Gitlab CI/CD 部署应用到 K8S 演示
前言关于 Gitlab CE 部署 与 Gitlab CI 搭建请参考下文Docker Compose部署GitlabGitlab CI 搭建持续集成环境环境 与 概述一个 hello-...
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前言
关于 Gitlab CE 部署 与 Gitlab CI 搭建请参考下文
环境 与 概述
一个 hello-world nodejs 项目
Dockerfile 和 app.dev.yaml(k8s deploy 文件) 存放在业务代码中
Gitlab CI Build 机器需要安装
envsubst
命令构建一个 Docker 业务镜像发布到 Kubernetes 中
本项目部署 K8S Service 、HPA 和 Deployment
$CI_COMMIT_REF_SLUG
$CI_COMMIT_SHA
变量都是 Gitlab CI 内置的变量把 hello-world 项目部署到 Kubernetes default 命名空间中,
NODE_ENV
使用development
演示
编写 .gitlab-ci.yml 文件
$ vim .gitlab-ci.yml
stages: # 阶段
- deploy
deploy_dev:
stage: deploy
only: # 目前 CI 只对 develop、以 feature/.* 开头 和 以 feature-.* 开头分支有效
- develop
- /^feature\/.*$/
- /^feature-.*$/
tags: # CI tag 名称
- dev
script: # 构建命令
- envsubst < Dockerfile | docker build -t $IMAGE -f - .
- docker push $IMAGE
- envsubst < app.dev.yaml | kubectl apply -f -
variables: # 声明环境变量
IMAGE: harbor.example.com/default/hello-world-$CI_COMMIT_REF_SLUG:$CI_COMMIT_SHA
SERVICE_NAME: hello-world-$CI_COMMIT_REF_SLUG
NAMESPACE: default
NODE_ENV: development
编写 app.dev.yaml 文件
$ vim app.dev.yaml
apiVersion: v1
kind: Service
metadata:
name: $SERVICE_NAME
namespace: $NAMESPACE
labels:
app: $SERVICE_NAME
spec:
ports:
- port: 80
targetPort: 8080
protocol: TCP
selector:
app: $SERVICE_NAME
---
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
name: $SERVICE_NAME
namespace: $NAMESPACE
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: $SERVICE_NAME
minReplicas: 2
maxReplicas: 4
metrics:
- type: Resource
resource:
name: cpu
targetAverageUtilization: 80
- type: Resource
resource:
name: memory
targetAverageUtilization: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: $SERVICE_NAME
namespace: $NAMESPACE
labels:
app: $SERVICE_NAME
spec:
replicas: 1
revisionHistoryLimit: 3
strategy:
rollingUpdate:
maxSurge: 30%
maxUnavailable: 30%
selector:
matchLabels:
app: $SERVICE_NAME
template:
metadata:
labels:
app: $SERVICE_NAME
spec:
containers:
- name: $SERVICE_NAME
image: $IMAGE
imagePullPolicy: IfNotPresent
resources:
limits:
cpu: 400m
memory: 600Mi
requests:
cpu: 400m
memory: 600Mi
env:
- name: NODE_ENV
value: $NODE_ENV
- name: PORT
value: "8080"
livenessProbe:
httpGet:
path: /HealthCheck
port: 8080
scheme: HTTP
initialDelaySeconds: 30
timeoutSeconds: 5
periodSeconds: 30
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /HealthCheck
port: 8080
scheme: HTTP
initialDelaySeconds: 30
timeoutSeconds: 5
periodSeconds: 10
successThreshold: 1
failureThreshold: 5
ports:
- containerPort: 8080
imagePullSecrets:
- name: harbor-certification
编写 Dockerfile 文件
$ vim Dockerfile
FROM harbor.example.com/public/alpine-node:8.11.4
ADD --chown=node:node . /app
USER node
RUN cd /app \
&& yarn install
WORKDIR /app
EXPOSE 8080
CMD ["pm2-docker", "index.js", "--auto-exit", "--watch"]
CI/CD 构建展示
CI 构建
查看部署到 Kubernetes 项目
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