add cloud info

CloudComputing_Lab/modules/ROOT/nav.adoc

@@ -7,4 +7,5 @@
 * xref:f.adoc[Docker Swarm]
 * xref:docker-build.adoc[DigitalSkills-docker_build]
 * xref:docker-compose.adoc[DigitalSkills-deploy_service]
+* xref:admin.adoc[DigitalSkills-ServiceAdmin]
 * xref:tech-list.adoc[Getting_started]

CloudComputing_Lab/modules/ROOT/pages/admin.adoc

@@ -0,0 +1,213 @@
+= Services Admin
+
+== Displaying Docker Images
+
+To see the list of Docker images on the system, you can issue the following command.
+
+.docker images
+[source,sh]
+----
+docker images
+----
+
+This command is used to display all the images currently installed on the system.
+
+
+**Output:**
+
+-    TAG − This is used to logically tag images.
+-    Image ID − This is used to uniquely identify the image.
+-    Created − The number of days since the image was created.
+-    Virtual Size − The size of the image.
+
+== Removing Docker Images
+
+The Docker images on the system can be removed via the docker rmi command. 
+
+.docker images
+[source,sh]
+----
+docker rmi
+
+This command is used to remove Docker images.
+Syntax
+
+docker rmi ImageID
+----
+
+
+== Containers
+
+Containers are instances of Docker images that can be run using the Docker run command. The basic purpose of Docker is to run containers. 
+
+
+=== Running a Container
+
+Running of containers is managed with the Docker run command. To run a container in an interactive mode, first launch the Docker container.
+
+.run docker image
+[source,sh]
+----
+docker run –it myimage /bin/bash 
+----
+
+
+=== Listing of Containers
+
+One can list all of the containers on the machine via the docker ps command. This command is used to return the currently running containers.
+
+.run docker image
+[source,sh]
+----
+docker ps
+----
+
+=== Display the running processes of a container
+
+
+With this command, you can see the top processes within a container.
+Syntax
+
+.docker top
+[source,sh]
+----
+docker top ContainerID 
+
+Options
+
+    ContainerID − This is the Container ID for which you want to see the top processes.
+----
+
+=== Stop a running container
+
+This command is used to stop a running container.
+
+.docker stop
+[source,sh]
+----
+docker stop ContainerID 
+
+Options
+
+    ContainerID − This is the Container ID which needs to be stopped.
+----
+
+=== Attach a running container
+
+
+This command is used to attach to a running container.
+
+.docker 
+[source,sh]
+----
+docker attach ContainerID 
+
+Options
+
+    ContainerID − This is the Container ID to which you need to attach.
+----
+
+
+=== Delete container
+
+This command is used to delete a container.
+
+.docker rm
+[source,sh]
+----
+docker rm ContainerID 
+
+Options
+
+    ContainerID − This is the Container ID which needs to be removed.
+----
+
+=== Container Logging
+
+Logging is also available at the container level.
+
+.docker log
+[source,sh]
+----
+Docker logs containerID 
+
+Parameters
+
+    containerID − This is the ID of the container for which you need to see the logs.
+----
+
+== Volumes
+
+Volumes are the preferred mechanism for persisting data generated by and used by Docker containers.
+
+.docker volumes
+[source,sh]
+----
+docker run -d --name mycontainer -v /var/www/html:/var/html nginx:latest
+----
+
+
+== repositories
+
+You might have the need to have your own private repositories. You may not want to host the repositories on Docker Hub. For this, there is a repository container itself from Docker. Let’s see how we can download and use the container for registry.
+
+
+=== Create 
+
+.docker registry
+[source,sh]
+----
+docker run –d –p 5000:5000 –-name registry registry:2
+
+The following points need to be noted about the above command:
+
+    Registry is the container managed by Docker which can be used to host private repositories.
+
+    The port number exposed by the container is 5000. Hence with the –p command, we are mapping the same port number to the 5000 port number on our localhost.
+
+    We are just tagging the registry container as “2”, to differentiate it on the Docker host.
+
+    The –d option is used to run the container in detached mode. This is so that the container can run in the background
+----
+
+
+== Docker Hub 
+
+Docker Hub is a registry service on the cloud that allows you to download Docker images that are built by other communities. You can also upload your own Docker built images to Docker hub.
+
+To run apache, you need to run the following command:
+
+.run docker image from Docker Hub
+[source,sh]
+----
+docker run -p 8080:80 apache
+
+Note the following points about the above  command −
+
+
+    Here, apache is the name of the image we want to download from Docker hub and install on our Ubuntu machine.
+
+    -p is used to map the port number of the internal Docker image to our main Ubuntu server so that we can access the container accordingly.
+----
+
+
+=== Push
+
+use the Docker push command to push the image to our private repository.
+
+.docker registry
+[source,sh]
+----
+docker push localhost:5000/myimage
+----
+
+=== Pull
+
+use the following Docker pull command to pull image from our private repository.
+
+.docker registry
+[source,sh]
+----
+docker pull localhost:5000/myimage
+----
+