Docker Compose Tutorial for Beginners 2026 | Step-by-Step YAML, Commands & Real Demo

[00:00] So, what is Docker Compose?

[00:04] Docker Compose is a tool to manage multiple containers together instead of

[00:09] running many

[00:14] commands one by one.

[00:19] So, you can create one file called Docker Compose.ml with the single

[00:24] command you can

[00:28] start or stop all the containers and you can manage all the

[00:33] containers at a time.

[00:38] So, why it is useful means one key is a time save

[00:43] open the envelope and we can avoid some

[00:48] mistakes also, perfect for creating environments with many services like web applications

[00:52] and

[00:57] database and the caches.

[01:02] So, as I told you, AML stands for at another markup language,

[01:07] it is a simple text format

[01:12] for writing configuration files and the application law apply it want to

[01:16] type of configurations

[01:21] which you are on call.

[01:26] So, when you run the file automatically based on the changes, the

[01:31] containers will get managed.

[01:36] So, data is written as a key value pairs and uses spaces

[01:41] for indentations, node apps, not

[01:45] it is not a scripting language, just a way to describe the

[01:50] data structure.

[01:55] So, example Mhu McOoo.

[02:00] AML file Lopla, Evatengam

[02:05] indentation is nothing but the space, so just I said hereanos just

[02:09] I said this key and the

[02:14] right side is equality, left side is key and right side is

[02:19] value like this.

[02:24] So, how to valid it, so how to valid it, let me

[02:29] create instance quickly here for this purpose.

[02:33] First I am going to say here Docker, iPhone Compose, right, Ubuntu

[02:38] mission name selecting

[02:43] here, keeper, the network settings. So, for the practice and testing purpose,

[02:48] just

[02:53] I am going to add one more security group rule and I

[02:57] am setting it to all traffic and

[03:02] the source type anywhere. So, no need to open all the ports

[03:07] one by one, okay, for every

[03:12] application, that is the reason, right, now click on launch instance. So,

[03:17] once instance

[03:22] launching in the other one or login or other, so just click

[03:26] on view all instances, now

[03:31] let us select your instance, click on connect and copy the command

[03:36] and how to install this

[03:41] Docker. So, you already know, the two I think, so I told

[03:46] you, right. So, to install Docker,

[03:50] we give the curl command, okay, let me open the command prompt

[03:55] now. So, go to the location

[04:00] where keeper is available and just paste the SSH command here, now

[04:05] type s, now you can

[04:10] see we have connected to the Ubuntu mission. So, just the first

[04:14] command I am going to pass

[04:19] your sudo apt, if and get update, to update the packages, previous

[04:24] concept Sunday practice

[04:29] and in videos published on my group law, previous topics and I

[04:34] have a doubt, so I have so these

[04:38] are lalitha karu. Now, let us install the Docker first, so the

[04:43] curl command I am giving here,

[04:48] okay, okay, so how to run this sudo space s, s, s,

[04:53] s, get type and docker dot s,

[04:58] so after installing the Docker, we need to install the Docker compose,

[05:03] so it is the Docker

[05:07] compose and it is a plugin and matter, right. So, warning, what

[05:12] is the warning here, do not

[05:17] use old GitHub, come to the end and day, GitHub link, Docker

[05:22] compose new install, that

[05:27] is the old method. So, always do not give any curl commands,

[05:31] always use official method

[05:36] for the safety and security. So, just pass the command sudo apt

[05:41] update, we have already

[05:46] done this one and after that, you need to give this command

[05:51] to install Docker compose sudo

[05:55] apt install Docker iPhone compose iPhone plugin. Now, the plugin was installed,

[06:00] so how to verify

[06:05] it, just pass the command, do not give iPhone here, Docker compose

[06:10] version. So, it will show

[06:15] you the version of the Docker compose. So, there is a space

[06:19] between Docker and compose

[06:24] in the new command, okay. So, if you see a version number,

[06:29] Docker compose is installed

[06:34] correctly, you should know if you get any permission errors, I already

[06:39] done this slide,

[06:44] so just you need to remember these key points, Docker compose uses

[06:48] AML files. So, this compose

[06:53] plugin will use AML files to define and run multiple multi container

[06:58] Docker applications.

[07:03] AML files are all about indentation and key value. If the everything

[07:08] of our component based

[07:12] on the indentation and the left side you can read as key

[07:17] and right side, there will be

[07:22] a value. So, be careful with these spaces, spaces are nothing but

[07:27] the indentations, right.

[07:32] Validate your AML files before using in real projects, install Docker compose

[07:36] apt not by

[07:41] downloading scripts from the internet. Okay, now let's move to the practical

[07:46] part. So, we

[07:51] can manage our containers together with the help of this Docker compose,

[07:56] it's a AML is

[08:00] a special configuration file with the Docker compose, you can start all

[08:05] containers with

[08:10] just one command. So, as I told you stands were at another

[08:15] markup language, it uses key

[08:20] value based strictly indentation spaces not tabs. AML files are not scripts,

[08:25] they describe

[08:29] data and relationships not actions. What is the tip here, indentations are

[08:34] error indentation

[08:39] errors are the most common issue only spaces never tabs. Creating and

[08:44] understanding a

[08:49] Docker compose file. So, open a open or create the AML file,

[08:53] just you need to open the terminal

[08:58] and use you can text it as you can use like Nimn

[09:03] nano or vi, any text you can use. So,

[09:08] in this case we have used a text editor called bin and

[09:13] this is the, so just I am going to

[09:17] create a file here, file m is Docker f and compose dot

[09:22] AML. So, go to the insert mode and

[09:27] copy this syntax. So, in order to understand this first we have

[09:32] given the version, it will

[09:37] tell you the format version for the compose and services next image

[09:41] among services itself

[09:46] under the services we have DB services means all containers are listed

[09:51] under this key.

[09:56] So, like you can manipulate my DB and itself. So, my DB

[10:01] and my site service container names

[10:06] these are and image after that what will be their image, image

[10:10] name. The image name

[10:15] here we are using is MySQL. So, database it is related to

[10:20] and environment, iPhone E. So,

[10:25] using this iPhone E option we can pass user names, passwords into

[10:30] the application from

[10:34] the container itself. So, we can give and assign some ports to

[10:39] the application. So, here we

[10:44] are assigning 50 port. So, let us say I am going to

[10:49] copy the center code which I have

[10:54] and just I am going to the VM editor or syntax or

[10:58] whatever. So, just to go to escape I am

[11:03] going to put this one. So, just let me use nano instead

[11:08] of this one Docker compose,

[11:13] Docker iPhone compose dot AML. So, go to let us paste this

[11:18] or else let us use VIRLs.

[11:22] We are using the Docker iPhone compose dot AML and again go

[11:27] to insert mode. So, we put

[11:32] search for that. So, I could be coordinate this one and just

[11:37] click on go. So, valid AML

[11:42] it will it will tell you as it is a valid AML.

[11:47] Well, in case I make a valid AML and

[11:51] it is syntax error same layer in two. So, just in the

[11:56] terminal again go to the terminal

[12:01] now press escape colon WQ7 bit. So, now let us run the

[12:06] Docker this AML code. So, what

[12:11] is how to run this? So, just so just in order to

[12:15] start the container just you need to say

[12:20] Docker compose up iPhone D. So, just I am going to pass

[12:25] the command. So, you put current

[12:30] location either on the current location by default, Docker iPhone compose dot

[12:35] AML particularly

[12:39] on the internet, this is called on the matter file name other

[12:44] than the only check just Docker

[12:49] well, in case file name here you may merge the unit to

[12:54] you go for the iPhone F option.

[12:59] So, obviously, it is asking for the permissions which were denied. So,

[13:03] just I am going to

[13:08] say pseudo in front of this. So, you can see that images

[13:13] and pull out right. So, the environment

[13:18] is getting created now. So, let us go with the another example.

[13:23] So, example 2 is lamp

[13:28] stack MySQL, Tomcat, Apache and PHP. So, even even in the whole

[13:32] the create just now put

[13:37] at how commands passes. So, if we want to go to mono

[13:42] of file or pity just we are going

[13:47] to run the Docker compose command right. So, we are creating the

[13:52] one AML file and we are

[13:56] running the Docker compose up command right. So, then give file name

[14:01] let us go with the

[14:06] same file. So, first of all in the mono creates in a

[14:11] file either on the containers we remove

[14:16] channel and the command will be Docker remove old containers the command

[14:20] is Docker rm space

[14:25] iPhone F and you need to pass this command ok. So, it

[14:30] will remove all the old containers

[14:35] ok. So, I am going in the example 2, I am going

[14:40] to remove the old file instructions if it

[14:44] is not on a MySQL along with that one web application we

[14:49] are going to install that is

[14:54] nothing, but the Tomcat and we are going to install on programacle

[14:59] part that is PHP ok.

[15:04] So, this is the syntax SQL API install in Docker compose ok.

[15:09] Now, lamp architecture lamp stack

[15:13] MySQL services under the services you can see we are going to

[15:18] pull the image called MySQL

[15:23] and a SQL upload monomanias now we are setting up the password

[15:28] by giving the environment variables

[15:33] setting up environment variables and we are going to pull up apache

[15:37] web server also and

[15:42] the image name here I am going to use as tommy. So,

[15:47] it means the Tomcat image will get pulled

[15:52] from the Docker hub and I am going to give the port

[15:57] as 6060 for this Tomcat image. So,

[16:01] links I am giving as I am going to link this my

[16:06] DB links I am giving MySQL name we are

[16:11] going to change it to my DB and here we are going

[16:16] to link it to my database right. So,

[16:21] the Tomcat image on a database so link just now and we

[16:25] are pulling the PHP image also this

[16:30] is the entire syntax ok. So, I just I am going to

[16:35] copy this syntax and I am going to paste

[16:40] it here. So, now escape colon wq7 now how to run the

[16:45] command. So, just you need to say

[16:50] Docker compose up space if and the if and e means detached

[16:54] mode mono host machine no

[16:59] no one term but the command will get executed and the containers

[17:04] will run at the background

[17:09] right. So, just let me bring up this. So, you can see

[17:14] now it is pulling PHP apache this is

[17:18] all images it is getting pulled from the Docker hub. So, it

[17:23] is very easy process. So,

[17:28] one or two times I am going to EAML file write over

[17:33] just a easily you can do this one

[17:38] ok. But in case EAML file in case EAML file, EAML code

[17:42] write them I will you know class

[17:47] I am going to make a note and it says just you

[17:52] know the employee EAML code explanation

[17:57] will run to me. So, just I create an EAML code but

[18:02] economic example so how I am going

[18:06] to I image the container sim on even the manage as known

[18:11] as other just on that. So, lamps

[18:16] the EAML architecture we have created lamp and they in the last

[18:21] class also I told you

[18:26] what is the meaning of lamp what is the meaning of lamp

[18:31] ok. Enter web application key

[18:35] kavasana environment anta kudha we can create using lamp architecture. So, lamp

[18:40] full form

[18:45] into lalthikar we have an idea on the meko. L stands for

[18:50] what A stands for what M stands

[18:55] very good Linux Apache very good my SQL and PHP that is

[18:59] what ok. So, yes. So, after this

[19:04] let us remove the old containers and let us go to the

[19:09] other practical part. So, now I

[19:14] am going to stop either me call it access code just go

[19:19] to you can access other people

[19:23] in the entire let us go to you can copy the public

[19:28] IP of your machine and you can give

[19:33] 60 60 port. So, let us go to the AWS now and

[19:38] go back to the instances copy the public IP

[19:43] of it and just I am going to paste it here and

[19:47] call on 60 60 you can check whether your

[19:52] application is working or not. See while in case me re-page go

[19:57] to the code of the ludha

[20:02] runtime Tomcat was successfully installed the application ok in your system. So,

[20:07] let me

[20:12] remove all the containers let me stop and remove all the containers

[20:16] ok all the three

[20:21] containers stopped you can see right. So, now next thing what we

[20:26] are going to do means

[20:31] here lamb stack completed now we can create Jenkins QA prod using

[20:36] Tomcat right. So, we

[20:40] can install. So, what is the version here we are giving the

[20:45] version as three and what type

[20:50] of services dev instance we are creating and we are going to

[20:55] pull the image call Jenkins

[21:00] and we are setting it up to the port called 70 70

[21:04] by default make a Jenkins task a port

[21:09] may come to me 80 80 port long to me. So, we

[21:14] are going to pull one more image called

[21:19] Tommy Tommy is nothing, but the Tomcat Tomcat server. So, ok. So,

[21:24] in a port such as number

[21:28] of 18 8 double 9 ok by default it will also pick

[21:33] 80 80 and after that we are going to

[21:38] link this dev server to Jenkins right and after that prod instance

[21:43] also we are creating

[21:48] and after that we are pulling inside this instance one more image

[21:53] again Tommy and here

[21:57] I am changing this port to 1990 and we are linking it

[22:02] to dev server Jenkins ok.

[22:07] So, let me copy this entire code and its syntax first. So,

[22:12] copy the command and go

[22:17] to the VA editor, go to the AML file and go to

[22:21] inset mode, press escape first, delete

[22:26] the previous AML syntax and just I am going to paste the

[22:31] new syntax here. So, now let

[22:36] me go to inset mode, press escape now colon wq save and

[22:41] click ok. So, just type Ls, you

[22:45] can see our AML file is there here. So, just how to

[22:50] run the file. So, just give the command

[22:55] docker space compose space up I find D. So, you put in

[23:00] your only one of the main Jenkins

[23:05] there. So, how much time it was taken for me. So, almost

[23:09] one hour particularly, so now

[23:14] we are going to do that job for us. So, automatically. So,

[23:19] it can manual effort, there

[23:24] is no manual effort at all right. So, just press enter now.

[23:29] So, it is going to pull the

[23:34] new server. So, simply you can access each and everything. So, just

[23:38] me room a instance

[23:43] of public IP is contour and whatever the port numbers you have

[23:48] given for those applications

[23:53] you can directly access them into your browser. So, just go to

[23:58] the console, just copy the public

[24:02] IP of the instance now. So, I will work out now a

[24:07] lecture now. So, I am on Jenkins port

[24:12] number even the school number, 70, 70 and each other. So, just

[24:17] open the chrome browser

[24:22] just paste the public IP and I am giving colon 70, 70.

[24:26] Now, press enter see the Jenkins

[24:31] is going to ask you for the password now. So, Jenkins work

[24:36] out from there. Next time

[24:41] the chammono or Tomcat in KI. So, now, let us copy the

[24:46] public IP of our instance. So,

[24:50] you can see check all the containers are running or not. Just

[24:55] give the comment here

[25:00] Docker container. Alas, it will list out all the containers. See two

[25:05] Tomcat server, Tomcat

[25:10] of our publications are running right and one Jenkins was installed in

[25:15] the dev instance

[25:19] right. So, now, let us try to access it and I am

[25:24] going to chammono. We have assigned it

[25:29] 80 at 90, 70, 70, 80 default together, 70, 70 chammono. Now,

[25:34] call on 70, 70. Okay, Jenkins

[25:39] has a successful run out may no problem at all and what

[25:43] about the Tomcat, double 8,

[25:48] double 9 and 90. Okay. Now, let us go to console and

[25:53] go to check the proper go panjas

[25:58] let us pass double 9, double 9 Tomcat application should get.

[26:03] Oh, he taught me. Okay. 80, 80 portal on the bar. The

[26:07] 88 double n again.

[26:12] Go to insert mode and what is the example for here, the

[26:17] syntax.

[26:22] Copy this syntax, go back to terminal, just paste it. Now, press

[26:27] escape, WQ save and

[26:31] click it. Now, let us run this containers. So, how to run

[26:36] the container? Just you need

[26:41] to say Docker compose space up, I find D. Now, it is

[26:46] pulling all those images and we can

[26:51] access it giving the, what, double 4, double 4, 5 9 0

[26:56] 1 for V and C and 5 9 0 2, Firefox

[27:00] image was pulled from container started. So, just use the command Docker

[27:05] containers

[27:10] LS to see all the containers they are working fine or not.

[27:15] So, now, let us copy the public

[27:20] IP and test all our applications are working properly or not. So,

[27:24] what is the first port?

[27:29] Double 4, double 4. So, just give here double 4, double 4,

[27:34] the center. You can see Selenium

[27:39] grid interface successfully and next, what is the next port? On spatical

[27:44] port, type in

[27:48] the router, just remove all the containers. To remove all the containers,

[27:53] just pass this

[27:58] command. So, network, I will check, check, check, check, check, check, check.

[28:03] So tomorrow

[28:08] class I will tell you, I will go time to troubleshoot it.

[28:12] So, all the containers stopped

[28:17] and you can stop your instance also. So, there are doubts on

[28:22] the aragandic glass law,

[28:27] later on, I will add this session. No, it's not flat, it's

[28:32] just him. Please do practice.