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Chapter 21. Troubleshooting
This chapter covers common problems and solutions for Red Hat Enterprise Linux 6 virtualization issues.
Read this chapter to develop an understanding of some of the common problems associated with virtualization technologies. Troubleshooting takes practice and experience which are difficult to learn from a book. It is recommended that you experiment and test virtualization on Red Hat Enterprise Linux 6 to develop your troubleshooting skills.
If you cannot find the answer in this document there may be an answer online from the virtualization community. Refer to Section B.1, “Online Resources” for a list of Linux virtualization websites.
21.1. Debugging and Troubleshooting Tools
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This section summarizes the System Administrator applications, the networking utilities, and debugging tools. You can employ these standard System administration tools and logs to assist with troubleshooting:
kvm_stat- refer to Section 21.4, “kvm_stat”trace-cmdftraceRefer to the Red Hat Enterprise Linux Developer Guidevmstatiostatlsofsystemtapcrashsysrqsysrq tsysrq w
These networking tools can assist with troubleshooting virtualization networking problems:
ifconfigtcpdumpThetcpdumpcommand 'sniffs' network packets.tcpdumpis useful for finding network abnormalities and problems with network authentication. There is a graphical version oftcpdumpnamedwireshark.brctlbrctlis a networking tool that inspects and configures the Ethernet bridge configuration in the Linux kernel. You must have root access before performing these example commands:Copy to Clipboard Copied! Toggle word wrap Toggle overflow
Listed below are some other useful commands for troubleshooting virtualization.
- strace is a command which traces system calls and events received and used by another process.
- vncviewer: connect to a VNC server running on your server or a virtual machine. Install vncviwer using the
yum install tigervnccommand. - vncserver: start a remote desktop on your server. Gives you the ability to run graphical user interfaces such as virt-manager via a remote session. Install vncserver using the
yum install tigervnc-servercommand.
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