Managing Images

[MUSIC] 0:00 It probably won't be long before you build up big collections of Docker images and 0:04 containers. 0:09 Let's look at some features Docker's provided to help you manage them. 0:09 For this part of the course you'll need this Docker file 0:13 in a supporting script saved in a directory on your computer. 0:16 See the teacher's notes for info on retrieving them. 0:20 Let's build an image based on this Docker file. 0:23 Changing of the directory where the files are stored. 0:26 We'll use the docker build command again. 0:31 And give it a tag of mongo DB, so -t mongodb. 0:34 And we'll say to look for a Docker file in the current directory. 0:41 When we hit Enter, Docker build will carry out all the instructions 0:44 in the Docker file, and will tag the resulting image as mongodb latest. 0:49 We can get a list of the images on your Docker host with the Docker images 1:00 sub-command. 1:05 We'll see the MongoDB image we've just created in the list, 1:07 with a default tag of latest. 1:11 The output will also include other info about each image, 1:14 like when it was created, and its size. 1:19 I also see a temp image that we created earlier in the list. 1:21 We don't need that anymore, so let's get rid of it. 1:25 We can use the docker rmi subcommand, which stands for remove image. 1:27 And we pass it the tag of the image we want to remove, temp. 1:33 At this point we'll get an error if there are any containers still around that 1:38 are based on this image, 1:42 because the containers won't be able to start if we remove the image. 1:43 We'll show you how to remove those containers in the next video so 1:46 that we can remove the image cleanly. 1:50 Be sure to check the teacher's notes for 1:51 links where you can read up on Docker's image management commands. 1:53