74 lines
2.2 KiB
Markdown
74 lines
2.2 KiB
Markdown
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# Running Web Server inside Docker
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### Start docker and it’s container -
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```
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$ systemctl restart docker
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$ systemctl enable docker
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$ docker run -it --name webserver centos:latest
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```
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### Install httpd
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- **yum** is already configured in centos docker image.
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So directly install **httpd** software -
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`$ yum install httpd -y`
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- Create a dummy web page to check the server -
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```
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$ cd /var/www/html
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$ vi index.html
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```
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### Start services -
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- If we use **systemctl** to start the services, this will not work and gives an error.
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- **systemctl** doesn't work in docker.
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- In actual RedHat system, when we start a service it actually runs a script in background. That script start daemons.
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- To find the path of that script, check status of service
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`$ systemctl status httpd`
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`Loaded` option shows script file path.
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- In that file, we have a line which actually starts service -
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`ExecStart = /usr/sbin/httpd....... `
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So the command `/usr/sbin/httpd` actually starts **httpd** server.
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- Service is running or not, can be checked by -
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`$ ps -aux | grep httpd`
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- So we don't require `systemctl` we can directly start our web server using-
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`$ /usr/sbin/httpd`
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This will start the web server.
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- `ifconfig` doesn't work in docker.
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- So install software, which gives `ifconfig` command.
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- It can be checked in actual Redhat system by running this command-
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`$ rpm -qf /usr/sbin/ifconfig`
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- This comes from **net-tools** package.
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- So Install **net-tools** in docker os.
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- Making _image_ of created web server -
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`$ docker commit webserver apacheimg:v1`
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- Name of container is _webserver_.
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- This image can be share with exact setup with other users.
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- To save created image -
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`$ docker save apacheimg:v1 -o mywebserver.tar`
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- To start **httpd** service automatically when container starts -
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- Write `/usr/sbin/httpd` in following file.
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`$ vim /root/.bashrc`
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- To copy a file in container from the base system -
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`$ docker cp /root/form.txt myconatiner:/`
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## Summary
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Summary of all the commands -
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```
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$ docker run -it --name webserver centos:latest
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$ yum install httpd -y
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$ rpm -q httpd
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$ cd /var/www/html
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$ vi index.html
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// write some web content
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$ /usr/sbin/httpd
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$ yum install net-tool
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$ ifconfig
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```
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