Section 11.6. Solutions Fast Track

11.6. Solutions Fast Track

11.6.1.

11.6.1.1. Understanding the ESX Server File and Directory Structure

The directory structure is very similar to a standard Linux installation.

Virtual machine configuration files should be stored in the home directory of the user who will manage them, or a logical directory structure should be created for storing the configuration files. This will help to organize files so that security can be set appropriately for users and groups who will manage the Virtual Machines.

Understanding the directory structure can help with the troubleshooting process because you will know the location of critical files and directories.

11.6.1.2. The ESX Server Boot Process

ESX Server uses a modified version of Red Hat Linux 7.2 for booting and running the service console.

ESX Server uses LILO as the boot loader. Configuration settings for LILO are stored in the /etc/lilo.conf file.

The default runlevel for ESX Server is runlevel3 and should not be changed.

Understanding the boot process is the key to having a detailed understanding of your ESX Server architecture.

11.6.1.3. Interaction between the Service Console, VMkernel, and Virtual Machines

The Service Console controls VM's virtual console mouse, keyboard, and screen (MKS) processes.

The Service Console manages the initialization and power state of VMs and access to the CD-ROM and floppy drives.

The Service Console manages all processes related to virtual machines (vmware-vmx).

The Service Console provides management functions for ESX Server, including HTTP and SNMP. It also offers authentication and a control API, which allows management of virtual machines and resource allocations.

The VMkernel creates a world for the virtual machine and assigns a world ID.

The VMkernel manages the virtualization layer for virtual machines and manages access to physical memory, the chipset, networks, and the hard disk.

The VMkernel is the ultimate authority on scheduling what runs and when.

Virtual machines depend on the Service Console and VMkernel for resources.