README.md documentation

Better document the possible shortcomings with ReplicaSet than
disabling them alltogether. This README.md had to be written anyway.

README.md

@@ -3,17 +3,102 @@
 [![Build Status](https://travis-ci.org/bpineau/katafygio.svg?branch=master)](https://travis-ci.org/bpineau/katafygio)
 [![Go Report Card](https://goreportcard.com/badge/github.com/bpineau/katafygio)](https://goreportcard.com/report/github.com/bpineau/katafygio)
 
-Discover and dynamicaly backup Kubernetes objects (deployments, configmaps, ...).
+katafygio discovers Kubernetes objects (deployments, services, ...),
+and continuously save them as yaml files in a git repository.
+This provides both real time, continuous backups, and changes history.
 
-NOT YET READY.
+## Usage
+
+```bash
+katafygio --git-url https://user:[email protected]/myorg/myrepos.git --local-dir /tmp/kfdump
+```
+
+The remote git url is optional: if not specified, katafygio will create a local
+repository in the target dump directory. katafygio may be used that way to
+quickly dump a cluster's content.
+
+Filtering out irrelevant objects (esp. ReplicaSets and Pods) with `-x` and `-y`
+will help to keep memory usage low. Same for low value and frequently changing
+objects, that may bloat the git history.
+
+
+```bash
+# Filtering out replicasets and pods since they are managed by Deployments
+# (already archived), secrets to keep them confidential, and the leader-elector
+# configmap that has low value and changes a lot, causing commits churn.
+
+katafygio \
+  -g https://user:[email protected]/myorg/myrepos.git -e /tmp/kfdump \
+  -x secret -x pod -x replicaset -y configmap:kube-system/leader-elector
+```
+
+## Supported resources
+
+katafygio will discover and save most Kubernetes objects (except CRD).
+The supported objects kinds are:
+
+* clusterrolebinding
+* configmap
+* controllers.go
+* cronjob
+* daemonset
+* deployment
+* horizontalpodautoscaler
+* ingress
+* job
+* limitrange
+* namespace
+* networkpolicy
+* persistentvolume
+* persistentvolumeclaim
+* pod
+* poddisruptionbudget
+* podsecuritypolicy
+* podtemplate
+* replicaset
+* replicationcontroller
+* resourcequota
+* rolebinding
+* secret
+* service
+* serviceaccount
+* statefulset
+* storageclass
+
+
+## CLI options
+
+```
+Flags:
+  -s, --api-server string            Kubernetes api-server url
+  -c, --config string                Configuration file (default "/etc/katafygio/katafygio.yaml")
+  -d, --dry-run                      Dry-run mode: don't store anything.
+  -x, --exclude-kind stringSlice     Ressource kind to exclude. Eg. 'deployment' (can be specified several times)
+  -y, --exclude-object stringSlice   Object to exclude. Eg. 'configmap:kube-system/kube-dns' (can be specified several times)
+  -l, --filter string                Label filter. Select only objects matching the label.
+  -g, --git-url string               Git repository URL
+  -P, --healthcheck-port int         Port for answering healthchecks
+  -h, --help                         help for katafygio
+  -k, --kube-config string           Kubernetes config path
+  -e, --local-dir string             Where to dump yaml files (default "./kubernetes-backup")
+  -v, --log-level string             Log level (default "info")
+  -o, --log-output string            Log output (default "stderr")
+  -r, --log-server string            Log server (if using syslog)
+  -i, --resync-interval int          Resync interval in seconds (0 to disable) (default 300)
+```
 
 ## Build
 
-Assuming you have go 1.9 and glide in the path, and GOPATH configured:
+Assuming you have go 1.10 and glide in the path, and GOPATH configured:
 
 ```shell
 make deps
 make build
 ```
 
+## See Also
+
+* [Heptio Ark](https://github.com/heptio/ark) does sophisticated clusters backups, including volumes
+* [Stash](https://github.com/appscode/stash) backups volumes
+* [etcd backup operator](https://coreos.com/operators/etcd/docs/latest/user/walkthrough/backup-operator.html)
 

main.go

@@ -24,6 +24,7 @@ import (
 	_ "github.com/bpineau/katafygio/pkg/controllers/poddisruptionbudget"
 	_ "github.com/bpineau/katafygio/pkg/controllers/podsecuritypolicy"
 	_ "github.com/bpineau/katafygio/pkg/controllers/podtemplate"
+	_ "github.com/bpineau/katafygio/pkg/controllers/replicaset"
 	_ "github.com/bpineau/katafygio/pkg/controllers/replicationcontroller"
 	_ "github.com/bpineau/katafygio/pkg/controllers/resourcequota"
 	_ "github.com/bpineau/katafygio/pkg/controllers/rolebinding"
@@ -32,9 +33,6 @@ import (
 	_ "github.com/bpineau/katafygio/pkg/controllers/serviceaccount"
 	_ "github.com/bpineau/katafygio/pkg/controllers/statefulset"
 	_ "github.com/bpineau/katafygio/pkg/controllers/storageclass"
-	// ReplicaSets may consume a lot of memory, and is already subsumed
-	// by Deployments (does anybody creates naked ReplicaSets by hand ?).
-	//_ "github.com/bpineau/katafygio/pkg/controllers/replicaset"
 )
 
 //var privateExitHandler func(code int) = os.Exit