We're looking at using Spring Cloud Task / Spring Cloud Data Flow for our batch processing needs as we're modernising from a legacy system. We don't want or need the whole microservices offering ... we want to be able to deploy jobs/tasks, kick off batch processes, have them log to a log file, and share a database connection pool and message queue. We don't need the whole PaaS that's provided by Spring Cloud Foundry, and we don't want to pay for that, but we do want the Data Flow / Task framework to be commercially supported. Is such an option available?
Spring Cloud Data Flow (SCDF) builds upon spring-cloud-deployer abstraction to deploy stream/task workloads to a variety of runtimes including Cloud Foundry, Kubernetes, Mesos and Yarn - see this visual.
You'd need a runtime for SCDF to orchestrate these workloads in production setting. If there's no scope for cloud infrastructure, the YARN based deployment could be a viable option for standalone bare-metal installation. Please review the reference guide and Apache Ambari provisioning tools for more details. There's a separate commercial support option available for this type of installation.
Related
I am newbie in SCDF. I have few micro services running behind Spring Cloud platform. Each services got multiple nodes. Can we use those existing services into SCDF platform as either SOURCE, PROCESSOR or SINK? If so, how would I get them into dashboard as they are already deployed as services!
SCDF doesn't probe on a given K8s cluster/namespace to automatically build the streaming data pipelines.
Today, it is imperative that the streaming/task "definitions" are created and deployed in SCDF first, and only then it is possible to monitor, scale, and manage the applications.
In case it wasn't apparent already, SCDF can only orchestrate the deployment and the management for event-streaming and batch/task Spring Boot applications. Not all kinds of application workloads are possible.
On DockerCon 2019 Docker announced the Docker Kubernetes Service (DKS).
Quoted from here:
Docker Enterprise 3.0’s Docker Kubernetes Service (DKS) integrates
Kubernetes container orchestration from the developer desktop to the
production server.
...It also provides an automated way to install and configure
Kubernetes applications across hybrid and multi-cloud deployments.
Other capabilities include security, access control, and lifecycle
management
And from here:
The Docker platform includes a secure and fully-conformant Kubernetes
environment for developers and operators of all skill levels,
providing out-of-the-box integrations for common enterprise
requirements while still enabling complete flexibility for expert
users.
After some searching and research I haven't succeed to fully understand the different solutions and features that DKS has to offer. So, my question is:
What DKS has to offer regarding topics like: Security, Networking, Access Management, etc'?
I'll start with what I discovered so far as an entry point for the discussion, hopefully that others will share there own understanding and experience and maybe provide some references and examples.
This is very basic - but I'll share what I found so far - starting with the product page as my entry point for research.
Security
Secure Kubernetes cluster with TLS authentication and encryption.
Integrated security for the application lifecycle with Docker Content Trust.
Integration with validated and certified 3rd party tools (monitoring, logging, storage,
networking, etc') .
Access control
Restricting visibility for different user groups and operate multi-tenant environments - I found only this: restrict services to worker nodes.
Advanced Access Controls Docker Enterprise includes integrated RBAC that works with corporate LDAP, Active Directory, PKI certificates and/or SAML 2.0 identity provider solutions - I found only this: Configure native Kubernetes role-based access control.
Networking
Found only this which is related to installation of cni plugins.
I think DKS offers much more regarding to integrating with 3rd party networking solutions - Quoted from the product page:
Out-of-the-box Networking Docker Enterprise includes Project Calico by
Tigera as the “batteries included” Kubernetes CNI plug-in for a highly
scalable, networking and routing solution. Get access to overlay
(IPIP), no overlay, and hybrid data-plane networking models in
addition to native Kubernetes ingress controllers for load balancing.
spring cloud or kubernates for service govern？
i want to use spring cloud to build microservice,but if the many microservices is online,it will have many online problem,such as Gray release ,monitor,version rollback and so on?what technolygy should use to manage microservices?
Spring Cloud and Kubernetes are the best environments for developing and running microservices, but they are both very different in nature and address different concerns.Spring cloud covers logging, monitoring, service discovery but not scaling and high availability which are very important for Microservice architecture.
Spring cloud has a rich set of java libraries for runtime concerns like client-side service discovery, load balancing, configuration update and metrics. Whereas Kubernetes is not only for Java platform and it doesn't need any specific libraries for service discovery, load balancing, metrics and scheduled jobs. For some areas like logging both use third-party tools like ELK.
Spring Cloud
Rich set of libraries help the developers to integrates different services easily.
Limited to only java
Scaling and high availability is not achieved unless taken care by an orchestrator.
Kubernetes
Is an open-source container management platform which helps to create different environments like dev, test, demo..
Allows to provision resource constraints, scaling and high availability.
It all depends on the use case.Hope this helps.
References :
https://developers.redhat.com/blog/2016/12/09/spring-cloud-for-microservices-compared-to-kubernetes/
http://blog.christianposta.com/microservices/netflix-oss-or-kubernetes-how-about-both/
What's the best practice to set-up SCDF server for Failover? I am talking about SCDF server itself. Not the stream and Tasks that you deploy in SCDF. I am planning to use Kubernetes as the runtime.
Depending on the runtime platform of your choice, you can scale multiple SCDF server instances and with a load-balancer in front, you'd be able to route the traffic among server instances. The idea is that you'd have a backup (server) instance to serve the traffic under failure scenarios.
That said, in Kubernetes, the replication controller keeps track of the pod that's running the SCDF server and upon failure, it automatically creates a new pod to re-establish the server operation, anyway.
Similar capability is also available for PCF, Mesos, and Yarn implementations of SCDF.
Currently I can see that Spring Cloud Data Flow has these servers: Local, YARN, Cloud Foundry, Mesos, and Kubernetes; is there any plan for Swarm support?
Caleb: Spring Cloud Data Flow's deployer implementation is based on Spring Cloud Deployer's service provider interface (SPI), so there's currently SPI implementation for Local, CF, Yarn, Kubernetes, and Mesos. These implementations are managed in separate repos, too.
This decoupling provides flexibility and it is easy to extend to add new deployers. Though we haven't attempted to add Docker Swarm deployer yet, we would love to review contributions from the community.