How to identify shell builtins, aliases and executable files on Linux systems

Shell builtins are commands that are loaded into memory when a shell — such as bash, sh, or zsh — is invoked. The reason for this is that keeping these commands in memory helps ensure that these commands will be run very efficiently whenever someone uses them. They run faster because they don't have to first be loaded into memory. They're "built in."Determining whether commands that you use are builtins, aliases, or executable files on your system that are loaded as needed requires the use of several interesting commands. These include type, which, and compgen. So, let's take a look at how these commands work and what they can tell us.To read this article in full, please click here

How to identify shell builtins, aliases and executable files on Linux systems

Shell builtins are commands that are loaded into memory when a shell — such as bash, sh, or zsh — is invoked. The reason for this is that keeping these commands in memory helps ensure that these commands will be run very efficiently whenever someone uses them. They run faster because they don't have to first be loaded into memory. They're "built in."Determining whether commands that you use are builtins, aliases, or executable files on your system that are loaded as needed requires the use of several interesting commands. These include type, which, and compgen. So, let's take a look at how these commands work and what they can tell us.To read this article in full, please click here

BGP: What is it, how can it break, and can Linux BGP fix it?

Border Gateway Protocol (BGP) is one of the most important protocols on the internet. At the same time, when it breaks, it is one of the most potentially catastrophic.

As the internet grows ever larger and becomes ever more complex, having a well-configured BGP is crucial to keeping everything running smoothly. Unfortunately, when a BGP is not configured correctly, there can be disastrous consequences.

This blog will provide a brief explanation of what BGP is, and then dive into some of the common protocol issues and pitfalls. We cannot go too deep into the intricacies of BGP – those can (and do) fill entire books. However, we can provide an overview of how Linux (which has a standardized BGP protocol set and in-depth monitoring, analysis, and control tools) can be used to alleviate some of these common issues.

What is BGP?

BGP is a routing protocol that relies on TCP, designed for providing routing information in and between autonomous systems (ASes). In large networks, BGP is responsible for informing all hosts that need to know of the ways a packet can travel from site A to site B – and, if a site or router goes down, how to reroute the packet so Continue reading

Cisco warns on HyperFlex security vulnerabilities

Cisco this week identified two “High” security vulnerabilities in its HyperFlex data-center package that could let attackers gain control of the system.  HyperFlex is Cisco’s hyperconverged infrastructure that offers computing, networking and storage resources in a single system. More about edge networking How edge networking and IoT will reshape data centers Edge computing best practices How edge computing can help secure the IoT The more critical of the two warnings – an 8.8 on Cisco’s severity scale of 1-10 – is a command-injection vulnerability in the cluster service manager of Cisco HyperFlex Software that could let an unauthenticated, attacker execute commands as the root user.To read this article in full, please click here

Cisco warns on HyperFlex security vulnerabilities

Cisco this week identified two “High” security vulnerabilities in its HyperFlex data-center package that could let attackers gain control of the system.  HyperFlex is Cisco’s hyperconverged infrastructure that offers computing, networking and storage resources in a single system. More about edge networking How edge networking and IoT will reshape data centers Edge computing best practices How edge computing can help secure the IoT The more critical of the two warnings – an 8.8 on Cisco’s severity scale of 1-10 – is a command-injection vulnerability in the cluster service manager of Cisco HyperFlex Software that could let an unauthenticated, attacker execute commands as the root user.To read this article in full, please click here

Cisco warns on HyperFlex security vulnerabilities

Cisco this week identified two “High” security vulnerabilities in its HyperFlex data-center package that could let attackers gain control of the system.  HyperFlex is Cisco’s hyperconverged infrastructure that offers computing, networking and storage resources in a single system. More about edge networking How edge networking and IoT will reshape data centers Edge computing best practices How edge computing can help secure the IoT The more critical of the two warnings – an 8.8 on Cisco’s severity scale of 1-10 – is a command-injection vulnerability in the cluster service manager of Cisco HyperFlex Software that could let an unauthenticated, attacker execute commands as the root user.To read this article in full, please click here

Cisco warns on HyperFlex security vulnerabilities

Cisco this week identified two “High” security vulnerabilities in its HyperFlex data-center package that could let attackers gain control of the system.  HyperFlex is Cisco’s hyperconverged infrastructure that offers computing, networking and storage resources in a single system. More about edge networking How edge networking and IoT will reshape data centers Edge computing best practices How edge computing can help secure the IoT The more critical of the two warnings – an 8.8 on Cisco’s severity scale of 1-10 – is a command-injection vulnerability in the cluster service manager of Cisco HyperFlex Software that could let an unauthenticated, attacker execute commands as the root user.To read this article in full, please click here

Cisco warns on HyperFlex security vulnerabilities

Cisco this week identified two “High” security vulnerabilities in its HyperFlex data-center package that could let attackers gain control of the system.  HyperFlex is Cisco’s hyperconverged infrastructure that offers computing, networking and storage resources in a single system. More about edge networking How edge networking and IoT will reshape data centers Edge computing best practices How edge computing can help secure the IoT The more critical of the two warnings – an 8.8 on Cisco’s severity scale of 1-10 – is a command-injection vulnerability in the cluster service manager of Cisco HyperFlex Software that could let an unauthenticated, attacker execute commands as the root user.To read this article in full, please click here

Cisco warns on HyperFlex security vulnerabilities

Cisco this week identified two “High” security vulnerabilities in its HyperFlex data-center package that could let attackers gain control of the system.  HyperFlex is Cisco’s hyperconverged infrastructure that offers computing, networking and storage resources in a single system. More about edge networking How edge networking and IoT will reshape data centers Edge computing best practices How edge computing can help secure the IoT The more critical of the two warnings – an 8.8 on Cisco’s severity scale of 1-10 – is a command-injection vulnerability in the cluster service manager of Cisco HyperFlex Software that could let an unauthenticated, attacker execute commands as the root user.To read this article in full, please click here

Cisco warns on HyperFlex security vulnerabilities

Cisco this week identified two “High” security vulnerabilities in its HyperFlex data-center package that could let attackers gain control of the system.  HyperFlex is Cisco’s hyperconverged infrastructure that offers computing, networking and storage resources in a single system. More about edge networking How edge networking and IoT will reshape data centers Edge computing best practices How edge computing can help secure the IoT The more critical of the two warnings – an 8.8 on Cisco’s severity scale of 1-10 – is a command-injection vulnerability in the cluster service manager of Cisco HyperFlex Software that could let an unauthenticated, attacker execute commands as the root user.To read this article in full, please click here

No!

What part of "no" doesn't the DNS understand? We look at over-query rates in the DNS when we try to resolve a non-existent name.

Interview with Juniper Networks Ambassador Said van de Klundert

Had a chance to sit down with Netherlands-based Fellow Juniper Networks Ambassador Said van de Klundert (JNCIE-SP #2573 and JNCIE-DC #26) at the Juniper NXTWORK 2018 conference in Las Vegas. Said is an incredibly knowledgeable network engineer, content developer and blogger, with a wealth of practical experience in the Service Provider, Data Center and Cloud …

Continue reading "Interview with Juniper Networks Ambassador Said van de Klundert"

HP’s President’s Day Sale Continues With up to 56% off Select Products – Deal Alert

In honor of President's Day, HP's online store has slashed prices up to 56% on various items, with free shipping included. On the list is the HP Pavilion Laptop - 15T which has been discounted $420 down to $579.99.  The budget-friendly 14z laptop is even budget-friendlier at just $189.99, down from $329.99. The HP Probook 640 G4 Notebook PC is slashed 53% from $1310 to just $609. There are many more discounts as well, so browse the full list of deals at HP's online store right here.To read this article in full, please click here

HP’s President’s Day Sale Continues With up to 56% off Select Products – Deal Alert

In honor of President's Day, HP's online store has slashed prices up to 56% on various items, with free shipping included. On the list is the HP Pavilion Laptop - 15T which has been discounted $420 down to $579.99.  The budget-friendly 14z laptop is even budget-friendlier at just $189.99, down from $329.99. The HP Probook 640 G4 Notebook PC is slashed 53% from $1310 to just $609. There are many more discounts as well, so browse the full list of deals at HP's online store right here.To read this article in full, please click here

1 … 1,263 1,264 1,265 1,266 1,267 … 3,797