Terraform + Gitlab CI简单集成方案

2022-07-06 17:40:19 浏览数 (1)

一 背景

利用Gitlab CI实现基础设施编排自动化，用户后续针对基础设施的管理使用Gitlab完成，提交基础设施变更后，会出发pr进行Gitlab CI流水线执行，从而实现基础设施DevOPS流程。

二 流程架构

2.1 架构图

2.2 流程

运维研发编写目标云的基于Terraform的资源清单文件，同事项目内管理Gitlab CI流程，在K8s不同NS下注册有对应的runner，当在不同分支下可以触发不同ns下的CI流程。

  1. 开发或运维人员提交代码。
  2. 部署在对应名称空间下的runner执行流程，创建运行单个Stage的POD来运行Terraform对应命令，例如init/fmt/play/apply等。
  3. 如果要对云上资源进行变更，修改代码，再次提交pr，出发更新流水线。
  4. 如果需要销毁，根据CI文件配置提交BUILD为destroy，触发云上销毁动作。

三 预置条件

  • Gitlab 服务器
  • 注册有项目的gitlab-runner
  • K8s集群
  • 腾讯云AK账号

四 配置

4.1 Gitlab CI配置

4.1.1 .gitlab.yaml
代码语言：javascript复制
variables:
  # PHASE: BUILD|DESTROY
  PHASE: DESTROY
#  PROXY: http://squiduser:xxzx789@43.134.199.162:3128
#  PROXY: http://squiduser:xxzx789@43.154.230.17:3128
  REGION: "ap-guangzhou"
  PLAN_JSON: plan.json
  BACKEND_CONF: "backend_oss.conf"


#

before_script:
#  - apk add --no-cache curl git jq
  - apk add --no-cache jq
  - export http_proxy=${SQUID_PROXY}
  - export https_proxy=${SQUID_PROXY}
  - export TENCENTCLOUD_SECRET_KEY=${TENCENTCLOUD_SECRET_KEY}
  - export TENCENTCLOUD_SECRET_ID=${TENCENTCLOUD_SECRET_ID}
  - export TF_REGISTRY_CLIENT_TIMEOUT=120000
  - export CHECKPOINT_TIMEOUT=500000
  - export TF_REGISTRY_DISCOVERY_RETRY=5
  - alias convert_report="jq -r '([.resource_changes[]?.change.actions?]|flatten)|{"create":(map(select(.=="create"))|length),"update":(map(select(.=="update"))|length),"delete":(map(select(.=="delete"))|length)}'"

# 配置缓存
cache:
  paths:
    - ${CI_PROJECT_DIR}/.terraform/*

stages:
  - init
  - validate
  - plan
  - deploy

Init:
  image:
    name: hashicorp/terraform:0.14.0
    entrypoint: [""]
  stage: init
  retry:
    max: 2
    when:
      - script_failure
  tags:
    - gitlab-runner-k8s-new
  script:
    - terraform version
    - terraform init -backend-config=${BACKEND_CONF}
  only:
    - dev

Validate:
  image:
    name: hashicorp/terraform:0.14.0
    entrypoint: [""]
  stage: validate
  tags:
    - gitlab-runner-k8s-new
  retry: 2
  script:
    - terraform init -backend-config=${BACKEND_CONF}
    - terraform validate
    - terraform fmt -check -recursive || echo 0
  cache:
    paths:
      - ${CI_PROJECT_DIR}/.terraform/*
    policy: pull
  allow_failure: true

Plan:
  image:
    name: hashicorp/terraform:0.14.0
    entrypoint: [""]
  stage: plan
  retry: 2
  tags:
    - gitlab-runner-k8s-new
  artifacts:
    paths:
      - plan.bin
      - app_config.zip
    expire_in: 2 week
  script:
    - terraform init -backend-config=${BACKEND_CONF}
    - terraform plan -input=false -out=plan.bin -var region=${REGION}
    - terraform show --json "plan.bin" | convert_report > ${PLAN_JSON}
    - cat ${PLAN_JSON}
  only:
    variables:
      - $PHASE == "BUILD"

Apply:
  image:
    name: hashicorp/terraform:0.14.0
    entrypoint: [""]
  when: manual
  stage: deploy
  retry: 2
  tags:
    - gitlab-runner-k8s-new
  script:
    - terraform init -backend-config=${BACKEND_CONF}
    - terraform apply -auto-approve -input=false plan.bin
  only:
    variables:
      - $PHASE == "BUILD"
  environment:
    name: snunv

Destroy:
  image:
    name: hashicorp/terraform:0.14.0
    entrypoint: [""]
  stage: deploy
  retry: 2
  tags:
    - gitlab-runner-k8s-new
  script:
    - terraform init -backend-config=${BACKEND_CONF}
    - terraform destroy -auto-approve -var region=${REGION}
  only:
    variables:
      - $PHASE == "DESTROY"
4.1.2 环境配置

利用Gitlab CI/CD的Environment进行环境管理。

4.2 Terraform资源

代码语言：javascript复制
provider "tencentcloud" {
  region = var.region
}

terraform {
  required_providers {
    tencentcloud = {
      source  = "registry.terraform.io/tencentcloudstack/tencentcloud"
      version = ">=1.61.5"
    }
  }
  backend "cos" {}
}
# 输入变量
variable "region" {
  type = string
}

# 再次仅为一个查询示例
data "tencentcloud_instances" "cvm" {
}

# 输出
output "result" {
  value = {
    cvm_result = { for k, v in data.tencentcloud_instances.cvm : k => v },
    count      = data.tencentcloud_instances.cvm.instance_list[*]
  }
}

为了terraform后端backend安全，将其存储为单独文件，可不同分支或环境进行修改

代码语言：javascript复制
region = "ap-beijing"
bucket = "tfproject-1253329830"
prefix = "samxxxxitlab/dexxxxxt"

五 测试

  • init
  • validate
  • Plan
  • 手动应用apply

查看应用创建出的vpc

  • 制品下载
  • 销毁

修改gitlabci文件，销毁

git 运维 kubernetes

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