Windows – How to automate the DNS flush

azuredhcpdomain-name-systemwindows

I am having couple of Virtual machines . Few applications are using the HOSTNAME in their configuration files to contact these machines.

Everything was running fine and all happy! until application stopped connecting to VMs or services in VMs using hostname! After some R&D I found that we can still connect the VMs using IP!! That mean's it's DNS issue! So I run below three commands and all started working fine

ipconfig /flushdns
ipconfig /registerdns
netsh winsock reset

But now issue is, we can not predict when it will happen again. So what is best practise? Do I have to put these commands in a script and run in daily basis?

Best Answer

If you control the environment, you should consider to set higher values for the DHCP leases (e. g. 7 Days) and lower the TTL values on your DNS server (e. g. 15m or 1 hour).

In a well configured environment this behavior should not be observed.

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Windows – How to find what process is holding a file open in Windows

I've had success with Sysinternals Process Explorer. With this, you can search to find what process(es) have a file open, and you can use it to close the handle(s) if you want. Of course, it is safer to close the whole process. Exercise caution and judgement.

To find a specific file, use the menu option Find->Find Handle or DLL... Type in part of the path to the file. The list of processes will appear below.

If you prefer command line, Sysinternals suite includes command line tool Handle, that lists open handles.

Examples

c:\Program Files\SysinternalsSuite>handle.exe |findstr /i "e:\" (finds all files opened from drive e:\"
c:\Program Files\SysinternalsSuite>handle.exe |findstr /i "file-or-path-in-question"

Windows – What’s the command-line utility in Windows to do a reverse DNS look-up

ping -a w.x.y.z

Should resolve the name from the IP address if the reverse lookup zone has been set up properly. If the reverse lookup zone does not have an entry for the record, the -a will just ping without a name.

Best Answer

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Windows – How to find what process is holding a file open in Windows

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