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Questions tagged [sysadmin]

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Effective computational resource management for a server shared by multiple users [closed]

What would be the optimal approach to effectively manage and restrict CPU and memory resources on a server utilized by a group of approximately 50 users? The server in question is a single-system-...
Piotr M's user avatar
  • 31
1 vote
1 answer
37 views

old hardware - certified EOL OS vs. uncertified current OS [closed]

If you are a small business and have some old, non-internet-facing servers around, what are the pros and cons for dealing with the OS situation? We have an old server that is used for numerical and ...
Dohn Joe's user avatar
  • 111
0 votes
0 answers
109 views

Communication failure between agent and Zabbix Docker server

Currently I have the following scenario: First server: I have the Zabbix components: server, gateway and web interface (along with a mysql database), all running via Docker containers (released port: ...
rhuanpk's user avatar
0 votes
1 answer
109 views

Send An E-mail To A GMAIL Address From Linux Mail Command Using Postfix As The MTA

I am a beginner in configuring mail delivery systems. Recently, orders came from the management that we need to send confirmation emails to our clients whenever they complete their applications (I ...
Minmin's user avatar
  • 1
0 votes
0 answers
127 views

How to create a non-admin user in OpenBSD to be able to login as a root like in Linux-based systems?

Usually, in Linux-based systems I create new user without admin rights (sudo group). I'm able to login as that user via SSH and then, when I need admin rights, I can just, $ su root ...entering pwd... ...
Emilien Vidal's user avatar
1 vote
1 answer
41 views

Software that prevents downloads from websites on workstations

I am a SaaS developer who has a popular website that services users in financial institutions. As we have grown i have noted that an increasing number of our end users are having downloads or uploads ...
SaaSGuy33's user avatar
0 votes
0 answers
83 views

Is there anyway I can run an arm64 VM using Cockpit on a amd64 machine?

I am currently facing a challenge with integrating Cockpit on my AMD64 machine for managing both AMD64 and ARM64 virtual machines. I have successfully run an ARM64 machine on my AMD64 machine using ...
aggarcia's user avatar
0 votes
0 answers
23 views

Updating the `/etc.ufw/before.rules` file to allow `ufw` firewall redirection

I need to Configure My Server so that the ufw firewall running on it can redirect port 8080/TCP to port 80/TCP. From quick research, I know I can do it in Two ways; one is to run a command similar to; ...
greez''s user avatar
  • 1
0 votes
1 answer
29 views

how can i increase OS FS on CentOS?

we have CentOS server installed on 83GB FS size while the OS disk size is 480gb how can we increase the FS to use the whole disk (sda, 480gb)? [root@server ~]# df -kh Filesystem Size ...
noamsh88's user avatar
0 votes
0 answers
202 views

Win 10 VM loses connectivity randomly. Hyper-v, SET teaming, Server 2022

Deployed a new hyper-v server a few weeks ago and during install I read that the old way of NIC teaming does not work anymore for vswitches inside of a hyper-v. It was replaced with SET Teams that ...
Ryan D's user avatar
  • 1
1 vote
1 answer
77 views

Office administrative department requesting "admin" namespace

Our system administration (technology) department manages and maintains our servers and internet systems. It uses the admin namespace. An example is admin@example.com . Our company newly formed an ...
block14's user avatar
  • 111
0 votes
0 answers
15 views

How to delete shared network folder

I am the administrator and have all the necessary access rights but not able to delete. What should I do?
OSS IT's user avatar
  • 25
0 votes
2 answers
167 views

How can my team use a single SuperPuTTY session file?

I work in a team that uses SuperPuTTY (on Windows) to connect to remote devices. We currently use our own session files, but not everyone notifies the team when a new device needs to be added/removed ...
M455's user avatar
  • 1
0 votes
1 answer
53 views

How do I allow a device to only connect to certain wifi networks?

I have been assigned to a task that a laptop should be connected to particular wifi Network, i.e Laptop should not connect with any other wifi network other than office wifi. is that possible??? any ...
Kani's user avatar
  • 1
0 votes
1 answer
92 views

How to change the super user after installation in Ubuntu?

I have taken over the system administration on an ubuntu system from someone else. I had an normal user account on this system before, that I am still using. The previous admin made me sudoer, so in ...
hcr's user avatar
  • 15
0 votes
0 answers
118 views

Ubuntu + Pound 3.0 (load balancer) errors when on port 80

When I start up pound with service it does not log the error in syslog but when I start it with 'pound -d 3' 7F1384113640 thr_http start /build/pound-lNcD5I/pound-3.0/src/http.c:535 7F1384113640 start ...
James Brake's user avatar
1 vote
1 answer
32 views

Computer cluster admin: how to limit users running program but permit file transferring

I am managing a small computer cluster with slurm on CentOS 7. I want to discourage users to run programs on login node. This can be achieved by adding user hard cpu 1 to file /etc/security/...
wdg's user avatar
  • 143
1 vote
0 answers
442 views

ClientAliveInterval is not closing the idle ssh connection

I have the task to close the idle ssh connection if they are idle for more than 5 minutes. I have tried setting these value on sshd_config TCPKeepAlive no ClientAliveInterval 300 ClientAliveCountMax 0 ...
Noobie's user avatar
  • 129
1 vote
1 answer
2k views

AntiVirus for AWS Linux 2 EC2

Is there antivirus software recommended to install AWS Linux 2 system?what would you recommend we install for that? In my infra, I'm using the following AWS services:: EC2 (Seoul, Ohio, and Virginia), ...
samtech 2021's user avatar
0 votes
1 answer
97 views

What's the best practice for setting up new servers?

I'm facing the problem that from time to time, when installing a new system, be it virtual machines in VMWare, be it new VDS of the customer's server, I have to constantly install the same packages (...
RoyalGoose's user avatar
5 votes
2 answers
518 views

CentOS: Admin user on xrdp session can't do admin

I'm running a Rocky Linux 8.4 workstation with GNOME and MATE desktops, but I've seen the same problem on CentOS 7.9... When I log into the machine on the local display, I can do things like ...
kbro's user avatar
  • 260
0 votes
1 answer
76 views

Migrate from OpenFire to Ejabberd

Can I migrate from OpenFire to Ejabberd with full data(contacts, messages, etc)? I found only one solution for migration: export from OpenFire only contacts.
demon's user avatar
  • 1
0 votes
0 answers
283 views

Squid Proxy with ten of thousands of cache peer

I tried having 20 lines of cache_peer and its working correctly, however when i added ten of thousands of cache_peer, and i cant really connect to it. Any idea why ? My goal is to have hundred or ...
sccccc's user avatar
  • 1
1 vote
0 answers
123 views

slow environment with high CPU usage [closed]

I'm new to Linux metrics in our test environment we experiment a slowness, after investigation we have found that the disk space used to store backup data is full, but what is wired for me is that the ...
Hamza AZIZ's user avatar
0 votes
0 answers
331 views

Ansible playbook not running : Import error

enter image description here ansible-playbook -v -i Monitoring/hosts Monitoring/main.yml [WARNING]: log file at /var/log/ansible.log is not writeable and we cannot create it, aborting Using /etc/...
Nick's user avatar
  • 1
3 votes
2 answers
304 views

Is there a real point to using "Run as" local admin accounts instead of logging in as a local administrator?

Let's start by setting the scene -- I'm a junior systems administrator tasked with conducting a transition of the company towards a "Least-Privilege" model. This includes removing admin ...
Akala Volo's user avatar
1 vote
2 answers
1k views

Reverse IP Lookup to Find A Records at IP Address

I want to know if there is a Linux terminal command for getting all the domains associated with an IP address. Or more correctly - find out all the sites hosted on that server IP and/or aall the A ...
RustyFluff's user avatar
0 votes
1 answer
943 views

Windows Admin Center Powershell access denied

I'm using the latest version of Windows Admin Center (2103) and when attempting to use the Powershell console within WAC, after supplying my credentials, the connection always fails with the following:...
Ryan DiFrancesco's user avatar
0 votes
2 answers
201 views

Best and simple way to prevent automatic backups filling all disk space in Linux, before it actually happens

Which do you think is the best and most simple way to prevent automatic backups filling all disk space in Linux, before it actually happens? I would like to automatically recycle the oldest ones when ...
fjcobas's user avatar
  • 11
2 votes
2 answers
227 views

Should I chose higher CPU/low bandwidth or slightly slower CPU/higher bandwidth?

I have some servers that do a lot of file zipping operations. This also means that all the files have to be remotely downloaded first before being zipped and remotely uploaded, or remotely streamed to ...
Edwinner's user avatar
  • 121
1 vote
0 answers
47 views

What is the standard way to install jdk for wildfly on production?

There are options like, install from repo, install from rpm and install from tar/zip/etc archive What are the pros and cons? One con of installing from archive is, you don't get security updates. Is ...
gk_2000's user avatar
  • 11
0 votes
1 answer
71 views

How to stop my server from bruteforcing another [duplicate]

There are so many resources on how to stop bruteforce attacks on your server, but I can't find any good on bruteforce attacks FROM a shared hosting server. I am getting a lot of reports from many ...
JoeRoot's user avatar
  • 101
-1 votes
1 answer
41 views

With Domain Controller admin access, how can I see which systems users are logged into?

I have a nifty list of users here in my "pumpkin" group. I was hoping it would be easy for me to check who is logged in for several reasons: I don't want to interrupt a user with a prompt......
bluesquare's user avatar
0 votes
1 answer
32 views

How to backup Linode configuration

I have setup LEMP on Ubuntu 18.04 Linode. I have configured all my required settings for my laravel app. Can someone advise how to backup these settings so that I can use the same settings for ...
Codester's user avatar
2 votes
1 answer
588 views

Create a domain GPO with cmd only [closed]

I have a domain controller running Server 2003 and the goal is to create a GPO for the domain without using a GUI program (no gpedit, gpmsc, etc.). How can I achieve this goal by using cmd only? (...
w0rmh013's user avatar
2 votes
1 answer
1k views

ubuntu KVM guest with no network connection after configuring network bridge

I am trying to add KVM guest (Ubuntu 18.04) to local network like other real servers in the network. I configured KVM bridge interface in the host system (Ubuntu 18.04) and it works fine with ...
NoACoder's user avatar
0 votes
0 answers
303 views

Converting bulk Mailboxes in Office365 to Shared Mailbox

It would be practical to as a sysadmin to convert parallelly the mailboxes of more than a user to shared? In the O365 admin console off course.
Jwan's user avatar
  • 11
4 votes
2 answers
3k views

Can Windows Admin Center connect to a remote server?

I was thinking that through one Windows Admin Center installation I'll be able to manage several remote Win servers. However, the add server dialog seems to be able to find only local/LAN servers. Is ...
mivra's user avatar
  • 153
0 votes
1 answer
1k views

Tomcat running on 8080 port but Fails to redirect to 8443 HTTPS port .. The 8443 port is running but cant access in web

I have deployed webapps with apache-tomcat-8.5.37. It had ssl and was working fine but when I tried to renew the ssl and installed JKS file it started to show different problems. I have resolved ...
Bhuwan Bhandari's user avatar
0 votes
1 answer
101 views

Create installable disk image from existing hard drive

I installed a SLES 15 machine with a special library of my work. Since I need to install other machines with the same procedure, I want to "extract" the current installation to create an installable ...
forgeronvirtuel's user avatar
0 votes
0 answers
37 views

Dell PowerEdge R630 Server swap

Our pro support with Dell is coming up on expiration for our production Dell PowerEdge R630 servers. Rather than spend approx $20k to renew pro support, our project leads have suggested another ...
M.Clark's user avatar
  • 11
1 vote
0 answers
634 views

How to Check for the Java Process Running on All Network Computers?

Due to Oracle's shenanigans, our organization has decided to remove JRE from all computers under our maintenance contract. They've also decided to not replace it with OpenJDK JRE, so I've been tasked ...
DeathNTaxesNTaxes's user avatar
0 votes
1 answer
75 views

Does redhat system admin and engineering certificate (RHCSA) and (RHCE) work for all Unix-like operating systems? [closed]

Does redhat system admin and engineering certificate (RHCSA) and (RHCE) work for all Unix-like operating systems? or Can a Redhat Engineer or System admin work for a debian based companies or systems?
Cracker's user avatar
  • 13
1 vote
1 answer
366 views

Puppet - disable a user

I'm taking over an old puppet master, and I need to disable a user. I'm aware of "present", "absent", and "role", and they seem to be the only ones available. I've been searching and honestly can't ...
OH MY DEAR PUFFINS's user avatar
0 votes
0 answers
30 views

OCSInventory handover table and form

I need to make some kind of handover table. Records would look like this: PC , user , action , date; X , Y , return , 10.07; X , Z , hire , 11.07; A , Y , hire , 16.07; etc. Each record would ...
Pigeonnn's user avatar
1 vote
1 answer
2k views

Windows server 2016 Administrator account has no permissions

I was changing settings around so that users can only use specific applications; however, I didn't realize that it was going to affect admin rights in the same way. The error I'm receiving is this: ...
Kyle Wilkins's user avatar
-1 votes
1 answer
45 views

Azure Permissions in Large Organizations [closed]

I know this question is a little subjective. My intent is to just ask how typical large organizations setup their cloud permissions. I'm particularly interested in Azure implementations. I'm a ...
cobolstinks's user avatar
1 vote
2 answers
75 views

Best practices for keeping/curating organizational ops knowledge [closed]

This is a somewhat broader question about a topic I think every organization/business is running into once there's more than one DevOps person: How to keep and curate organizational operations ...
CDO DevOps's user avatar
0 votes
2 answers
93 views

UnAuthorized use of tc command

I work in a small product company. I am part of team of size 4 that is building a deployment pipeline for our product My company has also hired a freelance devops consultant who helps us in managing ...
jack's user avatar
  • 1
1 vote
0 answers
48 views

How to find which processes caused the system slowdowns? To be used after reboot

For the last few days my Ubuntu 16.04 suffers random slowdowns that it prevents the apps from loading and doesn't even allow me to connect via SSH. The only way I can resolve it is by rebooting the ...
Juan Martin's user avatar