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第6节 k3s Runtime Design

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❤️💕💕记录sealos开源项目的学习过程。k8s,docker和云原生的学习。Myblog:http://nsddd.top

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[TOC]

Idea

The community has great expectations for k3s. we need a more lightweight runtime (#issue)

• With high availability, reduce installation cost
• high availability etcd
• runtime interface need spilt kubeadm and k3s and k0s，Interface layer exposure, alignment
• new_runtime.go determines which runtime.go to call based on the parameters passed in
• k3s rootfs
• Add a corresponding test function
• Minimum resource test k3s vs k0s

module list

#runtime
|____interface.go
|____types.go
|____utils.go
|____utils_test.go
|____new_runtime.go # new_runtime determines which runtime.go to call based on the parameters passed in
|____k0s
| |____common.go
| |____delete_masters.go
| |____delete_nodes.go
| |____init.go
| |____join_masters.go
| |____join_nodes.go
| |____README.md
| |____registry.go
| |____reset.go
| |____runtime.go
| |____upgrade.go
| |____utils.go
| |____v1beta1
| | |____types.go
|____kubernetes
| |____clean.go
| |____driver.go
| |____init.go
| |____join_masters.go
| |____join_nodes.go
| |____kubeadm
| | |____common.go
| | |____kubeadm_config.go
| | |____kubeadm_config_test.go
| |____runtime.go
| |____utils.go

interface(☕in preparation…)

type Interface interface {
	// Init exec kubeadm init
	Init(cluster *v2.Cluster) error
	Upgrade() error
	Reset() error
	JoinMasters(newMastersIPList []string) error
	JoinNodes(newNodesIPList []string) error
	DeleteMasters(mastersIPList []string) error
	DeleteNodes(nodesIPList []string) error
	//UpdateCert(certs []string) error
    NewK0sRuntime(cluster *v2.Cluster)(runtime.Installer, error) 
}

demo: 🧷 Runtime interface demonstration

achieve interface

1. Support k3s to init、join、upgrade、reset k3s cluster
2. Support docker as runtime
3. Pakage the CloudImage

CloudRootfs

kubernetes:

/var/lib/sealer/data/overlay2/ebd0f721b47d5f7f3ea287fe0882613960deef376e5556b34baab95330aa6bad

Kuberfile - k8s:

FROM scratch
COPY . .
COPY imageList manifests

Kuberfile - k0s:

COPY rootfs/* .
COPY ${ARCH} .
COPY ImageList manifests
BASE rootfs cache

Kuberfile - k3s:

My talking about packaging up a minimal Linux distribution to run K3s, similar to https://github.com/rancher/k3os? Or mean just the root filesystem, such as we provide with k3s via https://github.com/k3s-io/k3s-root ?

⚠️

1. Online Installation

FROM scratch
COPY imageList manifests
RUN curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=v1.25.3 sh -
COPY . .

2. Offline installation

k3s-insatll.sh 、k3s-airgap-images-$ARCH.tar、k3sbinary system

FROM scratch
COPY imageList manifests
COPY . .

k3s - rootfs

sh install.sh There are a number of link types from bin

.# k3s rootfs
├── bin
│  ├── k3s
├── etc
│  ├── k3s
│  │   └── k3s.yaml
│  └── node
│      └── password
├── images
├── k3s-install.sh
├── Kuberfile
├── Metadata
└── README.md

About the k3s difference

• Comparison of k3s vs k0s
• Comparison of containerd vs docker

**The installation script is k3s-insatll.sh. **

cluster role:

• k3s server
• k3s agents(worker nodes)

uninstalling a node:

k3s : k3s-uninstall.sh

• k3s server : /usr/local/bin/k3s-uninstall.sh
• k3s agent : /usr/local/bin/k3s-agent-uninstall.sh

version

Embedded Component Versions

Component	Version
Kubernetes	v1.25.3
Kine	v0.9.3
SQLite	3.36.0
Etcd	v3.5.3-k3s1
Containerd	v1.6.8-k3s1
Runc	v1.1.4
Flannel	v0.19.2
Metrics-server	v0.6.1
Traefik	v2.9.1
CoreDNS	v1.9.1
Helm-controller	v0.12.3
Local-path-provisioner	v0.0.21

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