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1500 questions
44
votes
4 answers

Rogue DHCP Server Can't be found

Over the last 3-4 weeks I have been trying to find a rogue DHCP server on my network but have been stumped! It is offering IP Addresses that do not work with my network, so any device that needs a Dynamic Address is getting one from the Rogue DHCP…
Dave Stuart
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2 answers

Which RFCs should be cited as internet standards?

It's extremely common for RFCs to be cited in support of opinions (including Serverfault Q&A's), but the average IT employee has a very poor understanding in regards to which RFCs define standards and which ones are purely informative. This should…
Andrew B
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2 answers

docker-compose: option to automaticaly remove container after run in docker-compose.yml

The docker-compose run reference states that it has the --rm option to Remove container after run. I want to make this a default run behavior for some of services I specify in docker-compose.yml. So, the questions are: Can it somehow be…
Ivan Kolmychek
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44
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5 answers

Steps for limiting outside connections to docker container with iptables?

My goal is to limit access to docker containers to just a few public IP addresses. Is there a simple, repeatable process to accomplish my goal? Understanding only the basics of iptables while using Docker's default options, I'm finding it very…
GGGforce
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44
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2 answers

Convert value of an Ansible variable from lower case to upper case

I am working on a playbook to join linux systems to Active Directory. I can't seem to find a way to convert the value of ansible_hostname to uppercase. One of the commands I need to run requires the hostname to be supplied in uppercase.
grahamjgreen
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44
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3 answers

How do I tell if grub is installed on a device?

How can I tell if grub is installed on a disk, and if it is what settings it has (noteably, what it has for the root parameter) I need to check a lot of disks in software RAID1 arrays to make sure both disks have grub installed, with the grub on…
DrStalker
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44
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5 answers

What is a T1 in modern terms?

I often hear this term used "We have a T1"... used on SF and other sites. I googled it and it seems like an ancient technology possibly related to frame relay but I'm not sure. Maybe things have changed and the term means different things…
hookenz
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44
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5 answers

How do I schedule a reboot on Linux?

I'd like to be able to schedule a server reboot at a specific time, but not regularly. How can I do this without futzing with adding and removing cron entries?
jldugger
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5 answers

Rsync command issues, owner and group permissions doesn´t change

I´m trying to set owner and group via rsync and it doesn't seem to be working. This is the command: sudo rsync -rlptDvz --owner=cmsseren --group=cmsseren /home/serena/public_html/ -e ssh root@ip:/home/cmsseren/public_html2/ The files sync correctly…
Arnoldo Bazaldua
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44
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8 answers

Slicehost vs Linode

Slicehost.com vs Linode.com Which one do you recommend? Are there any major differences between these two? What are your personal experience?
Jakub Arnold
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44
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3 answers

Create new vsftpd user and lock to (specify) home / login directory

I need to periodically give temporary and limited access to various directories on a CentOS linux server that has vsftp installed. I've created a user using useradd [user_name] and given them a password using passwd [password]. I've created a…
zigojacko
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44
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2 answers

How do I enable additional debugging output from Ansible and Vagrant?

I am investigating Ansible for server and application provisioning. My application is currently provisioned with shell scripts in Vagrant. Rather than rewriting my scripts, I took a sample and attempted to deploy it. It appears to deploy fine, but I…
Brian Lyttle
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44
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1 answer

How do StatsD and CollectD relate?

How do StatsD and CollectD relate? Is StatsD and alternative to CollectD Is StatsD used to aggregate metrics coming from CollectD (and possibly other tools) something else entirely. If so what?
Gbrits
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44
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11 answers

Does an unplugged hard drive used for data archival deteriorate?

If I were to archive data on a hard drive, unplug it, and set it on a (not dusty, temperature-controlled) shelf somewhere, would that drive deteriorate much? How does the data retention of an unplugged hard drive compare to tapes?
Jim Hunziker
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44
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9 answers

Who uses Mac OS X Server and why?

I am really curious. Mac OS X as a server sounds like a very expensive solution that is not much better than the free one provided by free software. I understand paying extra for a nice UI and an Apple logo on your desktop computer or laptop (I did…
Pablo
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