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1500 questions
66
votes
7 answers

What are the drawbacks of running a database inside a virtual machine? How do I overcome them?

Running anything inside a virtual machine will have some level of performance hit, but how much does it really impact the performance of a database system? I found this academic reference paper with some interesting benchmarks, but it was a limited…
Russ
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66
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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
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66
votes
4 answers

Check OpenSSH version and update instructions on FreeBSD system

On a FreeBSD system (8.1), I am looking for instructions on how to check the running version of OpenSSH and also instructions on the best way to download install an update of OpenSSH
ICTdesk.net
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66
votes
2 answers

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
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66
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1 answer

Linux FHS: /srv vs /var ... where do I put stuff?

My web development experience has started with Fedora and RHEL but I'm transitioning to Ubuntu. In Fedora/RHEL, the default seems to be using the /var folder while Ubuntu uses /srv. Is there any reason to use one over the other and where does the…
wag2639
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66
votes
19 answers

How do you document a network?

I'm not sure how to ask this question, since I'm not in the field. Say you're a network admin and you leave your job. How does the new guy know where to start?
Esteban Araya
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66
votes
4 answers

git fetch specific revision from remote repository

We have a remote git repo that we normally deploy from using git push on our dev server then git pull on on our live servers to get the latest pushed version of the repo. But if we have committed and pushed a few revisions (without a git pull on the…
dlrust
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66
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8 answers

What steps do you take to secure a Debian server?

I am installing a Debian server which is connected directly to the Internet. Obviously I want to make it as secure as possible. I would like you guys/gals to add your ideas to secure it and what programs you use for it. I want part of this question…
Thomaschaaf
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65
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2 answers

Does memtest86+ test memory which is used to run itself?

One of the common server failure scenarios is bad DRAM, sometimes even when ECC memory is used. memtest86+ is one of the most useful tools to diagnose DRAM problems. As it loads itself at the start of the memory, I've been wondering if memtest86+…
Robin
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65
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5 answers

How do I tell when/if/why a container in a kubernetes cluster restarts?

I have a single node kubernetes cluster in google container engine to play around with. Twice now, a small personal website I host in it has gone offline for a couple minutes. When I view the logs of the container, I see the normal startup sequence…
Marc Hughes
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65
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4 answers

How to decide where to purchase a wildcard SSL certificate?

Recently I needed to purchase a wildcard SSL certificate (because I need to secure a number of subdomains), and when I first searched for where to buy one I was overwhelmed with the number of choices, marketing claims, and price range. I created a…
user664833
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65
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6 answers

Heartbleed: are services other than HTTPS affected?

The OpenSSL 'heartbleed' vulnerability (CVE-2014-0160) affects webservers serving HTTPS. Other services also use OpenSSL. Are these services also vulnerable to heartbleed-like data leakage? I'm thinking in particular of sshd secure SMTP, IMAP etc…
Flup
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65
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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
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65
votes
19 answers

Does SpinRite do what it claims to do?

I don't have any real (i.e. professional) experience with Steve Gibson's SpinRite so I'd like to put this to the SF community. Does SpinRite actually do what it claims? Is it a good product to use? With a proper backup solution and RAID fault…
romandas
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65
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12 answers

MySQL keeps crashing: InnoDB: Unable to lock ./ibdata1, error: 11

I have a simple webserver (Debian 6.0 x86, DirectAdmin with 1 GB of memory and still 10 GB free space, mySQl version 5.5.9), however the mySQL server keeps crashing and I need to kill all mySQL processes to be able to restart it…
Devator
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