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1500 questions
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2 answers

Why does AWS recommend against public S3 buckets?

"We highly recommend that you never grant any kind of public access to your S3 bucket." I have set a very granular public policy (s3:GetObject) for one bucket that I use to host a website. Route53 explicitly supports aliasing a bucket for this…
Andrew Johnson
  • 791
68
votes
4 answers

best way to debug nginx rewrite rules in config file?

I have a bunch of rewrite rules that I have to port from apache to nginx. It's a rather painful process because I'm not able to see if my rewrite rules and "if" conditions are working as I want them to. Apache did have debugging for its rewrite…
Jiho Kang
  • 1,087
68
votes
11 answers

Disable a service from starting at all runlevels?

I have a service foo which currently starts at runlevel 3 and above. How can I stop it from doing so, without using update-rc.d foo stop 3 ., which (if I understand it correctly) would turn off the service at each runlevel change. (ie., if I was at…
lfaraone
  • 1,621
68
votes
9 answers

How do I determine the block size of an ext3 partition on Linux?

How do I determine the block size of an ext3 partition on Linux?
mike
  • 4,013
68
votes
1 answer

Bash: Difference between > and >> operator?

I don't know much about bash. My instructor asked me to make a cat script and to observe the output and then tell what is the operator > and what is the difference between the operators > & >>. I am unable to find any justifications. Could you…
jumbo18
  • 697
68
votes
2 answers

GNU less: How can I search while ignoring case sensitivity without using less -I option?

From GNU less manpage -i or --ignore-case Causes searches to ignore case; that is, uppercase and lowercase are considered identical. This option is ignored if any uppercase letters appear in the search pattern; in other words, if a pattern contains…
Tom Feiner
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68
votes
2 answers

What does "Error: Cycle". means in Terraform?

The Terraform docs for some weird reason do not explain what "Error: Cycle" means. I've looked everywhere but there is no mention of it on the official docs. (Turns out it is well-known term, a circular dependency, that someone apparently renamed…
Juan Jimenez
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67
votes
9 answers

What a beginner should know/learn for sysadmin job?

This is a Canonical Question about System Administration Careers When I start my job as System Administrator, what basics skills should I know/learn? Are there any key differences for Network, Storage, Database, and other Administrators?
Dhanapal
  • 905
67
votes
3 answers

Rsync triggered Linux OOM killer on a single 50 GB file

I have a single 50 GB file on server_A, and I'm copying it to server_B. I run server_A$ rsync --partial --progress --inplace --append-verify 50GB_file root@server_B:50GB_file Server_B has 32 GB of RAM with 2 GB swap. It is mostly idle and should…
dataless
  • 833
67
votes
4 answers

What is the difference between syslog, rsyslog and syslog-ng?

I am a bit confused in syslog, rsyslog and syslog-ng. From where can I get the source code for syslog()? Is there any difference between rsyslog and rsyslogd?
StackUser
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67
votes
3 answers

Is a VM with 2 CPUs really faster than one with 4 CPUs?

Our IT created a VM with 2 CPUs allocated rather than the 4 I requested. Their reason is that the VM performs better with 2 CPUs rather than 4 (according to them). The rationale is that the VM hypervisor (VMWare in this case) waits for all the…
AngryHacker
  • 2,897
67
votes
2 answers

Nginx location regex doesn't work with proxy pass

I'm trying to get these 2 location directives working in Nginx but I'm getting some errors back when booting Nginx. location ~ ^/smx/(test|production) { proxy_pass http://localhost:8181/cxf; } location ~ ^/es/(test|production)…
Niels
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67
votes
13 answers

104: Connection reset by peer while reading response header from upstream (Nginx)

I have a server which was working ok until 3rd Oct 2013 at 10:50am when it began to intermittently return "502 Bad Gateway" errors to the client. Approximately 4 out of 5 browser requests succeed but about 1 in 5 fail with a 502. The nginx error log…
Nigel Alderton
  • 1,012
67
votes
3 answers

How to read memory usage in htop?

Here is my htop output: For example, I'm confused by this ruby script: How much physical memory is it using? 3+1+8+51+51? 51? 51+51?
Lai Yu-Hsuan
  • 833
67
votes
10 answers

Unique Features of bash compared to zsh

I have been a zsh user for quite some time (before that tcsh and before that csh). I am quite happy with it, but was wondering if there are any compelling features of bash that do not exist in zsh. And conversely, are there zsh features which do not…
Tim
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