Questions tagged [sysadmin]
The sysadmin tag has no usage guidance.
57
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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-...
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1
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37
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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 ...
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109
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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: ...
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0
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1
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109
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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 ...
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127
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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...
...
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1
answer
41
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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 ...
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83
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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 ...
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23
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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;
...
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29
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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 ...
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202
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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 ...
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77
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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 ...
- 111
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15
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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?
- 25
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2
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167
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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 ...
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53
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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 ...
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1
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92
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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 ...
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118
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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 ...
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1
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32
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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/...
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442
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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
...
- 129
1
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1
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2k
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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), ...
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1
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97
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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 (...
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2
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518
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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 ...
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1
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76
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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.
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283
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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 ...
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123
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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 ...
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331
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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/...
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3
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2
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304
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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 ...
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2
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1k
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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 ...
- 111
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1
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943
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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:...
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2
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201
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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 ...
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227
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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 ...
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47
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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 ...
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71
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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 ...
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41
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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......
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32
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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 ...
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2
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1
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588
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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? (...
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1k
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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 ...
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303
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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.
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2
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3k
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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 ...
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1k
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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 ...
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1
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101
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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 ...
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37
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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 ...
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634
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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 ...
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1
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75
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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?
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366
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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 ...
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30
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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 ...
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1
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2k
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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:
...
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45
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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 ...
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2
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75
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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 ...
- 151
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2
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93
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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 ...
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0
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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 ...
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