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17 views

Fastest way to perform Redis data migration?

I have several Redis 3.0 instances running in AOF persistence mode. Sometimes, I have to perform data migration from one instance to another. Data migration process currently goes like this: BGSAVE ...
0
votes
1answer
29 views

Why can't I create a symbolic link in /usr/bin?

I'm trying to create a sym link in my /usr/bin directory as the command drush8 But every time I do it, it doesn't show up in /usr/bin but instead says it already exists. It's thinking that it exists ...
0
votes
0answers
16 views

Admin scripts for RPi and ODROID XU4 on an automated UAV? [closed]

Please let me know if this isn't quite the place to ask this; I don't think that Super User was quite the place, so I thought I'd try here. I'm looking for ideas for bash scripts, or just general ...
4
votes
2answers
55 views

Tool to watch other ttys for linux?

BSD systems have a neat watch tool for snooping other ttys : Have you ever had a user login to your box and then ask you for help? Or have you ever been curious as to what your users are doing on ...
0
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0answers
15 views

What does 'addgroup' do compared to 'groupadd' [duplicate]

I am new to Linux and have started using Ubuntu. One thing I am having issues with is adding users due to the lack of easy to find information on the subject. I have noticed that there are two ...
1
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0answers
25 views

Managing cron jobs across multiple servers

We are facing a problem with managing cron jobs over multiple servers with dependencies. I hope there is an opensource central management project that I can be used to handle that and report the ...
0
votes
1answer
24 views

What's the difference between lpasswd and passwd commands?

Studying the CentOS/RHEL sysadmin manual, I can't understand if there are or what are the differences between these commands.
1
vote
0answers
24 views

How does shutting down require sudo except when done through a GUI? [duplicate]

If I want to shut down my machine programmatically or on the terminal, I must do sudo poweroff or sudo shutdown. If I want to shut down my machine through my window manager and desktop environment, I ...
1
vote
1answer
24 views

Share files/directories by setgid

To allow write access to a specific group, shared files/folders can be made writeable by default for everyone in this group and the owning group can be automatically fixed to the group which owns ...
1
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0answers
130 views

What is the command erepc? Is this malware?

I noticed that my system was running slower than normal so I ran a top command. Hogging a ton of my CPU was a process called erepc that I can find no information on. PID USER PR NI VIRT ...
0
votes
2answers
84 views

Unable to read file even though in same group

I created new symbolic link to one file(located in another user home directory) for the user. But unable to read even though the user in same group and the file permissions are 755. ...
0
votes
1answer
31 views

How to avoid receiving warning message from a mount system

I asked similar question in superuser, no satisfying answer. Re-post here with some update. I mount a remote host to my system during debug because the source code is on that host, but after I do the ...
2
votes
1answer
49 views

When is a port considered being used?

I am getting port in use cannot bind on process restarts. I am trying to find out when a port is considered being used? Is it only when in LISTEN mode? Can it also be if a connection is open to the ...
-1
votes
2answers
54 views

How to keep a development environment clean? [closed]

Working as a hobby developer on Debian/Jessie64 mostly C++ but also assembly, python, java, c, c# like compiling programs on my own like looking into other's source it results into many ...
2
votes
1answer
34 views

static ip adress for remote administrating distant home computer via ssh?

i've set up the pc of my grandmother with debian and dhcp. I have to administrate that pc, so the best option is obviously ssh. The problem with that is just dhcp changes obviously the ip adress from ...
1
vote
2answers
55 views

Weird disk usage on Enterprise Linux

I'm little bit worried about this (note the 99% used space in the root): $ df -h File System Size Used Free Use% Mounted To /dev/mapper/scientific-root 50G 50G 735M ...
0
votes
1answer
48 views

Cannot edit visudo

I have to give my user permission to run sudo. I am using CentOs # uname -a Linux lab-hv1-centos1 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux and have ...
2
votes
1answer
90 views

Winbind / AD - changed user account issue

So here's an odd one. We've had a user for years who happens to have a user id by local convention that matches a system account. So of course, I changed the users user ID in AD to avoid issues and ...
-1
votes
2answers
129 views

How do I install a program as a different user? [duplicate]

To be very specific: Debian system: I want to install Linuxbrew, when logged in as root, as a specific user. Linuxbrew enjoys the niceness of being installed by the user, for the user's specific ...
0
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0answers
54 views

How can I run a “check-up” on my Ubuntu installation?

I would like to know if there is some kind of script or utility to check for problems in my Ubuntu installation. I am new to Linux and I had some trouble setting up my system, specifically trying to ...
1
vote
2answers
46 views

Are basic system administrator utilities such as useradd or adduser standardized?

Are basic system administrator utilities such as useradd or adduser standardized? If so, where can I find the specs? (POSIX doesn't seem to encompass those, but I might need to take a better look).
0
votes
1answer
47 views

Owners and groups of everything inside /var are changed mistakenly [duplicate]

I have recursively changed owner and group of /var to root:root. I have mistakenly ran following command while standing in /var. I thought I was in /var/www, sudo chown root:root . R Now many ...
5
votes
1answer
623 views

Implications creating System Accounts “useradd -r” Linux Fedora/RHEL/CentOS

I want to know what are the implications of create an account using -r option? # useradd -r ... The help says: -r, --system Create a system account. System users will be created with no aging ...
2
votes
3answers
523 views

Do I need a computer science degree to have a successful career in Linux? [closed]

I recently got a bachelor's in hospitality management, for 4 years I basically lied to myself thinking thats what I want to study while neglecting my interest in computer science. I've been getting to ...
0
votes
0answers
143 views

transmission-remote error 301 moved permanently

I have a debian server running the bitorrent client transmission and I want to access transmission via command line. The transmission deamon runs on port 9092, for now I just want to get a list of ...
0
votes
0answers
71 views

Tasksel vs metapackages

Some debian applications are installed via tasksel, rather than the traditional apt tool. What is the benefits/differences between the methods, when we already have the option of meta-packages?
0
votes
2answers
44 views

Compare Linux configuration with default

My system fails to upgrade. I suspect it was breached. Is there a way to compare system configuration to default version that should be at this date and kernel version? My current system is Debian, ...
1
vote
3answers
6k views

Set a size limit to SAMBA shared directory remotely

I have been asked to set up a shared directory for a colleague on a server I manage. I created an account for him on that server, set up a Samba password with smbpasswd, created a directory and set it ...
2
votes
0answers
112 views

Prevent scp from overwriting existing files?

Have been googling this for a while, and the problem is not so much of one where I trust my users to "do the right thing" and have them use rsync with various options to avoid overwriting files. I ...
2
votes
1answer
211 views

NIS and /etc/passwd

Shadow passwords are to be avoided in a NIS server, as suggested in this guide at paragraph 7.6. So: in a NIS server (a Unix or Unix-like system), should all the users be migrated to /etc/passwd from ...
0
votes
3answers
625 views

/etc/passwd permissions and GECOS field

The default permissions on Ubuntu (or even some BSD) distributions for the /etc/passwd file are 644. It is pointed out in questions like this that /etc/passwd is a sort of user database and it is ...
1
vote
1answer
115 views

Unable to get last connection info for SSH users (locked, no shell, public key) is there an alternative?

I have several remote systems connecting to my server via SSH to establish tunnels. They authenticate using a public key, their user is locked and their shell is set to /usr/sbin/nologin It all ...
-2
votes
1answer
133 views

How to add StartUp application in Arch Linux [closed]

I am using Arch Linux, I want to add a start-up program in Arch Linux. How to add start-up program which will execute after login after every boot ? Note: I am not system administrator, I am just a ...
1
vote
1answer
532 views

Script to see if user has logged off

I have created this program to see if a user is logged on and it checks every minute. if [ "$#" -ne 1 ] then echo "Usage: mon user" exit 1 fi user="$1" until who | grep "^$user " > ...
2
votes
2answers
88 views

Global Shell Variables?

As a system administrator with root access on a unix machine, is it possible to provide default shell variables to all users of a system? That is, as an individual unix user, I can define ...
2
votes
1answer
100 views

Remove ex-admin user account and grant privileges / permissions / ownership to another

I would like to find the simplest way to remove the old system admin's user and group from a Gentoo server and put them all under my name instead. He no longer works here and it would appear that a ...
1
vote
3answers
85 views

Linux SW RAID and physical volumes

In each guide about software RAID in Linux, I could find online I see that people usually create/assemble RAID devices using partitions, like: mdadm --create --verbose /dev/md0 --level=5 ...
0
votes
4answers
116 views

Backup remote management protocol in case of faulty SSH server

I have a remote computer which I currently cannot access with SSH. The computer responds to ping but SSH gives connection refused, so I suspect the ssh-server is not working for some reason. What ...
3
votes
1answer
68 views

Where is the appropriate place to deploy web apps?

I am a new sysadmin (by default). We have an ubuntu 14 server with two users. Both users need to deploy web apps to the (production) server. My plan is to create a folder off of root /apps/ and ...
4
votes
2answers
873 views

Change user info on the command line

I have made a user in Mint 16 but want to change its first and last name without deleting it and starting from scratch. I know how to do it with a GUI but I want to know the terminal command ...
0
votes
2answers
129 views

Redhat subscriptions - synchronise subscriptions

I have inherited a system admin role of a small cluster of redhat machines - most running rhel5 and one machine running rhel6. My sys admin skills are at the moment poor but I would like to improve ...
8
votes
1answer
174 views

List Kerberos principals with valid TGTs

Is it possible to query my (MIT) Kerberos KDC to return a list of principals who have been issued TGTs that are currently valid? My use case is that I would like to find out which users are currently ...
3
votes
1answer
231 views

Default files in home dir for each user

I'm using ubuntu server 14.04. I want to add some files and folders by default in each user's home directory, whenever a user account is created.
0
votes
1answer
126 views

How can I tell if lack of memory is causing these crashes?

I have a tornado web server running a flask application that connects to a postgres 9.3 database on an ubuntu 12.04 box. The application has been crashing intermittently and I am trying to understand ...
1
vote
1answer
82 views

How to provision software across multiple laptops [duplicate]

I've got a bunch of laptops for my classroom and I'm using Ubuntu. I want to be able to add/update/remove software across them as easily as possible and I'm not sure how to go about it. I was ...
0
votes
1answer
370 views

telinit 1 and run a command there

I need to do some maintenance on a bunch of Debian (Wheezy) systems, and it has to happen at run level 1. But not all machines have a keyboard and a screen; some are even located somewhere else. So I ...
1
vote
1answer
45 views

How can I administer a server if USB disabled?

I'm looking to disable USB via the kernel for a high-performance server. How can I effectively administer the server, if problems occurs if USB isn't enabled? Without USB, keyboards and mice ...
2
votes
2answers
420 views

AT&T UNIX System V Release 4 - How do I create a new “Administrator” user?

I am running AT&T UNIX System V Release 4 Version 2.1 inside VirtualBox, and want to create a new "user account" for myself. At first, I simply created a new user with the useradd command, but ...
2
votes
2answers
155 views

Any interface for building a server in Linux Xubuntu. (not desktop)

Is there any interface or program that I could install on my Linux Xubuntu that would help me set up a server using the terminal as little as possible?
0
votes
1answer
43 views

How to live a Pleskless life? [closed]

I have always used Linux with Plesk when hosting web projects. It's easy to host multiple websites and setup email accounts but I realized it's overkill sometimes. I think it uses a lot of resources ...