阶段2（下）：运维专题 Docker/Nginx/Linux/CI-CD/Git 的课程、企业场景、面试题和可运行示例

topics/devops/cicd/examples/pipeline/deploy.sh

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+#!/usr/bin/env bash
+# 不自动运行：单机 Docker Compose 部署脚本示例——拉取指定版本、健康检查、失败自动回滚
+# 用法：IMAGE_TAG=<提交哈希> ./deploy.sh
+# 约定：compose.yaml 里 api 服务的镜像写成 image: registry.example.com/app/api:${IMAGE_TAG}
+set -euo pipefail
+
+: "${IMAGE_TAG:?需要指定 IMAGE_TAG}"
+HEALTH_URL="${HEALTH_URL:-http://127.0.0.1:8080/healthz}"
+STATE_FILE="${STATE_FILE:-.deployed_tag}"
+previous="$(cat "$STATE_FILE" 2>/dev/null || true)"
+
+deploy() {
+  local tag="$1"
+  echo "部署版本 $tag"
+  IMAGE_TAG="$tag" docker compose pull api
+  IMAGE_TAG="$tag" docker compose up -d --no-deps api
+}
+
+healthy() {
+  for _ in $(seq 1 30); do
+    if curl -fsS --max-time 2 "$HEALTH_URL" >/dev/null; then
+      return 0
+    fi
+    sleep 2
+  done
+  return 1
+}
+
+deploy "$IMAGE_TAG"
+if healthy; then
+  echo "$IMAGE_TAG" > "$STATE_FILE"
+  echo "部署成功：$IMAGE_TAG"
+else
+  echo "健康检查失败" >&2
+  if [[ -n "$previous" ]]; then
+    echo "回滚到 $previous" >&2
+    deploy "$previous"
+    healthy && echo "已回滚到 $previous" >&2
+  fi
+  exit 1
+fi