For this workshop we need DockerCE installed on your laptop/server
docker --help
Lets pull an image of nginx:
docker pull alpine
Let's verify this image is pulled:
docker images
Now - let's run it:
docker run -it alpine
Let's run some more interesting image:
docker run -d -p 80:80 --name=nginx nginx:alpine
Notice we ran it with -d so the docker is in detach mode and not attached to our current screen. In order to check the status of the docker container we can execute:
docker ps
Also we user -p option in order to map port 80 from the container to our host.
now we can browse into the server: http://localhost
We can see the logs of the container:
docker logs <Container ID>
We can use -f flag to follow the log.
If we would like to stop the container we will use the command:
docker stop <Container ID>
or
docker kill <Container ID>
After the container is stopped - we will not see it on
docker ps
in order to see all of the containers (started and stopped) we can use the -a flag
docker ps -a
to start stopped container we will use:
docker start <Container ID>
to remove stopped docker container - we will use:
docker rm <Container ID>
to remove running container we will use the -f flag:
docker rm -f <Container ID>
And let's start the nginx container again:
docker run -d -p 80:80 --name=nginx nginx:alpine
In order to execute command running container we will use:
docker exec -it <Container ID> <command>
for example:
docker exec -it nginx ls -l /
We can use it to connect into container by running a shell:
docker exec -it nginx sh
Other flags of docker run are:
-v for mounting folder from the host to the container
-e for setting environtment variable
Example command:
docker run -it -e TEST=myname -v ~/docker-workshop/src:/mnt alpine
now we can run env and see the environment variable and see the content of mnt by ls /mnt
In order to do some checks we may would like to copy files from/to our container. We will use the command docker cp for example:
docker cp src/index.html nginx:/usr/share/nginx/html
We changed the default index file on our nginx container and now when we will check http://localhost we will see the new page
For this exrecise we will need docker-hub account.
First docker image we will create will be a demo PHP site. We copied a site from https://startbootstrap.com/themes/freelancer/ to the folder php-site. and created a simple Dockerfile.
In order to build the image we will run the command:
docker build -t php-site:version1 .
Our docker image is ready. to test it we can execute:
docker run -d -p 80:80 php-site:version1
And check that the site is working as expected on http://localhost
In order to tag our image - we can use the command docker tag for example:
docker tag php-site:version1 <your-dockerhub-account>/php-site:latest
we can save our new image in dockerhub - for that we need to login:
docker login
after login we can push the image:
docker push <your-dockerhub-account>/php-site:latest
We can continue playing and build/push more images.