Sealer: A Cloud-Native Cluster Packaging and Delivery Tool by Alibaba
Sealer is an open-source Alibaba tool for packaging, delivering, and running distributed applications as cluster images, simplifying Kubernetes cluster deployment and management on Linux systems.
Sealer is an open-source solution from Alibaba designed to package and deliver distributed applications—including dependencies like databases and middleware—as a single cluster image. This approach streamlines deployment, akin to receiving a fully furnished house instead of building from scratch.
To use Sealer, users must prepare a Linux machine (virtual or physical), as it does not support macOS or Windows. Installation begins with downloading the binary:
wget https://github.com/alibaba/sealer/releases/download/v0.4.0/sealer-v0.4.0-linux-amd64.tar.gzAfter extraction using: tar zxvf sealer-v0.4.0-linux-amd64.tar.gz the sealer executable is moved to a system path (e.g., /usr/local/bin) for global access: mv ./sealer /usr/local/bin Once installed, users can deploy a Kubernetes cluster in seconds using a pre-built cluster image:
sealer run kubernetes:v1.19.9 --masters xxx.xxx.xxx.xxx --passwd xxxTo uninstall the cluster, a single command suffices: sealer delete --all The tool significantly reduces operational complexity for cluster lifecycle management, making it ideal for rapid prototyping and deployment in cloud-native environments.
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