Docker container stop once the main program it started with stop running. If you start a docker container with console using -ti option, it stop when you disconnect.
To avoid process getting stopped, you can detach from the console.
This is done by pressing keys
CTRL + P
Followed by
CTRL + Q
You can just press CTRL key, then press “p”, then “q”.
docker images command list all docker images (blueprints) available on your server.
root@ok:~# docker images REPOSITORY TAG IMAGE ID CREATED SIZE gcr.io/tensorflow/tensorflow latest 04f0b1131389 9 months ago 1.13GB tensorflow/tensorflow 1.1.0 04f0b1131389 9 months ago 1.13GB root@ok:~#
To run a project
docker-compose up -d
Rebuild project and run
docker-compose up --build
To stop all containers in the project
docker-compose down
To see list of containers started by docker-compose, run
docker-compose ps
To get container id for a container started by docer-compose, run
docker-compose ps -q NAME_OF_SERVICE
Example
root@ee:/opt/easyengine/services# docker-compose ps
Name Command State Ports
-----------------------------------------------------------------------------------------------------------------
services_global-db_1 docker-entrypoint.sh mysqld Up 3306/tcp
services_global-nginx-proxy_1 /app/docker-entrypoint.sh ... Up 0.0.0.0:443->443/tcp, 0.0.0.0:80->80/tcp
services_global-redis_1 docker-entrypoint.sh redis ... Up 6379/tcp
root@ee:/opt/easyengine/services# docker-compose ps -q global-nginx-proxy
140191cb36add7be4f993bbff4a0f8a054d0985486831fcc669a80a577988a92
root@ee:/opt/easyengine/services#
docker-compose: error while loading shared libraries
Docker compose start container on boot
Before you can delete a docker image, you need to delete any container that is based on this image. So see how to delete all docker containers, see
To list all available docker images, run
docker images
To just display image ID only, run with -q option
docker images -q
Now lets pass the result to docker rmi command using xargs
docker images -q | xargs docker rmi
This will delete all images. You can also use
docker rmi $(docker images -q)
See docker
We need to use diff commands to to do this. First lets get list of all containers.
docker ps -a -q
This will list all docker containers available. Before we can delete, we need to stop them.
To stop all running containers, use
docker stop $(docker ps -q)
To delete all containers, run
docker rm $(docker ps -a -q)
To backup the docker image, run
docker save -o ~/IMAGE_NAME.tar IMAGE_NAMETo restore a container, run
docker load -i ~/IMAGE_NAME.tarBackup and Restore a Docker Container
To backup, run
docker export -o CONTAINER_NAME.tar CONTAINER_NAMETo restore, run
docker import CONTAINER_NAME.tar serverok/CONTAINER_NAME:2.0docker exec command allow running commands inside running containers.
docker exec -ti CONTAINER_ID /bin/bash
See docker
Docker run command create container from IMAGE and run it.
docker run [OPTIONS] IMAGE[:TAG|@DIGEST] [COMMAND] [ARG...]
Here we run nginx docker image.
docker run -d -p 80:80 --name webserver nginx
-d = detach after starting container.
-p 80:80 = port 80 on host machine is mapped to port 80 inside container.
Now you will be able to access Nginx server by visiting IP of host machine.
To stop running container, run
root@ok-vm:~# docker stop webserver webserver root@ok-vm:~#
To start
docker start webserver
Docker Volumes
Docker volume can be specified with -v, it allow you to share a folder in host machine with docker container.
docker run -d -p 80:80 -v /var/www/html:/usr/share/nginx/html --name webserver nginx
Here folder /var/www/html on host machine will be mounted as /usr/share/nginx/html in the container. This allows you to make the data persistent.
See Docker
On a Cpanel Server with an old version of PHP, one of the applications requires MySQL 5.6 to work. Since the PHP version is no longer supported, updating MySQL using WHM will upgrade PHP to one of the supported versions, which may break existing sites. So I decided to install MySQL inside docker.
First, create a folder for MySQL docker to store data.
mkdir /home/mysql-docker-dataNow run
docker run --name serverok-mysql --restart=unless-stopped -v /home/mysql-docker-data:/var/lib/mysql -p 3307:3306 -e MYSQL_ROOT_PASSWORD=KqAtPd3BpyKjQ -d mysql:5.6For MairaDB 10.1, run
docker run --name serverok-mysql --restart=unless-stopped -v /home/mysql-docker-data:/var/lib/mysql -p 3307:3306 -e MYSQL_ROOT_PASSWORD=KqAtPd3BpyKjQ -d mariadb:10.5Here I used “KqAtPd3BpyKjQ” as the password, replace it with your password.
-p 3307:3306 -> tell docker to map port 3306 inside the docker container to port 3307 on host machine.
This will pull the MySQL docker image and start it.
Once it finished downloading, you can check if it is running with the command
root@rapidswitch [~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
24c86d5ce381 mysql:5.6 "docker-entrypoint..." 8 minutes ago Up 8 minutes 0.0.0.0:3307->3306/tcp serverok-mysql
root@rapidswitch [~]# To connect to MySQL use
mysql -h 127.0.0.1 --port 3307 -u root -pKqAtPd3BpyKjQTo start the container on boot, you can run
docker update --restart=unless-stopped serverok-mysqlOr use /etc/rc.local, this may not work with newer versions of Ubuntu/Debian
docker start serverok-mysqlIf you need to try docker on web without installing on your computer, use https://labs.play-with-docker.com
To install docker, run
wget -qO- https://get.docker.com/ | shInstall docker compose
curl -L "https://github.com/docker/compose/releases/download/1.23.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
chmod 755 /usr/local/bin/docker-composeCheck docker is working
root@forum:~# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
ca4f61b1923c: Pull complete
Digest: sha256:66ef312bbac49c39a89aa9bcc3cb4f3c9e7de3788c944158df3ee0176d32b751
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://cloud.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/
root@forum:~# To list all running docker containers
root@rapidswitch [~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
root@rapidswitch [~]#