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Apple Watch - go, no go, go
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IBM HTTP Server - Tinkering with CMS Keystore Passwords
Wed, Oct 11th 2017 37


"Kubernetes Microservices with Docker" - A Book Review
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As mentioned a few weeks ago: -

I read and review books for the British Computer Society (BCS) on a semi-regular basis.

These books are provided to me by the publisher, via the BCS, at no cost to me. Apart from the book, I receive no inducement to produce the reviews.

I typically choose books related to my professional career, as an IT Specialist working with IBM Cloud technologies, and pick subjects and topics that are close to my heart, and my interests.

This time is no different … I've been working with Docker and Kubernetes for the past year or so, both on my own macOS machines and also on the IBM Bluemix PaaS solution.

Whilst I had a fairly good knowledge of Docker, Kubernetes was relatively new to me, so this book - Kubernetes Microservices with Docker - was a perfect introduction.

In the book, the author, Deepak Vohra, spends the first few chapters introducing the concepts of containerisation, Docker and then Kubernetes itself.

This, to me, was a perfect introduction, and allowed me to understand the core concept of pods; like whales, containers run in pods ( you have to admire the geek humour in there, given that the Docker logo is a whale ).

So the pod provides the core services, including networking and storage, to the containers that run therein.

Other than pods, Kubernetes has a number of other core capabilities, including services, replication and storage volumes.

As the book progresses, Deepak uses examples, leveraging commonly-used tools and technologies, including mySQL, Oracle, Cassandra, Hadoop and Kafka, to demonstrate how Kubernetes works, in terms of creating pods of containers, using stock images, accessing the underlying application services via command-line and browser, and then scaling the service up and down using the Kubernetes replication capabilities.

This is an extremely useful approach, and works on the Carnegie Hall principle ( "Q:How do I get to Carnegie Hall?" "A:Practice" ) where one repeats a method until it becomes "muscle-memory".

Finally, he concluded by describing AND demonstrating how Kubernetes supports the multiple-pod principle, which is essential to support a multi-layer architecture, where one has few/no single points of failure.

As an example, one might have a Kubernetes service comprising a web server ( e.g. Apache or Nginx ), a web application server ( e.g. WebSphere Liberty Profile ) and a database ( e.g. mySQL or Oracle ), with each capability running in a single pod, scaling up and down as required, with all three pods linked together, and sharing common services, such as networking.

So, to summarise this book, it's a concise but clear introduction to containers, Docker and Kubernetes, using simple real-world examples to pass on the core concepts, via repetition, and is a very useful enabler.

In terms of size, it's a 432 page ebook ( I'm reading it using Apple iBooks ) and was shipped to me in PDF form.

If you're interested in containerisation, I'd definitely advocate this book, whether you're a complete beginner, or already on your journey of enablement.

Out of 10, I'd give this book a clear 10, in the main because of it's relative brevity and it's use of worked examples.



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http://portal2portal.blogspot.com/2017/10/kubernetes-microservices-with-docker.html
Oct 09, 2017
28 hits



Recent Blog Posts
26
More on Elasticsearch, Logstash and Kibana (ELK)
Fri, Oct 20th 2017 10:28a   Dave Hay
Following earlier posts: -Tinkering with Elasticsearch and Kibana - on Docker, of courseFurther stories of a tinkerer - this time it's IBM BPM, Apache Kibana and ElasticsearchIBM BPM and Elasticsearch - with added TLSI've had a brief play with a new ( to me ) Docker image, ELK: -sebp/elkCollect, search and visualise log data with Elasticsearch, Logstash, and Kibana.using this documentation: -Elasticsearch, Logstash, Kibana (ELK) Docker image documentationThis time around, I built it using Dock
28
Zipping and Tarring on macOS - with added funkiness
Thu, Oct 19th 2017 5:41p   Dave Hay
So I had a specific requirement yesterday - I wanted to extract three specific files from a ZIP file.This is what I had: -unzip -l certificate-bundle.zipArchive: certificate-bundle.zip Length Date Time Name--------- ---------- ----- ---- 0 10-19-2017 16:58 ca/ 1310 10-19-2017 16:58 ca/ca.crt 1679 10-19-2017 16:58 ca/ca.key 0 10-19-2017 16:58 node1/ 1379 10-19-2017 16:58 node1/node1.crt 1679 10-19-2017 16:58 node1/node1.key---------
27
IBM BPM and Elasticsearch - with added TLS
Thu, Oct 19th 2017 5:29p   Dave Hay
Following this: -Tinkering with Elasticsearch and Kibana - on Docker, of courseFurther stories of a tinkerer - this time it's IBM BPM, Apache Kibana and ElasticsearchI've been tinkering further with Elasticsearch on Docker, establishing a TLS connection between it and IBM BPM.Here's my notes: -Pull Imagedocker pull docker.elastic.co/elasticsearch/elasticsearch:5.6.3Start containeres=`docker run -d -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elas
125
Apple Watch - go, no go, go
Mon, Oct 16th 2017 3:29p   Dave Hay
So I had a weird experience last evening, and not in a good way.For no apparent reason, this was my Apple Watch: -and this: -I have no earthly idea what happened.So, being a true nerd, and a big fan of The IT Crowd, I decided to ( all together now ) TURN IT OFF AND ON AGAIN ….Obviously I couldn't read the display, what with it being all garbled n' all, so I just hit the big button on the right-hand side, below the digital crown and chose the appropriate gibberish - it was the one in red, so
101
IBM Cloud Private - My first foray
Mon, Oct 16th 2017 10:37a   Dave Hay
So this week, along with many other things, I'm starting to get to grips with the newly announced IBM Cloud Private: - IBM brings the power of cloud behind the enterprise firewall I'm running on Ubuntu Linux: - lsb_release -a No LSB modules are available. Distributor ID:    Ubuntu Description:    Ubuntu 16.04.3 LTS Release:    16.04 Codename:    xenial so started by installing the pre-requisites of VirtualBox and Vagrant: - sudo apt-get install virtualbox su
62
Ubuntu - Software Updater and the Insufficient Disk Space
Mon, Oct 16th 2017 8:13a   Dave Hay
So I'm trying to update Ubuntu 16.0.4.3 LTS using Software Updater, but couldn't get past this: -      Now I have LOADS of disk space: - df -kmh Filesystem                   Size  Used Avail Use% Mounted on udev                          16G     0   16G   0% /dev tmpfs                        3.2G  9.4M  3.2G   1% /run /dev/mapper/ubuntu--vg-root  2.7T  346G  2.2T  14% / tmpfs               
57
Git and Jenkins - Learning Resources
Fri, Oct 13th 2017 10:35a   Dave Hay
This is what I've been reading and using over the past few days: -git-server-dockerHow to Setup Git Repository and Credentials for Jenkins Jobs.ssh/id_rsa failed: permission deniedMy simply Git Cheatsheet4.2 Git on the Server - Getting Git on a Server2.5 Git Basics - Working with Remotes'Your branch is ahead of 'origin/master' by 1 commit' on explicit push [duplicate]Unable to push to repositorycannot push into git repositoryJenkins TutorialIBM WebSphere Liberty ConfigurationDeploying with
52
Jenkins to Git - SSH says "No"
Fri, Oct 13th 2017 10:28a   Dave Hay
As per my earlier post: -Learning Times - Or Git being a bit of a GitI'm on a voyage of discovery with Jenkins and Git.Whilst trying to plumb onto into t'other, I was hitting a blocker.To recap, I have Jenkins installed on my MacBook, running locally, and I have Git running on a Docker container on a remote Mac.Therefore, I'm connecting to the remote Git repository using SSH rather than, say, HTTPS or a local file-system.This works OK for me using Git commands such as: -git clone ssh://git@19
46
Learning Times - Or Git being a bit of a Git
Fri, Oct 13th 2017 9:56a   Dave Hay
I'm on a bit of a voyage of discovery this week, having previously been tinkering with Elasticsearch and Kibana a few days back: -Further stories of a tinkerer - this time it's IBM BPM, Apache Kibana and ElasticsearchNow I'm playing with Jenkins and Git, the latter of which is running on Docker, with the intention of automating the push of Java code to WebSphere Liberty Profile, also running in Docker.I also intend to get to grips with Maven at the same time, what's not to like ?Anyway, back
42
IBM HTTP Server - Checking Personal Certificates
Wed, Oct 11th 2017 3:54p   Dave Hay
Whilst on the subject of IBM HTTP Server (IHS), as per an earlier post: -IBM HTTP Server - Tinkering with CMS Keystore PasswordsI was "auditing" the SSL certificate that I'm using for IHS, specifically the signature algorithm.So I have a single certificate in the key store: -/opt/IBM/HTTPServer/bin/gskcapicmd -cert -list -db /opt/IBM/HTTPServer/APIC/ssl/keystore.kdb -pw passw0rdCertificates found* default, - personal, ! trusted, # secret key*- wlpn.uk.ibm.comwhich I validated as follows: -/op




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