DevOps Classroom notes 08/Jul/2025

Pods contd

Dealing with environmental variables

• container

docker run -d --name mysqldb \
     -e MYSQL_ROOT_PASSWORD=qtdevops \
     -e MYSQL_DATABASE=nop \
     -e MYSQL_USER=qtdevops \
     -e MYSQL_PASSWORD=qtdevops \
     mysql:latest

• Activity 4: lets try writing a manifest to create a mysql container in a Pod

---
apiVersion: v1
kind: Pod
metadata:
  name: forth
spec:
  containers:
    - name: mysql
      image: mysql:latest
      env:
        - name: MYSQL_ROOT_PASSWORD
          value: qtdevops
        - name: MYSQL_USER
          value: qtdevops
        - name: MYSQL_PASSWORD
          value: qtdevops
        - name: MYSQL_DATABASE
          value: nop

Dealing with commands or entrypoints

• Certain containers we might need to pass a CMD

docker run -d --name test alpine sleep 1d

• Lets try writing a manifest for this

---
apiVersion: v1
kind: Pod
metadata:
  name: fifth
spec:
  containers:
    - name: alp
      image: alpine
      args:
        - sleep
        - 1d

Resources in kuberntes

• Refer Here for resources and limits
• A pod With resources defined has an impact on QoS

---
apiVersion: v1
kind: Pod
metadata:
  name: second
spec:
  containers:
    - name: first
      image: nginx
    - name: second
      image: alpine
      command:
        - sleep
        - 1d