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Build, Share and Run Both Your Kubernetes Cluster and Distributed Applications (Project under CNCF)

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Apache-2.0 license

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Sealer -- Build, Share and Run Any Distributed Applications

Introduction

Sealer[ˈsiːlər] provides a new way of distributed application delivery which is reducing the difficulty and complexity by packaging Kubernetes cluster and all application's dependencies into one ClusterImage.

We can write a Kubefile to build the ClusterImage, and use it to deliver your applications with embedded Kubernetes through Clusterfile.

Concept

Kubefile: a file that describes how to build a ClusterImage.
ClusterImage: like docker image, and it contains all the dependencies(container images,yaml files or helm chart...) of your application needed.
Clusterfile: a file that describes how to run a ClusterImage.

Awesome features

Simplicity: Packing the distributed application into ClusterImage with few instructions.
Efficiency: Launching the k8s-based application through ClusterImage in minutes.
Scalability: Powerful cluster and image life cycle management, such as cluster scale, upgrade, image load, save and so on.
Compatibility: Multi-arch delivery Supporting. Such as AMD, ARM with common Linux distributions.
Iterative: Incremental operations on ClusterImage is like what container image behaves.

Quick start

Download sealer binary file.

#install Sealer binarieswget https://github.com/sealerio/sealer/releases/download/v0.9.3/sealer-v0.9.3-linux-amd64.tar.gz&& \tar zxvf sealer-v0.9.3-linux-amd64.tar.gz&& mv sealer /usr/bin

Install a kubernetes cluster

# run a kubernetes clustersealer run docker.io/sealerio/kubernetes:v1-22-15-sealerio-2 \  --masters 192.168.0.2,192.168.0.3,192.168.0.4 \  --nodes 192.168.0.5,192.168.0.6,192.168.0.7 --passwd xxx

Build an sealer image

Kubefile:

FROM docker.io/sealerio/kubernetes:v1-22-15-sealerio-2APP mysql https://charts/mysql.tgzAPP elasticsearch https://charts/elasticsearch.tgzAPP redis local://redis.yamlAPP businessApp local://install.shLAUNCH ["calico","mysql","elasticsearch","redis","businessApp"]

FROM docker.io/sealerio/kubernetes:v1-22-15-sealerio-2COPY mysql.tgz.COPY elasticsearch.tgz.COPY redis.yaml.COPY install.sh.CMDS ["sh application/apps/calico/calico.sh","helm install mysql.tgz","helm install elasticsearch.tgz","kubectl apply -f redis.yaml","bash install.sh"]

build command:

NOTE: --type=kube-installer is the default value for sealer build

sealer build -f Kubefile -t my-kubernetes:1.0.0.

Build an app image

nginx.yaml:

apiVersion: apps/v1kind: Deploymentmetadata:  name: my-nginx  namespace: defaultspec:  replicas: 1  selector:    matchLabels:      run: my-nginx  template:    metadata:      labels:        run: my-nginx    spec:      containers:        - name: my-nginx          image: nginx          ports:            - containerPort: 80

Kubefile:

FROM scratchAPP nginx local://nginx.yamlLAUNCH ["nginx"]

sealer build -f Kubefile -t sealer-io/nginx:latest --type app-installer

Run the app image

sealer run sealer-io/nginx:latest# check the podkubectl get pod -A

Push the app image to the registry

# you can push the app image to docker hub, Ali ACR, or Harborsealer tag sealer-io/nginx:latest {registryDomain}/sealer-io/nginx:latestsealer push {registryDomain}/sealer-io/nginx:latest

Clean the cluster

Some information of the basic settings will be written to the Clusterfile and stored in /root/.sealer/Clusterfile.

sealer delete -a

User guide

Sealer provides a valid image list:

version	image	Arch	OS	Network plugins	container runtime
v0.8.6	registry.cn-qingdao.aliyuncs.com/sealer-io/kubernetes:v1.22.15-0.8.6	x86	CentOS/RHEL 7.5 CentOS/RHEL 7.6 CentOS/RHEL 7.7 CentOS/RHEL 7.8 CentOS/RHEL 7.9 Ubuntu 20.04	calico	hack docker v19.03.14
v0.9.3	docker.io/sealerio/kubernetes:v1-18-3-sealerio-2	x86/arm64	CentOS/RHEL 7.5 CentOS/RHEL 7.6 CentOS/RHEL 7.7 CentOS/RHEL 7.8 CentOS/RHEL 7.9 Ubuntu 20.04	calico	hack docker v19.03.14
v0.9.3	docker.io/sealerio/kubernetes:v1-20-4-sealerio-2	x86/arm64	CentOS/RHEL 7.5 CentOS/RHEL 7.6 CentOS/RHEL 7.7 CentOS/RHEL 7.8 CentOS/RHEL 7.9 Ubuntu 20.04	calico	hack docker v19.03.14
v0.9.3	docker.io/sealerio/kubernetes:v1-22-15-sealerio-2	x86/arm64	CentOS/RHEL 7.5 CentOS/RHEL 7.6 CentOS/RHEL 7.7 CentOS/RHEL 7.8 CentOS/RHEL 7.9 Ubuntu 20.04	calico	hack docker v19.03.14