Troubleshooting

博客提到Java出现IllegalStateException,具体错误信息为Already connected,这是Java编程中可能遇到的异常情况。
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java.lang.IllegalStateException: Already connected

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Langchain-Chatchat 是一个基于 ChatGLM 等大语言模型和 Langchain 应用框架实现的开源项目,旨在构建一个可以离线部署的本地知识库问答系统。它通过检索增强生成 (RAG) 的方法,让用户能够以自然语言与本地文件、数据库或搜索引擎进行交互,并支持多种大模型和向量数据库的集成,以及提供 WebUI 和 API 服务

Optimize Windows system reliability and performance with Sysinternals IT pros and power users consider the free Windows Sysinternals tools indispensable for diagnosing, troubleshooting, and deeply understanding the Windows platform. In this extensively updated guide, Sysinternals creator Mark Russinovich and Windows expert Aaron Margosis help you use these powerful tools to optimize any Windows system’s reliability, efficiency, performance, and security. The authors first explain Sysinternals’ capabilities and help you get started fast. Next, they offer in-depth coverage of each major tool, from Process Explorer and Process Monitor to Sysinternals’ security and file utilities. Then, building on this knowledge, they show the tools being used to solve real-world cases involving error messages, hangs, sluggishness, malware infections, and much more. Windows Sysinternals creator Mark Russinovich and Aaron Margosis show you how to: Use Process Explorer to display detailed process and system information Use Process Monitor to capture low-level system events, and quickly filter the output to narrow down root causes List, categorize, and manage software that starts when you start or sign in to your computer, or when you run Microsoft Office or Internet Explorer Verify digital signatures of files, of running programs, and of the modules loaded in those programs Use Autoruns, Process Explorer, Sigcheck, and Process Monitor features that can identify and clean malware infestations Inspect permissions on files, keys, services, shares, and other objects Use Sysmon to monitor security-relevant events across your network Generate memory dumps when a process meets specified criteria Execute processes remotely, and close files that were opened remotely Manage Active Directory objects and trace LDAP API calls Capture detailed data about processors, memory, and clocks Troubleshoot unbootable devices, file-in-use errors, unexplained communication, and many other problems Understand Windows core concepts that aren’t well-documented elsewhere Table of Contents PART I: GETTING STARTED Chapter 1 Getting started with the Sysinternals utilities Chapter 2 Windows core concepts Chapter 3 Process Explorer Chapter 4 Autoruns PART II: USAGE GUIDE Chapter 5 Process Monitor Chapter 6 ProcDump Chapter 7 PsTools Chapter 8 Process and diagnostic utilities Chapter 9 Security utilities Chapter 10 Active Directory utilities Chapter 11 Desktop utilities Chapter 12 File utilities Chapter 13 Disk utilities Chapter 14 Network and communication utilities Chapter 15 System information utilities Chapter 16 Miscellaneous utilities PART III: TROUBLESHOOTING—“THE CASE OF THE UNEXPLAINED…” Chapter 17 Error messages Chapter 18 Crashes Chapter 19 Hangs and sluggish performance Chapter 20 Malware Chapter 21 Understanding system behavior Chapter 22 Developer troubleshooting
### 什么是 Troubleshooting 镜像? Troubleshooting 镜像是一种专门用于系统故障排查的容器镜像,通常基于一个轻量级操作系统(如 CentOS、Alpine 等),并预装了多种诊断和调试工具。该镜像被设计为在出现问题的环境中快速启动,帮助运维人员进行网络诊断、日志查看、进程追踪、权限检查等操作。 此类镜像常见于 Kubernetes 或 Docker 环境中,用于排查容器无法启动、服务异常、网络不通等问题。通过运行 Troubleshooting 容器,可以访问宿主机的命名空间或挂载相关卷,从而获取更全面的系统信息[^1]。 ### 如何使用 Troubleshooting 镜像? #### 1. 构建 Troubleshooting 镜像 首先,创建一个包含必要工具的 Dockerfile,例如: ```Dockerfile FROM centos:7 LABEL maintainer="admin@example.com" RUN yum update -y && \ yum install -y net-tools iproute tcpdump curl wget vim strace ltrace gdb && \ yum clean all WORKDIR /root/ COPY entrypoint.sh /entrypoint.sh RUN chmod +x /entrypoint.sh ENTRYPOINT ["/entrypoint.sh"] ``` 接着编写 `entrypoint.sh` 脚本以设置初始环境: ```bash #!/bin/bash echo "Starting troubleshooting container..." exec "$@" ``` 然后执行构建命令: ```bash docker build -t troubleshoot-centos7 . ``` #### 2. 运行 Troubleshooting 容器 启动容器时可挂载宿主机的文件系统、网络命名空间等资源,以便进行深度排查: ```bash docker run -it --rm \ --privileged \ --net=host \ --pid=host \ -v /:/host \ troubleshoot-centos7 bash ``` 其中: - `--privileged` 提供容器对宿主机硬件的完全访问权限; - `--net=host` 共享宿主机网络命名空间; - `-v /:/host` 挂载宿主机根目录到 `/host`; - `--pid=host` 允许访问宿主机的进程信息。 #### 3. 使用内置工具进行排查 进入容器后,可以使用如下常用工具进行故障分析: - **网络诊断**:`tcpdump`, `ping`, `traceroute`, `nslookup` - **系统监控**:`top`, `htop`, `iostat`, `vmstat` - **日志查看**:`journalctl`, `dmesg`, `cat /var/log/messages` - **进程跟踪**:`strace`, `ltrace`, `gdb` - **文件与权限检查**:`ls`, `find`, `chmod`, `chown` #### 4. 常见用途场景 - **Pod ImagePullBackOff 问题排查**:可使用 `docker pull` 测试镜像拉取是否正常,并检查网络配置、代理设置、私有仓库认证等。 - **容器运行异常**:通过 `strace` 跟踪容器内进程调用栈,定位卡顿或崩溃原因。 - **节点资源不足**:使用 `top`、`df`、`free` 等命令分析 CPU、内存、磁盘使用情况。 - **Kubernetes 网络问题**:利用 `tcpdump` 抓包分析 Pod 间通信问题。 #### 5. 注意事项 - 确保 Troubleshooting 镜像体积适中,避免因安装过多工具导致部署效率下降。 - 若需从外部仓库拉取基础镜像,应确保网络连通性及代理配置正确。 - 在生产环境中使用时,建议限制容器权限,防止安全风险。 --- ###
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