WEBVTT 00:00.930 --> 00:01.763 -: In the last section, 00:01.763 --> 00:04.920 we started up a new copy of the Reddis container image. 00:04.920 --> 00:08.190 Inside there we have a running copy of the Reddis server 00:08.190 --> 00:10.170 and we now need to figure out how we can somehow 00:10.170 --> 00:14.730 start up the Reddis CLI also inside of that container. 00:14.730 --> 00:16.230 To do so we're going to be making use 00:16.230 --> 00:18.270 of another Docker command. 00:18.270 --> 00:21.690 So the Docker command we're going to use is Docker exec. 00:21.690 --> 00:23.580 Exec is short for execute, 00:23.580 --> 00:26.550 and we use it to execute an additional command 00:26.550 --> 00:28.290 inside of a container. 00:28.290 --> 00:29.123 We're going to write, 00:29.123 --> 00:33.093 Docker exec, we'll then put down it, dash it. 00:33.990 --> 00:35.790 This little argument right here allows us 00:35.790 --> 00:39.270 to type input directly into the container. 00:39.270 --> 00:41.250 We then provide the container ID and then 00:41.250 --> 00:44.850 the command that we want to execute inside of the container. 00:44.850 --> 00:47.750 So let's try doing this right now and seeing what happens. 00:49.080 --> 00:51.060 I'm gonna first go back over to my turn, 00:51.060 --> 00:54.000 I'm gonna verify that my Reddis container is still running. 00:54.000 --> 00:56.190 I can either look at it inside the running window, 00:56.190 --> 00:58.860 alternatively, I could run Docker PS and see, 00:58.860 --> 01:01.653 yep I still have that Reddis image still going. 01:03.180 --> 01:06.720 So then to start up a second program inside the container 01:06.720 --> 01:08.490 I'll run Docker exec. 01:08.490 --> 01:09.690 Oops, forgot one thing here, 01:09.690 --> 01:11.280 we gotta get the container's id. 01:11.280 --> 01:14.610 We'll do Docker ps and there's the ID right there. 01:14.610 --> 01:19.610 So I'll do Docker exec, dash it, I'll paste in the id 01:20.490 --> 01:22.320 and then the command that I want to execute 01:22.320 --> 01:25.983 inside there is Reddis dash CLI. 01:27.060 --> 01:29.130 And when I do so, you'll see that I now get that 01:29.130 --> 01:31.470 a little bit more familiar looking Command Frontier 01:31.470 --> 01:36.150 and I can write out something like set my value five 01:36.150 --> 01:39.540 and get my value, and it retrieves five. 01:39.540 --> 01:42.150 So by using the exec command, we were able to 01:42.150 --> 01:46.050 start up a second running program inside of our container. 01:46.050 --> 01:49.530 And the dash IT flag right here allowed us to enter 01:49.530 --> 01:51.150 in text on our keyboard 01:51.150 --> 01:54.120 and have it be sent into that running container. 01:54.120 --> 01:55.380 As a very quick exercise 01:55.380 --> 01:57.240 let's try removing the IT flag there 01:57.240 --> 01:58.713 and seeing what happens. 01:59.610 --> 02:03.120 I'm gonna exit this by hitting control C on my keyboard 02:03.120 --> 02:05.460 and then I'll do Docker exec again. 02:05.460 --> 02:09.210 But this time I'm going to leave off the IT flags. 02:09.210 --> 02:13.233 So I'll do Docker exec, the id, and then Reddis CLI. 02:14.160 --> 02:15.420 And you'll notice that this time around 02:15.420 --> 02:18.510 I just got kicked directly back to my terminal. 02:18.510 --> 02:22.320 I got kicked directly back because Reddis CLI was started up 02:22.320 --> 02:26.100 but we did not get the ability to enter in any text. 02:26.100 --> 02:27.660 So when Reddis CLI was started up 02:27.660 --> 02:28.687 but it very quickly realized, 02:28.687 --> 02:30.480 "Hey I don't have any possibility 02:30.480 --> 02:32.010 of getting any text input." 02:32.010 --> 02:34.770 It decided to just entirely close down 02:34.770 --> 02:36.420 and kick us back to our terminal. 02:37.500 --> 02:40.980 Now this idea behind kind of adding on this IT flag 02:40.980 --> 02:42.780 and adding in text here is actually something 02:42.780 --> 02:45.180 that's rather important in the world of Docker. 02:45.180 --> 02:46.590 So let's take a quick pause right here 02:46.590 --> 02:48.270 and we're going to come back in the next section 02:48.270 --> 02:51.330 and kind of expand upon what IT right here means. 02:51.330 --> 02:52.980 So I'll see you in just a minute.