Important short commands for docker - (Docker mocker çalışır!)

Docker short commands.md

Run and build docker project

docker-compose -f docker-compose.yml up --build

Docker Build and Deployment

# docker build -t template_name:version_tag .
docker build -t micro_service:1.2.1 .

Then change version tag in yaml file

nano micro_service.yml

Then deploy the image using:

docker stack deploy -c micro_service.yml prod1

to declare external network called network_name, by creating a swarm-scoped network before stack deployed

docker network create --driver overlay network_name

to update services under mirco_service.yml file

docker service update --force prod1_web
docker service update --force prod1_celery
docker service update --force prod1_redis

to scale service without restarting:

docker service scale prod1_web=0

to check the services status:

docker service ls | grep prod1

to remove service prod1_celery use:

docker service rm prod1_celery

to check docker servce process

docker service ps <service_id> --no-trunc

to check docker processes use:

docker ps | grep prod1
# then you will see list of processes

to check docker processes in pretty format:

docker ps -a --format 'table {{.ID}}\t{{.Image}}\t{{.Status}}\t{{.Ports}}'

to check process log

docker logs -f --tail 20 <container_id>

to log into docker container as ssh:

docker exec -ti <container_id> bash

Connect Container to localmachine like localhost:

For example to connect container service flask_app to your localhost postgresql, on your local machine try this command

ip addr show docker0

you will see output like this:

docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:4f:cd:6c:06 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever

you neet to grap IP network 172.17.0.1/16 and set it on white list in pg_hba.conf as:

host    all             all             172.19.0.0/16           md5
host    all             all             172.18.0.0/16           md5
host    all             all             172.17.0.0/16           md5
host    all             all             127.0.0.1/32            md5

and postgresql.conf as:

listen_addresses = '*'

on docker_local_env file:

DATABASE_HOST=172.17.0.1

source: here

check your docker_gwbridge on server using command: ip a

if your ufw enabled make sure you have docker_gwbridge allowed on it

ufw allow from 172.18.0.0/16 proto tcp to any port 5432

Save and Load Docker Image Offline

The problem is how to copy Docker images from one host to another without using a repository

To save docker image as file with gzip

docker save <image_name> | gzip > image_file.tgz

to load docker image in remote host

docker load -i image_file.tgz

you may need to rename and re-tag the image as it used in source host

docker image tag <image_id> <image_path_name>:<version>

source: here

Clean and Optimize Docker on your machine

docker system prune

source: here

Docker build pip without warning with lower size image

FROM python:3.9-slim

# suppress pip upgrade warning
ARG PIP_DISABLE_PIP_VERSION_CHECK=1
# disable cache directory, image size 2.1GB to 1.9GB
ARG PIP_NO_CACHE_DIR=1

RUN pip3 install -r requirements.txt

source: here

Troubleshooting Docker node down issue

ID                          NAME          IMAGE                                                      NODE      DESIRED STATE   CURRENT STATE                ERROR                                                     PORTS
03tmvqz4sdfrprtlpelger5t   demo1_web.1   web:version_1.0             Running         Pending about a minute ago   "no suitable node (1 node not available for new tasks)"

To solve this issue, you need to re-initialize docker swarm:

systemctl stop docker
rm -Rf /var/lib/docker/swarm
systemctl start docker
docker swarm init

Remove docker containers

For Unix

To delete all containers including its volumes use,

docker rm -vf $(docker ps -a -q)

To delete all the images,

docker rmi -f $(docker images -a -q)

Remember, you should remove all the containers before removing all the images from which those containers were created.

For Windows

In case you are working on Windows (Powershell),

$images = docker images -a -q
foreach ($image in $images) { docker image rm $image -f }

Based on the comment from CodeSix, one liner for Windows Powershell,

docker images -a -q | % { docker image rm $_ -f }

For Windows using command line,

for /F %i in ('docker images -a -q') do docker rmi -f %i

source: here