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These are the questions we have identified as Canonical:

Capacity Planning

• Generic Capacity Planning: Can you help me with my capacity planning?
• How do you do load testing and capacity planning for databases?
• How do you do load testing and capacity planning for web sites?

Career

• Starting out: What a beginner should know/learn for sysadmin job?

Datacenter Design

• Fire Suppression: What's the best fire suppression for a server room?

Documentation

• Getting started with documentation

EMail & Spam

• Incoming:
  • Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?
• Bystander:
  • How to stop people from using my domain to send spam?
• Outgoing:
  • What are SPF records, and how do I configure them?
  • How to send emails and avoid them being classified as spam?

Hardware

• Why is Enterprise Storage so expensive?
• What are the different widely used RAID levels and when should I consider them?
• What is a Storage Area Network, and which benefits does it have over different storage solutions?

Hosting provider/server hardware shopping

• Dedicated server or Cloud Hosting?
• Use Google Apps/Cloud Services as a Domain Controller Replacement

Infrastructure Software

• What is Active Directory Domain Services and how does it work?
• Can I have multiple DHCP servers on one network?
• What is Group Policy and how does it work?
• What should the order of DNS servers be for an AD Domain Controller and Why?

DNS

- http://serverfault.com/q/125371
- http://serverfault.com/q/309622
- http://serverfault.com/q/74362
- http://serverfault.com/q/355887

Licensing

• Can you help me with my software licensing issue?

Networking

• Networking Units: Not getting expected performance from 100Mb Ethernet
• Hairpin NAT: Loopback to forwarded Public IP address from local network - Hairpin NAT
• What tool do you use to monitor your servers?
• What am I looking for in a Monitoring Solution?
• How does IPv4 Subnetting Work?
• How does IPv6 subnetting work and how does it differ from IPv4 subnetting?
• How do VLANs work?
• Exposing multiple servers behind NAT using a single public IP address

General Unix/Linux OS Stuff

• Why is Linux reporting "free" memory strangely?
• Why is my crontab not working, and how can I troubleshoot it?

Security

• How do I deal with a compromised server?
• Linux Webserver Rights: What permissions should my website files/folders have on a Linux webserver?
• Misbehaving users: What should I do about a "misbehaving" user?
• Restricted Shell: How to restrict the users' shell allowing to execute shell programs
• How to convince a big boss that he does not need administrator privileges?
• Tips for Securing a LAMP Server
• How do I deal with the removal/eradication of an unknown worm on our network?
• Why is "chmod -R 777 /" destructive?

SSH

• ProxyCommand: How to configure a shortcut for an SSH connection through a SSH tunnel

Terminal Server (RDS)

• Find out the bottleneck for windows remote desktop server (Terminal server)

Uptime

• 100% uptime for a web application
• reaching 99.9999% uptime

Unix (General)

• Unix Server Partitioning & Filesystem Layout

Virtualization

• Enabling hardware virtualisation BIOS; anything to beware?

Web Servers

• mod_rewrite: Everything you wanted to know about mod_rewrite rules but were afraid to ask
• Picking the right MPM (on *NIX systems): How do I select which Apache MPM to use?
• One-click (x)AMP: Why not use a WAMP stack?, Meta: What to do with XAMPP/MAMP/WAMP questions
• IIS7: What are the differences between Websites, Directories, Virual Directories, and Applications in IIS 7?
• SNI: Multiple SSL domains on the same IP address and same port?

Windows (General)