Timekeeping best practices for Linux

On Linux VMs that require accurate time sync, changes are required in both the VMWare advanced configuration parameters :

Menu : Edit Settings, Options Tab, Advanced, Click "Configuration Parameters"

Add or change the following :

tools.TimeSync=TRUE

Link to VMWare Knowlegebase article concerning timekeeping in Linux on VMWare. This article breaks down the parameter settings by kernel and vendor.

http://tinyurl.com/vmware-linux-time

Accurate clock sync for VMs

For those VM guests that require accurate clock synchronization, specific changes must be made to the configuration of the VM. The following is a good starting point. We have deployed these changes on a number of VM guests in the test cluster and will be monitoring them to see how well this works......tom

Setting resource limits on VMs

In order to provide a more consistent level of service from the VMWare clusters, we would like to start setting resource limits for VMs as they are created. This prevents rogue VMs from consuming excessive resources to the detriment of other VMs in the cluster.

The following limits are proposed as defaults :

- 1 Ghz CPU

- 1Gb (1024 mb) RAM

These values can always be adjusted up as necessary.

--tom

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