Tag Archives: SSH

VCSA6 Bash and SSH Key Authentication

The Linux Version of the vCenter Server is not new anymore but with vSphere 6.0 the vCenter Server Appliance (VCSA) has overtaken the Windows Version in many aspects. The completely rewritten linked mode removes the need for a Windows-based vCenter and the scalability of both appliances are identical.

VCSA6 is delivered as appliance based on openSUSE. Nevertheless its a Linux, VMware want's you to use the GUI. Unless you are in a testing environment I would highly recommend to limit shell usage to the following usage scenarios:

  • During Service Requests under advice of VMware GSS
  • For advanced troubleshooting
  • When required for complex deployments (eg. PSC 6.0 High Availability)

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ESXi 5 Network Troubleshooting Commands

Check if a remote host is online and reachable.

~ # ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: icmp_seq=0 ttl=58 time=13.701 ms
64 bytes from 8.8.8.8: icmp_seq=1 ttl=58 time=10.176 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=58 time=9.055 ms

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 9.055/10.977/13.701 ms

Ping from a specific VMkernel adapter.

~ # ping -I vmk1 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: icmp_seq=0 ttl=58 time=9.991 ms
64 bytes from 8.8.8.8: icmp_seq=1 ttl=58 time=9.270 ms

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Identify Virtual Machine Locks & Find ESXi Hosts by its MAC Address

I recently had an issues where a virtual machine crashed. VM Monitoring (VM HA) tried to restart it, but did not succeed. The virtual machine was greyed out in the inventory and could not be started because it was locked. Unfortunately, it was not possible to identify which ESXi host holds the lock. This post explains how to quickly identify which server is blocking the Virtual Machine.

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