MCSE Top Interview Q&A

Top 25+ MCSE Interview Questions for System Admins

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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

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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()

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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

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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

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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

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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

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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

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  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

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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

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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...