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1500 questions
61
votes
4 answers

linux/setfacl - Set all current/future files/directories in parent directory to 775 with specified owner/group

I have a directory called "members" and under it there are folders/files. How can I recursively set all the current folders/files and any future ones created there to by default have 775 permissions and belong to owner/group nobody/admin…
Maverick
  • 1,631
61
votes
8 answers

dd on entire disk, but do not want empty portion

I have a disk, say /dev/sda. Here is fdisk -l: Disk /dev/sda: 64.0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size…
Jonathan Henson
  • 999
61
votes
9 answers

How do you recover you RDS master user username?

Resetting the RDS master user's password is simple enough, but how do you find your master users username?
mkirk
  • 733
61
votes
4 answers

Fastest way to extract tar.gz

Is there anyway to extract a tar.gz file faster than tar -zxvf filenamehere? We have large files, and trying to optimize the operation.
Justin
  • 5,438
61
votes
8 answers

Why would I need a firewall if my server is well configured?

I admin a handful of cloud-based (VPS) servers for the company I work for. The servers are minimal ubuntu installs that run bits of LAMP stacks / inbound data collection (rsync). The data is large but not personal, financial or anything like that…
Aitch
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61
votes
4 answers

How to use nginx to proxy to a host requiring authentication?

How can I setup an nginx proxy_pass directive that will also include HTTP Basic authentication information sent to the proxy host? This is an example of the URL I need to proxy to: http://username:password@192.168.0.5/export?uuid=1234567890 The…
bwizzy
  • 1,295
61
votes
10 answers

How can I find the biggest directories in Unix / Ubuntu?

Is there a way in Unix to see the biggest directories on disk? I need to know why I'm almost out of space on the server,= and I don't know where most of the space is used.
aneuryzm
  • 1,754
61
votes
6 answers

How can I run mongod in the background on unix (mac osx)?

I would like to run mongod in the background as an always present sort of thing. What would be the best way to do this? Kind of like the way I can run MySQL on startup and it's just always there running in the background. Maybe it's just some bash…
rmontgomery429
  • 759
61
votes
12 answers

Is virtual machine slower than the underlying physical machine?

This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any virtualization. How much (1%, 5%, 10%)? Did anyone…
Michal Illich
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  • 5
61
votes
3 answers

Mount Remote CIFS/SMB Share as a Folder not a Drive Letter

Is there any way to mount a remote CIFS/SMB/SAMBA share as a folder/directory and not as a drive letter. For example, I want this map: \\Server\ShareName -> C:\Folder\ShareName Instead of the usual map like this: \\Server\ShareName -> Z:\ The…
Anagoge
  • 713
60
votes
1 answer

What is the difference between a 'Login' and an 'Interactive' bash shell

What is the difference between a ‘Login’ and an ‘Interactive’ bash shell? I have quoted Wikipedia below but can anybody give a better answer? EDIT: This is a community wiki so maybe rather than voting to close you could provide examples of which…
Gareth
  • 8,573
60
votes
3 answers

iptables -L pretty slow. Is this normal?

Quick question but Gooling has not revealed an answer. When I do iptables -L, it seems to lag on displaying items in where I have limited the source to internal ips 192.168.0.0/24 The whole listing takes about 30 seconds to display. I just want to…
Bartek
  • 809
60
votes
5 answers

How to give username/password to git clone in a script, but not store credentials in .git/config

I am cloning a git repository in a script like this: git clone https://user:password@host.com/name/.git This works, but my username and my password! are now stored in the origin url in .git/config. How can I prevent this, but still do this in a…
Nathan
  • 733
60
votes
6 answers

"reboot" or "shutdown -r now": what restart command is safer?

We have in our organization around ~500 RedHat Linux machines. On all the machines we installed applications and services under /etc/init.d, and oracle RAC servers. We intend to perform yum updates on all machines and after that take a reboot. So I…
dandan
  • 1,081
60
votes
14 answers

64-bit TortoiseSVN on Windows 7 says "file or directory is corrupted and unreadable" then runs chkdsk

I'm using 64-bit TortoiseSVN on a 64-bit Windows 7 Professional. Every so often a checkout or update will fail with an error message like the following. Error: Can't move Error: '[...]\\.svn\tmp\entries' Error: to Error: '[...]\\.svn\entries':…
David Alpert
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