Skip to content

Latest commit

 

History

History
214 lines (188 loc) · 10.2 KB

k8ssandra.md

File metadata and controls

214 lines (188 loc) · 10.2 KB
layout title description permalink
default
K8ssandra
A blog all about K8ssandra
/k8ssandra/

What is K8ssandra?


Kubernetes + Cassandra = k8ssandra: the best database on kubernetes...

For now do some reasearch:

Branching

| Website | Community | Github Repo | Docs |

 

How To: Deploy a docker app in k8ssandra

For an upcoming hackathon I needed a framework and foundation to deploy a new app in a k8ssandra cluster. To create this foundation I used the basics I learned in my MemgeGen Project (see below) to create a new k8ssandra-docker repo.

My GitHub repo useful to deploy a docker app in k8ssandra.

GitHub Repo: k8ssandra-docker

Check out my k8ssandra MemeGen Project

I have been working on Meme Generator demos with a partner and this latest one is a full k8ssandra platform running the app with cassandra 4.0 backend. In order to provide a backend interface for this web app I built a simple /api/ with php. The /api/ originated from jeromatron repo astra-php-bank which is a sample of php auth mechanism and curl to communicate with astra. I dev'd this on Astra for awhile before migrating it to Cassandra 4.0 + Stargate in k8ssandra. Stay tuned here as this becomes a more official project and associated assets.

My GitHub repo for the SADA + Datastax Meme Generator demo.

GitHub Repo: MemesGen

k8ssandra How Tos and More

I will use this page to make small articles and as I build them out will break them up into sub pages similar to other blog sections. For now I am going to just drop interesting content sections in here that some of my guys have helped me resolve. It was quite a fun task going from the documented k8ssandra cluster and external docker app to having everything inside the k8ssandra cluster and fully automated role out.

How do you list the k8s pod environment variables?

While working on my app I needed a way to ship environment variables from k8ssandra environment to the applicaton. This is done by mapping the env object in the deployment.yaml as such:

        env:
          - name: KEYSPACE
            value: "memegen2"
          - name: K8S_USERNAME
            valueFrom:
              secretKeyRef:
                name: k8ssandra-superuser 
                key: username
          - name: K8S_PASSWORD
            valueFrom: 
              secretKeyRef:
                name: k8ssandra-superuser 
                key: password               
          - name: K8S_AUTH_URL
            value: "http://k8ssandra-dc1-stargate-service:8081/v1/auth"
          - name: STARGATE_URL
            value: "http://k8ssandra-dc1-stargate-service:8082"
          - name: GRAPHQL_URL
            value: "http://k8ssandra-dc1-stargate-service:8080/graphql/"

💡 Notice there is no instance of a password, ip address, or other idenfiable parameters exposed.

With the deployment sorted I needed to verify the environment variables were available in my pod. I did this by executing printenv as such and making sure my values exist:

kubectl exec -it memegen-v2-545d9d5474-b6qp6 -- sh 
# printenv

KUBERNETES_PORT=tcp://10.43.0.1:443
K8SSANDRA_KUBE_PROMETHEUS_PROMETHEUS_SERVICE_HOST=10.43.79.223
KUBERNETES_SERVICE_PORT=443
K8SSANDRA_REAPER_REAPER_SERVICE_PORT_8080_TCP_PORT=8080
K8SSANDRA_DC1_STARGATE_SERVICE_SERVICE_PORT_HEALTH=8084
K8SSANDRA_REAPER_REAPER_SERVICE_PORT_8080_TCP_PROTO=tcp
KEYSPACE=memegen2
K8SSANDRA_KUBE_PROMETHEUS_PROMETHEUS_PORT_9090_TCP_ADDR=10.43.79.223
HOSTNAME=memegen-v2-545d9d5474-b6qp6
K8SSANDRA_KUBE_PROMETHEUS_OPERATOR_PORT=tcp://10.43.220.53:443
K8SSANDRA_KUBE_PROMETHEUS_OPERATOR_SERVICE_PORT=443
K8SSANDRA_REAPER_REAPER_SERVICE_SERVICE_PORT=8080
K8SSANDRA_REAPER_REAPER_SERVICE_PORT=tcp://10.43.235.8:8080
K8SSANDRA_KUBE_PROMETHEUS_PROMETHEUS_PORT_9090_TCP_PORT=9090
HOME=/root
STARGATE_URL=http://k8ssandra-dc1-stargate-service:8082
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_9042_TCP_ADDR=10.43.22.217
K8SSANDRA_KUBE_PROMETHEUS_PROMETHEUS_PORT_9090_TCP_PROTO=tcp
CASS_OPERATOR_METRICS_SERVICE_PORT_HTTP_METRICS=8383
K8S_AUTH_URL=http://k8ssandra-dc1-stargate-service:8081/v1/auth
K8SSANDRA_DC1_STARGATE_SERVICE_SERVICE_HOST=10.43.22.217
K8SSANDRA_KUBE_PROMETHEUS_PROMETHEUS_SERVICE_PORT=9090
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8080_TCP_ADDR=10.43.22.217
CASS_OPERATOR_METRICS_SERVICE_HOST=10.43.140.23
K8SSANDRA_KUBE_PROMETHEUS_PROMETHEUS_PORT=tcp://10.43.79.223:9090
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8081_TCP_ADDR=10.43.22.217
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8082_TCP_ADDR=10.43.22.217
K8SSANDRA_REAPER_REAPER_SERVICE_PORT_8080_TCP=tcp://10.43.235.8:8080
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_9042_TCP_PORT=9042
K8S_USERNAME=k8ssandra-superuser
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_9042_TCP_PROTO=tcp
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8080_TCP_PORT=8080
GRAPHQL_URL=http://k8ssandra-dc1-stargate-service:8080/graphql/
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8081_TCP_PORT=8081
K8SSANDRA_GRAFANA_SERVICE_HOST=10.43.100.226
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8084_TCP_ADDR=10.43.22.217
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8080_TCP_PROTO=tcp
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8085_TCP_ADDR=10.43.22.217
K8SSANDRA_KUBE_PROMETHEUS_PROMETHEUS_SERVICE_PORT_WEB=9090
K8SSANDRA_DC1_STARGATE_SERVICE_SERVICE_PORT_GRAPHQL=8080
K8SSANDRA_REAPER_REAPER_SERVICE_SERVICE_PORT_APP=8080
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8081_TCP_PROTO=tcp
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8082_TCP_PORT=8082
CASS_OPERATOR_METRICS_PORT_8383_TCP_ADDR=10.43.140.23
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8082_TCP_PROTO=tcp
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8084_TCP_PORT=8084
CASS_OPERATOR_METRICS_PORT=tcp://10.43.140.23:8383
K8SSANDRA_DC1_STARGATE_SERVICE_PORT=tcp://10.43.22.217:8080
K8SSANDRA_KUBE_PROMETHEUS_PROMETHEUS_PORT_9090_TCP=tcp://10.43.79.223:9090
CASS_OPERATOR_METRICS_SERVICE_PORT=8383
K8SSANDRA_DC1_STARGATE_SERVICE_SERVICE_PORT=8080
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8085_TCP_PORT=8085
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8084_TCP_PROTO=tcp
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8085_TCP_PROTO=tcp
CASS_OPERATOR_METRICS_PORT_8383_TCP_PORT=8383
CASS_OPERATOR_METRICS_PORT_8383_TCP_PROTO=tcp
TERM=xterm
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_9042_TCP=tcp://10.43.22.217:9042
K8SSANDRA_GRAFANA_PORT=tcp://10.43.100.226:80
K8SSANDRA_GRAFANA_SERVICE_PORT=80
K8SSANDRA_GRAFANA_SERVICE_PORT_SERVICE=80
KUBERNETES_PORT_443_TCP_ADDR=10.43.0.1
CASS_OPERATOR_METRICS_PORT_8686_TCP_ADDR=10.43.140.23
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8080_TCP=tcp://10.43.22.217:8080
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
K8SSANDRA_DC1_STARGATE_SERVICE_SERVICE_PORT_METRICS=8085
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8081_TCP=tcp://10.43.22.217:8081
K8SSANDRA_KUBE_PROMETHEUS_OPERATOR_PORT_443_TCP_ADDR=10.43.220.53
KUBERNETES_PORT_443_TCP_PORT=443
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8082_TCP=tcp://10.43.22.217:8082
CASS_OPERATOR_METRICS_PORT_8686_TCP_PORT=8686
KUBERNETES_PORT_443_TCP_PROTO=tcp
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8084_TCP=tcp://10.43.22.217:8084
CASS_OPERATOR_METRICS_PORT_8686_TCP_PROTO=tcp
K8SSANDRA_DC1_STARGATE_SERVICE_SERVICE_PORT_CASSANDRA=9042
K8SSANDRA_KUBE_PROMETHEUS_OPERATOR_PORT_443_TCP_PORT=443
K8SSANDRA_GRAFANA_PORT_80_TCP_ADDR=10.43.100.226
K8SSANDRA_DC1_STARGATE_SERVICE_PORT_8085_TCP=tcp://10.43.22.217:8085
DEBIAN_FRONTEND=noninteractive
CASS_OPERATOR_METRICS_PORT_8383_TCP=tcp://10.43.140.23:8383
K8SSANDRA_KUBE_PROMETHEUS_OPERATOR_PORT_443_TCP_PROTO=tcp
K8SSANDRA_DC1_STARGATE_SERVICE_SERVICE_PORT_AUTHORIZATION=8081
K8SSANDRA_GRAFANA_PORT_80_TCP_PORT=80
K8SSANDRA_GRAFANA_PORT_80_TCP_PROTO=tcp
K8S_PASSWORD=OydXi6iO4MEUUqODGAC3
KUBERNETES_SERVICE_PORT_HTTPS=443
KUBERNETES_PORT_443_TCP=tcp://10.43.0.1:443
CASS_OPERATOR_METRICS_SERVICE_PORT_CR_METRICS=8686
CASS_OPERATOR_METRICS_PORT_8686_TCP=tcp://10.43.140.23:8686
KUBERNETES_SERVICE_HOST=10.43.0.1
PWD=/
K8SSANDRA_KUBE_PROMETHEUS_OPERATOR_SERVICE_PORT_HTTPS=443
K8SSANDRA_KUBE_PROMETHEUS_OPERATOR_PORT_443_TCP=tcp://10.43.220.53:443
K8SSANDRA_KUBE_PROMETHEUS_OPERATOR_SERVICE_HOST=10.43.220.53
K8SSANDRA_REAPER_REAPER_SERVICE_PORT_8080_TCP_ADDR=10.43.235.8
K8SSANDRA_REAPER_REAPER_SERVICE_SERVICE_HOST=10.43.235.8
K8SSANDRA_GRAFANA_PORT_80_TCP=tcp://10.43.100.226:80
K8SSANDRA_DC1_STARGATE_SERVICE_SERVICE_PORT_REST=8082

⚠️ I left this full list so that I can come back later and begin to use this env variables where they can be useful.

What's Next?

Stay tuned here as I will be writing short articles as I finish this project, use k8ssandra for other projects, and continue to learn both kubernetes and k8ssandra.

{% include kubernetes_help.html %}