A caching only DNS server caches DNS query results for the domain name being queried. These chache are stored for pre specified time known as the TTL. A caching only name server will find the answer to name queries and remember the answer the next time you need it. This will shorten the waiting time […]
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How to Clear Memory cache in Linux !!!
Clearing the Linux Memory cache can be a quick way to regain system resources. Writing to the drop_cache process will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free. To free pagecache:# echo 1 > /proc/sys/vm/drop_caches To free dentries and inodes:# echo 2 > /proc/sys/vm/drop_caches […]
See MoreAllow certain IP’s for services in CSF
Add the following line in your /etc/csf/csf.allow tcp|in|d=21|s=192.168.x.x tcp|out|d=21|d=192.168.x.x Restart csf with : csf -r This will allow incoming/outgoing connections to port 21
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