Top 25+ MCSE Interview Questions for System Admins
A collection of 25+ top MCSE interview questions with answers for System Admins.
MCSE (Microsoft Certified Solutions Expert) is a senior level certification from Microsoft....
Solaris OK prompt commands
What is OK Prompt?
Most of the time, when you start the server with Solaris OS installed, it boots at run level 2 or run...
The difference between fork(), vfork(), exec() and clone()
Fork:
The fork call basically makes a duplicate of the current process, identical in almost every way (not everything is copied over, for example, resource...
ELK Stack – Upgrade from 2.x to 5.x
Elasticsearch Snapshot and Restore
https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-snapshots.html
Elasticsearch Migration Helper Plugin
cd /usr/share/elasticsearch/
./bin/plugin install https://github.com/elastic/elasticsearch-migration/releases/download/v2.0.4/elasticsearch-migration-2.0.4.zip
you may get updated command from here -> Elasticsearch Migration Plugin Install
You may download plugin from...
App Store Optimization Checklist – ASO Tips
App Store Optimization is a way of ensuring your app meets app store ranking criteria and rises to the top of a search results...
Asterisk Server Security – SIP security
If your SIP server is exposed to internet. Then you need to take some measure even if you have fail2ban installed. Fail2Ban keep track...
netstat – Find number of active connections in Linux using netstat
The "netstat" command is quite useful for checking connections to your machine. If we wanted to see ALL of the connections (which i really...
DNS firewall – Its time to try DNS firewall
https://www.isc.org/wp-content/uploads/2017/12/RPZ-webinar7.ppt.pdf
https://www.isc.org/mission/webinars/
http://www.securityzones.net/images/downloads/Rackspace-RPZ-Case-Study.pdf
https://kb.isc.org/article/AA-00525/110/%20Building-DNS-Firewalls-with-Response-Policy-Zones-RPZ.html
http://www.securityzones.net/images/downloads/BIND_RPZ_Installation_Guide.pdf
Web Server Performance Tuning
First off, Apache, nginx, or LightSpeed aside - if you're running a server with 1000-2000 requests/second it's time to start thinking about dual servers...
top command on multi core processor
top command shows CPU usage as a percentage of a single CPU by default. That's why you can have percentages that are >100. On a...