Wt is Docker compose - amresh087/newronaRepos GitHub Wiki
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The docker compose is tool for defining and for running multi container docker application.
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In docker compose used yml file to configure application service (docker-compose.yml)
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In docker compose you can start all services with a single command (docker-compose up)
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In docker compose you can stop all service with single command (docker-compose down)
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you can scale up selected services when required
Step 1--> Install docker-compose in Linux or EC2 machine
docker compose official git Repo
command for install docker-compose
sudo curl -L https://github.com/docker/compose/releases/download/1.21.0/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
docker-compose -v
docker-compose version
Step 2 --> create docker compose file at any location on our system and file name docker-compose.yml
on terminal / putty
pwd
cd ..
sudo mkdir dockercomposefile
cd dockercomposefile
sudo touch docker-compose.yml
ls
sudo vi docker-compose.yml
press i (for insert)
version: '3'
services:
web:
image: nginx
ports:
- "9090:80"
database:
image: redis
Now need save file so press esc button
:wq! then enter
Note --> here in ports section 80 is web server and my host-server 9090
Now you can check data in the file by using command sudo cat filename
sudo cat docker-compose.yml
Step 3 --> check validity of the file by command docker-compose config if not throw errors show file content then yml file is good. Otherwise problem in yml file
Step 4 --> Run docker compose file
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docker-compose up
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docker-compose down
Scale services
docker-compose up -d --scale database = 4
in above command database is defined docker-compose as service so redis run 4 container