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diff --git a/content/blog/2022-v0.7-released.md b/content/blog/2022-v0.7-released.md index 8c34703..be2939a 100644 --- a/content/blog/2022-v0.7-released.md +++ b/content/blog/2022-v0.7-released.md @@ -1,5 +1,5 @@ +++ -title="Garage v0.7: a tour of the new features" +title="Garage v0.7: Kubernetes and OpenTelemetry" date=2022-04-04 +++ @@ -11,17 +11,192 @@ date=2022-04-04 Two months ago, we were impressed by the success of our open beta launch at the FOSDEM and on Hacker News: [our intial post](https://garagehq.deuxfleurs.fr/blog/2022-introducing-garage/) lead to more than 40k views in 10 days, going up to 100 views/minute. Since this event, we continued improving Garage, and 2 months after the initial release, we are happy to announce a new version: v0.7.0. -We would like to thank all the contributors that made this new release possible: Alex, Jill, Max Audron, Maximilien, Quentin, Rune Henrisken, Steam, and trinity-1686a. -This is also for the first time for Garage that we have contributions from outside of our organization: we are very proud and we want to renew our commitment to foster an open community around Garage. +Before all, we would like to thank all the contributors that made this new release possible: Alex, Jill, Max Audron, Maximilien, Quentin, Rune Henrisken, Steam, and trinity-1686a. +This is also the first time for Garage that we have contributions from the outside: we are very happy as we want to build a community-driven project. If you want to test this new version, you have 2 solutions: using our binaries or the ones from your OS. We ship [statically compiled binaries](https://garagehq.deuxfleurs.fr/download/) for Linux (amd64, i386, aarch64 and armv6) and their associated [Docker containers](https://hub.docker.com/u/dxflrs). Garage is also packaged by some OS/distributions, we are currently aware of [FreeBSD](https://cgit.freebsd.org/ports/tree/www/garage/Makefile) and [AUR for Arch Linux](https://aur.archlinux.org/packages/garage). Feel free to [reach us](mailto:garagehq@deuxfleurs.fr) if you are packaging or planning to package Garage, we are willing to adapt our software to make packaging easier and we plan to reference your work in our documentation. -Obviously, this new version includes many bug fixes that are listed in our [changelogs](https://git.deuxfleurs.fr/Deuxfleurs/garage/releases), but also 2 new features: Kubernetes integration and OpenTelemetry support, we review them in the following. + +Speaking about the changes of this new version, it obviously includes many bug fixes. +We listed them in our [changelogs](https://git.deuxfleurs.fr/Deuxfleurs/garage/releases), take a look, we might have fixed something that annoyed you! +In this blog post, we want to introduce you to another aspect of this new release, its 2 new features: a better Kubernetes integration and support for OpenTelemetry. ## Kubernetes integration +Before Garage v0.7.0, you had to deploy a Consul cluster or spawn a coordinating pod to deploy Garage on Kubernetes. +In this new version, Garage integrates a method to discover other peers by using Kubernetes [Custom Resources](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/) to ease your deployments. +Garage is even able to automatically create the [Custom Resource Definition](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/) (CRD) before using it to discover other peers. + +Let's see practically how it works with a minimalistic example (not secured nor suitable for production). +You can run it on [minikube](https://minikube.sigs.k8s.io) if you a more interactive reading. + +Start by creating a [ConfigMap](https://kubernetes.io/docs/concepts/configuration/configmap/) containg Garage's configuration (let's name it `config.yaml`): + +```yaml +apiVersion: v1 +kind: ConfigMap +metadata: + name: garage-config + namespace: default +data: + garage.toml: |- + metadata_dir = "/mnt/fast" + data_dir = "/mnt/slow" + + replication_mode = "3" + + rpc_bind_addr = "[::]:3901" + rpc_secret = "<secret>" + + bootstrap_peers = [] + + kubernetes_namespace = "default" + kubernetes_service_name = "garage-daemon" + kubernetes_skip_crd = false + + [s3_api] + s3_region = "garage" + api_bind_addr = "[::]:3900" + root_domain = ".s3.garage.tld" + + [s3_web] + bind_addr = "[::]:3902" + root_domain = ".web.garage.tld" + index = "index.html" +``` + +The 3 important parameters are `kubernetes_namespace`, `kubernetes_service_name`, and `kubernetes_skip_crd`. +Configure them according to your planned deployment. +The last one controls wether you want to create the CRD manually or allow Garage to create it automatically on boot. +In this example, we keep it to `false`, which means we allow Garage to automatically create the CRD. + +Apply this configuration on your cluster: + +```bash +kubectl apply -f config.yaml +``` + +Allowing Garage to create the CRD is not enough, the process must have enough permissions. +A quick unsecure way to add the permission is to create a [ClusterRoleBinding](https://kubernetes.io/docs/reference/access-authn-authz/rbac/#rolebinding-and-clusterrolebinding) to give admin rights to our local user, effectively breaking Kubernetes' security model (we name this file `admin.yml`): + +```yaml +apiVersion: rbac.authorization.k8s.io/v1 +kind: ClusterRoleBinding +metadata: + name: garage-admin +roleRef: + apiGroup: rbac.authorization.k8s.io + kind: ClusterRole + name: cluster-admin +subjects: +- apiGroup: rbac.authorization.k8s.io + kind: User + name: system:serviceaccount:default:default +``` + +Apply it: + +```bash +kubectl apply -f admin.yaml +``` + +Finally, we create a [StatefulSet](https://kubernetes.io/fr/docs/concepts/workloads/controllers/statefulset/) to run our service (`service.yaml`): + +```yaml +apiVersion: apps/v1 +kind: StatefulSet +metadata: + name: garage +spec: + selector: + matchLabels: + app: garage + serviceName: "garage" + replicas: 3 + template: + metadata: + labels: + app: garage + spec: + terminationGracePeriodSeconds: 10 + containers: + - name: garage + image: dxflrs/amd64_garage:v0.7.0 + ports: + - containerPort: 3900 + name: s3-api + - containerPort: 3902 + name: web-api + volumeMounts: + - name: fast + mountPath: /mnt/fast + - name: slow + mountPath: /mnt/slow + - name: etc + mountPath: /etc/garage.toml + subPath: garage.toml + volumes: + - name: etc + configMap: + name: garage-config + volumeClaimTemplates: + - metadata: + name: fast + spec: + accessModes: [ "ReadWriteOnce" ] + resources: + requests: + storage: 100Mi + - metadata: + name: slow + spec: + accessModes: [ "ReadWriteOnce" ] + resources: + requests: + storage: 100Mi +``` + +Garage is a stateful program, so it needs a stable place to store its data and metadata. +This feature is provided by Kubernetes' [Persistent Volumes](https://kubernetes.io/docs/concepts/storage/persistent-volumes/) that can be used only from a [StatefulSet](https://kubernetes.io/fr/docs/concepts/workloads/controllers/statefulset/), hence the choice of this K8S object to deploy our service. + +Kubernetes has many "drivers" for Persistent Volumes, for production uses we recommend **only** the `local` driver. +Using other drivers may lead to huge performance issues or data corruption, probably both in practice. + +In the example, we are claiming 2 volumes of 100MB. +We use 2 volumes instead of 1 because Garage separates its metadata from its data. +By having 2 volumes, you can reserve a smaller capacity on a SSD for the metadata and a larger capacity on a regular HDD for the data. +Do not forget to change the reserved capacity, 100MB is only suitable for testing. + +*Note how we are mounting our ConfigMap: we need to set the `subpath` property to mount only the `garage.toml` file and not the whole `/etc` folder that would prevent K8S from writing its own files +in `/etc` and fail the pod.* + +You can apply this file with: + +```bash +kubectl apply -f service.yaml +``` + +Now, you are ready to interact with your cluster, each instance must have discovered the other ones: + +```bash +kubectl exec -it garage-0 --container garage -- /garage status +# ==== HEALTHY NODES ==== +# ID Hostname Address Tags Zone Capacity +# e6284331c321a23c garage-0 172.17.0.5:3901 NO ROLE ASSIGNED +# 570ff9b0ed3648a7 garage-2 [::ffff:172.17.0.7]:3901 NO ROLE ASSIGNED +# e1990a2069429428 garage-1 [::ffff:172.17.0.6]:3901 NO ROLE ASSIGNED +``` + +Of course, to have a full deployment, you will probably want to deploy a [Service](https://kubernetes.io/docs/concepts/services-networking/service/) in front of your cluster and/or a reverse proxy. + +If Kubernetes is not your thing, know that we are running Garage on a Nomad+Consul cluster. +We have not documented it yet but you can get a look at [our Nomad service](https://git.deuxfleurs.fr/Deuxfleurs/infrastructure/src/commit/1e5e4af35c073d04698bb10dd4ad1330d6c62a0d/app/garage/deploy/garage.hcl). + ## OpenTelemetry support -T +## And next? + +roadmap: k2v, allocation simulator, s3 compatibility, community feedback, whitepaper + |