UNIX related tutorial/FAQ

How to create FreeNAS Jails with iocage

May 21, 2018May 27, 2018in FreeBSD, FreeBSD Jails (VPS), FreeNAS, UNIX last updated May 27, 2018

How do I install and use a FreeBSD jail manage called iocage on FreeNAS server from the command line? How do I create FreeNAS jail with iocage command?

What does rm -rf command do on a Linux or Unix

May 21, 2018May 21, 2018in Commands, FreeBSD, Linux, Mac OS X, UNIX last updated May 21, 2018

I am a new Linux sysadmin. What is the purpose of rm -rf command on a Linux? What does rm -rf command do on a Unix-like operating system?

How to backup FreeNAS configuration file and restore it

May 13, 2018May 13, 2018in Backup & Recovery, FreeBSD, FreeNAS, UNIX last updated May 13, 2018

I have FreeNAS server configured to backup data for my office. How do I backup FreeNAS configuration file?

Curl Set User Agent Command on Linux or Unix

May 8, 2018in Linux, UNIX last updated May 8, 2018

I need to set the user agent header for curl command. How can I set or change user agent with curl command on Linux or Unix like system?

How to redirect Nginx non-www to www domain over SSL

April 24, 2018in Linux, Nginx, Troubleshooting, UNIX last updated April 24, 2018

I am getting an error that reads, “Your connection is not secure” when trying to redirect https://theos.in/ to https://www.theos.in/ domain using HTTP 301. How do I redirect Nginx non-www to www domain over SSL?

How to patch Meltdown and Spectre vulnerabilities on FreeBSD

April 20, 2018in FreeBSD, UNIX last updated April 20, 2018

All supported versions of FreeBSD affected by Meltdown (CVE-2017-5754), Spectre variant 1 (CVE-2017-5753), and Spectre variant 2 (CVE-2017-5715). How do I patch Meltdown and Spectre vulnerabilities on FreeBSD (speculative execution vulnerabilities) server powered by 64 bit Intel CPU?

Secure memcached server to avoid DDoS amplification attacks

March 5, 2018March 5, 2018in Linux, Security, UNIX last updated March 5, 2018

I am worried that my Memcached server used for DDoS amplification attacks. How do I secure Memcached server on Linux or Unix-like system to avoid an attacker to exploit my Memcached services as an amplification vector, causing unexpected volumes of traffic to be sent to targeted networks?
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