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4mirul/docker-basic.md

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  1. 4mirul renamed this gist Feb 20, 2023. 1 changed file with 0 additions and 0 deletions.
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    ‎‎​
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    [link](https://www.fosstechnix.com/dockerfile-instructions/)

    ```.md
    ```txt
    #1: FROM –
    FROM in Dockerfile Instruction used to specify Docker Image Name and start the build process
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    [link](https://www.fosstechnix.com/dockerfile-instructions/)

    ```md
    ```.md
    #1: FROM –
    FROM in Dockerfile Instruction used to specify Docker Image Name and start the build process
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    [link](https://www.fosstechnix.com/dockerfile-instructions/)

    ```.md
    ```md
    #1: FROM –

    FROM in Dockerfile Instruction used to specify Docker Image Name and start the build process
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    [link](https://www.fosstechnix.com/dockerfile-instructions/)

    ```md
    ```.md
    #1: FROM –
    FROM in Dockerfile Instruction used to specify Docker Image Name and start the build process
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    # Dockerfile Instructions with Examples

    [link](https://www.fosstechnix.com/dockerfile-instructions/)

    ```md
    #1: FROM –

    FROM in Dockerfile Instruction used to specify Docker Image Name and start the build process

    Example 1:

    #specify a Base Image

    FROM ubuntu:latest

    Example 2:

    #specify a Base Image

    FROM node:12

    #2: MAINTAINER –

    MAINTAINER in Dockerfile Instruction is used to about the person who creates the Docker Image

    Example:

    MAINTAINER support@fosstechnix.com

    #3: CMD –

    CMD in Dockerfile Instruction is used to execute a command in Running container, There should be one CMD in a Dockerfile.

    CMD executes the commands when your Docker Image is deployed.

    Example 1:

    # To run apache2 in foreground

    CMD ["/usr/sbin/apache2", "-D", "FOREGROUND"]

    Example 2:

    FROM ubuntu:latest
    CMD /bin/bash

    #4: RUN –

    RUN in Dockerfile Instruction is used to execute any commands on top of current Docker Image

    RUN executes the command when you are building Image.

    Example 1:

    FROM ubuntu:latest
    MAINTAINER support@fosstechnix.com
    RUN apt-get update
    RUN apt-get install -y apache2

    If you want to run .sh(shell script) file inside Dockerfile

    COPY test.sh .
    RUN ./test.sh
    #OR
    RUN /path/to/test.sh

    #5: LABEL –

    LABEL in Dockerfile Instruction is used to specify metadata information of Docker Image.

    Example:

    FROM ubuntu:latest
    LABEL "author"="FOSS TechNIx"
    LABEL "Date"="2020-09-29"

    #6: EXPOSE –

    EXPOSE in Dockerfile Instruction is used to specify Network port for Docker container

    Example 1:

    # To Expose port 80 of Docker container

    EXPOSE 80

    Example 2:

    EXPOSE 8080/tcp

    #7: ENV –

    ENV in Dockerfile Instruction is used to set Environment Variables with key and value.

    Example 1:

    FROM node:12
    ENV workdirectory /usr/node

    #8: ADD –

    ADD: Copies a file and directory from your host to Docker image, however can also fetch remote URLs, extract TAR/ZIP files, etc. It is used downloading remote resources, extracting TAR/ZIP files.

    Syntax:

    ADD <source>... <destination>

    Example 1:

    ADD java/jdk-8u231-linux-x64.tar /opt/jdk/

    Example 2:

    ADD https://fosstechnix.com/test.tar.xz /home/ubuntu/test/

    #9: COPY –

    COPY in Dockerfile Instruction used to Copies a file or directory from your host to Docker image, It is used to simply copying files or directories into the build context.

    Syntax:

    COPY <source>... <destination>

    Example 1:

    # To Install All dependencies for Node.js App

    COPY package\*.json ./

    RUN npm install

    # To copy all application packages

    COPY . .

    Example 2:

    COPY index.html /var/www/html

    #10: ENTRYPOINT –

    ENTRYPOINT in Dockerfile Instruction is used you to configure a container that you can run as an executable.

    ENTRYPOINT specifies a commands that will executes when the Docker container starts.

    Example 1:

    FROM ubuntu:latest

    ENTRYPOINT ["ls"]

    #11: VOLUME –

    VOLUME in Dockerfile Instruction is used to create or mount volume to docker container.

    Example 1:

    FROM node:12
    RUN mkdir /node
    WORKDIR /node
    RUN echo "Welcome to Node.js" > node
    VOLUME /node

    #12: USER –

    USER in Dockerfile Instruction is used to set the user name and UID when running container

    Example 1:

    USER admin

    To create new user in Dockerfile and login to user.

    Example 2:

    RUN adduser -D admin
    USER admin

    #13: WORKDIR –

    WORKDIR in Dockerfile Instruction is used to set the working directory.

    Example 1:

    # To Create nodejsapp directory

    WORKDIR /nodejsapp

    #14: ARG –

    ARG in Dockerfile Instruction is used to set Environment variables with key and value during the image build .

    Example 1:

    ARG JAVA_PATH=/opt/jdk/jdk1.8.0_251

    ENV JAVA_HOME ${JAVA_PATH}

    #15: ONBUILD –

    ONBUILD in Dockerfile Instruction is used to specify command that runs when the image in Dockerfile is used as base image for another image.

    Examples 1:

    FROM node:12
    RUN mkdir -p /usr/node/app
    WORKDIR /usr/node/app
    ONBUILD COPY package.json /usr/node/app/
    ONBUILD RUN npm install
    ONBUILD COPY . /usr/node/app
    CMD [ "npm", "start" ]

    #16: STOPSIGNAL –

    STOPSIGNAL in Dockerfile Instruction is used to set the system call signal that will be sent to the container to exit

    Example 1:

    STOPSIGNAL SIGQUIT

    #17: SHELL –

    SHELL in Dockerfile Instruction is used to set the default shell.

    Example:

    SHELL ["/bin/bash", "-c", "echo hello"]

    #18: HEALTHCHECK –

    HEALTHCHECK in Dockerfile Instruction is used to Check container health by running a command inside the container

    Example 1:

    FROM ubuntu:latest
    HEALTHCHECK --interval=60s --timeout=5s \
    CMD curl -f http://fosstechnix.info/ || exit 1
    EXPOSE 80

    #19: .dockerignore –

    .dockerignore in Dockerfile Instruction is used to prevent copy local modules and other unwanted file being copied into Docker Image.

    Create a .dockerignore in same directory and you can add unwanted modules/files into it.

    sudo nano .dockerignore

    \*.yaml
    **pycache**/
    .git
    .aws
    .env
    ```
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    # Dockerfile example

    [link](https://www.fosstechnix.com/dockerfile-instructions/)
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    ‎‎​
    # Dockerfile example

    [link](https://www.fosstechnix.com/dockerfile-instructions/)
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    # Dockerfile Instructions with Examples

    [link](https://www.fosstechnix.com/dockerfile-instructions/)
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    ‎‎​
    # Dockerfile Instructions with Examples
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    ---

    ### Labels
    ## Labels

    labels goes under `metadata:`. simple list of `key: value` for identifying.

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    ---

    ### cert-manager
    ## cert-manager

    ---

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    - telling services and deploymens which pods are their
    - use label selectors to "link" resource dependencies
    - user labels and selectors to control which pods go to which nodes

    selectors goes under `selector:`
    - selectors goes under `selector:`

    ---

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    - use label selectors to "link" resource dependencies
    - user labels and selectors to control which pods go to which nodes

    selectors goes under `selector:`

    ---

    ## microk8s
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    - telling services and deploymens which pods are their
    - use label selectors to "link" resource dependencies
    - user labels and selectors to control which pods go to which nodes

    ---

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    ### Label Selectores

    - telling services and deploymens which pods are their
    - ***
    - use label selectors to "link" resource dependencies

    ---

    ## microk8s

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    ### Label Selectores

    - telling services and deploymens which pods are their

    -

    ---
    - ***

    ## microk8s

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    `kubectl apply -f <yaml-files> -l <key>=<value>` - apply only matching labels

    ### Label Selectores

    - telling services and deploymens which pods are their

    -

    ---

    ## microk8s
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    `kubectl get pods -l <key>=<value>` - find pods with this label

    ## `kubectl apply -f <yaml-files> -l <key>=<value>` - apply only matching labels
    `kubectl apply -f <yaml-files> -l <key>=<value>` - apply only matching labels

    ---

    ## microk8s

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    `kubectl get pods -l <key>=<value>` - find pods with this label

    ---
    ## `kubectl apply -f <yaml-files> -l <key>=<value>` - apply only matching labels

    ## microk8s

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    ---

    ### Label
    ### Labels

    labels goes under `metadata:`. simple list of `key: value` for identifying.

    `kubectl get pods -l <key>=<value>` - find pods with this label

    ---

    ## microk8s
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    `helm` - [link](https://helm.sh/) k8s package manager

    ---

    ### Label

    labels goes under `metadata:`. simple list of `key: value` for identifying.

    ---

    ## microk8s

    [link](https://microk8s.io/)
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    `kubectl explain <kind>.<key>` - get the key details for that kind

    `kubectl explain <kind>.<key>.<key>` - get the specific key detail for that kind
    `kubectl explain <kind>.<key>.<key>` - get the specific key detail for that key for that kind

    ```yaml
    apiVersion: v1
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    `kubectl explain <kind> --recursive` - get all the keys each that specific kind supports

    `kubectl explain <kind>.spec` - get the key details for that kind
    `kubectl explain <kind>.<key>` - get the key details for that kind

    `kubectl explain <kind>.spec.<key>` - get the specific key detail for that kind
    `kubectl explain <kind>.<key>.<key>` - get the specific key detail for that kind

    ```yaml
    apiVersion: v1