class Animal:
    def __init__(self, name):
        self.name = name

    def make_sound(self):
        return "Какой-то звук"

class Dog(Animal):
    def make_sound(self):
        return "Гав-гав"

dog = Dog("Шарик")
print(dog.name)          # Шарик (унаследовано от Animal)
print(dog.make_sound())  # Гав-гав (переопределено в Dog)

apiVersion: v1
kind: ConfigMap
metadata:
  name: my-config
data:
  APP_ENV: "production"
  LOG_LEVEL: "debug"
  CONFIG_FILE: |
    [settings]
    mode = "production"
    debug = true

kubectl create configmap my-config --from-literal=APP_ENV=production --from-literal=LOG_LEVEL=debug

kubectl create configmap my-config --from-file=config.ini

apiVersion: v1
kind: Pod
metadata:
  name: my-app
spec:
  containers:
  - name: app
    image: my-app
    env:
    - name: APP_ENV
      valueFrom:
        configMapKeyRef:
          name: my-config
          key: APP_ENV

apiVersion: v1
kind: Pod
metadata:
  name: my-app
spec:
  containers:
  - name: app
    image: my-app
    volumeMounts:
    - name: config-volume
      mountPath: "/etc/config"
  volumes:
  - name: config-volume
    configMap:
      name: my-config

df -i

  find /path -xdev -type f | wc -l  # Количество файлов в каталоге
  

quota -v

df -hT

mount | grep ' ro,'

  mount -o remount,rw /path
  

  dmesg | tail -20  # Лог ошибок
  fsck /dev/sdX  # Проверка диска
  

ansible-playbook playbook.yml

PLAY [имя_плейбука] *****************************************************

ansible-playbook site.yml

PLAY [Install and configure web server] *********************************

PLAY [Unnamed Play] ****************************************************

{
  "name": "inventory-connector",
  "config": {
    "connector.class": "io.debezium.connector.postgresql.PostgresConnector",
    "database.hostname": "localhost",
    "database.port": "5432",
    "database.user": "debezium",
    "database.password": "dbz",
    "database.dbname": "inventory",
    "database.server.name": "dbserver1"
  }
}

{
  "schema": { ... },
  "payload": {
    "before": { "id": 1, "name": "Old Name" },
    "after": { "id": 1, "name": "New Name" },
    "op": "u"  // Update
  }
}

ADD app.tar.gz /app/

COPY app.tar.gz /tmp/
RUN tar -xzf /tmp/app.tar.gz -C /app && rm /tmp/app.tar.gz

COPY . /app

COPY src/ /app/src/
COPY requirements.txt /app/

.git
node_modules
__pycache__
*.log

COPY . /app
RUN pip install -r /app/requirements.txt

COPY requirements.txt /app/
RUN pip install -r /app/requirements.txt

COPY src/ /app/src/

ADD https://example.com/file.tar.gz /tmp/

RUN curl -L -o /tmp/file.tar.gz https://example.com/file.tar.gz
COPY file.tar.gz /app/

GET /index.html HTTP/1.1  
Host: example.com  
User-Agent: Mozilla/5.0  

docker run alpine ID:

docker run --rm alpine sh -c 'echo $HOSTNAME'

docker ps -q

docker inspect -f '{{.Id}}' container_name