Clear RAM Memory Cache, Buffer and Swap Space on Linux Rumi, May 9, 2018July 14, 2020 Clear PageCache only # sync; echo 1 > /proc/sys/vm/drop_caches Clear dentries and inodes # sync; echo 2 > /proc/sys/vm/drop_caches Clear PageCache, dentries and inodes # sync; echo 3 > /proc/sys/vm/drop_caches Related Administrations Free MemoryRAM Clear
BIND ACL to restrict zone trasfer with IP address December 17, 2017 You need to define ACL in /etc/named.conf or /etc/bind/named.conf.local file. Let us say IP 1.2.3.4 and 1.2.3.5 are allowed to transfer your zones. # vi named.conf or vi /etc/bind/named.conf.local Here is sample entry for domain domain.org.bd (ns1 configuration): acl trusted-servers { 1.2.3.4; //ns1 1.2.3.5; //ns2 }; zone “domain.org.bd” { type… Read More
Dissection of SPF (Sender Policy Framework)- A way to configure your DNS server SPF parameters September 26, 2010 Pick a default. SPF domains have to publish at least two directives: a version identifier and a default mechanism. mydomain.com. TXT “v=spf1 -all” This is the simplest possible SPF record: it means your domain mydomain.com never sends mail. It makes sense to do this when a domain is only used… Read More
Reset lost root password on Ubuntu 18.04/20.x May 15, 2021 Boot Into GRUB menu The first step is to reboot into the GRUB menu. If Ubuntu 18.04 Bionic Beaver is the only operating system installed you need to keep pressing SHIFT for the GRUB menu to show up. Related Read More