This is something I did a while ago, but it came to my attention that people didn't; a) Know that it's recommended to use a syslog server with ESXi b) You could use an application built in to vMA called vilogger.

Although it is stated in The Architecture of VMware ESXi…..

Because the in-memory file system does not persist when the power is shut down, log files do not survive a reboot. ESXi has the ability to configure a remote syslog server, enabling you to save all log information on an external system. 

…..it is not a well known fact. So that is partly the reason for writing the post. The other reason is to introduce you to vilogger, which is part of the vMA. Of course you can use which ever syslog server you wish,  if you plan to use your own, be sure to checkout Managing VMware ESXi page #68 to view the configuration steps.

I'm not going to take you through the steps of installing vMA, nor am I going to tell you all about what the vMA (vSphere Manage Assistant) does. If you want to read more about that please find the relevant links in the Sources section at the bottom of the page. But I am going to take you through the steps I took to use vMA as my ESXi syslog server.

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Just a quick post about using ESXTOP with VMware ESXi. Obviously in ESXi there is no Service Console so we have to use the vMA (vSphere Management Assistant) to help us. If you haven't installed the vMA on your infrastructure yet, you can download it here: http://www.vmware.com/support/developer/vima/

Once install and configured, login and run the following command: resxtop –server <server name>

You will be prompted to login, use the root user/pass of the Host you want to run ESXTOP on (Note: Logging in as root will not work if the Host is in "Lockdown Mode".). You should then be presented with ESXTOP, I believe it has all of the same function as it did in the Service Console

Here you can see all avaliable options when connecting to a Host using RESXTOP

usage: resxtop [-h] [-v] [-b] [-s] [-a] [-c config file] [-d delay] [-n iterations]
               [--server server-name [--vihost host-name]] [--portnumber socket-port] [--username user-name]
              -h prints this help menu.
              -v prints version.
              -b enables batch mode.
              -s enables secure mode.
              -a show all statistics.
              -c sets the esxtop configuration file, which by default is .esxtop4rc
              -d sets the delay between updates in seconds.
              -n runs resxtop for only n iterations.
              --server      remote server name.
              --vihost      esx host name, if --server specifies vc server.
              --portnumber  socket port, default is 443.
              --username    user name on the remote server.
       for more information on interactive and batch modes
       please see man page for resxtop.