MicroK8S简要安装MongoDB
## 前期准备 ##
当前用户目录下创建新的隐藏目录，该隐藏目录中用于存放配置文件和软件数据
cd ~
mkdir .k8sconfig && cd .k8sconfig
mkdir mongo
检查microk8s是否正在运行
microk8s status
# 回显如下
microk8s is running
high-availability: no
datastore master nodes: 127.0.0.1:19001
datastore standby nodes: none
addons:
enabled:
dashboard # (core) The Kubernetes dashboard
dns # (core) CoreDNS
ha-cluster # (core) Configure high availability on the current node
helm # (core) Helm - the package manager for Kubernetes
helm3 # (core) Helm 3 - the package manager for Kubernetes
metrics-server # (core) K8s Metrics Server for API access to service metrics
rbac # (core) Role-Based Access Control for authorisation
disabled:
cert-manager # (core) Cloud native certificate management
community # (core) The community addons repository
gpu # (core) Automatic enablement of Nvidia CUDA
host-access # (core) Allow Pods connecting to Host services smoothly
hostpath-storage # (core) Storage class; allocates storage from host directory
ingress # (core) Ingress controller for external access
kube-ovn # (core) An advanced network fabric for Kubernetes
mayastor # (core) OpenEBS MayaStor
metallb # (core) Loadbalancer for your Kubernetes cluster
minio # (core) MinIO object storage
observability # (core) A lightweight observability stack for logs, traces and metrics
prometheus # (core) Prometheus operator for monitoring and logging
registry # (core) Private image registry exposed on localhost:32000
storage # (core) Alias to hostpath-storage add-on, deprecated
配置文件
准备配置文件，一共需要编写三份配置文件，分别为mongo-pv-pvc.yaml、mongo-configmap.yaml和mongo-deployment.yaml
vim mongo-pv-pvc.yaml
# 内容如下
apiVersion: v1
kind: PersistentVolume
metadata:
name: mongo-pv
labels:
app: mongo-app
spec:
storageClassName: standard
capacity:
storage: 10Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/root/.k8sconfig/mongo"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mongo-pvc
spec:
storageClassName: standard
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 10Gi
selector:
matchLabels:
app: mongo-app
vim mongo-configmap.yaml
# 配置如下
apiVersion: v1
kind: ConfigMap
metadata:
name: mongodb-config
data:
mongod.conf: |
# mongodb configuration file
storage:
dbPath: /data/db
net:
bindIp: 0.0.0.0
port: 27017
security:
authorization: enabled
vim mongo-deployment.yaml
# 配置如下
apiVersion: apps/v1
kind: Deployment
metadata:
name: mongodb
spec:
selector:
matchLabels:
app: mongodb
replicas: 1
template:
metadata:
labels:
app: mongodb
spec:
containers:
- name: mongodb
image: mongo:4.4.20
ports:
- containerPort: 27017
volumeMounts:
- name: mongo-persistent-storage
mountPath: /data/db
- name: mongo-config
mountPath: /etc/mongo
volumes:
- name: mongo-persistent-storage
persistentVolumeClaim:
claimName: mongo-pvc
- name: mongo-config
configMap:
name: mongodb-config
---
apiVersion: v1
kind: Service
metadata:
name: mongo-service
spec:
selector:
app: mongodb
ports:
- name: mongo
protocol: TCP
port: 27017
targetPort: 27017
type: NodePort
执行配置文件
执行配置文件
microk8s kubectl apply -f mongo-pv-pvc.yaml
microk8s kubectl apply -f mongo-configmap.yaml
microk8s kubectl apply -f mongo-deployment.yaml
检查是否正确安装
microk8s kubectl get service
microk8s kubectl get configmap
microk8s kubectl get pv
microk8s kubectl get pvc
microk8s kubectl get pod
microk8s kubectl get deployment
全部状态均为启动后即启动完成
特别说明: 测试机CPU较老且配置较低，不支持MongoDB5.0+版本，故使用4.4.20版本，5.0+版本无法启动的可以尝试降级安装
microk8s kubectl logs <pod名称>
WARNING: MongoDB 5.0+ requires a CPU with AVX support, and your current system does not appear to have that!
# 如果回显该警告信息，意为当前CPU不支持AVX，只能尝试安装低于5.0版本的mongodb
端口映射
端口映射可以先采用brook端口转发来实现
vim /root/.brook/brookforward.sh
# 内容如下
#!/bin/bash
brook relay -f :27018 -t 10.152.183.105:27017 &
把这个命令加入systemd
vim /etc/systemd/system/brook.service
[Unit]
Description=brookforward
After=syslog.target
After=network.target
[Service]
Type=forking
ExecStart=/root/.brook/brookforward.sh
[Install]
WantedBy=multi-user.target
启动后效果
mongo 127.0.0.1:27018
可以连接成功即为搭建成功