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Category Archives: Technology

Avoid creating an event storm when using social outputs with Fluentd

14 Thursday Apr 2022

Posted by mp3monster in Fluentd, General, Technology

≈ Leave a comment

Tags

Fluentd, logging, mail storm, monitoring, Plugin, social, supress

Fluentd has an incredible catalogue of plugins including notification and collaboration channels from good old-fashioned email through to slack, teams, and others.

The thing to remember if you use these channels is that if you’re sending errors, from application logs it isn’t unusual for there to be multiple error events as a root event can cause a cascade of related issues. For example, if your code is writing transactions to a database and the database goes down with no failover mechanism, then your code will most likely experience an error, roll back the transaction perhaps to some sort of queue, and then try to process the next event. Which will again fail. This is the classic situation where multiple errors will get reported for the same issue. This problem is often referred to as a mail storm given that there was a time when we didn’t have social collaboration tools and everyone used email.

There are several ways to overcome this problem. But the most simple and elegant of these is using the suppress plugin in its filter mode.

<filter **>
  @type suppress
  interval 60       # period in seconds when the condition to supress is triggered
  num 2             # number of occurences of a value before suppressing
  attr_keys source  # the element of the event to consider.
</filter>

In this example if we encounter an event with an attribute called source containing the same value twice then the suppression will kick in for 60 seconds. If you want the key to the valuebeing checked to be the tag then simply omit the attr_keys parameter.

Of course, we don’t want the suppression to kick in if the same value in the attribute keys occured once every few hours. To address this the occurence count is applied over not a time period, but a number of events received by the configuration of max_slot_num which defaults to 10k, but resets

In the filter mode, this plugin is best positionbed immediately before the match block. This means we don’t accidentally suppress messages before they are routed anywhere else.

For the purposes of a demo this is less of an issue. But for a realworld use case would probably benefit from some tuning. All the documentation for this plugin is at https://github.com/fujiwara/fluent-plugin-suppress

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Knowledge Resources from Oracle

05 Tuesday Apr 2022

Posted by mp3monster in Cloud, General, Oracle, Technology

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Tags

documentation, knowledge, Oracle, resources

Before joining Oracle I used to typically refer to a couple of key resources from Oracle – docs.oracle.com, and occasionally developer.oracle.com and ateam-oracle.com. We’d obviously use cloud.oracle.com and the main oracle.com to be able to reference published stats, success references etc. Now I’m part of the company and working in the OCI product team with an outbound side of things, I needed to gem up on all the assets that exist. So that we can help contribute, and ensure that they are up to date etc. In doing so, the number of resources available is so much more than I’d realized.

Upon reflection, this may have been from the fact we didn’t drill down deeply enough, also in part that Capgemini has its own approaches and strategies as well.

This in part is linked to the organizational structures e.g. OCI Product Management’s outbound work overlaps with the Marketing Developer Relations, for example, something that is inevitable in an organization that provides such a diverse portfolio of products.

For my own benefit, and for others to exploit, the following table summarises the different areas of information. The nature of the content and – where content overlaps or is presented in different ways.

We’ve moved this content so it can be easily revised to here (and accessible from the site menu). But also available here …

Domain AddressDescription
oracle.comThis is the commercial side of the Oracle content. But includes a landing page for a lot of Oracle knowledge/documentation.
docs.oracle.comThe home of the core Oracle documentation for all products.
blogs.oracle.comOracle blogs primarily from Oracle staff covering different parts of the organization, covering employment diversity through to each of the major product families, domain verticals such as Retail, Hospitality. The blogs are broken into groups, so it’s worth bookmarking the product groups of interest, for example, Infrastructure.
In addition to the product spaces, there are blogs that come from teams such as the A-Team – Infrastructure, Java Magazine,
A-TeamThe members of this team are the ‘gurus’ of product application. These cover a range of domains – structured in a similar way to blogs.oracle.com with different posts. These posts represent patterns and solutions to problems encountered by the team. How to, or not to implement things.
This can overlap with some blogs in so far as both product blogs and A-Team blogs may address how to leverage product features.
developer.oracle.comDeveloper relations lead, which covers not only Oracle products but also the application of open source. By its very name, there is a strong emphasis on coding (rather than low-code) covering not just Java, but .Net languages such as C#, Node, JavaScript, and so on.
There is some content overlap here with the Architectural Center, where Architecture Centre provides reference solutions.
docs.oracle.com/solutions
(AKA Architecture Center)
This is the Architecture Center which provides reference solutions. But these aren’t exclusive to the SaaS products (which would be easy to interpret). A lot of examples cover deploying and running open-source solutions on IaaS, for example, Drupal, WordPress, and Magento to name just a couple. A lot of these are backed up with scripts, Terraform, and code to achieve the deployment and configuration.
In addition to this, there are use cases of what customers have deployed into production (known as built and deployed).
docs.oracle.com/learn/This contains a lot of free tutorials and labs that can be taken a run to implement different things, from deploying a Python with Flask solution on Kubernetes to Creating USB Installation Media for Oracle Linux with Fedora Media Writer. As you can see from these examples, the tutorials cover both Oracle products and open source.
These resources interlink with the Architecture Centre and can overlap with developer.oracle.com.
github.com/oracle-devrelThis contains the code artifacts developed by Developer Relations and the Architecture Center team. So covers Reference Architectures, tutorials, and Live Labs all freely available to use.
github.com/oracle-samplesThis repository contains example solutions and Terraform logic developed by groups such as the A-Team.
opensource.oracle.comThis provides a catalog of links to the various open-source repositories available. This includes oracle-sample and devrel but also the many other projects including, but not limited to Helidon, Fn, Verrrazano, GraalVM, Apiary
community.oracle.com/hubThis is where a lot of the Q&A for Oracle Partners and users takes place. Community participation is gamified to encourage participation.
academy.oracle.comThis is really for the educational community (Universities, Colleges & Schools) and provides resources to take you from zero to certified skills for Java and Oracle Database.
education.oracle.comPrimarily for the formal Oracle certification resources, but there are some free training resources here as well.
apex.oracle.comAPEX has its own area of dedicated resources. This includes solutions, templates, and other development resources, and community.
github.com/oracleThis is the home for the majority of all Oracle free code, including the Open source projects such as Helidon, JET, Kubernetes Operators, and so on.
Helidon, Fn, and other source projectsA number of Oracle open source projects have their own independent web resources as well. Helidon includes additional technical resources.
The ones we know more about are :
Helidon, Fn, Verrrazano, GraalVM, Apiary
Bit it includes references to Java core language etc.
www.youtube.com/oracleYouTube training videos. With multiple channels based on different technologies.
Java (OpenJDK and Oracle JDK)Oracle propel not just their main JDK /JRE which has license constraints, but also Open JDK. With this comes a dedicated Developer zone as dev.java.
PaaS CommunityManaged by Jurgen Kress (Prod Mgr for Oracle PaaS). It acts as an aggregator for contributions from the community and shares news about what is happening within Oracle to support customers and partners in the PaaS space.
Developer CommunityPartner site to the PaaS Community with a focus on more development activities around Weblogic, Helidon, etc.
Oracle PodcastsPerhaps not access usable as documentation, how-to, etc. but Podcasts can yield a lot of broad picture insights. Oracle has a range of podcasts covering a diverse range of subjects. Not all podcasts are active at any one time. But the site provides a catalog and episode list.

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gRPC, GraphQL and more …

01 Tuesday Mar 2022

Posted by mp3monster in APIs & microservices, General, Technology

≈ Leave a comment

Tags

API, GraphQL, gRPC, REST

I got into a discussion with several people about the use of GraphQL and related API technologies and discovered that a presentation I’ve been using and evolving for a while now, didn’t appear in my blog. So here is a version of it used at an API Conference …

gRPC, GraphQL, REST – Which API Tech to use – API Conference Berlin oct 20 from Phil Wilkins

The presentation may appear again in the future as the perspective of API technologies evolves the presentation will need to evolve. For example, AsyncAPI is starting to make an impression now. Other variants to API technologies such as DRPC are showing up.

If you’re new to GraphQL you might find a couple of other posts on the subject helpful:

  • GraphQL Mindmap
  • GraphQL
  • Useful Tech Resources

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Logging in Action – has gone to the printers!

07 Monday Feb 2022

Posted by mp3monster in Books, Fluentd, General, manning, Technology

≈ 1 Comment

Tags

Amazon, Barnes & Noble, book, logging, Logging in Action, manning, print, Waterstones

The final leg of getting the book published has taken a lot longer than had been expected. But we’ve just been told that the book has been sent to the printers. This means:

  • final eBook will be available from Manning in about 1 week
  • Preordered print copies of the book will be dispatched in about 2 weeks
  • The alternative ebook formats for mobile readers e.g. kindle etc available in about 3 weeks
  • The book will become available to purchase from other book stores such as
    Amazon in 3-4 weeks
  • Safari Books Online and Apple stores will have the ebook in 4-5 weeks

Here are some links for buying the book …

  • Manning
  • Amazon UK – Amazon US – Amazon DE – Amazon Fr
  • Barnes & Noble, Waterstones
  • Safari Online Books

It also means the project from a writing perspective is complete. But we’re starting to look at the additional examples we’ll add to the GitHub repo. These will be dependent upon the book.

The complete cover artworks …

We’ve got print books now …

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Kubernetes Best Practises – Review & Mindmaps

13 Thursday Jan 2022

Posted by mp3monster in APIs & microservices, Cloud, Cloud Native, development, General, Technology

≈ 2 Comments

Tags

"best practise", book, Istio, Kubernetes, mindmap, review

I’ve had some time to catch up on books I’d like to read, including Kubernetes Best Practises in the last few weeks. While I think I have a fair handle on Kubernetes, the development of my understanding has been a bit ad-hoc as I’ve dug into different areas as I’ve needed to know more. This meant reading a Dummies/Introduction to entry style guide would, to an extent, likely prove to be a frustrating read. Given this, I went for the best practises book because if I don’t understand the practises, then there are gaps in my understanding still, and I can look at more foundation resources.

As it goes, this book was perfect. It quickly covered the basics of the different aspects of Kubernetes helping to give context to the more advanced aspects, and the best practices become almost a formulated summary in each section. The depth of coverage and detail is certainly very comprehensive, explaining the background of CNI (Container Network Interface) to network-level security within Kubernetes.

The book touched upon Service Meshes such as Istio and Linkerd2 but didn’t go into great depth, but again this is probably down to the fact that Service Mesh ideas are still maturing, and you have initiatives like SMI (Service Mesh Interface still in the CNCF’s sandbox).

In terms of best practices, that really stood out for me:

  • Use of Taints and Tolerations for refined control of pod deployment (Allowing affinity to be controlled to optimise resilience, or direct types of pod deployment to nodes with specialist capabilities such as GPU).
  • There are a lot more differences and options then you might realize in terms of ingress controller capabilities, so take time to identify what you may need from an ingress controller.
  • Don’t forget pods can be scaled vertically with the VPA (Vertical Pod Autoscaler)as well as horizontally through the HPA.
  • While using a managed persistence service will make statement storage a lot easier, stateful sets will give you a very portable solution.

As with a lot of technical books I read. As I go through the book I build up a mind map of what I think are the key points. Doing so leaves me with a resource I can use as a quick reference, but creating the mind map helps reinforce the learning. So here is the mind map …


  • mindmap in iThoughts format
  • mindmap in FreeMind format
  • mindmap as an expanded png

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Greening our work compute needs

13 Monday Dec 2021

Posted by mp3monster in Cloud, General, Technology

≈ Leave a comment

Tags

Cloud, CSO, Security, VDI, VPN

As a consultant working with clients, we always need to address security considerations for clients, their networks and data. Typically this might mean ensuring I could connect to the correct network through a VPN with the secure client software installed. Then work through a Citrix set-up for the tools we’re allowed to use.

Since the start of the pandemic, there seems to be a marked shift towards issuing consultants with customer provided laptops that have been configured and locked down. This means I can’t use the client laptop to connect to my employer’s network to interact with our own systems – making it easy to leverage our existing resources to support the customer and conversely no trust or contractual position that might allow our company devices connecting to a VPN or ring-fenced part of a network.

Interestingly there seems to have been a drift away from the ideas of BYOD (Bring Your Own Device) which may come from the fact that outside of smaller very tech-savvy organizations, BYOD can be seen as challenging to support.

As this Google Trends report shows over the last five years the trend has been until the last couple of months showing a generally downward trend. Not authoritative proof, but hints that it hasn’t accelerated as you might expect given remote working.

By the customer supplying a laptop, there is an effort to control intrusion and other security risks. But the problem is, now I have a device that I could easily take off-line and work to defeat the security setup and the client would be non the wiser, or worse it is another laptop that could ‘get lost’ or ‘stolen’ with a greater chance of having sensitive material. Every new device is without a doubt an elevated risk for the client and a cost to support (this of course is also an argument for not applying BYOD).

Continue reading →

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Detailed (Low Level) documentation

10 Friday Dec 2021

Posted by mp3monster in development, General, Technology

≈ Leave a comment

Tags

code, development, documentation

Low level aka detailed design documentation has been an interesting point of debate. We range from the agile manifesto which states focus should be on working code over documentation and people using this as an argument for not producing documentation. On the other end of the spectrum as someone working for a large SI, documentation is more often than not contractually binding and accurate docs are key when taking work from a different supplier organization.

It is clear that documentation is an essential element. But I do agree with the agile manifesto, a business operates on its software, not documents, although the docs help us keep the software maintained and running.

How do we balance the age-old conflicts of …

  • Documents get out of date because they are kept separate from the implementation
  • Documents, particularly when rushed don’t provide the information necessary
  • Document templates having sections used a tickboxes rather than guide rails
  • Making sure we’re working with the most upto date document

Possibilities

One of the key issues for documents getting out of date is a compound issue of accessibility, visibility and ease of maintenance. These compound to separate the documentation from the reality of code and configuration.

This can be eased by bringing documentation to being ‘physically’ closer to the code as we often see with readme markdown files on GitHub for example. But we can get closer with quality code commenting, particularly for each package and module. Just about every code or notation format had its own document generator from well-proven Javadoc to Terradoc for Terraform. To illustrate my point here are a couple of examples:

  • https://docs.oracle.com/javase/8/docs/api/java/io/BufferedReader.html
  • https://ruby-doc.org/stdlib-3.0.3/libdoc/observer/rdoc/Observable.html

If done well the documentation can be generated and deliver the right information. It would mean in structured change management the change task for the code includes the documentation. The ideas behind combining code and documentation can be seen with good API Blueprints.

When you still need to produce publishable documents, you have the opportunity to stitch multiple class and package generated docs together using tools such as pandoc. Arguably it would be the developer’s job to establish the pandoc configuration file (Documentation as Code).

You can add to this if done carefully, by adding diagrams such as UML representations. Importantly this process can generate representations that include lots of detail that would be noise to the key representation (time for tools like Sparx to support annotations that can give hints as to what to show in a generated model).

Pitfalls

The biggest risks of this approach are:

  • People paying lip service to documenting code, or using the argument that agile means no documentation (an age old misrepresentation).
  • Comments reflect the code correctly
  • Assuming the documentation will be clear because it is writte6x n

These pitfalls could be in theory be addressed through some smarts such as comparing the volume documentation generated against the number of lines of code and code complexity metrics.

But like many things, good culture and good application of principles are essential.

Exploring further

There are growing dedicated resources in this space, check out:

  • https://idratherbewriting.com/
  • https://swimm.io/

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GitHub Actions on OCI

29 Monday Nov 2021

Posted by mp3monster in development, General, Oracle, Technology

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actions, Cloud, free, GitHub, OCI, Presentation, runners, slide

Today was the first run of some new presentation material looking at the use of GitHub Actions using Runners deployed on OCI Free Tier. The presentation was actually physical rather than virtual which was after 2 years of virtual presenting, rather refreshing. Not to mention the UKOUG hosted the event at the Oval Cricket ground, which made for an interesting venue. The example configuration is included in our GitHub OCI Utilities repository (as we use this solution to help validate and test our development work).

The presentation itself (which includes screenshots of the setup of a simple Action and runner) is here, note I have disconnected my Runners, but you will be able to see the Action configuration but if you try to trigger activity through my repository then nothing will happen.

GitHub Actions – using Free Oracle Cloud Infrastructure (OCI) from Phil Wilkins
Implementing GitHub Action Handlers (aka Runners) on OCI
Continue reading →

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Busy week with webinars & virtual conferences …

19 Friday Nov 2021

Posted by mp3monster in General, Technology

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Tags

API, conference, DOAG, Flexagon, Flexdeploy, webinar

It has been a busy week with the day job of delivering to customers, with a webinar with Oracle, Flexagon and a customer – Heathrow Airport. Plus two technical sessions for DOAG.

Webinar

The webinar is the latest step in the partnership between Capgemini and Flexagon. If you’d like to see it, the recording can be accessed here.

The webinar development was very much a team effort with Oracle providing the hosting and promo logistics (particularly from Jurgen Kress and input from Daryl Eicher). Presentation development effort with Flexagon (Dan Goerdt and Tanya O’Connor). Of course the great input from our Heathrow customers – Mark South and Nick Byng-Maddick.

We have another blog post related to the webinar sharing some more detail. This will be published in a week or so on blog.oracle.com.

DOAG

The Deutsche Oracle Anwendergruppe (DOAG) conference took place virtually this week. DOAG and the UKOUG events are probably the biggest of the European user group events. With UKOUG happening at the end of the month.

My presentations at DOAG have been an update on which GraphQL, gRPC or REST API technology to use (see the presentation material here), along with a brand new presentation, again relating to APIs. But this time we’re looking at the application and capabilities of the Oracle Cloud’s API which can allow us to manage a wide range of services (see here). While I don’t have the demo piece recorded, you can see the slide aspect here.

Coming up

As mentioned I will be presenting at UKOUG Together. I have another brand new presentation for this as well, which will look at GitHub Actions combined with Oracle Cloud. We also have our first 2022 conference confirmed, in the form of API World.

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Presenting with Oracle, Flexagon and Heathrow Airport

11 Thursday Nov 2021

Posted by mp3monster in General, Oracle, Technology

≈ Leave a comment

Tags

Flexagon, Heathrow Airport, Oracle, webinar

We’re excited to be presenting on November 16th 4.30pm CET (3.30pm GMT). I hope you can join us by registering here

Heathrow rapidly moves to Oracle Cloud and connects with hybrid Integration.

The continuous delivery of constant small innovations can bring benefits faster without risks. Join us to hear how Capgemini’s Agile Innovation Platform (AIP) combined with Flexagon’s FlexDeploy DevOps platform enable this model of innovation and achieve tangible benefits to customers using the cloud capabilities and traditional on-premises ERP.

Phil Wilkins, Capgemini Integration Architect, and Dan Goerdt, President of Flexagon will describe how the combination are highly effective at delivering micro-innovation demonstrated through real-world customer results.

From this session, you will learn:

  • How the Agile Innovation Platform’s building blocks and templates allow development teams to reduce time to value.
  • How FlexDeploy brings unique benefits to both Open Source and Oracle-specific technologies.
  • What were the challenges solved and benefits gained by actual customers using AIP and FlexDeploy.
  • How Integration is the foundation of continuous delivery and innovation.

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