freeCodeCamp/guide/english/containers/docker/creating-a-web-server-inside-docker/index.md

title
Creating a Web Server inside Docker

Creating a Web Server inside Docker

Start docker and it’s container -

```
$ systemctl restart docker
$ systemctl enable docker
$ docker run -it --name webserver centos:latest
```

Install httpd

• yum is already configured in centos docker image. So directly install httpd software - $ yum install httpd -y

• Create a dummy web page to check the server -

  $ cd /var/www/html
  $ vi index.html
  

Start services -

• If we use systemctl to start the services, this will not work and gives an error.

• systemctl doesn't work in docker.

• In actual RedHat system, when we start a service it actually runs a script in background. That script starts daemons.

• To find the path of that script, check status of service $ systemctl status httpd Loaded option shows script file path.

• In that file, we have a line which actually starts service - ExecStart = /usr/sbin/httpd....... So the command /usr/sbin/httpd actually starts httpd server.

• Service is running or not, can be checked by - $ ps -aux | grep httpd

• So we don't require systemctl we can directly start our web server using- $ /usr/sbin/httpd This will start the web server.

• ifconfig doesn't work in docker.

  • So install software, which gives ifconfig command.
  • It can be checked in actual Redhat system by running this command- $ rpm -qf /usr/sbin/ifconfig
  • This comes from net-tools package.
  • So Install net-tools in docker os.

• Making image of created web server - $ docker commit webserver apacheimg:v1

  • Name of container is webserver.
  • This image can be share with exact setup with other users.

• To save created image - $ docker save apacheimg:v1 -o mywebserver.tar

• To start httpd service automatically when container starts -

  • Write /usr/sbin/httpd in following file. $ vim /root/.bashrc

• To copy a file in container from the base system - $ docker cp /root/form.txt myconatiner:/

Summary

Summary of all the commands -

$ docker run -it --name webserver centos:latest
$ yum install httpd -y
$ rpm -q httpd
$ cd /var/www/html
$ vi index.html
// write some web content

$ /usr/sbin/httpd
$ yum install net-tool

$ ifconfig