Highest Voted Questions - Server Fault Stack Exchange

197

votes

3 answers

Difference between KVM and QEMU

I have been reading about KVM and Qemu for sometime. As of now I have a clear understanding of what they do. KVM supports hardware virtualization to provide near native performance to the Guest Operating sytems. On the other hand QEmu emulates the…

virtualization kvm-virtualization qemu

asked Dec 03 '10 at 08:42

Abhishek Gupta

2,105
3
13
7

196

votes

9 answers

Check if array is empty in Bash

I have an array which gets filled with different error messages as my script runs. I need a way to check if it is empty of not at the end of the script and take a specific action if it is. I have already tried treating it like a normal VAR and using…

bash

asked Feb 11 '13 at 03:59

Marcos Sander

1,971
2
13
5

196

votes

6 answers

How to cd into a directory with this name "-2" (starting with the hyphen)?

I have a directory named: -2 I want to cd into it but the cd complains: bash: cd: -2: invalid option With no success, I've tried: cd "-2" cd '-2' cd \-2 Any solution? Edit: no file browsers like mc, etc. available on the server.

linux command-line-interface

asked Jan 03 '13 at 20:29

user151851

1,863
2
12
10

196

votes

22 answers

Is it normal to get hundreds of break-in attempts per day?

I just checked my server's /var/log/auth.log and found that I'm getting over 500 failed password/break-in attempt notifications per day! My site is small, and its URL is obscure. Is this normal? Should I be taking any measures?

linux security ssh firewall

asked Mar 08 '11 at 11:26

Kyle Cureau

1,537
3
11
15

195

votes

14 answers

How to view all ssl certificates in a bundle?

I have a certificate bundle .crt file. doing openssl x509 -in bundle.crt -text -noout only shows the root certificate. how do i see all the other certificates?

ubuntu security ssl ssl-certificate openssl

asked Apr 23 '14 at 18:15

pdeva

2,447
5
18
15

195

votes

5 answers

How to sleep in a batch file?

How to pause execution for a while in a Windows batch file between a command and the next one?

windows batch-file batch

asked Sep 26 '12 at 19:45

Massimo

70,200
57
200
323

195

votes

6 answers

LVM dangers and caveats

I have recently started using LVM on some servers for hard drives larger than 1 TB. They're useful, expandable and quite easy to install. However, I could not find any data about the dangers and caveats of LVM. What are the downsides of using LVM?

linux filesystems lvm data-integrity advanced-format

asked Jun 12 '11 at 07:34

Adam Matan

13,194
19
55
75

195

votes

1 answer

What is a challenge password?

I'm setting up SSL on an Ubuntu server. One of fields it asks for as part of setting up the CSR is a "challenge password". What is that? The default is blank. Do I need to enter one?

ssl csr

asked May 04 '11 at 14:34

Will Martin

2,431
5
19
18

195

votes

6 answers

VirtualBox: How to set up networking so both host and guest can access internet and talk to each other

I was wondering if someone could give me a simple guide on how to set up virtual networking in VirtualBox (4.0.2) so that the following scenarios work: Both Host and Guest can access the Internet Host can ping Guest and vice versa Host can access,…

networking virtualbox

asked Jan 21 '11 at 13:56

Svish

6,977
15
38
45

193

votes

3 answers

What does a + mean at the end of the permissions from ls -l?

What is the plus sign at the end of the permissions telling me? ls -l total 4 drwxrwxrwx+ 2 benson avahi-autoipd 4096 Jan 27 17:37 docs Here's the context: cat /etc/issue \CentOS release 5.3 (Final) Kernel \r on an \m

linux file-permissions

asked Jan 27 '11 at 22:44

bmargulies

2,333
3
17
20

193

votes

8 answers

How do you validate fstab without rebooting?

I modified /etc/fstab. I verified the new devices and I can mount them with the mount command. How may I validate the modifications made to /etc/fstab ?

fedora mount fstab

asked Aug 25 '10 at 02:51

Luc M

3,110
4
26
27

192

votes

15 answers

How to know from which yum repository a package has been installed?

After I have installed a package by yum (with multiple repositories configured), how can I find from which repository it has been installed? If I run yum info package-name (or yum list package-name), I can only see that the package is "installed".

linux yum package-management repository

asked Sep 03 '09 at 15:15

lg.

4,649
3
21
20

192

votes

6 answers

how to disable SSH login with password for some users?

On Linux (Debian Squeeze) I would like to disable SSH login using password to some users (selected group or all users except root). But I do not want to disable login using certificate for them. edit: thanks a lot for detailed answer! For some…

linux ssh password login

asked Jun 30 '11 at 14:31

Stepan

2,139
3
15
8

192

votes

11 answers

ssh-agent forwarding and sudo to another user

If I have a server A into which I can login with my ssh key and I have the ability to "sudo su - otheruser", I lose key forwarding, because the env variables are removed and the socket is only readable by my original user. Is there a way I can…

ssh sudo forwarding ssh-agent agent

asked Jan 28 '10 at 13:52

Florian Schulze

191

votes

10 answers

Nginx enable site command

We all know how to enable a website using apache on Linux. I'm pretty sure that we all agree on using the a2ensite command. Unfortunately, there is no default equivalent command that comes with Nginx, but it did happen that I installed some package…

nginx command-line-interface website command

asked Sep 05 '12 at 08:33

HXH

3,045
2
18
13

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