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1500 questions
55
votes
8 answers
How is fire spread in server rooms and datacenters?
Every now and then I read that a severe fire has happened in some datacenter, lots of equipment has been damaged and customers have gone offline. Now I wonder what is there to support and spread fire?
I mean walls in a server room usually have…
sharptooth
- 2,739
55
votes
3 answers
why is loopback IP address from 127.0.0.1 to 127.255.255.254?
I do know that 127.0.0.1 ~ 127.255.255.254 are the loopback IP addresses for most modern operating systems and we could use these IP addresses to refer to our own computer. But isn't 127.0.0.1 enough?!?! why a wide range? why from 127.0.0.1 to…
kiana
55
votes
6 answers
how can I schedule a reboot in Linux?
I'm new in Linux and I want to schedule a reboot at midnight. How should I do it?
Edits:
I'm sorry I didn't put the complete details. I want a reboot every 3rd Saturday of the month at 23:30.
I don't know what's wrong but I cannot find crontab.…
klauriens
- 571
55
votes
7 answers
How can I find the LDAP server in the DNS on Windows?
For Linux, this command should return the DNS record for the LDAP server
host -t srv _ldap._tcp.DOMAINNAME
(found at Authenticating from Java (Linux) to Active Directory using LDAP WITHOUT servername)
How could I get the same on the Windows command…
mjn
- 953
55
votes
4 answers
How to check cron logs in Ubuntu?
How can I check if crontab is enabled and whether it is running properly or not in Ubuntu?
I checked /var/log/cron but this file is empty.
John
55
votes
3 answers
Find out which partition a directory is located on in Linux?
Is there a way to find out which partition a directory is located in?
I know I can use df to list partitions and mount points but I need to be able to find out which partition any directory is located in with a simple command.
Camsoft
- 1,011
54
votes
3 answers
systemd: Grant an unprivileged user permission to alter one specific service
I'm running a private game server on a headless linux box. Because I'm not an idiot, said server is running as its own unprivileged user with the bare minimum access rights it needs to download updates and modify the world database.
I also created a…
Shadur-don't-feed-the-AI
- 1,437
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
- 2,309
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
- 1,303
54
votes
7 answers
filesystem for millions of small files
Which Linux filesystem would you choose for best speed in the following scenario:
a hundred million files
~2k file size on average
>95% read access
pretty random access
high concurrency (>100 processes)
Note: The files are stored in a deep…
bene
- 2,363
54
votes
4 answers
EPEL Repo for CentOS 6 causing error
I've got a VM running CentOS 6 (64bit) and I'm attempting to add the EPEL repo like usual to install various packages as I do quite regularly.
Today, I'm experiencing some strange errors yet I'm doing absolutely nothing differently.
I'm adding EPEL…
Tom
- 719
54
votes
6 answers
How to disable AAAA lookups?
... to compensate for broken DNS servers that are outside our control.
Our problem: We deploy embedded devices that collect sensor data at various, mostly IPv4-only sites. Some sites have poorly maintained networks, e.g. misconfigured or otherwise…
Nils Toedtmann
- 3,572
- 5
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- 36
54
votes
5 answers
Piping wget output to /dev/null in cron
I am running the following command every 5 minutes in my crontab to keep Phusion Passenger alive.
*/5 * * * * wget mysite.com > /dev/null 2>&1
When I run this it performs a wget on the site url routes STDOUT/STDERR to /dev/null. When I run this…
nulltek
- 1,331
54
votes
6 answers
e1000e Reset adapter unexpectedly / Detected Hardware Unit Hang
I have a Dell 1U Server with Intel(R) Xeon(R) CPU L5420 @ 2.50GHz, 8 cores running Ubuntu Server Kernel Version 3.13.0-32-generic on x86_64. It has dual 1000baseT networking cards. I have it set up to forward packets from eth0 to eth1.
I have…
Kyle Coots
- 2,285
54
votes
5 answers
Failed tls handshake. Does not contain any IP SANs
I'm trying to set up logstash forwarder, but I have issues with making a proper secure channel. Trying to configure this with two ubuntu (server 14.04) machines running in virtualbox. They are 100% clean (not touched hosts file or installed any…
connery
- 575