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--- docker:images:update_and_commit_an_image [2020/11/11 10:07] – created 192.168.1.1
+++ docker:images:update_and_commit_an_image [2020/11/11 10:25] (current) – 192.168.1.1
@@ Line 1: / Line 1: @@
 ====== Docker - Images - Update and Commit an Image ======
-Pull an image.
+===== Pull an image =====
+For example, to pull the Ubuntu 20.04 Docker image from the Docker Hub.
 <code bash>
@@ Line 7: / Line 9: @@
 </code>
+----
+===== Create a new container =====
 Create a new container from the Ubuntu 20.04 image.
@@ Line 14: / Line 19: @@
 </code>
-This will create a new container and  attach to the bash shell as shown below:
+This will create a new container and attach to the bash shell as shown below:
 <code bash>
@@ Line 20: / Line 25: @@
 </code>
-Now, install the Nginx package inside the container with the following command:
+----
+===== Install NginX into the Container =====
+Install the Nginx package inside the container:
 <code bash>
@@ Line 27: / Line 36: @@
 </code>
-Next, exit from the container with the following command:
+----
+===== Exit from the Container =====
 <code bash>
@@ Line 33: / Line 46: @@
 </code>
-Next, locate your new container ID using the following command:
+----
+===== Obtain the Container ID =====
+Locate your new container ID:
 <code bash>
@@ Line 39: / Line 56: @@
 </code>
-You should get the container ID in the following output:
+returns:
 <code bash>
@@ Line 46: / Line 63: @@
 </code>
-Next, save the updated container with a new image named nginx-instance using the following command:
+----
+===== Save the Updated Container =====
+Save the updated container with a new image named nginx-instance:
 <code bash>
@@ Line 54: / Line 75: @@
   * Where:   013aecdd6919 is the ID of the container.
-You can now verify your newly created image “nginx-instance” with the following command:
+----
+===== Verify the newly created Image =====
+Verify the newly created image “nginx-instance”:
 <code bash>
@@ Line 60: / Line 86: @@
 </code>
-You should get the following output:
+returns:
 <code bash>
@@ Line 67: / Line 93: @@
 ubuntu              20.04               d70eaf7277ea        12 days ago         72.9MB
 </code>
+----
+===== Log in to the Docker Hub =====
+<WRAP info>
+**NOTE:** In order to work with the Docker Hub, you will need to create an account on [[https://hub.docker.com/account/signup|Docker Hub]].
+</WRAP>
+<code bash>
+docker login
+</code>
+returns:
+<code bash>
+Username: peter
+Password:
+WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
+Configure a credential helper to remove this warning. See
+https://docs.docker.com/engine/reference/commandline/login/#credentials-store
+Login Succeeded
+</code>
+----
+===== Tag the Image to push to the Docker Hub =====
+For example, to tag the nginx-instance image:
+<code bash>
+docker tag 12cefc9b5362 peter/nginx-instance:ubuntu
+</code>
+where:
+  * 12cefc9b5362 is the ID of the nginx-instance image.
+  * peter is your Docker Hub username.
+  * nginx-instance is the name of the image that you want to push.
+----
+===== Verify the Tagged Image =====
+<code bash>
+docker images
+</code>
+returns:
+<code bash>
+REPOSITORY                 TAG                 IMAGE ID            CREATED             SIZE
+peter/nginx-instance       ubuntu              12cefc9b5362        12 minutes ago      158MB
+nginx-instance             latest              12cefc9b5362        12 minutes ago      158MB
+ubuntu                     20.04               d70eaf7277ea        12 days ago         72.9MB
+</code>
+----
+===== Push the new Image to the Docker Hub =====
+Push the new image named peter/nginx-instance to the Docker Hub:
+<code bash>
+docker push peter/nginx-instance
+</code>
+----
+===== Login to the Docker Hub =====
+Login to the Docker Hub using your web browser and verify that the nginx-instance image appears in the Repositories.