254 lines
8.2 KiB
Bash
Executable File
254 lines
8.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# 零停机部署：同步代码 → 构建不可变镜像 → 蓝绿滚动 → 常驻代理切换
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#
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# ./deploy.sh 拉 GIT_BRANCH（默认 main）+ 只更新后端
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# ./deploy.sh all 前后端都更新
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# ./deploy.sh web 只更新前端
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# ./deploy.sh --rollback 切回上一个槽（不动代码，秒级）
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# ./deploy.sh all --no-pull 用服务器上现有代码构建
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# ./deploy.sh --prune 只清理旧镜像（保留最近 KEEP_IMAGES 个，默认 5）
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# GIT_BRANCH=dev ./deploy.sh all 临时指定分支（优先于 .env）
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#
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# 每次发布生成 RELEASE=<时间戳>-<后端提交号>，镜像以此打标签（不可变，不覆盖历史）。
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# 发布记录写在 .deploy/releases.log；每个槽跑的是哪个 RELEASE 可用 docker inspect 查。
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set -euo pipefail
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cd "$(dirname "$0")"
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TARGET="backend"
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NO_PULL=0
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PRUNE_ONLY=0
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for arg in "$@"; do
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case "$arg" in
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backend|web|all) TARGET="$arg" ;;
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--rollback) TARGET="rollback" ;;
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--no-pull) NO_PULL=1 ;;
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--prune) PRUNE_ONLY=1 ;;
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*) echo "用法: ./deploy.sh [backend|web|all|--rollback|--prune] [--no-pull]"; exit 1 ;;
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esac
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done
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[ -f .env ] || { echo "!! 缺少 .env：先 cp .env.example .env 并填写"; exit 1; }
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# 命令行显式传入的分支优先于 .env（.env 会覆盖同名 shell 变量，所以先记下来）
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CLI_GIT_BRANCH="${GIT_BRANCH-}"
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set -a; . ./.env; set +a
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[ -n "$CLI_GIT_BRANCH" ] && GIT_BRANCH="$CLI_GIT_BRANCH"
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GIT_BRANCH="${GIT_BRANCH:-main}"
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KEEP_IMAGES="${KEEP_IMAGES:-5}"
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WEB_DIR="${WEB_DIR:-../test}"
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STATE_DIR=".deploy"
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ACTIVE_CONF="$STATE_DIR/nginx/active.conf"
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PORT="${HTTP_PORT:-80}"
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mkdir -p "$STATE_DIR/nginx"
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cur_slot() { cat "$STATE_DIR/$1" 2>/dev/null || echo a; }
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other_slot() { [ "$1" = a ] && echo b || echo a; }
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short_sha() { [ -d "$1/.git" ] && git -C "$1" rev-parse --short HEAD 2>/dev/null || echo "nogit"; }
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# ---- 发布号 ----
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# 时间戳 + 后端提交号：一眼看出线上跑的是哪个提交，同一秒重复执行也不会撞标签。
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new_release() { echo "$(date +%Y%m%d-%H%M%S)-$(short_sha .)"; }
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record_release() {
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[ -n "${RELEASE:-}" ] || return 0
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printf '%s %s 后端=%s 前端=%s (%s)\n' \
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"$RELEASE" "$(date '+%F %T')" \
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"$(short_sha .)" "$(short_sha "$WEB_DIR")" "$TARGET" \
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>> "$STATE_DIR/releases.log"
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}
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# 生成切换文件（写到 .deploy/，不进版本库）：backend / web 各自独立的活跃槽
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render_active() {
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local b w
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b=$(cur_slot backend); w=$(cur_slot web)
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cat > "$ACTIVE_CONF" <<EOF
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# ⚠️ 由 deploy.sh 生成，勿手改
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map \$host \$web_up { default "web_${w}:3000"; }
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map \$host \$api_up { default "backend_${b}:8090"; }
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map \$host \$ssg_up { default "backend_${b}:8091"; }
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map \$host \$admin_up { default "backend_${b}:8092"; }
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EOF
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}
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# ---- 代码同步 ----
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sync_repo() { # $1=目录 $2=展示名
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local dir=$1 label=$2 cur
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if [ ! -d "$dir/.git" ]; then
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echo " $label：不是 git 仓库，跳过（$dir）"
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return 0
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fi
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cur=$(git -C "$dir" rev-parse --abbrev-ref HEAD 2>/dev/null || echo "?")
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git -C "$dir" fetch --prune origin "$GIT_BRANCH"
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if [ "$cur" != "$GIT_BRANCH" ]; then
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echo " $label：当前在 $cur，切到 $GIT_BRANCH"
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git -C "$dir" checkout "$GIT_BRANCH"
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fi
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if ! git -C "$dir" pull --ff-only origin "$GIT_BRANCH" >/dev/null 2>&1; then
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echo " !! $label 无法快进到 origin/$GIT_BRANCH（服务器上有本地提交或未提交改动）"
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echo " git -C $dir status 查看；确认可丢弃后：git -C $dir reset --hard origin/$GIT_BRANCH"
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exit 1
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fi
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echo " $label：$GIT_BRANCH @ $(short_sha "$dir") $(git -C "$dir" log -1 --pretty=%s | cut -c1-40)"
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}
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sync_code() {
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echo "==> 同步代码（分支 ${GIT_BRANCH}）"
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sync_repo "." "后端"
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sync_repo "$WEB_DIR" "前端"
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}
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# ---- 容器与槽位 ----
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cid() { docker compose ps -q "$1" 2>/dev/null || true; }
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healthy() {
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local c
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c=$(cid "$1"); [ -n "$c" ] || return 1
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[ "$(docker inspect -f '{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}' "$c" 2>/dev/null)" = healthy ]
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}
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slot_image() { # 槽正在跑的镜像标签
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local c
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c=$(cid "$1"); [ -n "$c" ] || return 1
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docker inspect -f '{{.Config.Image}}' "$c" 2>/dev/null
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}
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wait_healthy() { # $1=服务名 $2=超时秒
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local i
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for ((i = 0; i < $2; i++)); do
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healthy "$1" && return 0
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sleep 1
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done
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return 1
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}
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reload_proxy() {
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docker compose exec -T proxy nginx -t >/dev/null
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docker compose exec -T proxy nginx -s reload
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local i
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for ((i = 0; i < 10; i++)); do
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sleep 1
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if curl -fsS "http://127.0.0.1:${PORT}/healthz" >/dev/null 2>&1; then
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return 0
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fi
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done
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echo "!! 代理 reload 后健康检查失败"
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return 1
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}
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switch_to() { # $1=component $2=slot
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echo " → 切换 $1 到槽 $2"
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echo "$2" > "$STATE_DIR/$1"
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render_active
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reload_proxy
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}
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roll() { # $1=component(backend|web)
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local comp=$1 old idle
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old=$(cur_slot "$comp"); idle=$(other_slot "$old")
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echo "==> $comp：活跃槽 $old，更新空闲槽 $idle（镜像 $RELEASE）"
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docker compose build "${comp}_a" >/dev/null
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# latest 只是给手动执行 compose 命令用的便利别名，deploy 自己从不依赖它
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docker tag "fashion-${comp}:${RELEASE}" "fashion-${comp}:latest" 2>/dev/null || true
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echo " 重建 ${comp}_${idle}"
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docker compose up -d --no-deps --force-recreate "${comp}_${idle}"
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if ! wait_healthy "${comp}_${idle}" 120; then
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echo "!! ${comp}_${idle} 120 秒未 healthy，保持旧槽继续服务"
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docker compose logs --tail 40 "${comp}_${idle}"
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exit 1
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fi
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switch_to "$comp" "$idle"
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echo " 完成：旧槽 $old 仍在运行（$(slot_image "${comp}_${old}" 2>/dev/null || echo '未知镜像')）"
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}
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do_rollback() {
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local comp old other img
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for comp in backend web; do
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old=$(cur_slot "$comp"); other=$(other_slot "$old")
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if healthy "${comp}_${other}"; then
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img=$(slot_image "${comp}_${other}" 2>/dev/null || echo "未知")
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switch_to "$comp" "$other"
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echo " 回滚 $comp：$old → $other（该槽镜像 ${img}）"
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else
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echo " $comp：槽 $other 不可用，跳过（可能还没发布过第二次）"
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fi
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done
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}
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prune_images() {
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local comp tags t
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echo "==> 清理旧镜像（每个组件保留最近 ${KEEP_IMAGES} 个）"
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for comp in backend web; do
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tags=$(docker images "fashion-${comp}" --format '{{.Tag}}' 2>/dev/null \
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| grep -vE '^(latest|<none>)$' | sort -r | tail -n +$((KEEP_IMAGES + 1)))
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[ -z "$tags" ] && { echo " $comp：无需清理"; continue; }
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for t in $tags; do
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if docker rmi "fashion-${comp}:${t}" >/dev/null 2>&1; then
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echo " $comp：删除 $t"
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else
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echo " $comp：$t 仍被容器使用，跳过"
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fi
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done
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done
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}
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# ---- 主流程 ----
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if [ "$PRUNE_ONLY" = "1" ]; then
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prune_images
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exit 0
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fi
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if [ "$TARGET" != "rollback" ]; then
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export RELEASE="${RELEASE:-$(new_release)}"
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echo "==> 发布号 $RELEASE"
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if [ "$NO_PULL" = "0" ]; then
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sync_code
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else
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echo "==> 跳过拉代码（--no-pull）"
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fi
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else
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export RELEASE="${RELEASE:-latest}"
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fi
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# 首次部署：先写切换点，再只启动代理。
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# - render_active 必须先于 proxy 启动，否则 include 的 map 为空，nginx 会因未知变量启动失败。
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# - --no-deps 避免首次起代理时顺带构建前端（此时 18091 尚未就绪，SSG 取数会失败）。
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render_active
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if ! healthy proxy; then
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echo "==> 启动代理（首次只起代理，槽位由 roll 流程构建）"
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docker compose up -d --no-deps proxy
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fi
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if [ "$TARGET" = "rollback" ]; then
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do_rollback
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exit 0
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fi
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# 顺序有讲究：先切后端（前端构建期要读活跃后端的 SSG），再切前端
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case "$TARGET" in
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backend) roll backend ;;
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web) roll web ;;
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all)
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roll backend
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roll web
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;;
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esac
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record_release
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echo "==> 代理检查"
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if curl -fsS "http://127.0.0.1:${PORT}/healthz" >/dev/null 2>&1; then
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echo " 正常"
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else
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echo " !! /healthz 不通，请检查 docker compose logs proxy"
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exit 1
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fi
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docker image prune -f >/dev/null
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echo "完成：$RELEASE"
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echo "旧镜像可用 ./deploy.sh --prune 清理（默认保留最近 ${KEEP_IMAGES} 个）"
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