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1500 questions
92
votes
2 answers

Why do I need nginx when I have uWSGI

There are many tutorials on how to configure nginx to cooperate with uWGSI when I want to deploy Django application. But why do I need nginx in this kit? uWSGI itself can serve WSGI Python applications, it can serve static files, it can also do…
user983447
  • 1,187
92
votes
3 answers

Is a CNAME to CNAME chain allowed?

Is it allowed in DNS to have a CNAME record that points to another CNAME record? The reason we need this is that we have a hostname that we want to be looked up to the IP address of our web server computer. We also have another web server computer…
Erik Sjölund
  • 2,225
92
votes
4 answers

How can I find the path to an executable in OSX

Is there a command I can use to easily find the path to an executable? I'm looking for identify on my local machine - something like pwd? pwd identify => /usr/local/bin/identify
Codebeef
  • 1,519
91
votes
1 answer

How does "restart: always" policy work in docker-compose?

I have docker compose file with PostgreSQL and my application, like this: version: '3' services: postgresql: image: postgres:9.6.6 ports: - 9932:5432 expose: - "5432" environment: - POSTGRES_PASSWORD=pass …
Marcin Zablocki
  • 1,013
91
votes
2 answers

What’s the difference between the “mainline” and “stable” branches of nginx?

There seem to be two active branches of the nginx web server: a “mainline” branch (currently 1.9.x) and a “stable” branch (currently 1.8.x). Can anyone provide an official source that describes the difference between these two branches and how one…
bdesham
  • 1,905
91
votes
5 answers

What is the benefit of not allocating a terminal in ssh?

Every once in a while I will do something like ssh user@host sudo thing and I am reminded that ssh doesn't allocate a pseudo-tty by default. Why doesn't it? What benefits would I be losing if I aliased ssh to ssh -t?
Chas. Owens
  • 2,133
91
votes
5 answers

Nginx Redirect via Proxy, Rewrite and Preserve URL

In Nginx we have been trying to redirect a URL as follows: http://example.com/some/path -> http://192.168.1.24 where the user still sees the original URL in their browser. Once the user is redirected, say they click on the link to…
robjohncox
  • 1,065
91
votes
3 answers

Human readable format for http headers with tcpdump

I would like to view the HTTP headers sent from Apache (listening on port 80) to Tomcat (on port 4080) in a Linux machine. According to Wikipedia, Header fields are colon-separated name-value pairs in clear-text string format. I've tried some…
Adam Matan
  • 14,084
91
votes
9 answers

How can I list my open ports on Debian?

What is the command to display a list of open ports on a Debian server? I tried netstat -a | egrep 'Proto|LISTEN' but I would like something more specific that actually lists the port number.
leonel
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91
votes
10 answers

pg_dump and pg_restore: input file does not appear to be a valid archive

I have used pg_dump on one machine and copied result file to another, where I tried to restore it. I believe schema is the same. However, I get: pg_restore: [archiver] input file does not appear to be a valid archive I have done following…
gruszczy
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  • 7
91
votes
8 answers

What is "anycast" and how is it helpful?

I'd never heard of anycast until a few seconds ago when I read "What are some cool or useful server/networking tricks?". The wikipedia "Anycast" article on it is quite formal and doesn't really evoke a mental picture of how it would be used. Can…
username
  • 4,805
91
votes
17 answers

Should network hardware be set to "autonegotiate" speeds or fixed speeds?

We recently had a little problem with networking where multiple servers would intermittently lose network connectivity in a fairly painful-to-resolve way (required hard reboot). This has been going on for about two weeks, seemingly at random, on…
Jeff Atwood
  • 13,264
90
votes
3 answers

How does vm.overcommit_memory work?

When I use the default settings: vm.overcommit_memory = 0 vm.overcommit_ratio = 50 I can read these values from /proc/meminfo file: CommitLimit: 2609604 kB Committed_AS: 1579976 kB But when I change vm.overcommit_memory from 0 to 2, I'm…
Mikhail Morfikov
  • 1,086
90
votes
7 answers

Make a Docker application write to stdout

I'm deploying a 3rd-party application in compliance with the 12 factor advisory, and one of the points tell that application logs should be printed to stdout/stderr: then clustering software can collect it. However, the application can only write to…
kolypto
  • 11,588
90
votes
5 answers

Change default directory when I SSH to server

I was wondering if there is a way to change the default directory that I get put into after I SSH into my Ubuntu server. 99% of the time when I'm logging into my server, it is to access files within a specific directory: /var/www/websites Is there…
Bob Flemming
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