Are you an appops?
Do you want to run microservices-style Kubernetes applications in a simple and convenient way? Is the
kubectl interface too low-level and feels sorta cumbersome to use?
If you found yourself answering one of the above questions with a Yes, then read on.
The basic idea of kploy is to deploy and manage an app based on a collection of manifest files, such as Kubernetes service or replication controller manifests. With kploy you simply set up your app deployment descriptor and use convention over configuration in order to manage your app across the entire lifecycle.
For a quick overview, check out the walkthrough example and have a look at the following screen cast:
You'll need Python 2.6 or above and then you can install kploy simply like so:
git clone https://github.com/kubernauts/kploy.git && cd kploy
kploy assumes that you have access to a Kubernetes cluster. It does not help you in setting one up.
Note that if you're experiencing authentication issues you can use
kubectl proxy --port=8080 &
apiserver: http://localhost:8080 in the Kployfile.
init command to create the required scaffolding:
$ ./kploy init ================================================================================ OK, I've set up the Kployfile deployment file and created necessary directories. Now edit the deployment file and copy manifests into the respective directories. $ ls -al drwxr-xr-x 10 mhausenblas staff 748B 13 Dec 17:41 . drwxr-xr-x 23 mhausenblas staff 816B 5 Dec 07:44 .. -rw-r--r-- 1 mhausenblas staff 85B 13 Dec 17:41 Kployfile drwxr-xr-x 2 mhausenblas staff 68B 13 Dec 17:41 rcs drwxr-xr-x 2 mhausenblas staff 68B 13 Dec 17:41 services $ cat Kployfile apiserver: http://localhost:8080 author: CHANGE_ME cache_remotes: False name: CHANGE_ME namespace: default source: CHANGE_ME
In the above Kployfile, change at least the
apiserver field to point it to the API Server of your Kubernetes cluster.
Alternatively, you can create an app from an existing archive. By convention the ZIP archive must be called
app.kploy in order to be recognized when you execute the
$ ls -al drwxr-xr-x 8 mhausenblas staff 714B 22 Dec 13:28 . drwxr-xr-x 6 mhausenblas staff 238B 21 Dec 13:58 .. -rw-r--r-- 1 mhausenblas staff 1.0K 22 Dec 12:10 app.kploy $ ./kploy init -v 2015-12-22T01:40:49 Detected archive /Users/mhausenblas/Documents/repos/kubernauts/kploy/app.kploy ================================================================================ OK, I've set up the deployment from archive. You can now validate it with `kploy dryrun` $ ls -al drwxr-xr-x 8 mhausenblas staff 714B 22 Dec 13:40 . drwxr-xr-x 6 mhausenblas staff 238B 21 Dec 13:58 .. -rw-r--r-- 1 mhausenblas staff 174B 22 Dec 13:40 Kployfile -rw-r--r-- 1 mhausenblas staff 1.0K 22 Dec 12:10 app.kploy drwxr-xr-x 2 mhausenblas staff 102B 22 Dec 13:40 rcs drwxr-xr-x 2 mhausenblas staff 102B 22 Dec 13:40 services
To validate your deployment use the
$ ./kploy dryrun Validating application `myns/simple_app` ... CHECK: Is the Kubernetes cluster up & running and accessible via `http://18.104.22.168/service/kubernetes`? \o/ ... I found 1 node(s) to deploy your wonderful app onto. CHECK: Are there RC and service manifests available around here? I found 1 RC manifest(s) in /Users/mhausenblas/Documents/repos/mhausenblas/kploy/rcs I found 1 service manifest(s) in /Users/mhausenblas/Documents/repos/mhausenblas/kploy/services \o/ ... I found both RC and service manifests to deploy your wonderful app! ================================================================================ OK, we're looking good! You're ready to deploy your app with `kploy run` now :)
Looks fine, so to actually deploy your app, do:
$ ./kploy run 2015-12-14T10:34:45 From /Users/mhausenblas/Documents/repos/mhausenblas/kploy/services/webserver-svc.yaml I created the service "webserver-svc" at /api/v1/namespaces/default/services/webserver-svc 2015-12-14T10:34:46 From /Users/mhausenblas/Documents/repos/mhausenblas/kploy/rcs/nginx-webserver-rc.yaml I created the RC "webserver-rc" at /api/v1/namespaces/default/replicationcontrollers/webserver-rc ================================================================================ OK, I've deployed `simple_app`. Use `kploy list` to check how it's doing.
There you go, you just deployed an app on Kubernetes, with a single command. Well done!
You can also use URLs rather than manifests themselves: kploy will download these so called
remotes and via
cache_remotes in the Kployfile you can control when this should take place.
The `cache_remotes` flag only applies to the `run` command, that is, all other commands such as `dryrun` or `list` will always work with the cached manifests.
$ echo https://raw.githubusercontent.com/helm/charts/master/elasticsearch/manifests/elasticsearch-rc.yaml > rcs/elasticsearch-rc.yaml.url
Note that when
kploy run is executed, the resources are marked with the additional label
This label allows us to identify resources (RCs and services) that are managed by kploy. Do not manually remove them.
If you need to pass confidential data such as passwords or API keys to one of your services, just let kploy handle it automagically via its env mechanism: read more about it in the Secrets section of the env doc.
To see how your app is doing, use the
list command. All services and RCs of the app will be listed, along with their status
online means it’s deployed and running) and their resource URL:
$ ./kploy list Resources of app `myns/simple_app`: NAME MANIFEST TYPE STATUS URL webserver-svc services/webserver-svc.yaml service online http://ma.dcos.ca1.mesosphere.com/service/kubernetes/api/v1/namespaces/default/services/webserver-svc webserver-rc rcs/nginx-webserver-rc.yaml RC online http://ma.dcos.ca1.mesosphere.com/service/kubernetes/api/v1/namespaces/default/replicationcontrollers/webserver-rc
Hint: if you want to learn about any of the supported commands, simply add an
explain before the command, for example:
$ ./kploy explain list list: Lists apps and their status.
If you want to learn more about how your app uses the cluster, use the
$ ./kploy stats Runtime stats for app `myns/simple_app`: [Your app's pods] NAME HOST STATUS URL webserver-rc-29pxj 22.214.171.124 Running http://ma.dcos.ca1.mesosphere.com/service/kubernetes/api/v1/namespaces/default/pods/webserver-rc-29pxj ================================================================================ [Nodes used by your app] IP HOST OS CONTAINER RUNTIME CAPACITY (PODS, CPU, MEM) URL 126.96.36.199 CentOS Linux 7 (Core) docker://1.8.2 40, 40, 256708Mi http://ma.dcos.ca1.mesosphere.com/service/kubernetes/api/v1/nodes/188.8.131.52 ================================================================================
To scale one of the RCs of your app, use the
scale command as described in
the Scale section of the dev & ops doc.
Should you need to do some troubleshooting on the Pod-level, use the
debug command as described in
the Debugging section of the dev & ops doc.
To tear down your app, use the
destroy command, for example:
$ ./kploy destroy 2015-12-14T10:23:42 Deleted resource /api/v1/namespaces/default/services/webserver-svc 2015-12-14T10:23:42 Deleted resource /api/v1/namespaces/default/replicationcontrollers/webserver-rc ================================================================================ OK, I've destroyed `myns/simple_app`
To share your app, you can make a snapshot of your app using the
export command. This creates an archive called
app.kploy that you can use in turn with the
init command to create the app in a different location.
$ ./kploy export -v 2015-12-22T01:47:18 Exporting app based on content from /Users/mhausenblas/Documents/repos/kubernauts/kploy Adding content of app `myns/simple_app` to app.kploy
You can store a snapshot of your app using the
push command and restore it using
What happens under the cover is that kploy exports your app (just as with the
and then stores the archive in the kploy application registry.
$ ./kploy push Adding content of app `default/kploy2` to /Users/mhausenblas/Documents/repos/kubernauts/kploy/.app.kploy Using https://github.com/kubernauts/kploy as the app's workspace ================================================================================ OK, I've successfully pushed the app archive to the registry: http://registry.kploy.net/api/v1/app/bca0965d2335ab87d806a2982b132adb80d35a42d815a5bb4d9fe27aa81a3a66?workspace=https://github.com/kubernauts/kploy To list the available app(s), use the `kploy pull` command.
To restore the app, use
pull. First you'd usually list available versions:
$ ./kploy pull Using https://github.com/kubernauts/kploy as the app's workspace TIMESTAMP ID SIZE 2016-01-04T12:43:13.545Z 7983b3dd7b38f2fb82d195eed7f78dcc1ac37de84a31f4bdf305bdb9d7e019f2 1017 2016-01-04T12:43:07.917Z bca0965d2335ab87d806a2982b132adb80d35a42d815a5bb4d9fe27aa81a3a66 1017 2016-01-04T12:42:52.455Z e832dbb5f60ad653033edf7b5fa5a573d43322a79c74841019344892b49c8303 1017 2016-01-04T12:41:12.557Z adea1abd8d0b03a024e927c978b54010c5315d1e5c4f694b51561b10c5a6c2a2 1016 ================================================================================ OK, I've successfully pulled from the registry. You can now `kploy pull $ID` to download and init an app. WARNING: a `kploy pull $ID` will overwrite whatever you had locally.
You'd then use
pull again to pull a certain versions (note: most recent is at the top of the list):
$ ./kploy pull adea1abd8d0b03a024e927c978b54010c5315d1e5c4f694b51561b10c5a6c2a2 Using https://github.com/kubernauts/kploy as the app's workspace ================================================================================ OK, I've set up the app from archive. You can now validate it with `kploy dryrun`
Note that in order for
pull to work you MUST have the
field in the Kployfile set to either a GitHub username URL or project URL. For example,
https://github.com/kubernauts/kploy are valid.