Entwicklung Archives - Page 6 of 13

Easily remember ManyToMany ManyToOne OneToMany

14. March 2022 | 1 min read

ManyToMany in a Person Blog Relationship A Person can be a subscriber of many blogs. A Blog can have many subscribers.

const Person = {
  isSubscriberOfBlogs: []
}
const Blog = {
  subscribers = []
}

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const Person = {

isSubscriberOfBlogs: []

}

const Blog = {

subscribers = []

}

But since this is an inefficient way to manage usually a proxy table is used with [PersonID], [BlogID], aka the 2 related data models. ManyToOne and OneToMany in a Person Blog Relationship A…

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Vue composition api: ensure variable is not null

11. March 2022 | 1 min read

I ran into a problem where I was loading data from the backend in App.vue and when loaded that data would be inserted into a vuex store and in another component queried. However the loading took longer than expected and a data race happened. The route destination rendered faster than the backend could deliver data…

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Why do I need microservices?

21. February 2022 | 3 min read

Microservices are supposed to solve the scaling problem. Aka the solution to a monolith only being able to handle so many requests / second is microservices that potentially have replicas.

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Upgrade Keycloak Standalone with Postgres from 16.1.0 to 17.0.0 with custom port behind nginx reverse proxy

17. February 2022 | 1 min read

What a nightmare. You’re using keycloak and are upgrading from Wildfly 16.1.0 to Quarkus 17.0.0. You’re also listening on a non-standard port, that isn’t 8080, but 23232. You’re using a reverse proxy like nginx for TLS and Keycloak is connected via plain http with nginx. Grab your standalone.xml found in /standalone/configuration/standalone.xml and find your postgres…

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centos 7 & mysql 5.7 gpg key error proper solution

23. January 2022 | 3 min read

If you’re running CentOS7 and using the MySQL 5.7 community rpm package you might’ve ran into this error response:

Downloading packages:
warning: /var/cache/yum/x86_64/7/mysql57-community/packages/mysql-community-libs-5.7.37-1.el7.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID 3a79bd29: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql


The GPG keys listed for the "MySQL 5.7 Community Server" repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.


 Failing package is: mysql-community-libs-5.7.37-1.el7.x86_64
 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

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Downloading packages:

warning: /var/cache/yum/x86_64/7/mysql57-community/packages/mysql-community-libs-5.7.37-1.el7.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID 3a79bd29: NOKEY

Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

The GPG keys listed for the "MySQL 5.7 Community Server" repository are already installed but they are not correct for this package.

Check that the correct key URLs are configured for this repository.

Failing package is: mysql-community-libs-5.7.37-1.el7.x86_64

GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

Seems like Oracle has changed their GPG key and it’s not uploaded to gpg servers yet, at least yum can’t find the new key. So you have to manually replace your key. Disabling gpgcheck is…

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