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1500 questions
90
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
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89
votes
4 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
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89
votes
6 answers

Standard place for user defined bash_completion.d scripts?

I have user access (no root) into a Linux (Suse) machine where I developed some bash scripts and the corresponding bash autocompletion rules. Since the scripts belong only to my user and therefore I need the complete rules only "active" for me (a…
Carles Sala
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89
votes
6 answers

Changing host permissions for MySQL users

I have the following grants for a user/database mysql> SHOW GRANTS FOR 'username'@'localhost'; +---------------------------------------------------------------------------+ | Grants for username@localhost …
f00860
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89
votes
4 answers

What is the literal escape character in Powershell?

When including a literal quote character inside a quoted string in Powershell, how do I escape the quote character to indicate it is a literal instead of a string delimeter?
David Alpert
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89
votes
3 answers

Curl: disable certificate verification

I am developing and I need to access https://localhost. I know the certificate will not match. I just want curl to ignore that. Currently it gives me the following error message: curl: (51) SSL peer certificate or SSH remote key was not OK Is it…
blueFast
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89
votes
4 answers

Vagrant / VirtualBox DNS 10.0.2.3 not working

I am running a fresh install of Linux Mint Nadia (14). I am following the instructions on Vagrant Getting Started but have gotten stuck on the Provisioning. It seems the Vagrant box cannot connect outside and so I can't install anything using either…
Rudolf Vavruch
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89
votes
10 answers

Testing UDP port connectivity

I am trying to test whether I can get to a particular port on a remote server (both of which I have access to) through UDP. Both servers are internet facing. I am using netcat to have a certain port listening. I then use nmap to check for that port…
Lock
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89
votes
4 answers

Why is TCP accept() performance so bad under Xen?

The rate at which my server can accept() new incoming TCP connections is really bad under Xen. The same test on bare metal hardware shows 3-5x speed ups. How come this is so bad under Xen? Can you tweak Xen to improve performance for new TCP…
cgbystrom
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89
votes
5 answers

Getting the last match in a file using grep

What's the best way of getting only the final match of a regular expression in a file using grep? Also, is it possible to begin grepping from the end of the file instead of the beginning and stop when it finds the first match?
Acorn
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88
votes
18 answers

Ansible stuck on gathering facts

I'm having some odd issues with my ansible box(vagrant). Everything worked yesterday and my playbook worked fine. Today, ansible hangs on "gathering facts"? Here is the verbose output: <5.xxx.xxx.xxx> ESTABLISH CONNECTION FOR USER:…
Bj Blazkowicz
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88
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
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88
votes
8 answers

Heartbleed: how to reliably and portably check the OpenSSL version?

I was looking at a reliable and portable way to check the OpenSSL version on GNU/Linux and other systems, so users can easily discover if they should upgrade their SSL because of the Heartbleed bug. I thought it would be easy, but I quickly ran into…
Martijn
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88
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
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88
votes
9 answers

Is there a proper way to clear logs?

I was wondering if there was a proper way to clear logs in general? I'm new to Ubuntu and I'm trying to set up Postfix. The log in question is /var/log/mail.log. I was wondering if there was a correct way to clear it, rather than me going in it and…
mastofact
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