Match linux command-line arguments to view their help text.
Tag: SysAdmin
system administrator related links
stackshare.io
Dev / Production stacks for all to see. Handy tool to see what software is trending today.
aws.amazon.com
Amazons’s cloud computing & web hosting service.
AWS CodePipeline introduces new debugging experience in AWS Management Console
16 January 2025 @ 9:00 pm
AWS CodePipeline now offers an enhanced debugging experience in the AWS Management Console, enabling you to identify and resolve pipeline failures more efficiently. The new debugging interface introduces a dedicated debugging page, accessible through the left navigation bar's "Action details" button. This page presents a simplified pipeline view with execution and action details displayed in a side panel. This streamlined layout allows you to easily monitor the pipeline process and quickly debug action failures. This feature is now available in all AWS Regions where CodePipeline is supported, excluding AWS GovCloud (US) Regions and China Regions. For more information about AWS CodePipeline, visit our product page.
The AWS Management Console now supports simultaneous sign-in for multiple AWS accounts
16 January 2025 @ 6:30 pm
Today, AWS announces multi-session support, which enables AWS customers to access multiple AWS accounts simultaneously in the AWS Console. AWS Customers can sign-in to up to 5 sessions in a single browser, and this can be any combination of root, IAM, or federated roles in different accounts or in the same account. Customers scale their applications using multiple accounts following AWS best-practice guidelines. They use accounts for different environments such as development, testing, production, and compare resource configurations and statuses across multiple accounts for troubleshooting application issues and other application related jobs. Using multi-session capability in the AWS Console, customers can now sign-in to multiple AWS accounts and manage their resources in a single browser. Multi-session support is available in all Commercial Regions. Try it today by signing in to the AWS Console, select
AWS Resource Explorer supports 29 new resource types
16 January 2025 @ 6:00 pm
AWS Resource Explorer now supports 29 more resource types across all AWS commercial Regions from services including Amazon FSx, Amazon Route 53, and AWS Glue. With this release, customers can now search for the following resource types in AWS Resource Explorer:
acm:certificate
codepipeline:webhook
comprehend:document-classifier
comprehend:entity-recognizer
databrew:job
databrew:project
dataexchange:data-sets
dms:es
dms:subgrp
elasticmapreduce:cluster
emr-containers:virtualclusters
frauddetector:external-model
frauddetector:model
fsx:file-system
glacier:vaults
glue:crawler
greengrass:connectorsDefinition
greengrass:coresDefinition
greengrass:devicesDefinition
greengrass:functionsDefinition
greengrass:loggersDefinition
greengrass:res
Amazon Connect Contact Lens dashboards now provide configurable groupings and filters
16 January 2025 @ 6:00 pm
Amazon Connect Contact Lens dashboards now allow you to define widget level filters and groupings, re-order and re-size columns, and delete or add new metrics. With these dashboards, you can view and compare real-time and historical aggregated performance, trends, and insights using custom-defined time periods (e.g., week over week), summary charts, time-series chart, etc. Now, you can further customize specific widgets to create dashboards that best fit your business needs. For example, you can create a single line chart that combines contacts queued, average queue answer time, and abandoned contacts, filtered for your most important queues, so you can quickly see how increasing contact volumes impact both wait time and customer abandonment rates. These dashboards are available in all commercial AWS regions where Amazon Connect is offered. To learn more about das
Amazon EC2 I8g instances are now available in Europe (Frankfurt) region
16 January 2025 @ 6:00 pm
Starting today, Amazon EC2 I8g instances are available in Europe (Frankfurt) region. I8g instances offer the best performance in Amazon EC2 for storage-intensive workloads. I8g instances are powered by AWS Graviton4 processors, delivering up to 60% better compute performance compared to previous generation I4g instances. I8g instances use the latest third generation AWS Nitro SSDs, local NVMe storage that deliver up to 65% better real-time storage performance per TB while offering up to 50% lower storage I/O latency and up to 60% lower storage I/O latency variability. These instances are built on the AWS Nitro System, which offloads CPU virtualization, storage, and networking functions to dedicated hardware and software enhancing the performance and security for your workloads. I8g instances offer instance sizes up to 24xlarge, 768 GiB of memory, and 22.5 TB instance storage. They are ideal for real-time applic
Introducing new larger sizes on Amazon EC2 Flex instances
16 January 2025 @ 6:00 pm
AWS announces the general availability of two new larger sizes (12xlarge and 16xlarge) on Amazon EC2 Flex (C7i-flex, M7i-flex) instances. The new sizes expand the EC2 Flex portfolio, providing additional compute options to scale-up existing workloads or run larger sized applications that need additional memory. These instances are powered by custom 4th Gen Intel Xeon Scalable processors, that are available only on AWS, and offer up to 15% better performance over comparable x86-based Intel processors utilized by other cloud providers. Flex instances are the easiest way to get price performance benefits and lower prices for a majority of compute-intensive and general-purpose workloads. They deliver up to 19% better price performance than comparable previous generation instances and are a great first choice for applications that do not fully utilize the compute resources. Flex instances are ideal for web and application servers, batch processing, enterprise applications, datab
Amazon EC2 R8g instances now available in additional regions
16 January 2025 @ 6:00 pm
Starting today, Amazon Elastic Compute Cloud (Amazon EC2) R8g instances are available in AWS Asia Pacific (Sydney) and AWS Europe (Spain) regions. These instances are powered by AWS Graviton4 processors and deliver up to 30% better performance compared to AWS Graviton3-based instances. Amazon EC2 R8g instances are ideal for memory-intensive workloads such as databases, in-memory caches, and real-time big data analytics. These instances are built on the AWS Nitro System, which offloads CPU virtualization, storage, and networking functions to dedicated hardware and software to enhance the performance and security of your workloads. AWS Graviton4-based Amazon EC2 instances deliver the best performance and energy efficiency for a broad range of workloads running on Amazon EC2. AWS Graviton4-based R8g instances offer larger instance sizes with up to 3x more vCPU (up to 48xlarge) and memory (up to 1.5TB) than Gravito
Amazon Connect Contact Lens launches new real-time dashboard
16 January 2025 @ 6:00 pm
Amazon Connect Contact Lens now offers a new dashboard that lets you monitor real-time agent activity and take immediate actions such as listen-in to a contact, barge (take over) a contact, or change an agent state in a few clicks from a single interface. With this dashboard, you can view and compare real-time and historical aggregated performance, trends, and insights using custom-defined time periods (e.g., week over week), summary charts, time-series chart, etc. Now, you can track how long an agent has been on after contact work, color code time in specific statuses, and listen into live contacts that need immediate attention. For example, you can automatically highlight in red if an agent is an error state to give a quick visual indicator of where agents might need additional help to change their status back to available. This dashboard is available in all commercial
Amazon GuardDuty is now available in AWS Asia Pacific (Malaysia) Region
16 January 2025 @ 6:00 pm
Amazon GuardDuty is now available in the Asia Pacific (Malaysia) Region. You can now use this additional Region to continuously monitor and detect anomalous behavior, security threats, and sophisticated multi-stage attack sequences targeting your AWS accounts to help protect your AWS accounts, workloads, and data. Tens of thousands of customers across many industries and geographies use GuardDuty. GuardDuty can identify unusual or unauthorized activity like cryptocurrency mining, access to data stored in Amazon Simple Storage Service (Amazon S3) from unusual locations, or unauthorized access to Amazon Elastic Kubernetes Service (Amazon EKS) clusters. GuardDuty Malware Protection adds file scanning for workloads using Amazon Elastic Block Store (Amazon EBS) volumes or Amazon S3 to detect the presence of malware. GuardDuty continually evolves its techniques to identify indicators of compromise, such as regularly
Start collaborating on multi-partner opportunities with Partner Connections
15 January 2025 @ 10:25 pm
Today, AWS Partner Central announces the general availability of Partner Connections, which allows AWS Partners to discover and connect with other Partners for collaboration on shared customer opportunities. With Partner Connections, Partners can co-sell joint solutions, accelerate deal progression, and expand their reach by teaming with other AWS Partners. At the core of Partner Connections are two key capabilities: connections discovery and multi-partner opportunities. The connections discovery feature uses AI-powered recommendations to streamline Partner matchmaking, making it easier for Partners to find suitable collaborators and add them to their network. With multi-partner opportunities, Partners can work together seamlessly to create and manage joint customer opportunities in APN Customer Engagements (ACE). This integrated approach allows Partners to work seamlessly with AWS and other Partners on shared opportunities, reducing the operational overhead of managing mul
networkworld.com
Information, intelligence and insight for Network and IT Executives.
Oracle updates Exadata systems to speed database operations
17 January 2025 @ 4:21 pm
If you had forgotten that Oracle was in the hardware business, it’s easy to understand why, as Oracle has not exactly promoted the business very well.
Oracle’s hardware is descended from Sun Microsystems servers, which Oracle acquired in 2010. Oracle has since shifted direction with the hardware, dumping its custom Sparc processors for x86 and tuning the hardware specifically to run Oracle software.
While hardware hasn’t been the focus, the company recently updated its Exadata platform, the Oracle Exadata X11M. The box is purpose-built to optimize the performance of Oracle Database for AI, OLTP, and analytics database performance in cloud, multi-cloud, and customer dat
Lenovo to acquire Infinidat to expand its storage folio
17 January 2025 @ 1:11 pm
Lenovo Group has entered into a definitive agreement to acquire Tel Aviv-based enterprise storage provider Infinidat, for an undisclosed sum, to expand its storage offerings.
The startup provides several offerings, such as InfiniBox, Infinibox SSA, InfiniGuard, and InfuzeOS.
While InfiniBox is a storage platform for mixed application workloads, Infinibox SSA is a storage platform for workloads that require intensive computing and microsecond latency along with other features such as high availability and cybersecurity.
InfuzeOS, on the other hand, is the software-defined storage architecture powering Infi
Biden’s clean AI infrastructure plan could be hanging by a thread
17 January 2025 @ 12:41 am
An executive order from outgoing US president Joe Biden aimed at advancing the nation’s leadership in AI infrastructure is “welcome and needed in theory, but this one seems rushed and somewhat at odds with the order just passed on AI chip export restrictions,” an analyst said Thursday.
Avivah Litan, distinguished VP analyst at Gartner, said, “these contradictions make me wonder why the rush with these orders when there is a new administration coming in next week? Who is pushing Biden to do this? What special interest groups are getting the President’s ea
SASE 2025: Impact grows despite adoption hurdles
16 January 2025 @ 9:41 pm
Secure access service edge technologies will garner a lot of attention in 2025, according to a recent survey, but despite the many benefits SASE promises, network and security leaders face an equal number of challenges in successfully implementing the technology.
Hughes Network Systems partnered with Cybersecurity Insiders to develop its 2025 Secure Network Access Report, which surveyed so
Nile dials-up AI to simplify network provisioning, operation
16 January 2025 @ 5:19 pm
Network-as-a-service startup Nile has added an AI-based tool aimed at helping enterprise customers provision and operate the vendor’s Campus Network-as-a-Service deployments.
Founded by former Cisco CEO John Chambers and Pankaj Patel, Cisco’s former chief development officer, Nile’s subscription-based NaaS offering, Nile Access Service, lets customers set up and manage campus network operations without requiring them to purchase and maintain their own networking infrastructure.
Nile Access Service includes a core package of wired and wireless campus infrastructure compo
Network convergence will drive enterprise 6G wireless strategies
16 January 2025 @ 1:32 pm
The traditional separation between Wi-Fi and cellular networks — a cornerstone of enterprise wireless planning — is facing fundamental challenges according to a new 6G vision statement released this week by the World Broadband Association,
“It is important that the 6G era brings together cellular, Wi-Fi, and non-terrestrial access in a more seamless fashion, to create a ‘network of networks,'” said Maria Cuevas Ramirez, network infrastructure research director at BT and a board director of the Wireless Broadband Alliance in a statement.
The three drivers for the convergence are cost pressures, user experience,
From Safety to Accountability: The Game-Changing Impact of Kazakhstan’s Surveillance System
16 January 2025 @ 4:49 am
Technology innovations have made the digital transformation of public services essential to enhancing safety, efficiency, and accountability. Kazakhstan has taken a monumental step forward in this regard by implementing a continuous video surveillance system across 78 correctional facilities nationwide. This groundbreaking initiative has set a new benchmark for prison management, significantly improving safety conditions and operational transparency.
A digital leap for safer prisons
In response to a national mandate from the President in 2020, the Ministry of Internal Affairs launched a comprehensive video survei
Qualcomm purloins Intel’s chief Xeon designer with eyes toward data center development
15 January 2025 @ 7:14 pm
If Intel was hoping for a turnaround in 2025, it will have to wait at least a little bit longer. The chief architect for Intel’s Xeon server processors has defected to chip rival Qualcomm, which is making yet another run at entering the data center market.
Sailesh Kottapalli, a 28-year Intel veteran and a senior fellow and chief architect for the company’s Xeon processors, made the announcement on LinkedIn on January 13, stating that he joined Qualcomm as a senior vice president.
“My journey took me through roles as a validation engineer, logic des
Cisco offers AI application visibility, access control, threat defense
15 January 2025 @ 5:43 pm
Cisco has rolled out a service that promises to protect enterprise AI development projects with visibility, access control, threat defense, and other safeguards.
The vendor’s AI Defense package offers protection to enterprise customers developing AI applications across models and cloud services, according to Tom Gillis, senior vice president and general manager of Cisco’s Security, Data Center, Internet & Cloud Infrastructure groups.
Vulnerabilities can occur at the model- or app-level, while responsibility for security lies with different owners including developers, end users, and vendors, Gillis said.
“Raising the stakes even more, when models fail, the
A CSO’s perspective: 8 cyber predictions for 2025
14 January 2025 @ 9:20 pm
As we step into 2025, the cyberthreat landscape is once again more dynamic and challenging than the year before. In 2024, we witnessed a remarkable acceleration in cyberattacks of all types, many fueled by advancements in generative AI. For security leaders, the stakes are higher than ever. In this post, I’ll explore cyberthreat projections and cybersecurity priorities for 2025. These predictions are not just forecasts—they’re calls to action to prepare for the challenges ahead and ensure businesses stay ahead of the threat curve.
Before diving in, let’s reflect on a few 2024 predictions that rang true, shaping lessons we carry forward into the new year.
Reflec
forensicswiki.org
Computer forensic tools and techniques used by investigators
cyberciti.biz
online community of new and seasoned Linux / Unix sysadmins.
Critical Rsync Vulnerability Requires Immediate Patching on Linux and Unix systems
15 January 2025 @ 6:04 pm
Rsync is a opensource command-line tool in Linux, macOS, *BSD and Unix-like systems that synchronizes files and directories. It is a popular tool for sending or receiving files, making backups, or setting up mirrors. It minimizes data copied by transferring only the changed parts of files, making it faster and more bandwidth-efficient than traditional copying methods provided by tools like sftp or ftp-ssl. Rsync versions 3.3.0 and below has been found with SIX serious vulnerabilities. Attackers could exploit these to leak your data, corrupt your files, or even take over your system. There is a heap-based buffer overflow with a CVSS score of 9.8 that needs to be addressed on both the client and server sides of rsync package. Apart from that info leak via uninitialized stack contents defeats ASLR protection and rsync server can make client write files outside of destination directory using symbolic links.
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How to control the SSH multiplexing with the control commands
15 January 2025 @ 8:29 am
Multiplexing will boost your SSH connectivity or speed by reusing existing TCP connections to a remote host. This is useful when you frequently connect to the same server using SSH protocol for remote login, server management, using IT automation tools over SSH or even running hourly backups. However, sometimes your SSH command (client) will not respond or get hung up on the session when using multiplexing. Typically, this happens when your public IP changes (IPv4 to IPv6 changes when using DNS names), VPN issues, or firewall cuts connections. Hence, knowing SSH client control commands can save you time and boost your productivity when such gotcZFS Raidz Expansion Finally, Here in version 2.3.0
14 January 2025 @ 9:19 am
After years of development and testing, the ZFS raidz expansion is finally here and has been released as part of version 2.3.0. ZFS is a popular file system for Linux and FreeBSD. RAIDz is like RAID 5, which you find with hardware or Linux software raid devices. It protects your data by spreading it across multiple hard disks along with parity information. A raidz device can have single, double, or triple parity to sustain one, two, or three hard disk failures, respectively, without losing any data. Hence, expanding or adding a new HDD is a very handy feature for sysadmins in today's data-sensitive apps.
Love this? sudo share_on: Twitter -
How to run Docker inside Incus containers
18 December 2024 @ 5:44 am
Incus and Docker both use Linux kernel features to containerize your applications. Incus is best suited when you need system-level containers that act like traditional VMs and provide a persistent developer experience. On the other hand, Docker containers are ephemeral, i.e., temporary in nature. All files created inside Docker containers are lost when your Docker container is stopped or removed unless you stored them using volumes in different directories outside Docker. Docker is created as a disposable app deployment system. Incus containers are not typically created as disposables, and data is kept inside MySQL Change root Password Command
9 December 2024 @ 4:19 pm
How do I change MySQL root password under Linux, FreeBSD, OpenBSD and UNIX-like like operating system over the ssh session?
Love this? sudo share_on: Twitter - Facebook - LinkHow to enable mouse to copy & paste in vim
28 November 2024 @ 1:44 pm
Some Linux distro like Debian or specific BSD variants provide very little configuration support for mouse out of the box for Vim. Let us see how to paste in Vim using a mouse by enabling support, which is useful for new developers and sysadmin coming from Windows background.
Love this? sudo share_on: Twitter - How to install vnstat on Debian 12/11 to monitor network interface bandwidth usage
27 November 2024 @ 7:07 pm
Do you need to keep track of the network traffic (bandwidth) usage for the Network interface controller (NIC) of your Debian Linux-based cloud or bare metal server? Look no forward. Try the vnStat, a free and open-source console-based network traffic monitor that keeps a log of 5-minute intervals, hourly, daily, monthly, and yearly network traffic for the selected interface. Once installed, vnStat can be used even without root permissions on most systems.
Love this? sudo share_on: How to find hard disk (SSD) serial numbers in Linux
16 November 2024 @ 9:38 pm
You need to use the smartctl command to display the hard disk (SSD) serial numbers in Linux. This is useful when changing your hard disk if it goes bad.
Love this? sudo share_on: Twitter - Facebook - How to install kvm-ok on Debian or Ubuntu Linux
16 November 2024 @ 6:54 am
The KVM-ok command command will tell you if your Debian or Ubuntu Linux-powered server can host hardware-accelerated KVM virtual machines. KVM (Kernel-based Virtual Machine) is a free and open-source virtualization technology that is used with every Linux kernel. In other words, KVM will make your Linux computer into a hypervisor, allowing you to run multiple isolated virtual machines (VMs) on a single physical machine. However, KVM depends upon CPU hardware virtualization extensions like Intel VT-x or AMD-V to provide high-performance virtual machines. This support must be enablzcommands: Read gzip Compressed Text Files On a Fly on Linux and Unix
1 November 2024 @ 8:34 pm
Linux and Unix like operating systems comes with z* commands. These commands allow you to read gzip compressed text files using zless, zcat, zmore, and friends commands. The gzip command reduces the size of the files using Lempel-Ziv coding (LZ77). Whenever possible, each file is replaced by one with the extension .gz while keeping the same ownership modes, access, and modification times. z* commands have some cool usage too, such as display the current time in different zonename.
Love this? sudo share_on: heartinternet.co.uk
Hosting packages for an initial web presence
Black Friday at Heart Internet
28 November 2024 @ 3:27 pm
Black Friday is here, and we’re bringing you incredible savings to help your business thrive online. From 29th November 2024 to 9th December 2024, you can enjoy 15% off some of our most popular products to get the tools you need at a fraction of the cost. What’s on Offer? Here’s what you can save [read more...]
13 Easy Ways to Optimise Your Website for Speed and Performance
1 October 2024 @ 2:53 pm
A slow website is like a slow waiter: it doesn’t matter how good the food is if the service is frustratingly sluggish. If your site takes too long to load, visitors are likely to abandon it faster than you can say “bounce rate.” But fear not! Here are some tips to help you optimise your [read more...]
Black Friday and Cyber Monday sale now on at Heart Internet
22 November 2022 @ 3:31 pm
You can now get up to 33% off the price of a cPanel-managed Web Hosting plan at Heart Internet.
Are your website fonts sending the right message?
3 November 2022 @ 10:18 am
Did you know that the fonts you use on your website can impact the way your customers perceive and interact with your brand?
10 of the best WooCommerce plugins
27 October 2022 @ 10:53 am
Including options for optimising your cart, boosting customer loyalty, and selling tickets.
9 creative alternatives to .com and .co.uk domains
5 October 2022 @ 2:37 pm
Discover the appeal of .ninja, .coffee, .guru and more - all available in our domain name sale.
Save up to 43% on WordPress Hosting in our latest sale
20 September 2022 @ 3:23 pm
We’ve just slashed the price of WordPress Hosting at Heart Internet.
What to do once you’ve bought a domain
7 September 2022 @ 12:48 pm
A guide to what to do next once you've chosen your perfect domain name.
Empowering quotes and motivational tips for entrepreneurs
25 August 2022 @ 8:33 am
Including quotes from Amelia Earhart and Barack Obama, to give you a little pick me up.
5 reasons we love cPanel
10 August 2022 @ 7:09 am
When browsing through hosting packages, you’ll often come across the word cPanel. But what exactly does this word mean and what are the benefits of buying a hosting package with cPanel included?
serverfault.com
Common Server issues – FAQs and answers from those in the know
Where are PHP8 syntax error logged?
18 January 2025 @ 3:08 am
I installed LEMP with PHP8 on Ubuntu 24.04 and was able to host a WordPress website.
The only thing I can't figure out is where PHP errors are logged.
For example I created a PHP page with an error:
<?php
phpinfo1();
?>
when I open this page browser displays this:
no error messages appear in /var/log/php8.3-fpm.log.
I added
error_log = /var/log/php8-error-log.log
to /etc/php/8.3/fpm/php.ini:
resta
no error messages appear in /var/log/php8.3-fpm.log.
I added
error_log = /var/log/php8-error-log.log
to /etc/php/8.3/fpm/php.ini:
restaHow Does One Service Authenticate To Another Using Kerberos?
18 January 2025 @ 12:28 am
How can one service authenticate to another that's registered in Kerberos? In my case, both are owned by different service accounts, so they can't run kinit like an ordinary user can. So when one service wants something from the other, how does it get a Kerberos ticket without a TGT (ticket granting ticket)?
To be more specific, I run an Apache web server to provide access to Subversion repositories. Its service account and SPN (Service Principal Name) are registered in Kerberos. I also run a Jenkins server that sometimes needs to checkout those repositories. Ordinary users can authenticate to both servers: to Apache only after running kinit, and to Jenkins over LDAP. How does the Jenkins service account authenticate to Apache to access a Subversion repository since it can't run kinit?
This sounds similar but without a good answer. And
iPhone won't load sites on private LAN
17 January 2025 @ 11:55 pm
I'm running a private network and on that network is a website. We're using DNSMasq to hand out addresses, and handle routing. All of that works just fine, for desktop users.
The private LAN doesn't have any internet access, and internet access isn't an option.
Desktop users can join the wifi network and load the website just fine. It's a simple html site, not using ssl or anything, just running on port 80.
However, iPhones can't load the site. Oddly, iPads CAN load the site.
iPhones seem to get hung up on the fact that the network doesn't have internet access and just pretend the network doesn't exist. They're getting an ip address from the DHCP server, I've confirmed that, but they won't connect to anything on the network after that.
Is there a way to get iPhones to engage with devices on a network that doesn't have internet access?
Screenshot of iOS wi
Ubuntu 22.04 - Install MySQL 5.7 - Automate Script
17 January 2025 @ 11:54 pm
I'm working on a legacy platform that we're automating the deploy. It will require multiple iterations until it gets to the point that we use in production. Right now, I'm in the step of setting up and configuring the basic MySQL 5.7.
Environment
Ubuntu 22.04
AWS
At this stage, it's a script Bash Script that we run locally and it configures everything in the remote server. Later, we'll convert to GitHub actions and this strategy has worked in the past for us, so let's stick to the initial architecture.
This is the working proof-of-concept that I ran manually in the server and worked perfectly:
# Firewall configuration.
sudo ufw allow 3306/tcp;
sudo wget https://dev.mysql.com/get/mysql-apt-config_0.8.12-1_all.deb;
echo "mysql-apt-config mysql-apt-config/select-server select mysql-5.7" | sudo debconf-set-selections;
echo "mysql-apt-config mysql-apt-config/select-p
Take bsod on Celcius Fujitsu R920 Power by Graphic's Card driver
17 January 2025 @ 9:22 pm
I bought a Fujitsu Celsius R920 Power last week, and i installed windows 11 on it. My graphics card (Nvidia Geforce 8800 GTS 512) and it's driver complaint, I get bsod and problem with nvlddmkm.sys. ( https://answers.microsoft.com/en-us/windows/forum/all/im-getting-bsod-with-error-nvlddmkmsys/eee6bed4-c3a6-48c9-a182-9f55bfba902b#?page=5 )
I am thinking to add a newer card as Nvidio reports that for the sserver's supported card is not going to support them, by upgrading the driver's. Does any use any newer card (DDR3 at 4gb ram) without any problem?
( https://www.bestprice.gr/item/2156215313/biostar-geforce-gt-730-4gb-gddr3-karta-grafikwn.html )
why is our network printer printing unrequested gibberish pages?
17 January 2025 @ 8:45 pm
For at least a year now, the network printer in my office has randomly spewed out pages of gibberish. Or at least most of it is gibberish - some of it looks like HTTP requests. It's formatted in the way that the printer does when you send it a text file with no styling information. These pages get printed at any time of the day, sometimes in the wee hours of the morning, sometimes late at night. We are mystified as to the cause, and I'm concerned that it might be a security issue of some sort. I've included a photo of some of the pages that it printed. The number of pages is rather sporadic, sometimes one or two a day, sometimes 30 or 40. Any ideas?
Addendum: I briefly worked at two other locations in our organization that had this issue. One other that didn't. Each locat
Addendum: I briefly worked at two other locations in our organization that had this issue. One other that didn't. Each locatPut a client to a queue instead of passing IIS 503 web error to him
17 January 2025 @ 8:14 pm
I have HAProxy and 2 backend IIS web servers. When one of the main IIS app polls on one of these servers goes down, then IIS responds me with 503 error. If the client has session persistence on such a server he can see this 503 error which isn't very nice.
I am looking for any way how to avoid this scenario. Let me clarify some things:
HAProxy is unable to do something with it. I already lowered my timeout connection and health check values to minimum and I can't go lower. Still there is this minimum time window when a client can get 503 error from IIS because HAProxy still see the backend server as healthy so it passes the 503 response.
One thing that maybe can be done is to rewrite the error on haproxy when IIS return 503 to another custom error. However this is not a solution, it's just replacement of an error by another error.
I was thinking about some process when HAProxy can put a user to queue when it receives 503 error from an IIS backen
Mark reply packets with same as incoming packets with nftables
17 January 2025 @ 4:15 pm
Before
We have a server which is also a vpn client.
It has so 2 interfaces: eth0 (physical) and tun0 (vpn)
The vpn is only there to serve external requests: it goes to another site which directs public internet requests to the server via the vpn.
** Both sides access with the local ip of the server
Target
Currently, the server openvpn option redirects-gateway is set.
However we would like the server default route to be the local gateway and not the vpn.
** Using simple iproute src rule is not possible as the server is accessible through the VPN via the internal and vps interface address **
Currently tried
So we removed the redirect-gateway option.
However, the requests from the vpn from public address queries replies do not go through the vpn.
Rightly so since default route to internet clients is via the gateway and not the vpn (anymore).
So we need to mark incoming packets from the vpn, and ensure that the reply packets are rou
Diagnosing Processes Stalling on High-Performance Server
17 January 2025 @ 2:53 pm
I am troubleshooting an issue on a high-performance server which is used for deep learning, where processes intermittently stall during heavy workloads. The server specs and relevant details are as follows:
Configuration:
CPUs: 2 sockets, 32 cores per socket, 2 threads per core (64 logical CPUs per NUMA node, total 128 logical CPUs).
Memory: ~500GB RAM split across two NUMA nodes (each node has ~250GB).
Disk space: 12 TB SSD
Swap: 8GB (frequently fullm not only during stalling).
GPUs: 4 Nvidia A100 with 80 GB each
OS: Ubuntu 22
We are manually using taskset and an excel file to prevent sharing CPUs between processes
For application of the models we use pytorch with cuda drivers for the GPU
The Problem:
During training, validation or application of large machine learning models on up to gigapixel images (>4GB), processes sometimes stall, meaning no more progress
W
Soft interrupts are still concentrated on a single core after enabling RPS (Receive Packet Steering) and RFS (Receive Flow Steering)
17 January 2025 @ 2:05 pm
I'm doing an HTTP performance test on my centos7 VM(4 cores 2GB). I use wrk to generate HTTP traffic on this VM.
During my test, I found the soft interrupts are concentrated on one sigle core, so I try to enable RPS and RFS to make soft interruptes load balance. But top shows it doesn't work:
[root@centos7 ~]# top
top - 16:15:38 up 6:28, 3 users, load average: 1.78, 1.95, 1.86
Tasks: 119 total, 3 running, 116 sleeping, 0 stopped, 0 zombie
%Cpu0 : 0.0 us, 3.0 sy, 0.0 ni, 3.0 id, 0.0 wa, 0.0 hi, 93.9 si, 0.0 st
%Cpu1 : 0.0 us, 12.9 sy, 0.0 ni, 74.2 id, 0.0 wa, 0.0 hi, 12.9 si, 0.0 st
%Cpu2 : 3.1 us, 15.6 sy, 0.0 ni, 68.8 id, 0.0 wa, 0.0 hi, 12.5 si, 0.0 st
%Cpu3 : 0.0 us, 13.3 sy, 0.0 ni, 73.3 id, 0.0 wa, 0.0 hi, 13.3 si, 0.0 st
KiB Mem : 1863028 total, 1168228 free, 206960 used, 487840 buff/cache
KiB Swap: 0 total, 0 free, 0 used. 1460180 avail Mem
PID USER PR NI
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