乌班图搭建K8S集群（两主两从）
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为了增加稳定性，在原有 k8s集群的基础上，增加一个 master 节点，然后在 master1 和 master2 之间做 keepalive，通过 vip 去访问业务；
安装步骤
1.尝试离线环境部署，所以先在本地有网的环境创建一个低配置的乌班图 22.04 版本的虚机，然后安装好基础环境（通过 apt-get安装好 docker、各种依赖镜像和k8s，keepalive），不要初始化kubeadm！(可以参考下文前面的部分)
【Ubuntu22.04配置k8s集群】_ubunut 22.04 chronyd-CSDN博客
2.然后关机导出 vmdk 镜像上传至生产环境；接下来在生产环境导入这个镜像，创建 4 个虚机；
3.重新修改网卡配置后，修改 host 文件和主机名
172.28.0.34 master1
172.28.0.35 master2
172.28.0.36 node1
172.28.0.37 node2
hostnamectl set-hostname xxxx
修改 keepalive.yaml文件配置，改为 vip 地址（172.28.0.39）
vim /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
state MASTER
interface ens160
virtual_router_id 51
priority 100 # 优先级 (主服务器优先级高)
advert_int 1 # 心跳间隔 (秒)
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.28.0.39 # 虚拟IP
}
}
修改 docker 仓库地址为 harbor 仓库地址地址，然后进行 docker login 认证
vim /etc/docker/daemon.json
{"registry-mirrors": ["harbor仓库地址"]}
- 仓库地址如果是 http 的，需要daemon.json，把registry-mirrors改成insecure-registries修改允许 http请求；
2.docker 登录完以后需要将/root/.docker/config.json 复制到/var/lib/kebelet/config.json，让 k8s集群中也有 docker 的登录授权信息；
4.创建kubeadm.yaml（注意修改地址）
apiVersion: kubeadm.k8s.io/v1beta3
bootstrapTokens:
- groups:
- system:bootstrappers:kubeadm:default-node-token
token: abcdef.0123456789abcdef
ttl: 24h0m0s
usages:
- signing
- authentication
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: 172.28.0.38
bindPort: 6443
nodeRegistration:
criSocket: /var/run/dockershim.sock
imagePullPolicy: IfNotPresent
name: node
taints: null
---
apiServer:
timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta3
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns: {}
etcd: #etcd集群
local:
dataDir: /var/lib/etcd
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: 1.23.0
controlPlaneEndpoint: 172.28.0.38:6443
apiServer:
certSANs: #填写vip地址、maste1和maste2地址
- 172.28.0.38
- 172.28.0.34
- 172.28.0.35
networking:
dnsDomain: cluster.local
serviceSubnet: 10.96.0.0/12
podSubnet: 10.2.0.0/16
scheduler: {}
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs
5.在 master1 上执行初始化命令
kubeadm init --config kubeadm.yaml
重新获取join命令 kubeadm token create --print-join-command
6.需要将 master1 上面的证书复制到 master2
# 先在 master 上创建相关文件夹
mkdir -p /etc/kubernetes/pki/etcd/
在master1上执行，将master1的证书拷贝到master2
scp /etc/kubernetes/pki/ca.* master2:/etc/kubernetes/pki/
scp /etc/kubernetes/pki/sa.* master2:/etc/kubernetes/pki/
scp /etc/kubernetes/pki/front-proxy-ca.* master2:/etc/kubernetes/pki/
scp /etc/kubernetes/pki/etcd/ca.* master2:/etc/kubernetes/pki/etcd/
7.将上面的join命令分别在 master2 、node1和 node2 上面执行
8.将master1的 admin.conf复制到其他三台设备
scp /etc/kubernetes/admin.conf master2:/etc/kubernetes/
scp /etc/kubernetes/admin.conf node1:/etc/kubernetes/
scp /etc/kubernetes/admin.conf node2:/etc/kubernetes/
#然后四台设备上执行
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
9.安装网络插件flannel
vim flannel.yaml
---
kind: Namespace
apiVersion: v1
metadata:
name: kube-flannel
labels:
k8s-app: flannel
pod-security.kubernetes.io/enforce: privileged
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
labels:
k8s-app: flannel
name: flannel
rules:
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- get
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
labels:
k8s-app: flannel
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
k8s-app: flannel
name: flannel
namespace: kube-flannel
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-flannel
labels:
tier: node
k8s-app: flannel
app: flannel
data:
cni-conf.json: |
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
net-conf.json: |
{
"Network": "10.2.0.0/16",
"EnableNFTables": false,
"Backend": {
"Type": "vxlan"
}
}
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds
namespace: kube-flannel
labels:
tier: node
app: flannel
k8s-app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni-plugin
image: docker.io/flannel/flannel-cni-plugin:v1.5.1-flannel1
command:
- cp
args:
- -f
- /flannel
- /opt/cni/bin/flannel
volumeMounts:
- name: cni-plugin
mountPath: /opt/cni/bin
- name: install-cni
image: docker.io/flannel/flannel:v0.25.4
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
image: docker.io/flannel/flannel:v0.25.4
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: EVENT_QUEUE_DEPTH
value: "5000"
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
- name: xtables-lock
mountPath: /run/xtables.lock
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni-plugin
hostPath:
path: /opt/cni/bin
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
- name: xtables-lock
hostPath:
path: /run/xtables.lock
type: FileOrCreate
kubectl apply -f flannel.yaml
10.检查节点状态
11.查看 etcd 集群状态
kubectl get cs
