Questions tagged [sysadmin]

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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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logfile for image hotlinking protection

In my nginx config location = "/fake-hotlink-stub" { internal; if (!-f "image-physical-path/myimage.jpg") { return 403; } rewrite ^ "/myphoto.jpg" last; This allows me ...
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1 answer
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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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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 ...
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1 answer
467 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), ...
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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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Is it normal NGINX http upstream check status to be public?

I am newbie in pentest. I pentest a website, where I found a service "NGINX http upstream check status" in public, with private IPs and ports linked to internal servers. I am wondering if it'...
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How writing a syslog in file without writing them in /var/log/messages

I would like to write logs from network switches in a special file. Here is my code: cat /etc/rsyslog.d/test.conf $template syslog,"/var/log/clients/%fromhost%.log" *.* ?syslog It work ! ...
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142 views

treatments of /var/log/messages with rsyslog

I having problems with my /var/log/messages file. Indeed, I collect logs from different network switches on my server and their logs go in a special file + the messages file. I would like the switch ...
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38 views

Run systemd namespaced unit on failure of any unit

I have a namespaced unit to send an email saying that a given service has failed. I know that you can add OnFailure units to an individual unit in order to run the specified units when it fails. ...
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A tool to split tree into subtree groups

Let's say I have a textfile with an exported list of filenames (e.g. files that have been created too long time ago or that are too large). The list is pretty huge (100k+ files). I don't have direct ...
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How to resize one partition with another free one uder different device name without unmounting the first one?

I want to extend one partition on sda with another on different dev sdb the below image shows the distribution of the partitions What I'm looking for is to let sda5 resized by sdb1? How can I do that ...
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Windows, Collect information that requires admin rights

I'm making an enterprise dashboard for system status/etc but finding that most of the commands I'll need to run on individual servers, will require administrative privileges to collect the data. For ...
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2 votes
1 answer
137 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 ...
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Nginx reverse proxy with Tomcat without showing the in 8080 in IP

I have sucessfully proxy passed tomcat 1XX.XXX.XXX.XXX:8080 to 1XX.XXX.XXX.XXX through NGINX . Both 1XX.XXX.XXX.XXX:8080 and 1XX.XXX.XXX.XXX has and shows same thing. server{ listen 80; server_name ...
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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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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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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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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 votes
2 answers
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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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1 vote
2 answers
766 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 ...
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471 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:...
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2 answers
127 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 ...
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2 votes
2 answers
136 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 ...
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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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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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-1 votes
1 answer
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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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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 votes
1 answer
445 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? (...
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2 votes
1 answer
641 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 ...
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294 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.
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3 votes
2 answers
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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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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 answer
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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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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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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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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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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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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 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: ...
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-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 ...
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1 vote
2 answers
72 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 ...
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2 answers
42 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 ...
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1 vote
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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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3 votes
1 answer
451 views

What is a good subnet strategy for AWS VPC? [closed]

I currently have each VPC per cluster (stg, prd, tst, misc) and the standard clusters (stg, prd) have these subnets: elb: for public elb(s) that will received direct public traffic elb-int: for ...
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1 vote
1 answer
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Windows Admin Center Doesn't Connect

I've installed version 1804.25 of Windows Admin Center (WAC) onto my Windows 10 Pro v1709 laptop. I accepted the WAC self-signed cert, provided by the installer, on first page load. I then used the ...
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2 answers
720 views

Custom AdminSDHolder protected objects

I have a task to remove adminCount and restore permisions inheritance for all users that are no longer member of protected groups. However there are few groups that were created by our organization ...
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3 answers
249 views

Is there a way to find hidden options and arguments on for a command / package that isnt documented?

On Linux if I install a new package and it contains commands I haven't used before, is there a way to find hidden options and args that are not documented in the MAN page or with the --help option. ...
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Does Windows Admin Center have a plugin system?

Does the Windows Admin Center support writing plugins? I can't find a lot of information on it, and I was wondering if it had a plugin system that I could write C# .NET applications for. I want to be ...
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3 votes
1 answer
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W10 RSAT Installation Issue

I am having issues installing Remote Server Administration Tools on my W10 Pro laptop. This is my attempts and issues so far: Download WindowsTH-RSAT_WS2016-x64.msu from here: Remote Server ...
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