Book Image

VMware vSphere Troubleshooting

Book Image

VMware vSphere Troubleshooting

Overview of this book

VMware vSphere is the leading server virtualization platform with consistent management for virtual data centers. It enhances troubleshooting skills to diagnose and resolve day to day problems in your VMware vSphere infrastructure environment. This book will provide you practical hands-on knowledge of using different performance monitoring and troubleshooting tools to manage and troubleshoot the vSphere infrastructure. It begins by introducing systematic approach for troubleshooting different problems and show casing the troubleshooting techniques. You will be able to use the troubleshooting tools to monitor performance, and troubleshoot issues related to Hosts and Virtual Machines. Moving on, you will troubleshoot High Availability, storage I/O control problems, virtual LANS, and iSCSI, NFS, VMFS issues. By the end of this book, you will be able to analyze and solve advanced issues related to vShpere environment such as vcenter certificates, database problems, and different failed state errors.
Table of Contents (16 chapters)
VMware vSphere Troubleshooting
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Installing VMware vRealize Operations Manager
Power CLI - A Basic Reference
Index

Log files


You can find information about all DHCP-related issues in the /var/log/dhclient.log file. The file includes information about how a VMkernel interface acquires an IP address and how it performs the renewal. In the following screenshot, you can see DHCPREQUEST, DHCPDISCOVER on vmk0 messages to be broadcasted.

Initially, a DHCPDISCOVER broadcast message is sent by the VMkernel client interface. The DHCPDISCOVER message then tries to look around for a DHCP server, and if found, the VMkernel client interface requests for an IP address. You can see in the screenshot, the broadcast request is being sent on 255.255.255.255. If no DHCP server is available to offer a lease, you will see a No DHCPOFFERS received message once it times out. If a DHCP offer has been made by a DHCP server, the server will send a unicast message of DHCPOFFERS to the client.

The vSphere client tries to renew its DHCP state and unicasts a DHCPREQUEST to the DHCP server at a time interval of interval1 multiplied by...