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1500 questions
66
votes
19 answers

How do you document a network?

I'm not sure how to ask this question, since I'm not in the field. Say you're a network admin and you leave your job. How does the new guy know where to start?
Esteban Araya
  • 921
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
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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
  • 3,102
66
votes
7 answers

Choosing the shell that SSH uses?

How do I set the shell that is used when a user SSHs to a server. For example I can't stand BASH and need to use ZSH, how do I make it so ZSH is loaded along with my profile (.zsh_profile) when I ssh to the machine. I dont want to have to pass a…
JP Silvashy
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66
votes
7 answers

Government censors HTTPS traffic to our website. Workarounds?

I am helping run a website that has been blocked for political reasons by the same Russian agency that has previously tried blocking Telegram (RosKomNadzor). This is not the first time it happens, and previously we would just change the domain, but…
Mary
  • 613
65
votes
13 answers

The following signatures couldn't be verified because the public key is not available: NO_PUBKEY

My environment: # uname -a Linux app11 4.9.0-5-amd64 #1 SMP Debian 4.9.65-3+deb9u2 (2018-01-04) x86_64 GNU/Linux # # cat /etc/*release PRETTY_NAME="Debian GNU/Linux 9 (stretch)" NAME="Debian GNU/Linux" VERSION_ID="9" VERSION="9…
alexus
  • 13,374
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
6 answers

Display output with Ansible

I have a Ansible play for PGBouncer that displays some output from a stats module built into PGBouncer. My issue is that when Ansible prints the output to the terminal it mangles the newlines. Instead of seeing ---------- | OUTPUT | ---------- I…
mjallday
  • 922
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
  • 1,277
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
  • 8,118
65
votes
5 answers

What is the difference between a public and private subnet in a Amazon VPC?

When I launch a server with a security group that allows all traffic into my private subnet, it displays a warning that it may be open to the world. If it is a private subnet, how can that be?
Developr
  • 912
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
  • 3,362
65
votes
10 answers

Can I run a cron job more frequently than every minute?

Is it possible to run a cron job every 30 seconds without a sleep command?
user15336
  • 803
65
votes
5 answers

How to delete domain user profile from a computer?

I'm wondering how to safely remove a domain user profile from a computer that is a part of a domain. I don't want to delete the account from the domain itself, I just need to remove the profile from this computer, to do some cleanup. I'm currently…
Zlatko
  • 1,031
65
votes
6 answers

Why do ethernet cables have 8 wires?

This might seem a stupid question but why do Ethernet cables have 8 wires? Cat5 cables were just using 4 of the 8 wires, so only 4 are actualy 'needed'. Why not 12 or 16 wires?
ProgrammerAtWork
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