sealer

# Quick start

This guide covers how you can quickly get started using Sealer.

# PREREQUISITES

  1. Install the sealer locally.
  2. Prepare six hosts and record their IPs and passwords, the following conditions are recommended:
    1. Hardware: 4C8G + 50G(System Disk)
    2. OS: CentOS/RHEL 7.5、CentOS/RHEL 7.6、CentOS/RHEL 7.7、CentOS/RHEL 7.8、CentOS/RHEL 7.9
    3. Kernel: 4.18.（Recommend）、4.19. 、 3.10.*（>=3.10.0-1160）

# Install a kubernetes cluster

# run a kubernetes cluster
sealer run docker.io/sealerio/kubernetes:v1.22.15 \
  --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

[root@iZm5e42unzb79kod55hehvZ ~]# kubectl get node
NAME                    STATUS ROLES AGE VERSION
izm5e42unzb79kod55hehvz Ready master 18h v1.22.15
izm5ehdjw3kru84f0kq7r7z Ready master 18h v1.22.15
izm5ehdjw3kru84f0kq7r8z Ready master 18h v1.22.15
izm5ehdjw3kru84f0kq7r9z Ready <none> 18h v1.22.15
izm5ehdjw3kru84f0kq7raz Ready <none> 18h v1.22.15
izm5ehdjw3kru84f0kq7rbz Ready <none> 18h v1.22.15

# Build an app image

nginx.yaml:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-nginx
  namespace: default
spec:
  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 scratch
APP nginx local://nginx.yaml
LAUNCH ["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 pod
kubectl get pod -A

# Push the app image to the registry

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

# Clean the cluster

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

sealer delete -a

# SEE ALSO

← Installing Sealer →