All posts by expire0

By January 26, 2019

Cassandra is great for storing unknown type and amounts of data. One of the key benefits I like it. When you update a row and the primary matches. It will only update that row instead of adding a new row. With Mysql you had to set the unique option on the column. Git repo https://gitbox.apache.org/repos/asf?p=cassandra.git


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By December 29, 2018

Inside OpenKB’s lab.


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By May 01, 2018

Found some interesting commands to free up some virtual memory without a reboot. I did not think the command will work so i ran a test in the lab and sure enough. It works like a charm. just so you can see real time stats sync; echo 1 > /proc/sys/vm/drop_caches To clear inodes sync; echo


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By December 31, 2017

Debian Distro upgrade. For this example we are upgrading from jessie to stretch A) # apt-get update # apt-get upgrade # apt-get dist-upgrade sed -i ‘s/jessie/stretch/g’ /etc/apt/sources.list B) # apt-get update (if you receive a error similar to E: Release file expired. run apt-get -o Acquire::Check-Valid-Until=false update ) # apt-get upgrade # apt-get dist-upgrade C)


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By November 16, 2017

Block an IP iptables -I INPUT -s 43.229.53.37 -j DROP After rebooting the server we notice the rules are removed. It’s best to save your configs and restore them after a reboot. iptables-save > /etc/iptables/rules iptables-restore < /etc/iptables/rules flush all rules iptables -F flush rules in the input chain iptables -F INPUT iptables -L –line-numbers


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