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1500 questions
50
votes
5 answers

Can't connect to EC2 instance in VPC (Amazon AWS)

I've taken the following steps: Created a VPC (with a single public subnet) Added an EC2 instance to the VPC Allocated an elastic IP Associated the elastic IP with the instance Created a security group and assigned it to the instance Modified the…
Ryan Lynch
  • 603
50
votes
6 answers

Why does a hardware router perform better than a Linux router with better specs (RAM & CPU)?

I have a minimal CentOS 6.3, 64 bit acting as gateway with 4 NIC (1 Gbps), each bonded together one for public traffic and other for private, which performs NATing. It has 6 GB RAM and 4 logical cores. We have been using this for the past two years…
Blue Gene
  • 645
50
votes
3 answers

Add directory structure to SVN, without files

Is there a way to add a directory structure to an SVN repository without adding the files contained in the folders?
fresskoma
  • 1,343
50
votes
2 answers

Do some debian builds not have lsb_release?

A .deb package I am releasing expects that it can call lsb_release. One customer using Debian 6.0.5 indicated that the lsb_release command (even in the terminal) produces a command not found error. Is this standard or is there something wrong with…
UsAaR33
  • 1,206
50
votes
7 answers

How can I successfully mount an 8-bit SCSI drive on a modern computer?

I have a number of internal 8-bit SCSI-1 drives that I'd like to archive for historical purposes. These are all the old NeXT Cubes and NeXTStations (monochrome and color) that were used by id Software to create DOOM and Quake. I'd like to donate…
Don MacAskill
  • 1,818
50
votes
10 answers

Learning to compile things from source (on Unix/Linux/OSX)

While I install software from packages (MacPorts / apt-get) where-ever possible, I often find myself needing to compile packages from source. ./configure && make && sudo make install is usually enough, but sometimes it doesn't work - and when it…
Simon Willison
  • 665
50
votes
8 answers

How much of a performance hit for https vs http for apache?

Roughly how much of a performance hit will https take compared to http for the same page? Suppose I can handle 1000 requests/s for abc.php, how much will it decrease by when accessed through https? I know this might be dependent on hardware, config,…
erotsppa
  • 2,173
50
votes
3 answers

CNAME for top of domain?

Is it possible to set a CNAME record at the top of a domain? (i.e. @ CNAME www, @ CNAME foobar.com., etc.) My ISP says that it's only possible to use CNAME's for subdomains but I've read somewhere else that is should be possible even if not…
Martin
  • 795
50
votes
7 answers

System process (PID 4) constantly accessing the hard disk

Recently I noticed some of our machines are getting sluggish, mainly after boot-up. Using the Resource Monitor I detected excessive disk access from the system process with PID 4. Following some tips, I disabled the anti-virus on the System Volume…
zmbq
  • 665
50
votes
11 answers

Windows Task Scheduler does not start task at next run time

I have a Windows Server 2008 SP 2 Task Scheduler task that should run every 10 minutes. The trigger says "At 6:50 PM every day - After triggered, repeat every 10 minutes indefinitively." Looking at the Next Run Time, it says 6/18/2012 8:00 PM.…
Dan C
  • 641
50
votes
6 answers

tell yum to ignore a single dependency

I'm trying to install winswitch on CentOs 6. It requires nxagent. But in centos, the package name is nx. Is there a way to tell yum to skip checking the nxagent dependency (I installed nx already)? Specifying --skip-broken skips the whole thing.
IttayD
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  • 14
50
votes
6 answers

yum simulate install

Coming from an ubuntu perspective, if I want to check to see what additional packages will be installed/upgraded I can use apt-get --simulate install Is there something similar for yum? Our Red hat box (yum) is our production server,…
Michael
  • 811
50
votes
2 answers

Can someone please explain Windows Service Principle Names (SPNs) without oversimplifying?

I have wrestled with service principle names a few times now and the Microsoft explanation is just not sufficient. I am configuring an IIS application to work on our domain and it looks like some of my issues are related to my need to configure http…
Chris Magnuson
  • 3,891
50
votes
3 answers

How to forward port 80 to another port on the samemachine?

How can I forward requests coming in on port 80 to another port on the same linux machine? I used to do this by changing nat.conf, but this machine that I'm using doesn't have NAT. What's the alternative?
Nohsib
  • 601
50
votes
3 answers

How to use openssh sftp command with a RSA/DSA key specified from the command line

The Openssh ssh and scp command provied an -i command line option to specify the path to the RSA/DSA key to be used for authentication. Looking at the sftp man pages I was not able to find a way to specify the RSA/DSA key. I am looking for a way to…
Adi Roiban
  • 833
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