Current development cycles face abounding challenges such as an evolving mural of appliance architectonics (Monolithic to Microservices), the charge to frequently arrange features, and new IaaS and PaaS environments. This causes abounding issues throughout the organization, from the development teams all the way to operations and management.
In this blog post, we will appearance you how you can set up a bounded arrangement that will abutment MongoDB, MongoDB Ops Manager, and OpenShift. We will airing through the assorted accession accomplish and authenticate how attainable it is to do active appliance development with MongoDB and OpenShift.
MongoDB is the next-generation database that is congenital for accelerated and accepted appliance development. Its adjustable abstracts archetypal — the adeptness to absorb both structured or baggy abstracts — allows developers to body applications faster and added finer than anytime before. Enterprises can dynamically adapt schemas after downtime, consistent in beneath time advancing abstracts for the database, and added time putting abstracts to work. MongoDB abstracts are added carefully accumbent to the anatomy of altar in a programming language. This makes it simpler and faster for developers to archetypal how abstracts in the appliance will map to abstracts stored in the database, consistent in bigger activity and accelerated development.
MongoDB Ops Administrator (also attainable as the hosted MongoDB Billow Administrator service) appearance visualization, custom dashboards, and automated alerting to advice administer a circuitous environment. Ops Administrator advance 100 key database and systems bloom metrics including operations counters, CPU utilization, archetype status, and any bulge status. The metrics are deeply appear to Ops Administrator area they are candy and visualized. Ops Administrator can additionally be acclimated to accommodate seamless no-downtime upgrades, scaling, and advancement and restore.
Red Hat OpenShift is a complete attainable antecedent appliance belvedere that helps organizations develop, deploy, and administer absolute and container-based applications seamlessly beyond infrastructures. Based on Docker alembic packaging and Kubernetes alembic array management, OpenShift delivers a high-quality developer acquaintance aural a stable, secure, and scalable operating system. Appliance lifecycle administration and active appliance development applique admission efficiency. Interoperability with assorted casework and technologies and added alembic and chart models let you adapt your environment.
In adjustment to chase this example, you will charge to accommodated a cardinal of requirements. You will charge a arrangement with 16 GB of RAM and a RHEL 7.2 Server (we acclimated an instance with a GUI for simplicity). The afterward software is additionally required:
Ansible is a actual able attainable antecedent automation language. What makes it altered from added administration tools, is that it is additionally a deployment and chart tool. In abounding respects, aiming to accommodate ample abundance assets to a avant-garde array of automation challenges. While Ansible provides added advantageous drop-in replacements for abounding amount capabilities in added automation solutions, it additionally seeks to break added aloft baffling IT challenges.
We will install the Automation Abettor assimilate the servers that will become allotment of the MongoDB replica set. The Automation Abettor is allotment of MongoDB Ops Manager.
In adjustment to install Ansible appliance yum you will charge to accredit the EPEL repository. The EPEL (Extra Bales for Action Linux) is athenaeum that is apprenticed by the Fedora Special Interest Group. This athenaeum contains a cardinal of added bales affirmed not to alter or battle with the abject RHEL packages.
The EPEL athenaeum has a annex on the Server Optional and Server Extras repositories. To accredit these repositories you will charge to assassinate the afterward commands:
To install/enable the EPEL athenaeum you will charge to do the following:
Once complete you can install ansible by active the afterward command:
Vagrant is a command band annual that can be acclimated to administer the lifecycle of a basic machine. This apparatus is acclimated for the accession and administration of the Red Hat Alembic Development Kit.
Vagrant is not included in any accepted repository, so we will charge to install it. You can install Accidental by enabling the SCLO athenaeum or you can get it anon from the Accidental website. We will use the closing approach:
The Red Hat Alembic Development Kit requires a virtualization software assemblage to execute. In this blog we will use VirtualBox for the virtualization software.
VirtualBox is best done appliance a athenaeum to ensure you can get updates. To do this you will charge to chase these steps:
Once the install is complete you will appetite to barrage VirtualBox and ensure that the Bedfellow Arrangement is on the actual subnet as the CDK has a absence for it setup. The blog will advantage this absence as well. To verify that the host is on the actual domain:
Docker containers are acclimated to amalgamation software applications into portable, abandoned stores. Developing software with containers helps developers actualize applications that will run the aforementioned way on every platform. However, avant-garde microservice deployments about use a scheduler such as Kubernetes to run in production. In adjustment to absolutely simulate the assembly environment, developers crave a bounded adaptation of assembly tools. In the Red Hat stack, this is supplied by the Red Hat Alembic Development Kit (CDK).
The Red Hat CDK is a customized basic apparatus that makes it attainable to run circuitous deployments akin production. This agency circuitous applications can be developed appliance assembly brand accoutrement from the actual start, acceptation developers are absurd to acquaintance problems stemming from differences in the development and assembly environments.
Now let’s airing through accession and agreement of the Red Hat CDK. We will actualize a containerized multi-tier appliance on the CDK’s OpenShift instance and go through the absolute workflow. By the end of this blog column you will apperceive how to run an appliance on top of OpenShift and will be accustomed with the amount appearance of the CDK and OpenShift. Let’s get started…
The prerequisites for active the CDK are Accidental and a virtualization applicant (VirtualBox, VMware Fusion, libvirt). Accomplish abiding that both are up and active on your machine.
Start by activity to Red Hat Product Downloads (note that you will charge a Red Hat cable to admission this). Baddest ‘Red Hat Alembic Development Kit’ beneath Product Variant, and the acclimatized adaptation and architecture. You should download two packages:
The Alembic Accoutrement amalgamation is a set of plugins and templates that will advice you alpha the Accidental box. In the apparatus subfolder you will acquisition Accidental files that will configure the basic apparatus for you. The plugins binder contains the Accidental add-ons that will be acclimated to annals the new basic apparatus with the Red Hat cable and to configure networking.
Unzip the alembic accoutrement annal into the basis of your user binder and install the Accidental add-ons.
You can analysis if the plugins were absolutely installed with this command:
Add the box you downloaded into Vagrant. The aisle and the name may alter depending on your download binder and the box version:
Check that the accidental box was appropriately added with the box annual command:
We will use the Vagrantfile that comes alien with the CDK and has abutment for OpenShift.
In adjustment to use the landrush plugin to configure the DNS we charge to add the afterward two curve to the Vagrantfile absolutely as beneath (i.e. PUBLIC_ADDRESS is a acreage in the Vagrantfile and does not charge to be replaced) :
This will acquiesce us to admission our appliance from alfresco the basic apparatus based on the hostname we configure. After this plugin, your applications will be attainable alone by IP abode from aural the VM.
Save the changes and alpha the basic apparatus :
During initialization, you will be prompted to annals your Accidental box with your RHEL cable credentials.
Let’s analysis what aloof happened here. On your bounded machine, you now accept a alive instance of OpenShift active central a basic machine. This instance can allocution to the Red Hat Anthology to download images for the best accepted appliance stacks. You additionally get a clandestine Docker anthology for autumn images. Docker, Kubernetes, OpenShift and Atomic App CLIs are additionally installed.
Now that we accept our Accidental box up and running, it’s time to actualize and arrange a sample appliance to OpenShift, and actualize a connected deployment workflow for it.
The OpenShift animate should be attainable at https://10.1.2.2:8443 from a browser on your host (this IP is authentic in the Vagrantfile). By default, the login accreditation will be openshift-dev/devel. You can additionally use your Red Hat accreditation to login. In the console, we actualize a new project:
Next, we actualize a new appliance appliance one of the congenital ‘Instant Apps’. Instant Apps are predefined appliance templates that cull specific images. These are an attainable way to bound get an app up and running. From the annual of Instant Apps, baddest “nodejs-mongodb-example” which will alpha a database (MongoDB) and a web server (Node.js).
For this application, we will use the antecedent cipher from the OpenShift GitHub athenaeum amid here. If you appetite to chase forth with the webhook accomplish later, you’ll charge to angle this athenaeum into your own. Once you’re ready, admission the URL of your repo into the SOURCE_REPOSITORY_URL field:
There are two added ambit that are important to us – GITHUB_WEBHOOK_SECRET and APPLICATION_DOMAIN:
Once these ethics are configured, we can ‘Create’ our application. This brings us to an advice folio which gives us some attainable CLI commands as able-bodied as our webhook URL. Copy this URL as we will use it after on.
OpenShift will afresh cull the cipher from GitHub, acquisition the acclimatized Docker angel in the Red Hat repository, and additionally actualize the body configuration, deployment configuration, and annual definitions. It will afresh bang off an antecedent build. You can appearance this action and the assorted accomplish aural the web console. Once completed it should attending like this:
In adjustment to use the Landrush plugin, there is added accomplish that are acclimatized to configure dnsmasq. To do that you will charge to do the following:
Great! Our appliance has now been congenital and deployed on our bounded OpenShift environment. To complete the Connected Deployment activity we aloof charge to add a webhook into our GitHub athenaeum we authentic above, which will automatically amend the active application.
To set up the webhook in GitHub, we charge a way of acquisition from the attainable internet to the Accidental apparatus active on your host. An attainable way to accomplish this is to use a third affair forwarding annual such as ultrahook or ngrok. We charge to set up a URL in the annual that assiduously cartage through a adit to the webhook URL we affected earlier.
Once this is done, attainable the GitHub repo and go to Settings -> Webhooks & casework -> Add webhook. Beneath Payload URL admission the URL that the forwarding annual gave you, additional the abstruse (if you authentic one aback ambience up the OpenShift project). If your webhook is configured accurately you should see article like this:
To analysis out the pipeline, we charge to accomplish a change to our activity and advance a accomplish to the repo.
Any attainable way to do this is to adapt the views/index.html file, e.g: (Note that you can additionally do this through the GitHub web interface if you’re activity lazy). Accomplish and advance this change to the GitHub repo, and we can see a new body is triggered automatically aural the web console. Once the body completes, if we afresh attainable our appliance we should see the acclimatized avant-garde page.
We now accept Connected Deployment configured for our application. Throughout this blog post, we’ve acclimated the OpenShift web interface. However, we could accept performed the aforementioned accomplishments appliance the OpenShift animate (oc) at the command-line. The easiest way to agreement with this interface is to ssh into the CDK VM via the Accidental ssh command.
Before wrapping up, it’s attainable to accept some of the concepts acclimated in Kubernetes, which is the basal chart band in OpenShift.
A pod is one or added containers that will be deployed to a bulge together. A pod represents the aboriginal assemblage that can be deployed and managed in OpenShift. The pod will be assigned its own IP address. All of the containers in the pod will allotment bounded accumulator and networking.
A pod lifecycle is defined, arrange to node, run their container(s), avenue or removed. Once a pod is active afresh it cannot be changed. If a change is acclimatized afresh the absolute pod is concluded and recreated with the acclimatized configuration.
For our archetype application, we accept a Pod active the application. Pods can be scaled up/down from the OpenShift interface.
These administer the lifecycle of Pods.They ensure that the actual cardinal of Pods are consistently active by ecology the appliance and endlessly or creating Pods as appropriate.
Pods are aggregate into services. Our architectonics now has four services: three for the database (MongoDB) and one for the appliance server JBoss.
With every new cipher accomplish (assuming you accoutrement the GitHub webhooks) OpenShift will amend your application. New pods will be started with the advice of archetype controllers active your new appliance version. The old pods will be deleted. OpenShift deployments can accomplish rollbacks and accommodate assorted arrange strategies. It’s adamantine to enlarge the advantages of actuality able to run a assembly ambiance in development and the efficiencies acquired from the fast acknowledgment aeon of a Connected Deployment pipeline.
In this post, we accept apparent how to use the Red Hat CDK to accomplish both of these goals aural a short-time anatomy and now accept a Node.js and MongoDB appliance active in containers, deployed appliance the OpenShift PaaS. This is a abundant way to bound get up and active with containers and microservices and to agreement with OpenShift and added elements of the Red Hat alembic ecosystem.
In this section, we will actualize the basic machines that will be acclimatized to set up the replica set. We will not airing through all of the accomplish of ambience up Red Hat as this is prerequisite knowledge.
What we will be accomplishing is creating a abject RHEL 7.2 basal install and afresh appliance the VirtualBox interface to carbon the images. We will do this so that we can calmly install the replica set appliance the MongoDB Automation Agent.
We will additionally be installing a no countersign generated ssh keys for the Ansible Playbook install of the automation engine.
Please accomplish the afterward steps:
Once this is done you should attach a cable and do a yum amend on the bedfellow RHEL install.
The final footfall will be to accomplish new ssh keys for the basis user and alteration the keys to the bedfellow machine. To do that amuse do the afterward steps:
Once this is complete you can shut bottomward the RHEL Abject bedfellow image. We will now carbon this to accommodate the MongoDB environment. The accomplish are as follows:
The final footfall for accepting the systems attainable will be to configure the hostnames, host-only ip and the host files. We will charge to additionally ensure that the systems can acquaint on the anchorage for MongoDB, so we will attenuate the firewall which is not meant for assembly purposes but you will charge to acquaintance your IT departments on how they administer aperture of ports.
Normally in a assembly environment, you would accept the servers in an centralized DNS system, about for the annual of this blog we will use hosts files for the purpose of names. We appetite to adapt the /etc/hosts book on the three MongoDB guests as able-bodied as the hosts.
The advice we will be appliance will be as follows:
To do so on anniversary of the guests do the following:
MongoDB Ops Administrator can be leveraged throughout the development, test, and assembly lifecycle, with analytical functionality alignment from array achievement ecology data, alerting, no-downtime upgrades, avant-garde agreement and scaling, as able-bodied as advancement and restore. Ops Administrator can be acclimated to administer up to bags of audible MongoDB clusters in a tenants-per-cluster appearance — isolating array users to specific clusters.
All aloft MongoDB Ops Administrator accomplishments can be apprenticed manually through the user interface or programmatically through the REST API, area Ops Administrator can be deployed by belvedere teams alms Action MongoDB as a Annual back-ends to appliance teams.
Specifically, Ops Administrator can arrange any MongoDB array cartography beyond bald metal or virtualized hosts, or in clandestine or attainable billow environments. A assembly MongoDB array will about be deployed beyond a minimum of three hosts in three audible availability areas — concrete servers, racks, or abstracts centers. The accident of one host will still bottle a quorum in the actual two to ensure always-on availability.
Ops Administrator can arrange a MongoDB array (replica set or sharded cluster) beyond the hosts with Ops Administrator agents running, appliance any acclimatized MongoDB adaptation and enabling admission ascendancy (authentication and authorization) so that alone applicant admission presenting the actual accreditation are able to admission the cluster. The MongoDB array can additionally use SSL/TLS for over the wire encryption.
Once a MongoDB array is auspiciously deployed by Ops Manager, the cluster’s affiliation cord can be calmly generated (in the case of a MongoDB replica set, this will be the three hostname:port pairs afar by commas). An OpenShift appliance can afresh be configured to use the affiliation cord and affidavit accreditation to this MongoDB cluster.
To use Ops Administrator with Ansible and OpenShift:
By accepting three MongoDB instances that we appetite to install the automation abettor it would be attainable abundant to login and run the commands as apparent in the Ops Administrator abettor accession information. About we accept created an ansible playbook that you will charge to change to customize.
The playbook looks like:
You will charge to adapt it with the advice you aggregate from the Ops Manager.
You will charge to actualize this book as your basis user and afresh amend the /etc/ansible/hosts book and add the afterward lines:
Once this is done you are attainable to run the ansible playbook. This playbook will acquaintance your Ops Administrator Server, download the latest client, amend the applicant config files with your APiKey and Groupid, install the applicant and afresh alpha the client. To run the playbook you charge to assassinate the command as root:
Use MongoDB Ops Administrator to actualize a MongoDB Replica Set and add database users with acclimatized admission rights:
Up until now, we’ve explored the Red Hat alembic ecosystem, the Red Hat Alembic Development Kit (CDK), OpenShift as a bounded deployment, and OpenShift in production. In this final section, we’re activity to booty a attending at how a aggregation can booty advantage of the avant-garde appearance of OpenShift in adjustment to automatically move new versions of applications from development to assembly — a action accepted as Connected Commitment (or Connected Deployment, depending on the akin of automation).
OpenShift supports altered setups depending on authoritative requirements. Some organizations may run a absolutely abstracted array for anniversary ambiance (e.g. dev, staging, production) and others may use a distinct array for several environments. If you run a abstracted OpenShift PaaS for anniversary environment, they will anniversary accept their own committed and abandoned resources, which is cher but ensures a (a botheration with the development array cannot affect production). However, assorted environments can cautiously run on one OpenShift array through the platform’s abutment for adeptness isolation, which allows nodes to be committed to specific environments. This agency you will accept one OpenShift array with accepted masters for all environments, but committed nodes assigned to specific environments. This allows for scenarios such as alone acceptance assembly projects to run on the added able / big-ticket nodes.
OpenShift integrates able-bodied with absolute Connected Integration / Connected Commitment tools. Jenkins, for example, is attainable for use central the belvedere and can be calmly added to any projects you’re planning to deploy. For this audience however, we will stick to out-of-the-box OpenShift features, to appearance workflows can be complete out of the OpenShift fundamentals.
The workflow of our connected commitment activity is illustrated below:
The diagram shows the developer on the left, who is alive on the activity in their own environment. In this case, the developer is appliance Red Hat’s CDK active on their local-machine, but they could appropriately be appliance a development ambiance provisioned in a alien OpenShift cluster.
To move cipher amid environments, we can booty advantage of the angel streams abstraction in OpenShift. An angel beck is apparently agnate to an angel athenaeum such as those begin on Docker Hub — it is a accumulating of accompanying images with anecdotic names or “tags”. An angel beck can accredit to images in Docker repositories (both bounded and remote) or added angel streams. However, the analgesic affection is that OpenShift will accomplish notifications whenever an angel beck changes, which we can calmly configure projects to accept and acknowledge to. We can see this in the diagram aloft — aback the developer is attainable for their changes to be best up by the aing ambiance in line, they artlessly tag the angel appropriately, which will accomplish an angel beck notification that will be best up by the staging environment. The staging ambiance will afresh automatically clean and redeploy any containers appliance this angel (or images who accept the afflicted angel as a abject layer). This can be absolutely automated by the use of Jenkins or a agnate CI tool; on a check-in to the antecedent ascendancy repository, it can run a test-suite and automatically tag the angel if it passes.
To move amid staging and assembly we can do absolutely the aforementioned affair — Jenkins or a agnate apparatus could run a added absolute set of arrangement tests and if they canyon tag the angel so the assembly ambiance picks up the changes and deploys the new versions. This would be accurate Connected Deployment — area a change fabricated in dev will bear automatically to assembly after any chiral intervention. Abounding organizations may instead opt for Connected Commitment — area there is still a chiral “ok” acclimatized afore changes hit production. In OpenShift this can be calmly done by acute the images in staging to be tagged manually afore they are deployed to production.
Now that we’ve advised the workflow, let’s attending at a absolute archetype of blame an appliance from development to production. We will use the simple MLB Parks appliance from a antecedent blog column that connects to MongoDB for accumulator of assiduous data. The appliance displays assorted advice about MLB parks such as alliance and burghal on a map. The antecedent cipher is attainable in this GitHub repository. The archetype assumes that both environments are hosted on the aforementioned OpenShift cluster, but it can be calmly acclimatized to acquiesce advance to addition OpenShift instance by appliance a accepted registry.
If you don’t already accept a alive OpenShift instance, you can bound get started by appliance the CDK, which we additionally covered in an beforehand blogpost. Alpha by logging in to OpenShift appliance your credentials:
Now we’ll actualize two new projects. The aboriginal one represents the assembly ambiance (mlbparks-production):
And the additional one will be our development ambiance (mlbparks):
After you run this command you should be in the ambience of the development activity (mlbparks). We’ll alpha by creating an alien annual to the MongoDB database replica-set.
Openshift allows us to admission alien services, acceptance our projects to admission casework that are alfresco the ascendancy of OpenShift. This is done by defining a annual with an abandoned selector and an endpoint. In some cases you can accept assorted IP addresses assigned to your endpoint and the annual will act as a amount balancer. This will not assignment with the MongoDB replica set as you will appointment issues not actuality able to affix to the PRIMARY bulge for autograph purposes. To acquiesce for this in this case you will charge to actualize one alien annual for anniversary node. In our case we accept three nodes so for allegorical purposes we accept three annual files and three endpoint files.
Service Files: replica-1_service.json
Using the aloft replica files you will charge to run the afterward commands:
Now that we accept the endpoints for the alien replica set created we can now actualize the MLB parks appliance a template. We will use the antecedent cipher from our audience GitHub repo and the s2i body action which will actualize a alembic for our antecedent cipher (note this athenaeum has no Dockerfile in the annex we use). All of the ambiance variables are in the mlbparks-template.json, so we will aboriginal actualize a arrangement afresh actualize our new app:
As able-bodied as architecture the application, agenda that it has created an angel beck alleged mlbparks for us.
Once the body has finished, you should accept the appliance up and active (accessible at the hostname begin in the pod of the web ui) congenital from an angel stream.
We can get the name of the angel created by the body with the advice of the call command:
So OpenShift has congenital the angel mlbparks@sha256:5f50e1ffbc5f4ff1c25b083e1698c156ca0da3ba207c619781efcfa5097995ec, added it to the bounded athenaeum at 172.30.76.179:5000 and tagged it as latest in the mlbparks angel stream.
Now we apperceive the angel ID, we can actualize a tag that marks it as attainable for use in assembly (use the SHA of your angel here, but aish the IP abode of the registry):
We’ve carefully acclimated the altered SHA assortment of the angel rather than the tag latest to analyze our image. This is because we appetite the assembly tag to be angry to this accurate version. If we hadn’t done this, assembly would automatically clue changes to latest, which would accommodate abstinent code.
To acquiesce the assembly activity to cull the angel from the development repository, we charge to admission cull rights to the annual account associated with assembly environment. Agenda that mlbparks-production is the name of the assembly project:
OK, so now we accept an angel that can be deployed to the assembly environment. Let’s about-face the accepted activity to the assembly one:
To alpha the database we’ll use the aforementioned accomplish to admission the alien MongoDB as previous:
For the appliance allotment we’ll be appliance the angel beck created in the development activity that was tagged “production”:
This will actualize an appliance from the aforementioned angel generated in the antecedent environment.
You should now acquisition the assembly app is active at the provided hostname.
We will now authenticate the adeptness to both automatically move new items to production, but we will additionally appearance how we can amend an appliance after accepting to amend the MongoDB schema. We accept created a annex of the cipher in which we will now add the analysis to the alliance for the ballparks, after afterlight the schema.
Start by activity aback to the development project:
Traditionally with a RDBMS if we appetite to add a new aspect to in our appliance to be persisted to the database, we would charge to accomplish the changes in the cipher as able-bodied as accept a DBA manually amend the action at the database. The afterward cipher is an archetype of how we can adapt the appliance cipher after manually authoritative changes to the MongoDB schema.
Once the body finishes running, a deployment assignment will alpha that will alter the active container. Once the new adaptation is deployed, you should be able to see East beneath Toronto for example.
If you analysis the assembly version, you should acquisition it is still active the antecedent adaptation of the code.
OK, we’re blessed with the change, let’s tag it attainable for production. Again, run oc to get the ID of the angel tagged latest, which we can afresh tag as production:
This tag will activate an automated deployment of the new angel to the assembly environment.
Rolling aback can be done in altered ways. For this example, we will cycle aback the assembly ambiance by tagging assembly with the old angel ID. Acquisition the appropriate id by active the oc command again, and afresh tag it:
Over the advance of this post, we’ve advised the Red Hat alembic ecosystem and OpenShift Alembic Belvedere in particular. OpenShift builds on the avant-garde chart capabilities of Kubernetes and the believability and adherence of the Red Hat Action Linux operating arrangement to accommodate a able appliance ambiance for the enterprise. OpenShift adds several account of its own that accommodate important appearance for organizations, including source-to-image tooling, angel streams, activity and user a and a web UI. This column showed how these appearance assignment calm to accommodate a complete CD workflow area cipher can be automatically pushed from development through to assembly accumulated with the ability and capabilities of MongoDB as the backend of best for applications.
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