Linux Patch Management: Keeping Linux Systems Up To Date
Here are some of the key points from the certification objectives in Chapter 16. Troubleshooting Strategies
| ❑ | During the Troubleshooting and System Maintenance exam, use your experience. You may have seen the problem before. |
| ❑ | If you aren't sure about a problem, try the simplest solution first. q If all else fails, use the scientific method. |
| ❑ | Know how to boot Linux into different runlevels; it can help you bypass many problems and boot a system. |
| ❑ | RHCE candidates should also know how to boot Linux from the first installation CD, using linux rescue mode. |
Required RHCT Troubleshooting Skills
| ❑ | Misconfigured networking can be diagnosed with key commands such as ifconfig and ping. It can be corrected in related configuration files or with the Red Hat Network Configuration tool. |
| ❑ | Misconfigured hostname resolution problems relate to connections to /etc/ hosts or DNS servers. |
| ❑ | Configure the X Window System using the Red Hat Display Configuration tool, commands such as Xorg -configure, or by directly editing /etc/X11/xorg.conf. |
| ❑ | Configure a desktop environment and login manager with key configuration files such as /etc/X11/prefdm and /etc/X11/xinit/xinitrc. |
Required RHCE Troubleshooting Skills
| ❑ | Knowing how to diagnose and correct boot failures means knowing the GRUB configuration file and command line. |
| ❑ | Understand how to manage boot modules with the correct initial RAM disk. |
| ❑ | If there are filesystem errors, they may show up during the boot process and require that you use commands such as fsck to diagnose and solve them. |
| ❑ | Adding, removing, and resizing LVs require skills described in detail in Chapter 8. |
| ❑ | Know how to diagnose and solve service issues as described throughout this book. |
| ❑ | Use the Setroubleshoot browser to diagnose network service problems related to SELinux. |