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1500 questions
128
votes
4 answers

All servers flooded by salt water, is it possible to recover data from multi-platter drives?

All of my servers are currently flooded by salt water. Is it possible for each platter in a multi-platter drive to be separated, cleaned, imaged, and merged into a new virtual drive for data recovery?
michael
128
votes
15 answers

Mount CIFS Host is down

I have an issue with a mount point that was previously configured. It shows the folder, but the mount is missing and holds "?" values for size, permissions, etc. So I tried to remount using cifs and the same command from before: mount -t cifs…
Kevin
  • 1,413
128
votes
4 answers

How to check if a port is blocked on a Windows machine?

On the Windows platform, what native options to I have to check if a port (3306, for example) on my local machine (as in localhost), is being blocked?
Boris Pavlović
  • 1,393
127
votes
10 answers

Can you run Docker natively on the new Windows 10 (Ubuntu) bash userspace?

My understanding was that the primary limitation of running docker on other OSs was the Linux Network containers that made it possible. (Certainly for Macs). Recently Microsoft announced a beta of a Ubuntu linux user mode running natively on…
Hawkeye
  • 2,809
127
votes
16 answers

Nginx 1 FastCGI sent in stderr: “Primary script unknown”

My first time using Nginx, but I am more than familiar with Apache and Linux. I am using an existing project and when ever I am trying to see the index.php I get a 404 File not found. Here is the access.log entry: 2013/06/19 16:23:23 [error] 2216#0:…
We0
  • 1,479
127
votes
8 answers

How do I clear Chrome's SSL cache?

I have a HAProxy / stunnel server that handles SSL for our sites on AWS. During testing, I created a self-signed cert on this server and hit it from my desktop using Chrome to test that stunnel was working correctly. Now I have installed the…
Foovanadil
  • 1,370
127
votes
12 answers

How can I automatically change directory on ssh login?

I'm trying to get ssh to automatically change to a particular directory when I log in. I tried to get that behaviour working using the following directives in ~/.ssh/config: Host example.net LocalCommand "cd web" but whenever I log in, I see the…
Gareth
  • 1,496
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  • 12
125
votes
3 answers

nginx - client request body is buffered to a temporary file

I get the following error in my log files every time I try to upload a large file. a client request body is buffered to a temporary file /var/lib/nginx/body/0000000001 Although the file uploads successfully, I always get the above error. I…
Abs
  • 1,699
125
votes
5 answers

How do you do load testing and capacity planning for web sites?

This is a canonical question about capacity planning for web sites. Related: Can you help me with my capacity planning? How do you do load testing and capacity planning for databases? What are some recommended tools and methods of capacity…
gWaldo
  • 12,027
125
votes
4 answers

What is the difference between unicast, anycast, broadcast and multicast traffic?

I have never had the privilege of working in an environment that required complicated routing or if it did require it, it was handled upstream of me. I've always used very simple static routing configurations and never needed to do any multipath…
user62491
125
votes
25 answers

rm on a directory with millions of files

Background: physical server, about two years old, 7200-RPM SATA drives connected to a 3Ware RAID card, ext3 FS mounted noatime and data=ordered, not under crazy load, kernel 2.6.18-92.1.22.el5, uptime 545 days. Directory doesn't contain any…
BMDan
  • 7,379
125
votes
7 answers

REJECT vs DROP when using iptables

Is there any reason why I would want to have iptables -A INPUT -j REJECT instead of iptables -A INPUT -j DROP
Mike B
  • 12,304
124
votes
9 answers

How can I implement ansible with per-host passwords, securely?

I would like to use ansible to manage a group of existing servers. I have created an ansible_hosts file, and tested successfully (with the -K option) with commands that only target a single host ansible -i ansible_hosts host1 --sudo -K # + commands…
supervacuo
  • 1,443
124
votes
2 answers

Can I have multiple DHCP servers on one network?

This is a Canonical Question about Redundant DHCP Servers. Is it possible to have more than one DHCP server on the same LAN? What are the implications of doing this? What happens if there is more than one DHCP server available? How do my clients…
Rob Moir
  • 32,154
124
votes
7 answers

How does CTRL-ALT-DEL to log in make Windows more secure?

When logging into Windows, it says on that page that CTRL-ALT-DEL somehow makes Windows more secure. I have never been able to figure a mechanism where having to press some specific key combination before logging in makes the system more secure. I…
Eddie
  • 11,524
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