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1500 questions
326
votes
4 answers
What are the functional differences between .profile .bash_profile and .bashrc
What are the functional differences between the .profile, .bash_profile and .bashrc files?
lollercoaster
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- 5
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321
votes
5 answers
How to send ctrl+alt+del using Remote Desktop?
How can I send ctrl+alt+del to a remote computer over Remote Desktop?
For example, if I wanted to change the local admin password on a remote PC using a Remote Desktop connection, it would be helpful to be able to send the ctrl+alt+del key sequence…
T. Marshall
- 3,313
- 2
- 16
- 8
321
votes
6 answers
How to set environment variable in systemd service?
I have an Arch Linux system with systemd and I've created my own service. The configuration service at /etc/systemd/system/myservice.service looks like this:
[Unit]
Description=My…
lfagundes
- 3,313
- 2
- 13
- 6
319
votes
27 answers
100% uptime for a web application
We received an interesting "requirement" from a client today.
They want 100% uptime with off-site failover on a web application. From our web application's viewpoint, this isn't an issue. It was designed to be able to scale out across multiple…
NotMe
- 3,772
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319
votes
24 answers
Can I automatically add a new host to known_hosts?
Here's my situation: I'm setting up a test harness that will, from a central client, launch a number of virtual machine instances and then execute commands on them via ssh. The virtual machines will have previously unused hostnames and IP…
gareth_bowles
- 8,867
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305
votes
8 answers
How to bind MySQL server to more than one IP address?
Is there a secret way to bind MySQL to more than one IP address?
As far as I can see the bind-address parameter in the my.cnf does not support more than one IP and you can't have it more than once.
BlaM
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- 26
- 27
299
votes
14 answers
What's the command-line utility in Windows to do a reverse DNS look-up?
Is there a built-in command line tool that will do reverse DNS look-ups in Windows? I.e., something like w.x.y.z => mycomputername
I've tried:
nslookup: seems to be forward look-up only.
host: doesn't exist
dig: also doesn't exist.
I…
alastairs
- 3,125
- 3
- 18
- 11
292
votes
4 answers
How do I select which Apache MPM to use?
This is a Canonical Question about selecting the right Apache httpd MPM.
I'm a little confused between the different MPMs offered by Apache - 'worker', 'event', 'prefork', etc.
What are the major differences between them, and how can I decide…
Tiffany Walker
- 6,541
- 13
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- 77
282
votes
5 answers
Nginx reverse proxy + URL rewrite
Nginx is running on port 80, and I'm using it to reverse proxy URLs with path /foo to port 3200 this way:
location /foo {
proxy_pass http://localhost:3200;
proxy_redirect off;
proxy_set_header …
jeffreyveon
- 2,985
- 3
- 14
- 7
281
votes
160 answers
Useful Command-line Commands on Windows
The aim for this Wiki is to promote using a command to open up commonly used applications without having to go through many mouse clicks - thus saving time on monitoring and troubleshooting Windows machines.
Answer entries need to…
dance2die
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281
votes
4 answers
Why do I need Nginx and something like Gunicorn?
I'm looking for an overly simplified answer to the following question. I'm trying to build a foundational understanding of how Nginx works alongside something like Gunicorn.
Do I need both Nginx and something like Gunicorn to deploy Django apps on…
a.m.
- 2,915
- 3
- 13
- 6
281
votes
13 answers
Can I nohup/screen an already-started process?
I'm doing some test-runs of long-running data migration scripts, over SSH. Let's say I start running a script around 4 PM; now, 6 PM rolls around, and I'm cursing myself for not doing this all in screen.
Is there any way to "retroactively" nohup a…
ojrac
- 2,913
- 3
- 17
- 5
281
votes
5 answers
Redirect, Change URLs or Redirect HTTP to HTTPS in Apache - Everything You Ever Wanted to Know About mod_rewrite Rules but Were Afraid to Ask
This is a Canonical Question about Apache's mod_rewrite.
Changing a request URL or redirecting users to a different URL than the one they originally requested is done using mod_rewrite. This includes such things as:
Changing HTTP to HTTPS (or the…
Kyle Brandt
- 82,107
- 71
- 302
- 444
278
votes
45 answers
What are the obstacles to providing reliable Internet access and Wi-Fi at large tech conferences?
Every tech conference I've ever been to, and I've been to a lot, has had absolutely abysmal Wi-Fi and Internet access.
Sometimes it's the DHCP server running out of addresses. Sometimes the backhaul is clearly inadequate. Sometimes there's one…
Joel Spolsky
- 3,686
- 4
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- 19
278
votes
7 answers
Check if port is open or closed on a Linux server?
How can I check if a port is listening on a Linux server?
James Anderson
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