GitLab Installation and Configuration

Download the rpm

GitLab Installation

Installation

rpm -i gitlab-ce-17.3.7-ce.0.el8.aarch64.rpm

Kubernetes Dashboard

wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.7.0/aio/deploy/recommended.yaml

kubectl apply -f recommend.yaml

kubectl get all -n kubernetes-dashboard -o wide

https://ip:port

# Create account configuration
touch dashboard-admin.yaml

CronJob

Similar as crontab in Linux

apiVersion: batch/v1
kind: CronJob
metadata:
  name: hello
spec:
  concurrencyPolicy: Allow # 并发调度策略：Allow 允许并发调度，Forbid：不允许并发执行，Replace：如果之前的任务还没执行完，就直接执行新的，放弃上一个任务
  failedJobsHistoryLimit: 1 # 保留多少个失败的任务
  successfulJobsHistoryLimit: 3 # 保留多少个成功的任务
  suspend: false # 是否挂起任务，若为 true 则该任务不会执行
#  startingDeadlineSeconds: 30 # 间隔多长时间检测失败的任务并重新执行，时间不能小于 10
  schedule: "* * * * *" # 调度策略
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: hello
            image: busybox:1.28
            imagePullPolicy: IfNotPresent
            command:
            - /bin/sh
            - -c
            - date; echo Hello from the Kubernetes cluster
          restartPolicy: OnFailure

Helm is a package manager for Kubernetes, designed to simplify the deployment and management of applications on Kubernetes clusters. Helm allows developers to package, configure, and deploy applications as reusable "charts," which are collections of YAML files that describe a related set of Kubernetes resources.

1. DIY Configuration
2. Kube-prometheus (Recommended)

cd kube-prometheus
kubectl create -f manifests/setup/
kubectl create -f manifests/
kubectl get all -n monitoring
kubectl get svc -n monitoring

1. Elasticsearch:ES is a search-oriented document database that boasts excellent search capabilities and provides a rich set of REST APIs for easy interface calls.
2. Kibana:A visualization tool based on ES, which allows for easy visual management and operation of Elasticsearch data.
3. Logstash:While Logstash can also be used for log collection, deploying Logstash on every node might be too heavy, so here Filebeat is primarily used for data collection, leaving Logstash to handle data transformation.

Volumes

HostPath allows you to mount a file or directory from the host node into a Pod. When using HostPath, the specified directory on the node serves as a persistent storage location. Even if the Pod is deleted or restarted, the data in that directory remains intact and can be reloaded, ensuring that files in the directory are not lost.

ConfigMap

kubectl create cm -h # Check the configuration information

Service is for East-West Traffic, Ingress is for North-South Traffic

Service is used for communication among different microservices

Endpoints manage and maintain pointed IP

Service Configuration

apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
  labels:
    app: nginx-svc
spec:
  ports:
    - name: http # Name of the service port configuration
      protocol: TCP # Protocol used for port binding, supports TCP, UDP, SCTP; defaults to TCP
      port: 80 # The service's port
      targetPort: 9527 # The target pod's port
    - name: https
      port: 443
      protocol: TCP
      targetPort: 443
  selector: # Select which pods the current service will match and proxy traffic to
    app: nginx

Label and Selector

Check label

kubectl get po --show-labels
NAME         READY   STATUS    RESTARTS   AGE   LABELS
nginx-demo   1/1     Running   0          23h   type=app,version=1.0.0