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Repeating commands on Linux with or without changes

Life on the command line on Linux is clearly something most of us enjoy, but typing the same command again and again can become tiresome. To avoid that boredom, this post explains a number of ways that you can make repeating commands – or repeating commands but with some changes – a lot easier than you might expect.Rerunning the previous command First, the easiest way to repeat a command is simply by typing !!. If you were logged into a Linux server and waiting for a coworker to log in, for example, you might want to repeat the who command shown below until you see your coworker’s username. Typing !! after the initial who command will do this for you.To read this article in full, please click here

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Repeating commands on Linux with or without changes

Life on the command line on Linux is clearly something most of us enjoy, but typing the same command again and again can become tiresome. To avoid that boredom, this post explains a number of ways that you can make repeating commands – or repeating commands but with some changes – a lot easier than you might expect.Rerunning the previous command First, the easiest way to repeat a command is simply by typing !!. If you were logged into a Linux server and waiting for a coworker to log in, for example, you might want to repeat the who command shown below until you see your coworker’s username. Typing !! after the initial who command will do this for you.To read this article in full, please click here

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Network RPA Compliance and Security Use Cases: Gluware LiveStream June 28, 2022 (6/7) – Video

The Gluware application suite that includes Device Manager, Config Drift and Audit, OS Manager and Config Modeling provide no-code automation to enable and maintain compliance and enhance security. Now, Network RPA enables defining automated end-to-end processes that ensure policies and procedures are executed manually, scheduled or event-driven providing continuous compliance and improved security posture. Host […]

The post Network RPA Compliance and Security Use Cases: Gluware LiveStream June 28, 2022 (6/7) – Video appeared first on Packet Pushers.

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Using Default AWS Resources with Pulumi

Per the AWS documentation (although I’m sure there are exceptions), when you start using AWS you are given some automatically-created resources: a default VPC that contains public subnets in each availability zone in the region along with an Internet gateway and settings to enable DNS resolution. Most of the infrastructure-as-code tutorials that I’ve seen start with creating a VPC and subnets and gateway, but what if you wanted to use these default resources instead? I wasn’t really able to find a good walkthrough on how to do this, so this post provides some sample Go code you can use with Pulumi to identify these default AWS resources and use them.

I’ll approach this from the perspective of wanting to launch an EC2 instance in the default infrastructure that AWS provides for you in a region. To launch an EC2 instance using Pulumi (and most other infrastructure-as-code tools), there are several pieces of information you need:

1. An AMI ID
2. The instance type
3. The name of an SSH keypair that’s been uploaded to/created in AWS
4. A subnet ID
5. A security group ID

The first three are probably things you’ll want to parameterize (i.e., make it possible for you to pass Continue reading

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ClickHouse SF Bay Area Meetup: Akvorado

Here are the slides I presented for a ClickHouse SF Bay Area Meetup in July 2022, hosted by Altinity. They are about Akvorado, a network flow collector and visualizer, and notably on how it relies on ClickHouse, a column-oriented database.

The meetup was recorded and available on YouTube. Here is the part relevant to my presentation, with subtitles:¹

I got a few questions about how to get information from the higher layers, like HTTP. As my use case for Akvorado was at the network edge, my answers were mostly negative. However, as sFlow is extensible, when collecting flows from Linux servers instead, you could embed additional data and they could be exported as well.

I also got a question about doing aggregation in a single table. ClickHouse can aggregate automatically data using TTL. My answer for not doing that is partial. There is another reason: the retention periods of the various tables may overlap. For example, the main table keeps data for 15 days, but even in these 15 days, if I do a query on a 12-hour window, it is faster to use the flows_1m0s aggregated table, unless I request something about Continue reading

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How to Find Skilled Network Operations Talent in a Tight Labor Market

Network operations experts are in extremely short supply. Addressing the challenge requires perseverance, flexibility, and a hefty dose of realism.

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Day Two Cloud 156: Multi-Cloud Experience Monitoring With Broadcom Software (Sponsored)

It's hard to guarantee quality of experience for users accessing cloud applications. The users are connected via networks we don’t own, and the apps are hosted on networks we don’t own. So what can a network operations team do about quality of experience in a world of cloud-hosted apps and cloud-connected users? Sponsor Broadcom Software is here to help us answer this question.

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Strong-Armed Into HPC, Like It Or Not

If you are an HPC center in Europe, and particularly one that is funded by public funds, you are thinking about Arm-based CPUs in your supercomputers. …

Strong-Armed Into HPC, Like It Or Not was written by Timothy Prickett Morgan at The Next Platform.

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IBM bolsters quantum cryptography for z16 mainframe

While the need for it may be years away, IBM has added additional mainframe protection against future quantum-based security attacks.When Big Blue rolled out the newest iteration of its mainframe – the z16—in April, one of its core design pillars was a promise to protect organizations from anticipated quantum-based security threats. Specifically, the z16 supports the Crypto Express8S adapter to deliver quantum-safe APIs that will let enterprises start developing quantum-safe cryptography along with classical cryptography and to modernize existing applications and build new applications, IBM stated.To read this article in full, please click here

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IBM bolsters quantum cryptography for z16 mainframe

While the need for it may be years away, IBM has added additional mainframe protection against future quantum-based security attacks.When Big Blue rolled out the newest iteration of its mainframe – the z16—in April, one of its core design pillars was a promise to protect organizations from anticipated quantum-based security threats. Specifically, the z16 supports the Crypto Express8S adapter to deliver quantum-safe APIs that will let enterprises start developing quantum-safe cryptography along with classical cryptography and to modernize existing applications and build new applications, IBM stated.To read this article in full, please click here

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IBM bolsters quantum cryptography for z16 mainframe

While the need for it may be years away, IBM has added additional mainframe protection against future quantum-based security attacks.When Big Blue rolled out the newest iteration of its mainframe – the z16—in April, one of its core design pillars was a promise to protect organizations from anticipated quantum-based security threats. Specifically, the z16 supports the Crypto Express8S adapter to deliver quantum-safe APIs that will let enterprises start developing quantum-safe cryptography along with classical cryptography and to modernize existing applications and build new applications, IBM stated.To read this article in full, please click here

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IBM bolsters quantum cryptography for z16 mainframe

While the need for it may be years away, IBM has added additional mainframe protection against future quantum-based security attacks.When Big Blue rolled out the newest iteration of its mainframe – the z16—in April, one of its core design pillars was a promise to protect organizations from anticipated quantum-based security threats. Specifically, the z16 supports the Crypto Express8S adapter to deliver quantum-safe APIs that will let enterprises start developing quantum-safe cryptography along with classical cryptography and to modernize existing applications and build new applications, IBM stated.To read this article in full, please click here

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Privacy And Networking Part 5: The Data Lifecycle

In the previous posts in this series, I concluded that privacy is everyone’s responsibility, that IP addresses (and a lot of other information network engineers handle) are protected information, and while processing packets probably doesn’t trigger any privacy warnings, network logging should and does. In this post, I want to start answering the question—okay, what […]

The post Privacy And Networking Part 5: The Data Lifecycle appeared first on Packet Pushers.

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Atos Notches Up Another Win With “Pegaso” Supercomputer At Petrobras

Atos, for a long time a key IT services provider in Europe, stepped onto the HPC stage in a big way in 2014 when it bought systems maker Bull’s hardware business in $840 million, instantly making it a major supercomputer vendor on the continent. …

Atos Notches Up Another Win With “Pegaso” Supercomputer At Petrobras was written by Jeffrey Burt at The Next Platform.

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Twilight Zone: File Transfer Never Completes

Ages ago when we were building networks using super-expensive 64kbps WAN links, a customer sent us a weird bug report:

Everything works fine, but we cannot transfer one particular file between two locations – the file transfer stalls and eventually times out. At the same time, we’re seeing increased number of CRC errors on the WAN link.

My chat with the engineer handling the ticket went along these lines:

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Twilight Zone: File Transfer Never Completes

Ages ago when we were building networks using super-expensive 64kbps WAN links, a customer sent us a weird bug report:

Everything works fine, but we cannot transfer one particular file between two locations – the file transfer stalls and eventually times out. At the same time, we’re seeing increased number of CRC errors on the WAN link.

My chat with the engineer handling the ticket went along these lines:

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An Overview Of Cisco’s SecureX Device Insights

Device Insights, a feature of Cisco's SecureX XDR service, aggregates, normalizes, and visualizes esssential details about all the devices on your network. SecureX can also automate workflows to respond to device-level security problems.

The post An Overview Of Cisco’s SecureX Device Insights appeared first on Packet Pushers.

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IBM Uses Power10 CPU As An I/O Switch

Back in early July, we covered the launch of IBM’s entry and midrange Power10 systems and mused about how Big Blue could use these systems to reinvigorate an HPC business rather than just satisfy the needs of the enterprise customers who run transaction processing systems and are looking to add AI inference to their applications through matrix math units on the Power10 chip. …

IBM Uses Power10 CPU As An I/O Switch was written by Timothy Prickett Morgan at The Next Platform.

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Getting started with container security

A couple of days ago, I was checking my Twitter feed and saw a tweet from someone saying how frustrated he was that DockerHub (a renowned container registry) was down. Someone else replied to the tweet, recommending the tweet’s author to check out Google’s repository, where they have DockerHub mirrors in Google Cloud.

My first reaction was “Nice! How clever of this person (or Google) to have thought of this idea.” My next thought was, wait. This could lead to potential security risks for some developers who are not familiar with how these registries are updated and what images go into these mirrored sites. Imagine when application developers are busy scrambling to check-in their latest update to the CI/CD pipeline of the software they are building, and in that time crunch, their go-to container registry is down. Do developers really have the time to check if there are vulnerable images in every registry they use? Will there be an easy, streamlined way to automatically scan the images no matter which registry developers use to pull their images? The short answer is yes, and we will look into that in this blog.

Scan all your container assets with Calico Cloud

Continue reading

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In a Digital World, Anti-Fraud and Security Teams Should be Partners

Sharing the right information at the right time is critical to extraordinary digital experiences and protecting customers and the business from fraud.