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Need help with a school project: Client-Management System with linux for...

We are trying to accomplish the following:Server:serves the installation image for the clients to boot from (over PXE)distributes updates to the clientinstalls specified software on the clients...

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Reminder: back up your data!

Yesterday, after 15+ years of reliable, 24x7, clean, data-integral service, Postgresql on one of our primary DB servers decided it was time to corrupt itself in a horrible, not-immediately obvious way....

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NEED HELP! Locked myself out by sshd_config file

I sort of locked myself out of a server by putting an incorrect name in the sshd_config fileI also don't have physical access to the server [We would always just ssh in] so I can't change the...

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Extend /home w/o data destruction?

So I am trying to expand the /home with LVM and with test I've performed by adding disk/creating phisical volume/creating logical volume and then mounting that volume.. it blew away the /home dir....

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Data directories

Hello, I was wondering what you think of creating new root directories for data and backup. I've noticed a number of my servers configured with directories like this that have separate lvm volumes...

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Documentation for sysctl parameters?

I've found a magic bullet for one of my problems, namely:net.ipv4.ip_local_port_rangeMy linux beard instinct is telling me that how wide I'm setting this too (15000 65000) is dangerous. However, I...

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Process won't let go of deleted file.

There's a mission critical service that really can't be stopped. The log was getting big, so we decided to manually rotate. The log file was deleted before the service was HUPed. Now, the process is...

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What do enterprises most commonly use RHEL/CentOS Servers for?

I would like to setup a RHEL lab that can simulate some of the common scenarios that RHEL servers are being deployed to do in enterprise environments. What I'd like to know is, what are these servers...

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sysctl.conf changes re fs.file-max not "taking"....

I'm setting up a new 389-ds server and the redhat instructions advise to increase the File Descriptors from default to 64000 by editing /etc/sysctl.conf with the linefs.file-max = 64000 Alternatively...

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Getting GID/UID from AD

So I copied GID/UID (unix attributes installed in AD) from LDAP to Active Directory. Setup samba and its all fine regards to user authenticating with their AD creds, however when I look at their...

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Testing network speeds WITHOUT using HDD, on a restricted linux system --...

I got a weird one. I have two virtual hosts. I have limited toolsets as they are restricted vendor images that I can't go apt-get installing on. I want to test out the virtual networking on these, to...

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Remotely start graphical session on multiple desktops at the same time

Hi everyone,My gf's school asked me if I could help them to install and configure a computer classroom. They have a lot of old machines so I installed a LTSP server, put a lot of RAM inside and...

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accidentally created partition on disk that had LVM pvs. Remedy suggestions ?

So I have a server. I login to do some work, and forgot this has LVM. I fdisk the system, and no errors are encountered. I create a new table and exit. I did not reboot. The system is still seeing the...

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Help appreciated! Ubuntu Servers keep going down, can't figure out why!

We have three quasi-embedded systems with a MiTAC Mitac PD11BI motherboards running Ubuntu 14.04.3 Desktop (application requires GUI) and Kernel 3.19.0-28-generic that have been randomly locking...

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When I ln and create a Hard Link to an existing inode, how do I query the...

I create a Hard Link with ln, then remove the original file. Of course I need the data in the original file and remember there was a Hard Linked file somewhere... But where? How do I query the inode...

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Just graduated high school and want to become a sys admin, where do I start?

Ive been using linux for about 2 years now and I feel my skills have greatly improved. I want to have a career with linux in my future but im not sure how I should go about doing that. What college...

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When I start learning about Linux administration right now, should I lean...

I'm using Linux for quite some time and always learned 'a little bit' of advanced stuff but now I decided that I want to go down the route of becoming a system administrator.A major difference in how...

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Disable all timestamps?

/r/rlinux4noobs suggested I try hereI am running Ubuntu. My root drive is ext2 and my data drive is NTFS (a leftover from the days the Windows partition was occasionally booted into). I have enabled...

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Losing / Usable disk with Glusterfs

Hi there,I have a question:We are setting up 5 new servers with 4 disks of 1 TB each. We are planning of using LVM Mirror so we have protection over our data.My question is, if I lose a disk, since we...

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How do I remove every occurence of duplicate line in a file, except the first...

Hi,I hope this is proper subreddit. If not, please let me know. I think it is, since it is about bash script. Yea, i know very newbie bash script, and I was wondering if I shouldn't post it on...

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