k8s-wait-for
Flyway
k8s-wait-for | Flyway | |
---|---|---|
6 | 81 | |
563 | 7,775 | |
- | 0.6% | |
0.0 | 7.2 | |
about 2 months ago | 12 days ago | |
Shell | Java | |
MIT License | Apache License 2.0 |
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k8s-wait-for
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Managing external database versions in Kubernetes
You would then use an init-container like k8s-wait-for to only launch the new version of the app once the database has been updated.
- k8s-wait-for: A simple script that allows to wait for a k8s service, job or pods to enter a desired state
- How to Start a Pod after ALL others are Running ?
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k8s-wait-for VS docker-k8s-wait-for-it - a user suggested alternative
2 projects | 4 Nov 2021
- Setting up an order in which containers would start
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Rainbow deployments in Kubernetes - is this the best approach for zero-downtime with long running (hours) workloads?
We're using job to run commands as a prerequisite for a deployment (initContainer are not a good fit since we don't want these commands to run on each pod start up). We create a job with a different name (usually the commit hash) and have an initContainer in the deployment running this image: https://github.com/groundnuty/k8s-wait-for
Flyway
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Let's write a simple microservice in Clojure
The session logs show that the application loads configurations and establishes a connection with a PostgreSQL database. This involves initializing a HikariCP connection pool and Flyway for database migrations. The logs confirm that the database schema validation and migration checks were successful. The startup of the Jetty HTTP server follows, and the server becomes operational and ready to accept requests on the specified port.
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Ask HN: What tool(s) do you use to code review and deploy SQL scripts?
Also RedGate, but Flyway has some reasons to recommend it over RedGate Deploy depending on your DBAs/workflows: https://flywaydb.org/
(Though I don't think it is "complete" or "perfect", either.)
EF Migrations are in a really good place now if you like/don't mind C# as a language (and you can easily embed SQL inside the C#, too, but there are benefits to being able to also run high level C# code). With today's tooling you can package your migration "runner application" as a single deployable executable for most platforms. You can build the executable once and run it in all your environments. (The same tool that updates your QA and Staging updates your Prod, testably running the same migrations.) Given the single executable deployable I might even consider using it for projects not themselves written in C#.
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PostgreSQL Is Enough
There is a bit of tooling needed but is already around. For Java for example I had very good experience with a combination of flyway [1] for migrations, testcontainers [2] for making integration tests as easy as unit tests and querydsl [3] for a query and mapping layer.
[1] https://github.com/flyway/flyway
[2] https://java.testcontainers.org/modules/databases/postgres/
[3] https://github.com/querydsl/querydsl
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Using Flyway to version your database
When software starts using a database, it's advisable to have version control, just as we have Github to control our source code. This is all to be sure about what was executed for that specific version. For Java and Spring boot, we have the Flyway framework that aims to resolve this situation, free of charge.
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CI/CD for Databricks
If you're looking for tools, like https://www.liquibase.com/ or https://flywaydb.org/, which are database-state-based schema migration toolkits - it might be relatively straightforward to build similar ones using Databricks SQL drivers.
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Working with jOOQ and Flyway using Testcontainers
Honestly I kind of wish there was a Lukas Eder database migration library. Call it whatever jooq-migration. At least I would have more insight of what is going on (<-- seriously look at the commit history).
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Strategy to run database scripts on Kubernetes
This is a 4th option, which should play nice with ArgoCD. The following example runs flyway as a k8s job. The desired migration changes are recorded as files within the chart. This helm chart can be integrated with your application (Using hooks to determine when the migration job is run) or run manually.
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How do your teams run DB migrations?
By using an opinionated framework within the app/service (like Flyway, Migrate, Diesel, etc). Schema migrations happen on app/service start-up.
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I've never created a production database from scratch and am wondering how much trouble it would be to transition a one-to-one relationship to a one-to-many relationship if I determine at some point that the latter is required.
Depending on the language or platform there are libraries you can use to manage this, such as Prisma on node and Flyway for Java/JVM.
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How should I document and/or automate schema changes?
It's probably overkill but I've used github plus flyway at a couple places in the past which is pretty nice tool for tracking changes to a variety of db's, it's also very helpful if you ever need to replicate a db in a new region/environment.
What are some alternatives?
docker-k8s-wait-for-it - Init container for Kubernetes to ensure a service, pods, or DNS are correctly configured before allowing the other containers in the pod to start.
alembic - A database migrations tool for SQLAlchemy.
k3s-gitops - My home Kubernetes (k3s) cluster managed by GitOps (Flux2) [Moved to: https://github.com/onedr0p/home-cluster]
HikariCP - 光 HikariCP・A solid, high-performance, JDBC connection pool at last.
argo - Workflow Engine for Kubernetes
roundhouse - RoundhousE is a Database Migration Utility for .NET using sql files and versioning based on source control
PIVT - Helm charts for running and operating Hyperledger Fabric in Kubernetes. Previously hosted at https://github.com/APGGroeiFabriek/PIVT.
H2 - H2 is an embeddable RDBMS written in Java.
flux2-kustomize-helm-example - A GitOps workflow example for multi-env deployments with Flux, Kustomize and Helm.
dbmate - :rocket: A lightweight, framework-agnostic database migration tool.
helm-secrets - DEPRECATED A helm plugin that help manage secrets with Git workflow and store them anywhere [Moved to: https://github.com/zendesk/helm-secrets]
Hibernate - Hibernate's core Object/Relational Mapping functionality