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1500 questions
189
votes
12 answers
Physically locating the server
I've got a CentOS server somewhere in the building; I can login into it remotely and VNC, etc. Now I've got to physically move it, and for that I need to physically locate the machine among the lookalikes around the office.
What can I do remotely to…
Michael
- 1,723
189
votes
32 answers
How do I prevent accidental rm -rf /*?
I just ran rm -rf /* accidentally, but I meant rm -rf ./* (notice the star after the slash).
alias rm='rm -i' and --preserve-root by default didn't save me, so are there any automatic safeguards for this?
I wasn't root and cancelled the command…
Valentin Nemcev
- 2,095
188
votes
4 answers
Find the location of a systemd unit file service
There are many different places where systemd unit files may be placed. Is there a quick and easy way to ask systemd where it read a service’s declaration from, given just the service name?
Joachim Breitner
- 4,399
187
votes
6 answers
187
votes
13 answers
Why couldn't MAC addresses be used instead of IPv4|6 for networking?
I am reading up on TCP/IP and other related protocols and technologies. MAC addresses are described as being (reasonably :) unique, and as having a large possibility space (several hundred trillions), while also being assigned to all network…
Félix Saparelli
- 1,403
- 2
- 11
- 10
186
votes
73 answers
What tool do you use to monitor your servers?
For a more comprehensive list of monitoring tools and their features, check out this Wikipedia page.
As the question states, what are the most commonly used tools used for this task and what are their strengths and weaknesses?
Aron Rotteveel
- 8,809
186
votes
12 answers
What does "Warning: untrusted X11 forwarding setup failed: xauth key data not generated" mean when ssh'ing with -X?
When I use ssh -X on my Mac (running OS X 10.6.7) to connect to my Ubuntu (11.04) box, I get the following warning:
Warning: untrusted X11 forwarding
setup failed: xauth key data not
generated Warning: No xauth data;
using fake authentication…
Daryl Spitzer
- 3,036
185
votes
16 answers
Why is DNS failover not recommended?
From reading, it seems like DNS failover is not recommended just because DNS wasn't designed for it. But if you have two webservers on different subnets hosting redundant content, what other methods are there to ensure that all traffic gets routed…
Lin
- 2,959
185
votes
2 answers
How do you answer yes for yum install automatically
In centos how do you answer yes automatically for yum install so that it is an unassisted install?
DiverseAndRemote.com
- 2,151
185
votes
7 answers
How can I read pcap files in a friendly format?
a simple cat on the pcap file looks terrible:
$cat tcp_dump.pcap
?ò????YVJ?
JJ
?@@.?E
Tony
- 4,393
185
votes
14 answers
How to create a UUID in bash?
In Java it is possible to create a random UUID:
UUID uuid = UUID.randomUUID();
How to do this in Bash?
raoulsson
- 4,923
184
votes
18 answers
Disk full, du tells different. How to further investigate?
I have a SCSI disk in a server (hardware Raid 1), 32G, ext3 filesytem. df tells me that the disk is 100% full. If I delete 1G this is correctly shown.
However, if I run a du -h -x / then du tells me that only 12G are used (I use -x because of some…
initall
- 2,415
184
votes
61 answers
Good tools that fit on a thumb drive
I have been on the lookout lately for some good tools to fill up my flash drive and I thought I would ask the Server Fault community for recommendations on good tools that will fit onto a thumb drive.
Some I use are Driver Packs, CCleaner and the…
Shard
- 1,432
183
votes
10 answers
How do I diff two text files in Windows Powershell?
I have two text files and want to find the differences between them using Windows Powershell. Is there something similar to the Unix diff tool available? Or is there another other way I haven't considered?
I've tried compare-object, but got this…
Brian Willis
- 4,019
183
votes
5 answers
Force dig to resolve without using cache
I'm wondering if there is a way to query a DNS server and bypass caching (with dig). Often I change a zone on the DNS server and I want to check if it resolves correctly from my workstation. But since the server caches resolved requests, I often get…
Daniel
- 3,347