{"id":173,"date":"2023-01-02T07:06:24","date_gmt":"2023-01-02T07:06:24","guid":{"rendered":"http:\/\/cloudkul.com\/blog\/?p=173"},"modified":"2024-12-24T11:07:33","modified_gmt":"2024-12-24T11:07:33","slug":"docker-containers-linking","status":"publish","type":"post","link":"https:\/\/cloudkul.com\/blog\/docker-containers-linking\/","title":{"rendered":"Docker Containers Linking"},"content":{"rendered":"

Before reading this blog, do read about the docker containers<\/a>, otherwise, you may not understand how all commands are working in this blog.<\/span><\/p>\n

How to link 2 containers?<\/h2>\n

To link containers, first, you need to install Docker<\/a> and make sure you installed the 1.8.2 version.<\/p>\n

Let’s start now<\/p>\n

First, pull the fresh container by typing:-<\/p>\n

docker pull ubuntu:14.04<\/pre>\n
after pulling it just run the container by typing:-<\/p>\n
docker run -i -t -d ubuntu:14.04<\/pre>\n
now it will provide a terminal for you,<\/p>\n
now you can install apache2 in this container by typing:-<\/p>\n
sudo apt-get update\n\nsudo apt-get install -y apache2<\/pre>\n
after that, just commit your container by some name, I would prefer the “apache_container”<\/strong> name.<\/p>\n
Let execute the command to commit it:-<\/p>\n
docker commit container_id apache_container<\/pre>\n
now stop all the running containers by typing:-<\/p>\n
docker stop $(docker ps -aq)<\/p>\n
remove all running containers by typing:-<\/p>\n
docker rm $(docker ps -aq)<\/pre>\n
now to see your container images, just hit the command:-<\/p>\n
docker images<\/pre>\n
you will get two container names:<\/p>\n
apache_container<\/strong><\/span>
\n ubuntu:14.04<\/strong><\/span><\/p>\n
Your first container is ready, now let’s proceed further with the second container.<\/p>\n
In the second container, we will install the MySQL database & then we will link these two containers with each other.<\/p>\n
ok, let’s hit the command and start your default container ubuntu:14.04 by typing:-<\/p>\n
docker run -i -t ubuntu:14.04<\/pre>\n
now install the database in it by typing:-<\/p>\n
sudo apt-get update\n\nsudo apt-get install mysql-server<\/pre>\n
then restart MySQL service once by typing:-<\/p>\n
service mysql restart<\/pre>\n
After this, check your MySQL user and password by typing:-<\/p>\n
mysql -u root -p\"give_your_password\"\n<\/pre>\n
And grant permission to your database so it would be accessible from the remote side too, by typing:-<\/span><\/p>\n
grant all privileges on *.* to root@\"%\" identified by \"your_password\";<\/pre>\n
here you are granting complete access to your database to everyone.<\/p>\n
First * star stands for all databases, another one stands for all tables and % stands for everyone…<\/p>\n
If you face any problem regarding this, feel free to ask by replying to this post.<\/p>\n
Further, Change the bind_address in my.cnf file with your editor (which is located in \/etc\/mysql\/ path) by typing:-<\/p>\n
nano \/etc\/mysql\/my.cnf<\/pre>\n
now search the line where bind-address=127.0.0.1 & change it to bind-address=0.0.0.0<\/p>\n
save & exit<\/pre>\n
Let’s commit this container by name, I would prefer the “mysql_db” name, ok now let’s commit this container by typing:-<\/p>\n
docker commit container_id mysql_db<\/pre>\n
now stop all the running containers by typing:-<\/p>\n
docker stop $(docker ps -aq)<\/pre>\n
remove all running containers by typing:-<\/p>\n
docker rm $(docker ps -aq)<\/pre>\n
After that, check your container images by typing the command:-<\/p>\n
docker images<\/pre>\n
Now, you will get three container names:<\/p>\n
apache_container<\/strong><\/span>
\n mysql_db<\/strong><\/span>
\n ubuntu:14.04<\/strong><\/span><\/p>\n
Now, the time is to link these two containers……<\/h2>\n
Let’s run these containers to link with each other by typing:-<\/p>\n
docker run --name db -p 3306:3306 -id mysql_db<\/pre>\n
now you will have to restart MySQL service once by typing:-<\/p>\n
docker exec -i -t db bash<\/pre>\n
after the previous command you will get the terminal of your docker container, now just restart MySQL service<\/strong><\/span> and exit from that container.<\/p>\n
Your MySQL container is running in daemonize mode, and we named it “db” for easy linking during connection.<\/p>\n
Let’s link your “db” named container with another container by typing:<\/p>\n
docker run --name web --link db:db -p 80:80 -i -d apache_container\n\nIn daemonize mode your both container are running and linked as well, now access your web (apache_container) by typing:-<\/pre>\n
docker exec -i -t web bash<\/pre>\n
Further, run this command to access MySQL:-<\/p>\n
mysql -h db -u root -p\"your_password\"<\/pre>\n
Now you can access MySQL from another container.<\/p>\n
So, Today we learned how to link two containers and share databases between them.<\/strong><\/span><\/p>\n
In the next blog, we will discuss how to host a website on docker conatiner<\/a>.<\/strong><\/span><\/p>\n
FOR ANY TYPE OF QUERY OR HELP, KINDLY CONTACT US<\/a><\/strong><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
Before reading this blog, do read about the docker containers, otherwise, you may not understand […]<\/a><\/p>\n","protected":false},"author":4,"featured_media":323,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[5],"yoast_head":"\nDocker Containers Linking - Cloudkul<\/title>\n<meta name=\"description\" content=\"Docker Containers are lightweight and can share the kernel and file system of the same operating system if deployed on a single system.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cloudkul.com\/blog\/docker-containers-linking\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Docker Containers Linking - 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