What is the equivalent for depends_on in kubernetes - kubernetes

Question

I have a docker compose file with the following entries
version: '2.1'
services:
mysql:
container_name: mysql
image: mysql:latest
volumes:
- ./mysqldata:/var/lib/mysql
environment:
MYSQL_ROOT_PASSWORD: 'password'
ports:
- '3306:3306'
healthcheck:
test: ["CMD", "curl", "-f", "http://localhost:3306"]
interval: 30s
timeout: 10s
retries: 5
test1:
container_name: test1
image: test1:latest
ports:
- '4884:4884'
- '8443'
depends_on:
mysql:
condition: service_healthy
links:
- mysql
The Test-1 container is dependent on mysql and it needs to be up and running.
In docker this can be controlled using health check and depends_on attributes.
The health check equivalent in kubernetes is readinessprobe which i have already created but how do we control the container startup in the pod's?????
Any directions on this is greatly appreciated.
My Kubernetes file:
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: deployment
spec:
replicas: 1
template:
metadata:
labels:
app: deployment
spec:
containers:
- name: mysqldb
image: "dockerregistry:mysqldatabase"
imagePullPolicy: Always
ports:
- containerPort: 3306
readinessProbe:
tcpSocket:
port: 3306
initialDelaySeconds: 15
periodSeconds: 10
- name: test1
image: "dockerregistry::test1"
imagePullPolicy: Always
ports:
- containerPort: 3000

Answer 1

That's the beauty of Docker Compose and Docker Swarm... Their simplicity.
We came across this same Kubernetes shortcoming when deploying the ELK stack.
We solved it by using a side-car (initContainer), which is just another container in the same pod thats run first, and when it's complete, kubernetes automatically starts the [main] container. We made it a simple shell script that is in loop until Elasticsearch is up and running, then it exits and Kibana's container starts.
Below is an example of a side-car that waits until Grafana is ready.
Add this 'initContainer' block just above your other containers in the Pod:
spec:
initContainers:
- name: wait-for-grafana
image: darthcabs/tiny-tools:1
args:
- /bin/bash
- -c
- >
set -x;
while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' http://grafana:3000/login)" != "200" ]]; do
echo '.'
sleep 15;
done
containers:
.
.
(your other containers)
.
.

Answer 2

This was purposefully left out. The reason being is that applications should be responsible for their connect/re-connect logic for connecting to service(s) such as a database. This is outside the scope of Kubernetes.

Answer 3

While I don't know the direct answer to your question except this link (k8s-AppController), I don't think it's wise to use same deployment for DB and app. Because you are tightly coupling your db with app and loosing awesome k8s option to scale any one of them as needed. Further more if your db pod dies you loose your data as well.
Personally what I would do is to have a separate StatefulSet with Persistent Volume for database and Deployment for app and use Service to make sure their communication.
Yes I have to run few different commands and may need at least two separate deployment files but this way I am decoupling them and can scale them as needed. And my data is being persistent as well!

Answer 4

As mentioned, you should run the database and the application containers in separate pods and connect them with a service.
Unfortunately, both Kubernetes and Helm don't provide a functionality similar to what you've described. We had many issues with that and tried a few approaches until we have decided to develop a smallish utility that solved this problem for us.
Here's the link to the tool we've developed: https://github.com/Opsfleet/depends-on
You can make pods wait until other pods become ready according to their readinessProbe configuration. It's very close to Docker's depends_on functionality.

Answer 5

In Kubernetes terminology one your docker-compose set is a Pod.
So, there is no depends_on equivalent there. Kubernetes will check all containers in a pod and they all have to be alive for a mark that pod as Healthy and will always run them together.
In your case, you need to prepare configuration of Deployment like that:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: my-app
spec:
replicas: 1
template:
metadata:
labels:
app: app-and-db
spec:
containers:
- name: app
image: nginx
ports:
- containerPort: 80
- name: db
image: mysql
ports:
- containerPort: 3306
After pod will be started, your database will be available on localhost interface for your application, because of network conception:
Containers within a pod share an IP address and port space, and can find each other via localhost. They can also communicate with each other using standard inter-process communications like SystemV semaphores or POSIX shared memory.
But, as #leninhasda mentioned, it is not a good idea to run database and application in your pod and without Persistent Volume. Here is a good tutorial on how to run a stateful application in the Kubernetes.

Answer 6

https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/
what about liveness and readiness ??? supports commands, http requests and more
apiVersion: v1
kind: Pod
metadata:
labels:
test: liveness
name: liveness-exec
spec:
containers:
- name: liveness
image: k8s.gcr.io/busybox
args:
- /bin/sh
- -c
- touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600
livenessProbe:
exec:
command:
- cat
- /tmp/healthy
initialDelaySeconds: 5
periodSeconds: 5