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1500 questions
110
votes
3 answers

What is .crt and .key files and how to generate them?

I've the following configuration: SSLEngine on SSLCertificateFile /etc/httpd/conf/login.domain.com.crt SSLCertificateKeyFile /etc/httpd/conf/login.domain.com.key SSLCipherSuite ALL:-ADH:+HIGH:+MEDIUM:-LOW:-SSLv2:-EXP but I don't know how to…
Mohammad Ali Akbari
  • 1,833
110
votes
6 answers

Is X.Y.Z.0 a valid IP address?

Are IP addresses with a 0 in the last octet valid? 10.6.43.0 In my case, I have the the following netmask 255.255.252.0 What about a 0 for the other octets?
Alan H
  • 2,332
110
votes
5 answers

Multiple SSL domains on the same IP address and same port?

This is a Canonical Question about Hosting multiple SSL websites on the same IP. I was under the impression that each SSL Certificate required it's own unique IP Address/Port combination. But the answer to a previous question I posted is at odds…
learningtech
  • 7,769
109
votes
8 answers

How can I edit the welcome message when ssh start?

I have a VPS for my website hosting. It is running a Ubuntu server. Every time I logged in my server by ssh, it displays a lengthy welcome message in my terminal. Linux node61.buyvm.net 2.6.18-pony6-3 #1 SMP Tue Mar 13 07:31:44 PDT 2012…
Yansuck
109
votes
7 answers

How to retrieve the last modification date of all files in a Git repository

I know how to retrieve the last modification date of a single file in a Git repository: git log -1 --format="%ad" -- path/to/file Is there a simple and efficient way to do the same for all the files currently present in the repository?
user65570
109
votes
7 answers

SSH from A through B to C, using private key on B

I'm looking for a simple way to SSH from my local machine, A, through a proxy, B, to a destination host, C. The private key that goes with the public key on C is on B, and I can't put that key on my local machine. Any tips? Also, I'd like to be…
wrangler
  • 3,300
109
votes
8 answers

How do I set the global PATH environment variable on OS X?

I'd like to append to the global PATH environment variable on OS X so that all user shells and GUI applications get the same PATH environment. I know I can append to the path in shell startup scripts, but those settings are not inherited by GUI…
lajos
  • 1,355
108
votes
4 answers

How to make Windows 7 USB flash install media from Linux?

I have: ISO image of Windows 7 install media 4 GB USB flash drive no DVD drive Linux installed
Ian Kelling
  • 2,719
108
votes
2 answers

Differences and dis/advanages between: Fast-CGI, CGI, Mod-PHP, SuPHP, PHP-FPM

There are few different php "wrappers"(?). What are differences between them? Tried to google some, but cant seem to find informations. (mod-php is not googleable). Why might I choose one over another?
Gacek
  • 1,241
108
votes
3 answers

Can Mac OS X be run inside Docker?

Can Mac OS X be run inside Docker? If so, any suggestion as to how? And would it be running headless, or there would be a possibility to connect to the GUI remotely?
simone
  • 1,291
108
votes
3 answers

How do high traffic sites service more than 65535 TCP connections?

If there is a limit on the number of ports one machine can have and a socket can only bind to an unused port number, how do servers experiencing extremely high amounts (more than the max port number) of requests handle this? Is it just done by…
alh
  • 1,219
108
votes
5 answers

SSH keypair generation: RSA or DSA?

SSH supports two signature algorithms for key pairs: RSA and DSA. Which is preferred, if any? For RSA, what is the minimum acceptable key length?
Brad Ackerman
  • 2,251
108
votes
6 answers

High load average, low CPU usage - why?

We're seeing huge performance problems on a web application and we're trying to find the bottleneck. I am not a sysadmin so there is some stuff I don't quite get. Some basic investigation shows the CPU to be idle, lots of memory to be available,…
Spiff
  • 1,711
108
votes
2 answers

I have a keypair. How do I determine the key length?

Using OpenSSL from the command line in Linux, is there some way to examine a key (either public or private) to determine the key size?
jdw
  • 3,955
108
votes
6 answers

"POSSIBLE BREAK-IN ATTEMPT!" in /var/log/secure — what does this mean?

I've got a CentOS 5.x box running on a VPS platform. My VPS host misinterpreted a support inquiry I had about connectivity and effectively flushed some iptables rules. This resulted in ssh listening on the standard port and acknowledging port…
Mike B
  • 12,304
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