This repository is the author's technical notes from daily system operations. The author often has opportunities to perform various system operations, including many PoCs, new system validations, and solution explorations, which provide numerous chances for practical system operations involving operating system installations, IaaS and PaaS platform setups, middleware system validations, and application development and validation. Many operational steps are quite complex; therefore, a centralized place for note-taking is needed to facilitate personal organization and immediate online sharing.
Currently, there are many experience sharing articles in the warehouse, some of which are quite useful:
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2026
- 2026.05 kvm guest nic performance optimization
- 2026.05 ROSA custom metrics from aws infra
- 2026.04 ocp network observ and ovn egress firewall
- 2026.04 quay passthrough cache for ocp 4.20
- 2026.03 RHBK+AD+Guacamole auto-login with LDAP
- 2026.03 Add API VIP for OpenShift 4.19
- 2026.03 BGP-Based Ingress Service in OpenShift 4.19 with OVN-Kubernetes and MetalLB
- 2026.03 BGP-Based Egress Service in OpenShift 4.19 with OVN-Kubernetes
- 2026.03 BGP-Based Egress Service in OpenShift 4.19 with OVN-Kubernetes and MetalLB
- 2026.03 BGP-Based Egress IP in OpenShift 4.19 with OVN-Kubernetes
- 2026.01 OVN EgressIP Limitation Workaround (internal gateway pod)
- 2026.01 OVN EgressIP Limitation Workaround (external gateway vm)
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2025
- 2025.12 MCCL IB Debug Slides
- 2025.11 Implementing Layer 4 Switch as Ingress Gateway for OpenShift: Challenges and Solutions
- 2025.11 Deploying Dify on OpenShift 4.18 with Helm
- 2025.11 ocp dr with oadp plugin
- 2025.10 Mitigating etcd Pressure with API Server Throttling
- 2025.10 list pods which will restart when cert rotation
- 2025.10 list all pods needs tls cert
- 2025.10 get secrets which contains tls cert
- 2025.10 metax gpu onboarding
- 2025.09 vllm/rhaiis profiling
- 2025.09 layered rhcos to install rsyslog
- 2025.08 openshift workload partition
- 2025.07 nfs permission issue on ocp
- 2025.07 ocp-v DR with oadp based on storage system directly
- 2025.07 expose kube-api, router through metalLB on 2nd network
- 2025.07 kubelet client pem rotation analysis
- 2025.06 ocp hcp over ocp-v
- 2025.05 ansible platform integrate with service.now
- 2025.05 openshift pipeline without github webhook & using new image tag
- 2025.04 Machine Config Operator Certificate/Key Rotation Logic Comparing between 4.12 and 4.16
- 2025.04 using AI tools to analyze opensource project
- 2025.03 rhbk-26 performance testing
- 2025.03 compliance operator
- 2025.02 rhdh 1.4 permission with conditional policy
- 2025.01 run llama factory on ocp ai
- 2025.01 run mini llm on ocp ai
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2024
- 2024.12 openshift 4.16 integration with Azure SSO without group sync operator
- 2024.12 openshift 4.16 integration with Azure SSO with group sync operator
- 2024.12 backup etcd with cronjob
- 2024.12 redhat developer hub integration with azure devops
- 2024.11 using gitops/aap to collect heap dump
- 2024.10 rhsso 7.1 performance issues troubleshooting
- 2024.09 using keepalived as a sidecar to maintain VIP for pods
- 2024.08 apply settings belongs with worker profile
- 2024.08 redhat developer hub (1.2) based on a book
- 2024.07 cnv + ovn on 2nd network + multi-network policy
- 2024.06 run openssh sftp service in k8s/ocp
- 2024.05 java app multiple log/dump files persistent
- 2024.05 redhat developer hub integrate with azure devops
- 2024.05 cryostat usage
- 2024.04 opentelementry usage
- 2024.04 TensorRT-LLM 使用 openai api 来推理
- 2024.04 netobserv ocp network observabiltiy
- 2024.03 nginx operator usage
- 2024.02 llama code 配合 vscode 做代码补全 nvidia jetson 版本
- 2024.02 llama code 配合 vscode 做代码补全 openshift AI 版本
- 2024.02 llama code 配合 vscode 做代码补全 openshift 版本
- 2024.01 llama code 配合 vscode 做代码补全 rhel 版本
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openshift4 安装系列
- 如何获得 openshift4 免费下载密钥
- openshift4 离线安装介质的制作
- openshift4 rhel7物理机 baremetal UPI模式 离线安装
- openshift4 rhel8物理机 baremetal UPI模式 离线安装
- openshift4 物理机 baremetal IPI模式 离线安装 单网络模式
- openshift4 物理机 baremetal IPI模式 离线安装 双网络模式
- nvidia gpu for openshift 4.6 disconnected 英伟达GPU离线安装
- openshift4 初始安装后 补充镜像
- openshift4 补充samples operator 需要的 image stream
- openshift4 calico 离线部署
- openshift4 尝鲜 cilium CNI
- openshift4 集群升级
- 缩小根分区 / sysroot 的大小
- 部署升级服务 完善离线升级功能
- 添加 win10 worker 节点
- 2022.02 assist install 联线模式下 单节点ocp 无需dhcp 静态ip部署
- 2022.02 assist install 离线模式下 单节点ocp 无需dhcp 静态ip部署
- 单节点ocp 安装 无需dhcp 静态ip部署
- 2022.04 IPI模式 单节点 离线 单网络模式 安装
- 2022.04 ACM zero touch provision 远程单节点集群 全自动安装
- 2022.04 coreos 启动和分区挂载分析
- 2022.05 openshift4 单节点 命令行安装
- 2022.05 openshift4 单节点 在第一块硬盘上添加更多分区
- 2022.05 openshift4 单节点 使用 lvm 和 nfs 在集群内提供存储
- 2022.05 openshift4 单节点 从centos7/8 开始安装
- 2022.05 openshift4 单节点 安装精简版 ODF/ceph
- 2022.08 定制 rhcos
- 2022.08 rhcos 里面安装 rpm
- 2022.09 openshift 4 组件版本
- 2022.09 内嵌 dns, haproxy, registrty
- 2022.12 升级 openshift 4.10 内核到 rhel 9.1 支持 海光 x86 cpu
- 2023.01 使用 hypershift 安装控制面托管的 openshift 集群
- 2023.04 使用 agent based installer 安装 3 节点集群
- 2023.04 使用 agent based installer 安装 单节点集群
- 2023.05 在 openshift 内部编译内核驱动 rpm 并使用
- 2023.06 how to build an openshift 4.12 demo lab from scratch
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openshift4 使用系列
- 2023.12 在openshift 4.13 上运行 LLM RAG 应用
- 2022.11 在 openshift 4.11 上安装和运行 openstack
- 2022.06 在 openshift4 上运行 OpenRAN 无线基站应用
- 2022.05 openshift4 可视化 ovs netflow
- 2022.05 intel o-ran flexran 方案在openshift4上的安装和使用
- 2022.01 ci/cd pipeline gitops演示
- 2021.12 oc exec 原理分析
- 2021.12 nf_conntrack 在 openshift4.9上的处理
- 2021.12 加载第三方设备驱动
- 2021.12 helm chart/helm operator
- 使用 MetalLB 用 Layer2 发布 LoadBalancer
- 使用 MetalLB 用 BGP 发布 LoadBalancer
- kata / 沙盒容器
- 在非官方支持的网卡上，测试SRIOV/DPDK
- 使用 keepalived 激活 LoadBalancer 服务类型
- 在节点上启用实时操作系统 real-time kernel
- 从容器向宿主机注入内核模块 kmod / driver
- GPU/vGPU 共享
- openshift headless service讲解
- openshift volumn 存储的各种测试
- openshift 设置 SupportPodPidsLimit 解除 pids 限制
- openshift4 配置 SSO 点单认证
- openshift4 SCC 相关安全能力测试
- openshift4 从 node not ready 状态恢复
- openshift4 QoS 能力
- openshift4 QoS 在流量压力下的表现
- openshift4 使用 image proxy 来下载镜像
- openshift4 NUMA 绑核测试
- openshift4 Network Policy 测试
- openshift4 网络多播 测试
- openshift4 配置节点防火墙
- openshift4 集成 ldap
- openshift4 维护 image pull secret
- openshift4 使用大页内存 huge page
- openshift4 使用 helm
- openshift4 定制router 支持 TCP ingress
- openshift4 监控能力展示 grafana
- openshift4 CPU 绑核 测试
- openshift4 build config & hpa 自动化编译和自动扩缩容
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应用上云系列教程 CCN
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红帽其他产品系列
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操作系统相关
- 2023.06 红帽断供centos的思考
- 2023.05 satellite 红帽注册和内容分发代理
- 2023.04 RHEL 订阅在线注册相关问题
- 2022.12 通过新增系统启动项来原地重装操作系统
- 2022.04 Relax and Recover(ReaR) 系统备份和灾难恢复
- 2022.04 红帽免费的开发者订阅申请和使用
- 2022.01 在红帽官网查询rpm属于哪个repo
- 2022.01 离线环境下 原地升级 rhel7->rhel8
- 2022.01 系统启动自动加载sysctl配置
- 2021.12 Mellanox BF2 刷固件并测试DPI URL-filter场景
- 2021.11 mellanox BF2 网卡激活snap功能， 配置nvme over fabrics 支持
- 2021.11 Mellanox CX6 vdpa 硬件卸载 ovs-kernel 方式
- RHEL8编译定制化内核
- 检查OS是否是运行在虚拟机上
- 两个主机用ovs组网
- CentOS Stream是什么
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优秀的workshop
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POC
-
OSX使用技巧
Redhat Blog:
- Profiling vLLM Inference Server with GPU acceleration on RHEL
- Analysis of OpenShift node-system-admin-client lifespan
- Integrate Azure DevOps into Red Hat Developer Hub workflows
Redhat learning:
- Customizing RHCOS with CoreOS Layering to Add the rsyslog Package
- OpenShift Workload Partitioning Deep Dive
- Red Hat OpenShift Virtualization disaster recovery
作者还有很多视频演示，欢迎前往作者的频道订阅
The code involved in this project is licensed under the GNU V3 license.
This project is licensed under the CC-BY-NC-SA 4.0 agreement. Commercial reproduction must obtain authorization from the author wangzheng422; when reproducing, be sure to indicate the source. The author reserves the final interpretation rights and legal pursuit rights.