Docker

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install docker on fedora 21

Step 1: Install Docker on Fedora 21

  • As a matter of best practice, we’ll update our packages:
yum update -y
  • Let’s install Docker by installing the docker-io package:
yum -y install docker-io
  • Once the installation completes, we’ll need to start the Docker daemon:
systemctl start docker
  • And finally, and optionally, let’s configure Docker to start when the server boots:
systemctl enable docker
  • Step 2: Download a Docker Container
docker pull marina/fedora21-i386

Step 3: Run a Docker Container basic fedora container with a bash shell, we just run one command. docker run will run a command in a new container, -i attaches stdin and stdout, -t allocates a tty, and we’re using the standard fedora

docker run -i -t marina/fedora21-i386 /bin/bash

connect, or detach, from the shell without exiting use the escape sequence Ctrl-p + Ctrl-q.

sudo docker run -i -t -e DISPLAY=$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix --rm marina/fedora21-i386 /bin/bash

Update image

sed -i 's/\$releasever/21/g;s/\$basearch/i386/g' /etc/yum.repos.d/*
yum clean all
yum -y update
yum -y install firefox
yum -y install https://www.halfface.se/jdk-8u40-linux-i586.rpm
alternatives --install /usr/bin/java java /usr/java/latest/jre/bin/java 200000
alternatives --install /usr/bin/javaws javaws /usr/java/latest/jre/bin/javaws 200000
alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so libjavaplugin.so /usr/java/latest/jre/lib/i386/libnpjp2.so 200000
alternatives --install /usr/lib64/mozilla/plugins/libjavaplugin.so libjavaplugin.so.x86_64 /usr/java/latest/jre/lib/amd64/libnpjp2.so 200000
ln -sf /usr/java/latest/jre/lib/i386/libnpjp2.so /etc/alternatives/libjavaplugin.so
yum -y install 'xorg-x11-fonts*'
*Search for images.
docker search fedora

attach container

List containers.

sudo docker ps
CONTAINER ID        IMAGE                        COMMAND             CREATED             STATUS              PORTS               NAMES
315ea401e287        marina/fedora21-i386:0.1.0   "/bin/bash"         About an hour ago   Up About an hour                        elated_nobel        

list all containers

docker ps -a
docker ps -a --no-trunc

Connect container

Reconnect process. When you do CTRL + c it will die.

sudo docker attach 315ea401e287

list images

sudo docker images

delete image

docker rmi 315ea401e287

delete container

docker container rm cc3f2ff51cab cd20b396a061

Connect to image

docker exec -it elated_nobel /bin/bash

logs

Look at log output from container.

docker logs some-guacamole
docker logs --follow 123141234

stop

Stop docker image.

docker stop 7bcf035e1a4e

start

Start docker image

docker start 7bcf035e1a4e

list ip address of container

docker inspect -f 'Template:Range.NetworkSettings.NetworksTemplate:.IPAddressTemplate:End' c7eec987a17b

If you want to see all settings

docker inspect e2f7a7e275d5

look at mounts

docker inspect -f ‘Template:.Mounts’ 79b9ab19ace0

Guess which container uses which ip.

docker ps 2>&1 | grep -v '^CONTAINER ID' | while read ID THE_REST ; do echo '***' $ID $THE_REST ; docker inspect $ID | grep '"5000"' ; done

install guacamole

Create a mysql database.

mysql ...

Start guacd

docker run --name some-guacd -d guacamole/guacd

Start guacamole

CREDS=guacamole ; docker run --name some-guacamole --link some-guacd:guacd -e MYSQL_DATABASE=${CREDS} -e MYSQL_HOSTNAME=172.17.0.1 -e MYSQL_PORT=3306 -e MYSQL_USER=${CREDS} -e MYSQL_PASSWORD=${CREDS} -d -p 8080:8080 guacamole/guacamole

docker images

List images

docker history image_name

name> will show the layers baked into an image.

docker history $image

docker version

Which version of docker are we running.

docker info

Information about docker

docker cp

Copy file in and out of docker image.

docker cp <containerId>:/file/path/in/container/file /host/local/path/file

create docker image based on centos 7

sudo docker run -i -t --name centos7 centos:7 /bin/bash

create podman image based on centor 7

sudo podman run -i -t --name centos7 centos:7 /bin/bash

Add mount to container

Commit existing image.

sudo podman commit d3c982e9e73e centos7_2021-04-05_12-33

Add mount to new container

sudo podman run -ti --mount type=bind,source=/opt/autopanopro/,target=/opt/autopanopro/ centos7_2021-04-05_12-33 /bin/bash

podman where are files stored

Which image is interesting.

[root@worker-1 ~]# podman ps -a
CONTAINER ID  IMAGE                                          COMMAND        CREATED       STATUS                     PORTS  NAMES
a1c2397ccd1a  registry.redhat.io/rhel8/support-tools:latest  /usr/bin/bash  3 months ago  Exited (0) 2 months ago           toolbox-root
6782eb51bb24  registry.redhat.io/rhel8/support-tools:latest  /usr/bin/bash  3 months ago  Exited (0) 22 minutes ago         toolbox-core
3a11d6bb76c9  registry.redhat.io/rhel8/support-tools:latest  /usr/bin/bash  5 months ago  Exited (0) 5 months ago           toolbox-

Where are files stored.

[root@worker-1 ~]# podman inspect 6782eb51bb24 | grep 02a2f9b0010d4232445bb8bbc42ac4848e3c768e814849c711c19685bd2f46ac
               "UpperDir": "/var/lib/containers/storage/overlay/02a2f9b0010d4232445bb8bbc42ac4848e3c768e814849c711c19685bd2f46ac/diff",
               "WorkDir": "/var/lib/containers/storage/overlay/02a2f9b0010d4232445bb8bbc42ac4848e3c768e814849c711c19685bd2f46ac/work"

docker login halfface.se

Log in to a Docker registry.

docker login halfface.se

autostart

Make all docker images autostart.

docker update --restart unless-stopped $(docker ps -q)