docker run ubuntu
docker ps
docker ps -a
Nignx Docker File
# Install Nginx.
RUN \
add-apt-repository -y ppa:nginx/stable && \
apt-get update && \
apt-get install -y nginx && \
rm -rf /var/lib/apt/lists/* && \
echo "\ndaemon off;" >> /etc/nginx/nginx.conf && \
chown -R www-data:www-data /var/lib/nginx
# Define mountable directories.
VOLUME ["/etc/nginx/sites-enabled", "/etc/nginx/certs", "/etc/nginx/
# Define working directory
WORKDIR /etc/nginx
# Define default command/
CMD ["nginx"]
Unbutu Docker File
# Pull base image.
FROM ubuntu:14.04
# Install.
RUN \
sed -i 's/# \(."multiverse$\)/\1/g' /etc/apt/sources.list && \
apt-get update && \
apt-get -y upgrade && \
apt-get install -y build-essential && \
apt-get install -y software-properties-commn && \
apt-get install -y byobu curl git htop man unzip vim wget && \
rm -rf /var/lib/apt/lists/*
# Add files
ADD root/.bashrc /root/.bashrc
ADD root/.gitconfig /root/.gitconfig
ADD root/.scripts /root/.scripts
# Set environment variables.
ENV HOME /root
# Define working directory
WORKDIR /root
# Define working directory
WORKDIR /root
# Define default command
CMD ["bash"]
docker run ubuntu [COMMAND]
docker run ubuntu sleep 5
[sleep]
FROM Ubuntu
CMD sleep 5
docker run --name ubuntu-sleeper ubuntu-sleeper
docker run --name ubuntu-sleepr ubunut-sleeper 10
pod-definition.yml
apiVersion: v1
kind: Pod
metadata:
name: ubuntu-sleeper-pod
spec:
containers:
- name: ubuntu-sleeper
image: ubuntu-sleeper
args: ["10"]
kubectl create -f pod-definition.yml
[sleep2.0]
FROM Ubuntu
ENTRYPOINT ["sleep"]
CMD ["5"]
docker run --name ubuntu-sleeper \
--entrypoint sleep2.0
ubuntu-sleeper 10
apiVersion: v1
kind: Pod
metadata:
name: ubuntu-sleeper-pod
spec:
containers:
- name: ubuntu-sleeper
image: ubuntu-sleeper
command: ["sleep2.0]
args: ["10"]
[Practice Test]
ㅁ How many PODs exist on. the system?
kubectl get pods
ㅁ What is the command used to run the pod 'ubuntu-sleeper'
kubectl get pod ubuntu-sleeper -o yaml
spec.containers.command 부분 확인
또는
kubectl describe pod ubuntu-sleeper
확인
ㅁ Create a pod with the ubuntu image to run a container to sleep for 5000 seconds. Modify the file ubuntu-sleeper-2.yaml
kubectl get pod ubuntu-sleeper -o yaml > ubuntu-sleeper-2.yaml
vi ubuntu-sleeper-2.yaml
Pod Name과 Command sleep 부분 변경
kubectl create -f ubuntu-sleeper-2.yaml
ㅁ Create a pod using the file named 'ubuntu-sleeper-3.yaml'. There is something worng with it. Try to fix it
- Pod NAme: ubuntu-sleeper-3
- Command: sleep 1200
origin ubuntu-sleeper-3.yaml
apiVersion: v1
kind: Pod
metadata:
name: ubuntu-sleeper-3
spec:
containers:
- name: ubuntu
image: ubuntu
command:
- "sleep"
- 1200
modify ubuntu-sleeper-3.yaml
apiVersion: v1
kind: Pod
metadata:
name: ubuntu-sleeper-3
spec:
containers:
- name: ubuntu
image: ubuntu
command:
- sleep
- "1200"
ㅁ Update pod 'ubuntu-sleeper-3' to sleep for 2000 seconds
delete ubuntu-sleeper-3 pod
modify ubuntu-sleeper-3.yaml
create ubunut-sleeper-3 pod
ㅁ Inspect the two files under directory 'webapp-color'. What command is run at container startup?
[nginx]
[Flask run]
[mysqld]
[pytnon app.py]
[sleep 4800]
Dockerfile
FROM python:3.6-alpine
RUN pip install flask
COPY . /opt/
EXPOSE 8080
WORKDIR /opt
ENTRYPOINT ["python", "app.py"]
ㅁ Inspect the two files under directory 'webapp-color-2'. What command is run at container startup?
[python app.py]
[python app.py --color blue]
[python app.py --color red]
Dockerfile2
FROM python:3.6-alpine
RUN pip install flask
COPY . /opt/
EXPOSE 8080
WORKDIR /opt
ENTRYPOINT ["python", "app.py"]
CMD ["--color", "red"]
ㅁ Inspect the two files under directory 'webapp-color-2'. What command is run at container startup?
Assume the image was created from the Dockerfile in this folder
[python app.py --color red]
[python app.py --color green]
[--color green]
[python app.py]
Dockerfile2
FROM python:3.6-alpine
RUN pip install flask
COPY . /opt/
EXPOSE 8080
WORKDIR /opt
ENTRYPOINT ["python", "app.py"]
CMD ["--color", "red"]
webapp-color-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: webapp-green
labels:
name: webapp-green
spec:
containers:
- name: simple-webapp
image: kodekloud/webapp-color
command: ["--color","green"]
container 시작시에 dockers는 CMD를
--color, green
으로 override 됨
ㅁ Inspect the two files under directory 'webapp-color-3'. What command is run at container startup?
[python app.py --color green]
[python app-py]
[--color pink]
[python app.py --color pink]
Docker File
FROM python:3.6-alpine
RUN pip install flask
COPY . /opt/
EXPOSE 8080
WORKDIR /opt
ENTRYPOINT ["python", "app.py"]
CMD ["--color", "red"]
webapp-color-pod-2.yaml
apiVersion: v1
kind: Pod
metadata:
name: webapp-green
labels:
name: webapp-green
spec:
containers:
- name: simple-webapp
image: kodekloud/webapp-color
command: ["python", "app.py"]
args: ["--color", "pink"]
ㅁ Create a pod with the given specifications. By default it displays a 'blue' background. set the given command line arguments to change it to 'green
- Pod Name: webapp-green
- Image: kodekloud/webapp-color
- Command line arguments: --color=green
kubectl run webapp-green --image=kodekloud/webapp-color --dry-run -o yaml > pod-definition.yaml
pod-definition.yaml에 아래 내용 추가
apiVersion: v1
kind: Pod
metadata:
name: webapp-green
labels:
name: webapp-green
spec:
containers:
- name: webapp-green
image: Kodekloud/webapp-color
args:["--color=green"]
kubectl create -f pod-definition.yaml
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