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1500 questions
55
votes
7 answers

Headless Ubuntu server machine sometimes stuck at GRUB menu

I have Ubuntu 10.10 Server installed on a single-board machine in a semi-embedded environment; no keyboard or screen, just SSH access to it. So it's really frustrating when it occasionally boots up and gets stuck on the GRUB menu, waiting for a…
mikepurvis
  • 1,067
55
votes
4 answers

What does the "IN" mean in a zone file?

Sometimes a record is listed as www IN A 192.168.1.1 and sometimes it is listed as www A 192.168.1.1. What is the purpose of the IN and when is it required/not required?
Tabitha
  • 1,025
55
votes
9 answers

How to interrupt software raid resync?

I want to interrupt a running resync operation on a debian squeeze software raid. (This is the regular scheduled compare resync. The raid array is still clean in such a case. Do not confuse this with a rebuild after a disk failed and was…
Adam5
  • 551
55
votes
10 answers

RAID - software vs. hardware

I have always used hardware based RAID because it (IMHO) is on the right level (feel free to dispute this), and because OS failures are more common to me than hardware issues. Thus if the OS fails the RAID is gone and so is the data, whereas - on a…
Robert MacLean
  • 2,186
55
votes
5 answers

Ordering: 1. nginx 2. varnish 3. haproxy 4. webserver?

I've seen people recommend combining all of these in a flow, but they seem to have lots of overlapping features so I'd like to dig in to why you might want to pass through 3 different programs before hitting your actual web server. nginx: ssl:…
Joel K
  • 5,903
55
votes
4 answers

MySQL: creating a user that can connect from multiple hosts

I'm using MySQL and I need to create an account that can connect from either the localhost or from another server, i.e. 10.1.1.1. So I am doing: CREATE USER 'bob'@'localhost' IDENTIFIED BY 'password123'; CREATE USER 'bob'@'10.1.1.1' IDENTIFIED BY…
DrStalker
  • 7,036
55
votes
4 answers

Linux command line character limit

I'm passing a variable to a script on the command line. What is the character limit of a command? eg: $ MyScript reallyreallyreally...reallyreallyreallylongoption Thanks.
robdog
  • 653
55
votes
1 answer

What does the @ symbol mean in a file's permission settings?

I'm on MacOSX, I did ln -s on a directory and these are the results: -rwxrwxr-x@ 1 shiki admin 970332 Mar 6 16:38 apc.so -rwxrwxr-x@ 1 shiki admin 653884 Mar 6 16:38 eaccelerator.so -rw-rw-r--@ 1 shiki admin 60064 Mar 6 16:38…
Shiki
  • 760
55
votes
3 answers

Proxy HTTPS requests to a HTTP backend with NGINX

I have nginx configured to be my externally visible webserver which talks to a backend over HTTP. The scenario I want to achieve is: Client makes HTTP request to nginx which is redirect to the same URL but over HTTPS nginx proxies request over…
Mike
  • 885
55
votes
4 answers

how to restrict access to directory and subdirs

I need to restrict access to any files or subdirs in direstory "testdir". My conf: ... location ~* ^.+\.(jpg|txt)$ { root /var/www/site; } location /testdir { deny all; return 404; } ... In my…
tst
55
votes
6 answers

Debugger for Iptables

I'm looking for an easy way to follow a packet through the iptables rules. This is not so much about logging, because I don't want to log all traffic (and I only want to have LOG targets for very few rules). Something like Wireshark for Iptables. Or…
Chris Lercher
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54
votes
3 answers

loginctl enable-linger/disable-linger ... but reading linger-status?

I know how to enable/disable lingering with loginctl. But up to now I found no way to query the status of a user. I want to know: Is lingering enable for user foo? How can I access this information?
guettli
  • 3,833
54
votes
4 answers

What is the current state (2016) of SSDs in RAID?

There are plenty of resources available online that discuss using SSD drives in RAID configurations - however these mostly date back a few years, and the SSD ecosystem is very fast-moving - right as we're expecting Intel's "Optane" product release…
Dai
  • 2,299
54
votes
9 answers

How do I disable TLS 1.0 without breaking RDP?

Our credit card processor recently notified us that as of June 30, 2016 we will need to disable TLS 1.0 to remain PCI compliant. I tried to be proactive by disabling TLS 1.0 on our Windows Server 2008 R2 machine, only to find that immediately after…
Mike
  • 1,293
54
votes
3 answers

Is it valid for a hostname to start with a digit?

Is it valid for a hostname to start with a digit? e.g. 8server From reading RFC 1123 it would appear that this is a valid hostname. However, I'm not clear on whether a hostname can only start with a digit when there is a suffix e.g. 8server.com The…
Mark
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