Build distributed application, share to anyone and run anywhere!!!
sealer[ˈsiːlər] provides the way for distributed application package and delivery based on kubernetes.
It solves the delivery problem of complex applications by packaging distributed applications and dependencies(like database,middleware) together.
Concept
- CloudImage : like Dockerimage, but the rootfs is kubernetes, and contains all the dependencies(docker images,yaml files or helm chart...) your application needs.
- Kubefile : the file describe how to build a CloudImage.
- Clusterfile : the config of using CloudImage to run a cluster.
We can write a Kubefile, and build a CloudImage, then using a Clusterfile to run a cluster.
For example, build a dashboard CloudImage:
Kubefile:
# base CloudImage contains all the files that run a kubernetes cluster needed.
# 1. kubernetes components like kubectl kubeadm kubelet and apiserver images ...
# 2. docker engine, and a private registry
# 3. config files, yaml, static files, scripts ...
FROM registry.cn-qingdao.aliyuncs.com/sealer-io/cloudrootfs:v1.16.9-alpha.6
# download kubernetes dashboard yaml file
RUN wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.2.0/aio/deploy/recommended.yaml
# when run this CloudImage, will apply a dashboard manifests
CMD kubectl apply -f recommended.yamlBuild dashobard CloudImage:
sealer build -t registry.cn-qingdao.aliyuncs.com/sealer-io/dashboard:latest .Run a kubernetes cluster with dashboard:
# sealer will install a kubernetes on host 192.168.0.2 then apply the dashboard manifests
sealer run registry.cn-qingdao.aliyuncs.com/sealer-io/dashboard:latest --master 192.168.0.2 --passwd xxx
# check the pod
kubectl get pod -A|grep dashboardPush the CloudImage to the registry
# you can push the CloudImage to docker hub, Ali ACR, or Harbor
sealer push registry.cn-qingdao.aliyuncs.com/sealer-io/dashboard:latest- An extremely simple way to install kubernetes and other software in the kubernetes ecosystem in a production or offline environment.
- Through Kubefile, you can easily customize the kubernetes CloudImage to package the cluster and applications, and submit them to the registry.
- Powerful life cycle management capabilities, to perform operations such as cluster upgrade, cluster backup and recovery, node expansion and contraction in unimaginable simple ways
- Very fast, complete cluster installation within 3 minutes
- Support ARM x86, v1.20 and above versions support containerd, almost compatible with all Linux operating systems that support systemd
- Does not rely on ansible haproxy keepalived, high availability is achieved through ipvs, takes up less resources, is stable and reliable
- There are very few in the official warehouse. Many ecological software images can be used directly, including all dependencies, one-click installation
Install a kubernetes cluster
sealer run kubernetes:v1.19.2 --master 192.168.0.2If it is installed on the cloud:
export ACCESSKEYID=xxx
export ACCESSKEYSECRET=xxx
sealer run registry.cn-qingdao.aliyuncs.com/sealer-io/dashboard:latestOr specify the number of nodes to run the cluster
sealer run registry.cn-qingdao.aliyuncs.com/sealer-io/dashboard:latest \
--masters 3 --nodes 3[root@iZm5e42unzb79kod55hehvZ ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
izm5e42unzb79kod55hehvz Ready master 18h v1.16.9
izm5ehdjw3kru84f0kq7r7z Ready master 18h v1.16.9
izm5ehdjw3kru84f0kq7r8z Ready master 18h v1.16.9
izm5ehdjw3kru84f0kq7r9z Ready <none> 18h v1.16.9
izm5ehdjw3kru84f0kq7raz Ready <none> 18h v1.16.9
izm5ehdjw3kru84f0kq7rbz Ready <none> 18h v1.16.9View the default startup configuration of the CloudImage:
sealer config registry.cn-qingdao.aliyuncs.com/sealer-io/dashboard:latestUse Clusterfile to set up a k8s cluster
Clusterfile content:
apiVersion: sealer.aliyun.com/v1alpha1
kind: Cluster
metadata:
name: my-cluster
spec:
image: registry.cn-qingdao.aliyuncs.com/sealer-io/cloudrootfs:v1.16.9-alpha.5
provider: BAREMETAL
ssh:
passwd:
pk: xxx
pkPasswd: xxx
user: root
network:
interface: eth0
cniName: calico
podCIDR: 100.64.0.0/10
svcCIDR: 10.96.0.0/22
withoutCNI: false
certSANS:
-aliyun-inc.com
-10.0.0.2
masters:
ipList:
-172.20.125.234
-172.20.126.5
-172.20.126.6
nodes:
ipList:
-172.20.126.8
-172.20.126.9
-172.20.126.10
[root@iZm5e42unzb79kod55hehvZ ~]# sealer apply -f Clusterfile
[root@iZm5e42unzb79kod55hehvZ ~]# kubectl get nodeScenario 2. Automatically apply for Alibaba Cloud server for installation, provider: ALI_CLOUD Clusterfile:
apiVersion: sealer.aliyun.com/v1alpha1
kind: Cluster
metadata:
name: my-cluster
spec:
image: registry.cn-qingdao.aliyuncs.com/sealer-io/cloudrootfs:v1.16.9-alpha.5
provider: ALI_CLOUD
ssh:
passwd:
pk: xxx
pkPasswd: xxx
user: root
network:
interface: eth0
cniName: calico
podCIDR: 100.64.0.0/10
svcCIDR: 10.96.0.0/22
withoutCNI: false
certSANS:
-aliyun-inc.com
-10.0.0.2
masters:
cpu: 4
memory: 4
count: 3
systemDisk: 100
dataDisks:
-100
nodes:
cpu: 4
memory: 4
count: 3
systemDisk: 100
dataDisks:
-100
Some information of the basic settings will be written to the Clusterfile and stored in /root/.sealer/[cluster-name]/Clusterfile.
sealer delete -f /root/.sealer/my-cluster/Clusterfile