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1500 questions
45
votes
5 answers

Can you help me with my software licensing issue?

This is a Canonical Question about Licensing. Questions on licensing are off-topic on Server Fault. If your question has been closed as a duplicate of this question, then this is because we want to help you understand why licence questions are…
Ben Pilbrow
  • 12,049
45
votes
7 answers

View content of memcached

Are there any tools to explore what is currently cached inside a memcached pool? Not some much graphs, but the actual key/values currently stored.
Tom
  • 766
45
votes
7 answers

View Shutdown Event Tracker logs under Windows Server 2008 R2

I'm trying to view the Shutdown Event Tracker logs in the Event Viewer, on windows server 2008 r8, but I can't find the messages that I supplied when previously restart the server. Where in the Event Viewer can I see these logs?
stacker
  • 841
45
votes
4 answers

What's the best way to get info about currently unmounted drives?

First, the situation: I've got a Linux computer with two eSATA drive bays that accept removable SSD drives. I'm trying to write a little GUI application that makes it easier for the user to mount/unmount/format/backup/etc the drives that he puts…
Jeremy Friesner
  • 1,343
45
votes
2 answers

how to update a symbolic link target (ln -f -s not working)

I'm using ln -f -s /var/www/html/releases/build1390 app-current to update symbolic link "app-current" with a new destination. However, this doesn't work, the link "app-current" keeps it original destination, however, I don't get any…
solsol
  • 1,131
45
votes
5 answers

Nginx vs Apache as reverse proxy, which one to choose

this kind of question maybe has been asked here but I couldn't find any that really match my question. Heard that nginx performance is quite impressive, but Apache has more docs, community(read:expert) to get help Now what I want to know, how both…
mhd
  • 655
45
votes
22 answers

PowerShell? Do you use it? Can you show me some cool system administration things I can do with it?

I keep reading everywhere that PowerShell is the way of the future. When it was first released I did a whole bunch of virtual labs, but since then I still haven't used it in a production environment. I know the day will come when I'm dealing with…
Nick Kavadias
  • 10,836
45
votes
7 answers

Forward local port or socket file to remote socket file

Quick question - I run two linux boxes, one my own desktop and the other my VPS. For security reasons on the VPS end I opted for socket connections to MySQL (/var/run/mysqld/mysql.sock). I know I can tunnel like this: ssh -L 3307:127.0.0.1:3306…
user32616
45
votes
7 answers

How to find memory usage of individual Windows services?

Task Manager shows the overall memory usage of svchost.exe. Is there a way to view the memory usage of individual services? Note this is similar to Finegrained performance reporting on svchost.exe
Aidan Ryan
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45
votes
4 answers

How to list symbolic link chains?

Given this example: mkdir a ln -s a b ln -s b c ln -s c d If I execute: ls -l d It will show: d -> c Is there a way for ls or any other linux command to show d -> c -> b -> a instead?
Kalecser
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45
votes
10 answers

PostgreSQL Replication

We constantly bat this around the office, and the question continues to come up. How do you deal with PostgreSQL replication? I'm not even necessarily talking about advanced clusters, just keeping it simple with Master-Slave, Master-MultiSlave, and…
f4nt
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45
votes
13 answers

How to get a list of all IP addresses (and ideally device names) on a LAN?

Our network gave an error that there was an IP address conflict and I'd like to find what all the device IP addresses are. (I've also had need of that before). (update/clarification:I'm looking for a Windows-based too.) Any suggestions? I've read…
Clay Nichols
  • 1,513
44
votes
2 answers

Setting ssl_prefer_server_ciphers directive in nginx config

This question is about setting the correct value of ssl_prefer_server_ciphers while configuring nginx. According to a fairly typical config suggested by Mozilla, the value should be off (source:…
Hassan Baig
  • 2,545
44
votes
5 answers

Force systemd timesyncd to sync time with NTP server immediately

I've configured systemd timesyncd to get it's time from a NTP server: /etc/systemd/timesyncd.conf > NTP=ca.pool.ntp.org systemctl restart systemd-timesyncd.service timedatectl set-ntp true The status is the following: $ timedatectl…
manifestor
  • 6,409
44
votes
10 answers

Does CPU power management affect server performance?

I was doing some simple hand benchmarking on our (live) database server during non-peak hours, and I noticed that queries returned somewhat erratic benchmark results. I had enabled the "Balanced" power saving plan on all our servers a while ago,…
Jeff Atwood
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