New sample app for OADP

• I'll note most of this was lifted from: https://github.com/sdil/learning/blob/master/go/todolist-mysql-go/todolist.go

Local Setup

• Get mariadb running

docker/podman run -d -p 3306:3306 --name mariadb -e MYSQL_ROOT_PASSWORD=root mariadb
docker/podman exec -it mariadb mariadb -uroot -proot -e 'CREATE DATABASE todolist'
podman exec -it mariadb mariadb -uroot -proot -e "CREATE USER 'test'@'%' IDENTIFIED BY 'test';"
podman exec -it mariadb mariadb -uroot -proot -e "GRANT ALL PRIVILEGES ON todolist.* TO 'test';" 

Note: Mariadb password settings:

• localhost

dsn := "test:test@tcp(127.0.0.1:3306)/todolist?charset=utf8mb4&parseTime=True&loc=Local"

• As deployed on OpenShift with templates

dsn := "changeme:changeme@tcp(mysql:3306)/todolist?charset=utf8mb4&parseTime=True&loc=Local"

• Get the app running

go mod tidy

Execute:

go run todolist.go

Navigate your browser to:

• http://localhost:8000
• http://fqdn

Show items in the db:

Server version: 10.5.9-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
| todolist           |
+--------------------+
5 rows in set (0.001 sec)

MariaDB [(none)]> use todolist;
Database changed
MariaDB [todolist]> show tables;
+--------------------+
| Tables_in_todolist |
+--------------------+
| todo_item_models   |
+--------------------+
1 row in set (0.001 sec)

MariaDB [todolist]> select * from todo_item_models;
+----+-------------------------+-----------+
| id | description             | completed |
+----+-------------------------+-----------+
|  1 | time to make the donuts |         0 |
|  2 | prepopulate the db      |         1 |
+----+-------------------------+-----------+
2 rows in set (0.000 sec)

MariaDB [todolist]>

Deploy to OpenShift

oc create -f mysql-persistent-template.yaml
OR
oc create -f mysql-persistent-csi-template.yaml -f pvc/$cloud.yaml 

testing

There are some basic curl and python tests in the tests directory where you can see the api is exercised and the database is populated.

cd tests
python test.py

building

Build for release:

./build.sh

Build a new container: Here's a quick example

podman build  -t quay.io/rhn_engineering_whayutin/todolist-mariadb-go-2 .
podman push

build for multi-arch

https://developers.redhat.com/articles/2023/11/03/how-build-multi-architecture-container-images#benefits_of_multi_architecture_containers

Build a VM w/ the todolist installed directly on the VM w/o containers

• Note: this was tested with Fedora 39

  • Fedora-Cloud-Base-39-1.5.x86_64.qcow2

• get a RHEL, CentOS, or Fedora VM image.

• copy the qcow2 to /var/lib/libvirt/images

• update the cloud-init/todolist-data file with your public ssh keys

ssh-authorized-keys:
   - ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPIXu6mcNuozbbovc7PLAQAgJFC3VcV4B9Z/mc089Ofv [email protected]

• copy the cloud-init/todolist-data to /var/lib/libvirt/boot/cloud-init/

• sample virt-install

clear; sudo virt-install --name todolist-mariadb-1  --memory memory=3072  --cpu host --vcpus 2  --graphics none  --os-variant fedora39  --import  --disk /var/lib/libvirt/images/Fedora-Cloud-Base-39-1.5.x86_64.qcow2,format=qcow2,bus=virtio  --disk size=8 --network type=network,source=default,model=virtio  --cloud-init user-data=/var/lib/libvirt/boot/cloud-init/todolist-data

• wait for both the install and cloud-init to finish.

• browse to the vm ip and port: http://192.168.122.113:8000/ for example

• If the cloud-init fails, test w/

sudo cloud-init schema --system

updates

• Note that the app will NO longer create two items in the the todo list at start up.