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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
3 answers
why is loopback IP address from 127.0.0.1 to 127.255.255.254?
I do know that 127.0.0.1 ~ 127.255.255.254 are the loopback IP addresses for most modern operating systems and we could use these IP addresses to refer to our own computer. But isn't 127.0.0.1 enough?!?! why a wide range? why from 127.0.0.1 to…
kiana
48
votes
3 answers
ssh on windows - Corrupted MAC on input
I've installed OpenSSH on Windows.
I can successfully connect to my remote server via ssh with Putty from this Windows machine.
But when opening a PowerShell, and trying
ssh my_user@1.2.3.4
I've got the error:
debug3: send packet: type 5 …
Raoul Debaze
- 671
48
votes
3 answers
Change current directory to the batch file directory
I have a bat file on windows that execute a procdump operation. The issue with the batch file is that I need to cd to the batch file directory first before executing the job, or else the script won't work.
How to change to the current batch file…
Graviton
- 2,935
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
- 1,839
48
votes
3 answers
Can nginx location blocks match a URL query string?
Can nginx location blocks match a URL query string?
For example, what location block might match HTTP GET request
GET /git/sample-repository/info/refs?service=git-receive-pack HTTP/1.1
Derek Mahar
- 961
- 3
- 8
- 16
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
- 783
48
votes
5 answers
How do you use systemd's journalctl patterns
I am trying to use journalctl's pattern matching on SYSLOG_IDENTIFIERS. As an example, I have a ton of message tagged sshd:
$ journalctl -t sshd | wc -l
987
but if I try to use pattern matching to find them:
$ journalctl -t 'ssh*'
-- No Entries…
Mark Grimes
- 704
48
votes
5 answers
Is there a cloud-based reverse proxy solution in AWS?
The system
I have an API deployed on EC2 machines on AWS. Incoming HTTPS requests are passed to an elastic load balancer. The load balancer handles the SSL, and passes the request to an Nginx server, that proxies the requests to the specific…
Adam Matan
- 13,574
48
votes
2 answers
nginx split large configuration file
My nginx default configuration file is becoming huge. I'd like to split it to smaller config files, each including only one, maximum 4 locations to each file, so that I can enable/disable them quickly.
Actual file looks like this:
server {
…
oliverjkb
- 614
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
4 answers
How do I tell if grub is installed on a device?
How can I tell if grub is installed on a disk, and if it is what settings it has (noteably, what it has for the root parameter)
I need to check a lot of disks in software RAID1 arrays to make sure both disks have grub installed, with the grub on…
DrStalker
- 7,036
48
votes
3 answers
What does "Normal Shutdown, Thank you for playing [preauth]" In SSH logs mean?
Recently, My SSH log summaries for my Ubuntu 12.04 servers in Logwatch have started showing entries for "11: Normal Shutdown, Thank you for playing [preauth]" along with the "11: Bye Bye [preauth]" and "11: disconnected by user" messages they had…
Dave Stern
- 605
48
votes
1 answer
Can't start php-cgi.exe - MSVCR110.dll is missing
Trying to setup nginx and php on my Windows machine, but every time I try to start php-cgi.exe I get a system error.
The program can't start because MSVCR110.dll is missing from your
computer. Try reinstalling the problem to fix this…
Marwelln
- 599
- 1
- 5
- 5
48
votes
2 answers
How do I check what kernel options were compiled without looking at /boot/config-*
How do I check what options are compiled into a Linux kernel without looking at /boot/config-* and if I don't have access to the /boot/config-* file that's left over?
Amandasaurus
- 32,281
- 69
- 194
- 263