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微服务运维面试题库

  • 2026-04-01 02:39:26
微服务运维面试题库

🚀 高并发微服务运维面试题库

从 0→1 搭建百万日活、27 个 Go 微服务、多云混合云题目含「专业深度解答」可直接用于公众号/二面


🏗️ 一、架构师 / 高级运维(从 0 到 1)

#
题目 & 专业解答
1
两周内交付生产级 K8s 集群的里程碑设计
背景:空白 AWS+阿里云,仅 3 台 master,两周灰度上线 27 个 Go 微服务。参考解答:• Day-0 选型:托管控制面(EKS+ACK)节省 3 台 master 费用;IaC 用 Terraform+Terragrunt;网络 AWS TGW↔阿里云 CEN;镜像 Harbor 双活;GitOps ArgoCD。• Day-1~3 网络打通:Site-to-Site VPN + BGP;DNS 统一 PrivateZone/Route53。• Day-4~7 基础集群:托管 master 高可用;3 系统节点跑 Harbor/ArgoCD/Prometheus;etcd 自动备份到 S3+OSS。• Day-8~10 CI/CD:GitLab CI 模板化;Docker Buildx 多架构;镜像签名 cosign;漏洞扫描 Trivy。• Day-11~12 可观测:Prometheus 联邦+Thanos remote-write;SLI:availability>99.9%,P99<500ms。• Day-13~14 有状态灰度:RDS MySQL 跨云 DTS 双向同步;Kafka MirrorMaker2;Redis 双写;灰度 5%→30%→100%,Argo Rollout 自动回滚。风险&回退:预算超支→改单云;控制面故障→回滚到单云;滚动失败→ArgoCD 一键 undo。
2
有状态服务灾备(RPO≤5min,RTO≤15min)
• MySQL:AWS RDS↔阿里云集 DTS 实时双向复制,延迟<2s;每 1h 快照+每 4h 逻辑备份;Operator 用 Vitess。• Redis:主从+哨兵;跨云 RedisShake 增量;业务层写双发读本地。• Kafka:MM2 topic 级复制,RF=3,min.insync.replicas=2;监控 kafka_mirror_maker_lag<5s• etcd:每 6h 快照→S3 版本桶;跨云季度演练,RTO 实测 11min。• 一键切换:Terraform workspace 切流量;RDS 只读→读写;Redis 哨兵 promote。
3
万级 Pod 规模 etcd 写延迟突增
现象:kube-apiserver 大量 etcdserver: request timed out定位:Prometheus etcd_disk_wal_fsync_duration_seconds P99=1.4s;磁盘 IOPS 耗尽;etcd raft index 落后 5k。解决:① 升 gp3 12000 IOPS;② 压缩历史数据;③ etcd 独立 NVMe 节点;④ apiserver 开 watch-cache。P99 fsync 降到 6ms。
4
Istio 注入后 RT 飙高 30%
量化:fortio 压测 baseline 20ms→Sidecar 26ms;envoy CPU 0.4core。优化:升级 1.16(去 mixer);global.proxy.concurrency=2;长连接透传 TCP。Trade-off:核心交易链路(P99<20ms)暂缓 Sidecar;边缘服务全量,节省 mTLS 开发成本。决策门:RT 增幅<10% 且错误率<0.1% 才晋级。
5
多云成本看板设计
指标:cloud_cost_usd_per_hour{provider,account,service}标签统一:namespace=team-app-env。数据流:CUR/账单 API→S3/OSS→Spark→VictoriaMetrics→Grafana。展现:总览→namespace→app→Pod→云资源 ID;预测 30 天趋势。案例:日志索引实例 32C→16C,月省 4.2k USD。
6
Helm 模板兼容单/多 AZ
同一 chart,prod 3AZ/stage 单 AZ,关键模板:yaml<br>topologySpreadConstraints:   # 仅 highAvailable=true<br>  - maxSkew: 1<br>    topologyKey: topology.kubernetes.io/zone<br>    whenUnsatisfiable: DoNotSchedule<br>affinity 硬/软约束通过 .Values.global.highAvailable 切换。
7
COE(Correction of Errors)模板
示例:2023-08-14 订单服务 502 18min,2.1k 订单失败,31k USD 损失。根因:Go JSON 无池化,CPU throttle,limit 0.5core。修正:回滚→放大 limit→sync.Pool 优化,CPU 降 45%。预防:压测 500rps 基线才能晋级;HPA maxReplicas 30→60。
8
可灰度、可观测、可回滚 10 条 checklist
1. 版本标签唯一(git sha)2. 金丝雀 5%→30%→100%,flagger 自动暂停3. 错误率>1% 或 P99>500ms 自动回滚4. Dashboard 带 version 变量5. Prometheus 记录规则 canary_error_rate{version="$new"}6. ArgoCD Synced&Healthy7. 回滚脚本 ≤120s8. 压测报告随 MR9. 灾备延迟<5s 才晋级10. on-call 人工 ✅ 才继续
9
控制面 etcd 备份与跨云恢复演练
备份:每 6h 快照 + 每天一致性校验;S3 版本桶保留 30 天。演练:季度拉练,KPI:RTO≤30min,数据零丢失。SOP:新 VPC 启动 3 台 etcd→etcdctl snapshot restore→更新 apiserver endpoints→smoke test。
10
Service Mesh ROI 计算
成本:Sidecar 内存 100MB×5k Pod=500GB≈1.2k USD/月;人力 2 人月=160k CNY。收益:节省自建 mTLS 240k CNY;APM license 50k USD/年;发布自动化省 100k CNY/年。ROI:第一年净收益 300k CNY,投资回收期 4 个月。

🔧 二、高级运维工程师(实战排障)

#
题目 & 专业解答
1
CPU 100% 无法进入容器
• kubectl top 找热点 → kubectl alpha debug 启 ephemeral container• perf top 发现 Go JSON 无池化 → 垂直扩容 2000m 先救命• 推热修复 + CI 滚动,CPU 降 45%
2
Node NotReady + PLEG unhealthy
顺序:journalctl -u kubelet → crictl pods 卡死 → restart containerd → crictl rmp --all 清僵尸 → 磁盘只读则 fsck → uncordon
3
MySQL 主从延迟 20s
监控:mysql_slave_lag_seconds > 20日志:show slave status\G 看 Seconds_Behind_MasterSQL:pt-query-digest 找无索引语句→加联合索引
4
Kafka 流量翻 5 倍 ISR shrinking
应急:扩容 Broker + 增加副本 + 调 replica.lag.time.max.ms=60s长期:提前 2× 分区 + Cruise Control 自动均衡 + 磁盘升 NVMe
5
JumpServer 0-1 部署与合规
容器化:官方 Helm;持久化 PVC;外部 RDS+Redis权限:K8s RBAC 仅 jumpserver namespace;网络仅内网 SLB审计:SESSION_RECORD=true,录像存 OSS 180 天;接入 LDAP+TOTP
6
零停机 Harbor 1.x → 2.x 迁移
老 Harbor 置只读 → pg_dump → 新 Harbor 2.x 外部 Postgres 导入 → rsync blob → harbor-migrator --db up → DNS 切换;回退保留老实例只读 24h
7
Bash 脚本:扫描 latest 镜像并飞书告警
脚本核心:kubectl get po -A -o jsonpath 过滤 latest → 飞书 webhook POSTCronJob 每日 09:00 执行,serviceAccount 仅 list pod 权限
8
7×24 on-call 三级响应 SLA
P1 核心不可用 5min/30min;P2 非核心 30min/2h;P3 一般 4h/1d升级路径:P1 15min→CTO;经济奖惩:P1 超时扣 500CNY,月度复盘
9
Docker→containerd 无损迁移
cordoned → drain → yum remove docker → 安装 containerd → 修改 kubelet 参数 --container-runtime=remote --container-runtime-endpoint=unix:///run/containerd/containerd.sock → restart kubelet → uncordon → 验证 crictl ps
10
Go Operator 场景题:ConfigMap 自动备份到 S3
kubebuilder 脚手架;Controller 监听 ConfigMap 注解 backup=enabled → 调用 AWS SDK PutObject → 更新 status.backupURL单元测试:envtest+ginkgo,覆盖率>80%

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  1. CONNECT:[ UseTime:0.000404s ] mysql:host=127.0.0.1;port=3306;dbname=f_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000547s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000234s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000228s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000537s ]
  6. SELECT * FROM `set` [ RunTime:0.000215s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000632s ]
  8. SELECT * FROM `article` WHERE `id` = 457881 LIMIT 1 [ RunTime:0.000751s ]
  9. UPDATE `article` SET `lasttime` = 1775182646 WHERE `id` = 457881 [ RunTime:0.001594s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000269s ]
  11. SELECT * FROM `article` WHERE `id` < 457881 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000459s ]
  12. SELECT * FROM `article` WHERE `id` > 457881 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008316s ]
  13. SELECT * FROM `article` WHERE `id` < 457881 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003091s ]
  14. SELECT * FROM `article` WHERE `id` < 457881 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.100664s ]
  15. SELECT * FROM `article` WHERE `id` < 457881 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.069842s ]
0.255218s