====== Ubuntu - Networking - DNS - Flush DNS ======

===== View the statistics of our DNS cache =====

<code bash>
resolvectl statistics
</code>

returns:

<code bash>
DNSSEC supported by current servers: no

Transactions               
Current Transactions: 0    
  Total Transactions: 3554 
                           
Cache                      
  Current Cache Size: 0    
          Cache Hits: 13   
        Cache Misses: 84731
                           
DNSSEC Verdicts            
              Secure: 0    
            Insecure: 0    
               Bogus: 0    
       Indeterminate: 0    

</code>

----

===== Flush the cache =====

<code bash>
resolvectl flush-caches
</code>

<WRAP info>
**NOTE:** This should reduce the Cache Size entry reset to 0.

  * This works for both Ubuntu Server and Ubuntu Desktop.

</WRAP>

----

===== The Older Method =====

<code bash>
sudo systemd-resolve --flush-caches
</code>

----

Check the statistics in order to make sure that your cache size is now zero, thus cleared:

<code bash>
sudo systemd-resolve --statistics
</code>

returns:

<code bash>
DNSSEC supported by current servers: no

Transactions                
Current Transactions: 0     
  Total Transactions: 169902
                            
Cache                       
  Current Cache Size: 39    
          Cache Hits: 162   
        Cache Misses: 190   
                            
DNSSEC Verdicts             
              Secure: 0     
            Insecure: 0     
               Bogus: 0     
       Indeterminate: 0     
</code>

----