k8s calico 离线安装

作为一名经验丰富的开发者,你将会接触到很多关于Kubernetes(K8S)的任务,其中之一就是离线安装calico网络插件。本篇文章将带你了解整个流程,并提供代码示例来帮助你完成这个任务。

整体流程:
1. 下载calico二进制文件
2. 构建calico镜像
3. 将镜像推送到本地仓库
4. 部署calico到K8S集群

下面是每个步骤需要做的事情和相关的代码示例:

第一步:下载calico二进制文件
在进行离线安装之前,我们需要先下载calico的二进制文件。你可以从calico的官方GitHub仓库中获取到最新的二进制文件。

第二步:构建calico镜像
在这一步中,我们将使用Dockerfile构建calico镜像。Dockerfile是一个用于自动化构建Docker镜像的文本文件。

以下是一个简单的Dockerfile示例:

```Dockerfile
FROM quay.io/calico/cni:v3.17.2 as cni
FROM quay.io/calico/node:v3.17.2 as node
FROM quay.io/calico/kube-controllers:v3.17.2 as kube-controllers
```

以上示例中,我们使用了calico的官方Docker镜像作为基础镜像,并从该镜像中提取了cni、node和kube-controllers组件。

第三步:将镜像推送到本地仓库
在离线环境中,我们需要将构建好的calico镜像推送到本地仓库,以便在部署过程中使用。

你可以使用以下命令将镜像推送到本地仓库:

```shell
# 将镜像保存为tar文件
docker save calico_image:tag > calico_image.tar

# 将tar文件导入到本地仓库
docker load -i calico_image.tar
```

第四步:部署calico到K8S集群
现在我们已经准备好镜像并将其推送到本地仓库,下面是如何将calico部署到K8S集群的示例代码:

```yaml
# 保存为 calico.yaml

apiVersion: v1
kind: Namespace
metadata:
name: calico

---
apiVersion: v1
kind: Secret
metadata:
name: calico-etcd-secrets
namespace: calico
data:
etcd-ca:
etcd-cert:
etcd-key:

---
apiVersion: v1
kind: ConfigMap
metadata:
name: calico-config
namespace: calico
data:
typha_service_name: calico-typha
typha_service: |-
{
"annotations": { "projectcalico.org/service-type": "ClusterIP" },
"spec": { "type": "LoadBalancer" }
}

---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: calico-node
namespace: calico
spec:
selector:
matchLabels:
k8s-app: calico-node
template:
metadata:
labels:
k8s-app: calico-node
spec:
hostNetwork: true
serviceAccountName: calico-node
tolerations:
- operator: Exists
effect: NoSchedule
initContainers:
- name: upgrade-ipam
image: calico/cni:v3.17.2
env:
- name: ETCD_ENDPOINTS
value: "https://"
- name: ETCD_CA_CERT_FILE
value: "/var/lib/calico/etcd-ca.pem"
- name: ETCD_CERT_FILE
value: "/var/lib/calico/etcd-cert.pem"
- name: ETCD_KEY_FILE
value: "/var/lib/calico/etcd-key.pem"
command: ["/opt/cni/bin/calico-ipam", "-upgrade"]
volumeMounts:
- name: etcd-ca
mountPath: /var/lib/calico/etcd-ca.pem
subPath: etcd-ca.pem
readOnly: true
- name: etcd-cert
mountPath: /var/lib/calico/etcd-cert.pem
subPath: etcd-cert.pem
readOnly: true
- name: etcd-key
mountPath: /var/lib/calico/etcd-key.pem
subPath: etcd-key.pem
readOnly: true
containers:
- image: calico/node:v3.17.2
name: calico-node
envFrom:
- configMapRef:
name: calico-config
env:
- name: FELIX_IPTABLESBACKEND
value: "NFT"
resources:
requests:
cpu: 250m
securityContext:
privileged: true
volumeMounts:
- name: etcd-ca
mountPath: /var/lib/calico/etcd-ca.pem
subPath: etcd-ca.pem
readOnly: true
- name: etcd-cert
mountPath: /var/lib/calico/etcd-cert.pem
subPath: etcd-cert.pem
readOnly: true
- name: etcd-key
mountPath: /var/lib/calico/etcd-key.pem
subPath: etcd-key.pem
readOnly: true
- name: var-run-calico
mountPath: /var/run/calico
- name: lib-modules
mountPath: /lib/modules
readOnly: true
volumes:
- name: etcd-ca
secret:
secretName: calico-etcd-secrets
items:
- key: etcd-ca
path: etcd-ca.pem
- name: etcd-cert
secret:
secretName: calico-etcd-secrets
items:
- key: etcd-cert
path: etcd-cert.pem
- name: etcd-key
secret:
secretName: calico-etcd-secrets
items:
- key: etcd-key
path: etcd-key.pem
- name: var-run-calico
hostPath:
path: /var/run/calico
- name: lib-modules
hostPath:
path: /lib/modules

---
apiVersion: v1
kind: Service
metadata:
name: calico-typha
namespace: calico
annotations:
projectcalico.org/service-type: ClusterIP
spec:
selector:
k8s-app: calico-typha
ports:
- name: http
port: 5473
```

在上述示例中,你需要修改相关字段的值,以适应你的环境。其中,是需要进行base64编码后的etcd证书文件内容。另外,应替换为你的etcd端点。

以上就是离线安装calico的步骤和代码示例。按照这些步骤,你应该能够成功完成calico的离线安装。希望本文对你理解和实现"k8s calico 离线安装"有所帮助。