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1500 questions
49
votes
3 answers
How to list all CNAME records for a given domain?
I cannot list them using dig/nslookup/host.
Paweł Gościcki
- 1,140
49
votes
5 answers
How can I tell which config file Apache is using?
I'm trying to set up virtual hosts on Mac OS X. I've been modifying httpd.conf and restarting the server, but haven't had any luck in getting it to work. Furthermore, I notice that it's not serving files in the DocumentRoot mentioned in httpd.conf…
Claudiu
- 1,227
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- 28
49
votes
5 answers
How do I check a PTR record?
I need to check a PTR record to make sure that a script I have is sending emails which will actually be received by my users and not be incorrectly marked as spam.
I understand that the ISP which owns the IP range has to set up the PTR record, but…
Daisetsu
- 667
49
votes
5 answers
Automatically answer defaults when doing 'make oldconfig' on a kernel tree
When building a new kernel based on a previous config, is there a way to automate the make oldconfig process so that it sets new options to their default values?
Edit: What I mean is that when using a .config (from /boot/config-* or /proc/config.gz)…
Jean-Francois Chevrette
- 753
- 2
- 6
- 8
48
votes
7 answers
Recursive text search with grep and file patterns
Given this example folder structure:
/folder1/file1.txt
/folder1/file2.djd
/folder2/file3.txt
/folder2/file2.fha
How do I do a recursive text search on all *.txt files with grep from "/"?
("grep -r *.txt" fails when run from "/", since…
Anders Sandvig
- 659
48
votes
11 answers
What is the difference between UDP and TCP?
My router has two protocols (and a "both" option) that I can select when setting up port forwarding: UDP and TCP. What is the difference between these two protocols and when would you select one over the other in port forwarding?
Guy
- 1,859
48
votes
3 answers
Can different AWS accounts manage different subdomains?
I have two AWS accounts. The master account with example.com as a Hosted Zone, this then has a number of record sets (i.e. api.example.com and kibana.example.com).
A second account will be managing testing.example.com as a Hosted Zone, with the…
mlk
- 591
48
votes
5 answers
How many requests should my webserver be able to handle?
Not going into specifics on the specs since I know there is no real answer for this. But I've been doing load testing today with the ab command in apache.
And got to the number of 70 requests per second (1000 requests with 100 concurrent users), on…
Ólafur Waage
- 686
48
votes
2 answers
Why was I able to delete a file owned by root in my home directory without being root?
So I was doing some maintenance on my server earlier today and noticed I was able to delete a file owned by root in my home directory.
I was able to reproduce a sample:
[cbennett@nova ~/temp]$ ls -al
total 8
drwxrwxr-x. 2 cbennett cbennett 4096 Oct…
Carl Bennett
- 803
48
votes
4 answers
How do I perform a file transfer using remote desktop on Windows 10?
I have been using remote desktop for a number years, on a number of versions of Windows, most recently 8.1.
Yesterday I upgraded to 10. I had to download Remote Desktop from the Windows Store. Easy enough. I managed to log into a few of my…
scopedial
- 583
48
votes
10 answers
Linux on VMware - why use partitioning?
When installing Linux VMs in a virtualized environment (ESXi in my case), are there any compelling reasons to partition the disks (when using ext4) rather than just adding separate disks for each mount point?
The only one I can see is that it makes…
savoche
- 553
48
votes
6 answers
ssh tunneling only access
Is it possible to configure ssh (on linux) to allow access for tunneling only? Ie user can setup tunnels but cannot get a shell/access files?
Second
- 713
48
votes
12 answers
Can't get SSH public key authentication to work
My server is running CentOS 5.3. I'm on a Mac running Leopard. I don't know which is responsible for this:
I can log on to my server just fine via password authentication. I've gone through all of the steps for setting up PKA (as described at…
Trey Parkman
48
votes
9 answers
Connecting to a remote server through a VPN when the local network subnet address conflicts with a remote network
This is a Canonical Question about solving IPv4 subnet conflicts between a VPN client's local network and one across the VPN link from it.
After connecting to a remote location via OpenVPN, clients try to access a server on a network that exists…
John Russell
- 583
48
votes
3 answers
What is the difference between IDRAC, IPMI and ILO?
I sometimes hear my colleagues talking about iDRAC, IPMI and iLO, when restarting a server. It seems that those terms are often misused.
For instance, is there a difference between saying that you connect to IPMI and iDRAC?
If I well-understand,…
Virtuose
- 617