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Incorporating data management into your Continuous Deployment workflows and GitOps model
This is a very simple example of how we can integrate Kasten K10 with ArgoCD. It's voluntary kept very simple because we focus on using kasten with a pre-sync phase in ArgoCD.
First let us confirm that we do not have a namespace called mysql as this will be created within ArgoCD
We create a mysql app for sterilisation of animals in a pet clinic.
This app is deployed with Argo CD and is made of :
A mysql deployment
A PVC
A secret
A service to mysql
This is the URL required for ArgoCD - https://github.com/MichaelCade/argocd-kasten.git
We also use a pre-sync job (with corresponding sa and rolebinding)to backup the whole application with kasten before application sync.
At the first sync an empty restore point should be created.
Phase 2 - Adding Data
Vets are creating the row of the animal they will operate.
mysql_pod=$(kubectl get po -n mysql -l app=mysql -o jsonpath='{.items[*].metadata.name}')
kubectl exec -ti $mysql_pod -n mysql -- bash
mysql --user=root --password=ultrasecurepassword
CREATE DATABASE test;
USE test;
CREATE TABLE pets (name VARCHAR(20), owner VARCHAR(20), species VARCHAR(20), sex CHAR(1), birth DATE, death DATE);
INSERT INTO pets VALUES ('Puffball','Diane','hamster','f','2021-05-30',NULL);
INSERT INTO pets VALUES ('Sophie','Meg','giraffe','f','2021-05-30',NULL);
INSERT INTO pets VALUES ('Sam','Diane','snake','m','2021-05-30',NULL);
INSERT INTO pets VALUES ('Medor','Meg','dog','m','2021-05-30',NULL);
INSERT INTO pets VALUES ('Felix','Diane','cat','m','2021-05-30',NULL);
INSERT INTO pets VALUES ('Joe','Diane','crocodile','f','1984-05-30',NULL);
INSERT INTO pets VALUES ('Vanny','Veeam Vanguards','vulture','m','2019-05-30',NULL);
SELECT * FROM pets;
exit
exit
Phase 3 - ConfigMaps + Data
We create a config map that contains the list of species that won't be eligible for sterilisation. This was decided based on the experience of this clinic, operation on this species are too expansive. We can see here a link between the configuration and the data. It's very important that configuration and data are captured together.
When deploying the app with Argo Cd we can see that a second restore point has been created
Phase 4 - The failure scenario
At this stage of our application we want to remove all the rows that have species in the list, for that we use a job that connects to the database and that deletes the rows.
But we made a mistake in the code and we accidentally delete other rows.
Notice that we use the wave 2 argocd.argoproj.io/sync-wave: "2" to make sure this job is executed after the kasten job.
cat <<EOF > migration-data-job.yaml
apiVersion: batch/v1
kind: Job
metadata:
name: migration-data-job
annotations:
argocd.argoproj.io/hook: PreSync
argocd.argoproj.io/sync-wave: "2"
spec:
template:
metadata:
creationTimestamp: null
spec:
containers:
- command:
- /bin/bash
- -c
- |
#!/bin/bash
# Oh no !! I forgot to the "where species in ${SPECIES}" clause in the delete command :(
mysql -h mysql -p\${MYSQL_ROOT_PASSWORD} -uroot -Bse "delete from test.pets"
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
key: mysql-root-password
name: mysql
- name: SPECIES
valueFrom:
configMapKeyRef:
name: forbidden-species
key: species
image: docker.io/bitnami/mysql:8.0.23-debian-10-r0
name: data-job
restartPolicy: Never
EOF
git add migration-data-job.yaml
git commit -m "migrate the data to remove the forbidden species from the database, oh no I made a mistake, that will remove all the species !!"
git push
now head on back to ArgoCD and sync again and see what damage it has done to our database.
Lets now take a look at the database state after making the mistake
mysql_pod=$(kubectl get po -n mysql -l app=mysql -o jsonpath='{.items[*].metadata.name}')
kubectl exec -ti $mysql_pod -n mysql -- bash
mysql --user=root --password=ultrasecurepassword
USE test;
SELECT * FROM pets;
Phase 5 - The Recovery
At this stage we could roll back our ArgoCD to our previous version, prior to Phase 4 but you will notice that this just brings back our configuration and it is not going to bring back our data!
Fortunately we can use kasten to restore the data using the restore point.
You will see from the above now when we check the database our data is gone! It was lucky that we have this presync enabled to take those backups prior to any code changes. We can now use that restore point to bring back our data.
Lets now take a look at the database state after recovery
mysql_pod=$(kubectl get po -n mysql -l app=mysql -o jsonpath='{.items[*].metadata.name}')
kubectl exec -ti $mysql_pod -n mysql -- bash
mysql --user=root --password=ultrasecurepassword
USE test;
SELECT * FROM pets;
Phase 6 - Making things right
We have rectified our mistake in the code and would like to correctly implement this now into our application.
cat <<EOF > migration-data-job.yaml
apiVersion: batch/v1
kind: Job
metadata:
name: migration-data-job
annotations:
argocd.argoproj.io/hook: PreSync
argocd.argoproj.io/sync-wave: "2"
spec:
template:
metadata:
creationTimestamp: null
spec:
containers:
- command:
- /bin/bash
- -c
- |
#!/bin/bash
# Oh no !! I forgot to the "where species in ${SPECIES}" clause in the delete command :(
mysql -h mysql -p\${MYSQL_ROOT_PASSWORD} -uroot -Bse "delete from test.pets where species in \${SPECIES}"
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
key: mysql-root-password
name: mysql
- name: SPECIES
valueFrom:
configMapKeyRef:
name: forbidden-species
key: species
image: docker.io/bitnami/mysql:8.0.23-debian-10-r0
name: data-job
restartPolicy: Never
EOF
git add migration-data-job.yaml
git commit -m "migrate the data to remove the forbidden species from the database, oh no I made a mistake, that will remove all the species !!"
git push
Lets now take a look at the database state and make sure we now have the desired outcome.
mysql_pod=$(kubectl get po -n mysql -l app=mysql -o jsonpath='{.items[*].metadata.name}')
kubectl exec -ti $mysql_pod -n mysql -- bash
mysql --user=root --password=ultrasecurepassword
USE test;
SELECT * FROM pets;
At this stage you will have your desired data in your database but peace of mind that you have a way of recovering if this accident happens again.
Clean Up
If you are using this as a demo then you may now want to clean up your environment to run this multiple times. You can do this by following the next steps.
Delete App from ArgoCD in the UI - There will also be a way to remove from ArgoCLI but I have not had chance to find this yet.
How active is development on MichaelCade/argocd-kasten?
The most recent commit recorded on MichaelCade/argocd-kasten was 4.4 years ago, based on the GitHub push timestamp. The repository has 16 forks — one of the better signals of community interest.
How many stars does MichaelCade/argocd-kasten have?
MichaelCade/argocd-kasten has 10 GitHub stars — refresh the page for the live number, or check github.com/MichaelCade/argocd-kasten. TopGit mirrors GitHub's count but does not claim minute-by-minute accuracy.
Is MichaelCade/argocd-kasten open source?
Yes — MichaelCade/argocd-kasten ships under the Apache-2.0 license, which makes its source code freely readable (and, depending on license terms, forkable and reusable). Source: github.com/MichaelCade/argocd-kasten.
What is MichaelCade/argocd-kasten?
MichaelCade/argocd-kasten (MichaelCade/argocd-kasten) is a multi-language project tracked by TopGit. The repository has 10 GitHub stars at the time of our last sync.
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