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1500 questions
66
votes
4 answers

git fetch specific revision from remote repository

We have a remote git repo that we normally deploy from using git push on our dev server then git pull on on our live servers to get the latest pushed version of the repo. But if we have committed and pushed a few revisions (without a git pull on the…
dlrust
  • 725
66
votes
8 answers

What steps do you take to secure a Debian server?

I am installing a Debian server which is connected directly to the Internet. Obviously I want to make it as secure as possible. I would like you guys/gals to add your ideas to secure it and what programs you use for it. I want part of this question…
Thomaschaaf
  • 3,122
65
votes
6 answers

Server wiped after "yum remove python"

A disaster just occurred to me after I ran the command yum remove python and now I can't boot the server up anymore. How it happened: I tried updating some apps via yum on my CentOS 5 VPS and the command was failing due to some weird python 2.4…
tadoman
  • 763
65
votes
4 answers

Download SSL certificate from aws certificate manager

I am using aws certificate manager for managing SSL. Recently I purchased a wildcard ssl *.example-private.com Now I need that SSL certificate to deploy on enterprise git instance on aws. How can i download ssl from aws?
Shailesh Sutar
  • 1,607
65
votes
1 answer

What does "Connection: close" mean when used in the response message?

When the client uses the Connection: close header in the request message, this means that it wants the server to close the connection after sending the response message. I thought that this header is only used in the request messages, but I have…
user365656
  • 653
65
votes
2 answers

Does memtest86+ test memory which is used to run itself?

One of the common server failure scenarios is bad DRAM, sometimes even when ECC memory is used. memtest86+ is one of the most useful tools to diagnose DRAM problems. As it loads itself at the start of the memory, I've been wondering if memtest86+…
Robin
  • 778
65
votes
4 answers

How to decide where to purchase a wildcard SSL certificate?

Recently I needed to purchase a wildcard SSL certificate (because I need to secure a number of subdomains), and when I first searched for where to buy one I was overwhelmed with the number of choices, marketing claims, and price range. I created a…
user664833
  • 1,287
65
votes
7 answers

What's the best way to see logged in users in Windows Server 2012?

Right now I use a powershell script to see the currently logged in users. But I don't see if their session is idle, active or inactive. I can see when the session was started, that's it. Is there an easy way to see how many users are currently…
RayofCommand
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65
votes
6 answers

Heartbleed: are services other than HTTPS affected?

The OpenSSL 'heartbleed' vulnerability (CVE-2014-0160) affects webservers serving HTTPS. Other services also use OpenSSL. Are these services also vulnerable to heartbleed-like data leakage? I'm thinking in particular of sshd secure SMTP, IMAP etc…
Flup
  • 8,398
65
votes
9 answers

Is it OK to set up passwordless `sudo` on a cloud server?

I love the idea of accessing servers via keys, so that I don't have to type in my password every time I ssh into a box, I even lock my user's (not root) password (passwd -l username) so it's impossible to log in without a key. But all of this…
Dmitry Pashkevich
  • 733
65
votes
10 answers

How do I get the MD5 of a file on Windows?

I need to check the MD5 of a few files on Windows. Any recommendations on either a command line or an explorer-plugin utility?
Daniel C. Sobral
  • 6,101
65
votes
12 answers

Loopback to forwarded Public IP address from local network - Hairpin NAT

This is a Canonical Question about Hairpin NAT (Loopback NAT). The generic form of this question is: We have a network with clients, a server, and a NAT Router. There is port forwarding on the router to the server so some of it's services are…
adopilot
  • 1,541
65
votes
19 answers

Does SpinRite do what it claims to do?

I don't have any real (i.e. professional) experience with Steve Gibson's SpinRite so I'd like to put this to the SF community. Does SpinRite actually do what it claims? Is it a good product to use? With a proper backup solution and RAID fault…
romandas
  • 3,432
65
votes
8 answers

dd on entire disk, but do not want empty portion

I have a disk, say /dev/sda. Here is fdisk -l: Disk /dev/sda: 64.0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size…
Jonathan Henson
  • 1,039
65
votes
7 answers

How to move files with SCP?

How to not copy but move files from one server to another (both Linux)? man scp didn't give me anything useful. I cannot use 'scp' then 'rm' because I must make sure the file is successfully transferred. If there is any error during transfer, the…
Putnik
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