoring windows service
}

// NewWinNodeBootstrapper takes ignitionFile and kubeletPath as inputs and generates the winNodeBootstrapper object
func NewWinNodeBootstrapper(ignitionFile, kubeletPath string) *winNodeBootstrapper {
// TODO: Parse the ignition file here and get the kubeconfig and kubeletconf
return &winNodeBootstrapper{
kubeConfigPath: "",
kubeletConfPath: "",
}
}

// parseIgnitionFile parses the ignition file and returns the contents of kubeconfig and kubelet config
func parseIgnitionFile() (string, string) {
// Parses the ignition file
return "", ""
}

// Initializes the kubelet after copying the kubelet to the desired location
func (wcb *winNodeBootstrapper) initializeKubelet() (bool, error) {
return false, nil
}

// Start kubelet as a Windows service to ensure that kubelet is automatically started when it fails
func (wcb *winNodeBootstrapper) startKubeletService() bool {
return false
}

// TODO: Add other functions as deemed necessary

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