Skip to main content

Learn to build docker image

Hi guys,

I will try to show you here how u can learn to build a image using docker and run that image later as a container.

I will build a image to run a webserver with static content in it and for this I will use nginx image which is available in docker hub .


Hoping that you have already installed docker package in your machine.


Below are the steps to build a simple docker image:

1. Create a Docker file and add below contents

Dockerfile

"From nginx" indicates that docker should use nginx image. If nginx image is available in local repository then it will use that else it will download from docker hub

"COPY index.html /usr/share/nginx/html" says that copy the index.html which is available in current directory to directory /usr/share/nginx/html

2. Create index.html  which is required as per above steps in same directory



3. Build the image



mynginx is the image name given and v1 is the tag for that image

Please note that at the end of command there is a dot '.' which indicates that docker should pick files from current directory

4. List the images

Once the image build is successful verify that image is listed 









 5. Create a container

We will now create a container with image which we have just built



5. Verify if container created

We will verify if myweb container is created successfully



6. Access the webserver




Labels:

Comments

Post a Comment

Popular posts from this blog

Ansible script to stop iptables

 Ansible script to stop iptables and disable during boot Step 1. [root@cluster playbooks]# pwd /root/playbooks [root@cluster playbooks]# cat hosts [webservers] 169.254.41.221 169.254.41.222 Step2. [root@cluster playbooks]# cat iptables.yml --- - name: stop ipatbles and disable   hosts: webservers   tasks:   - name: stop iptables     service: name=iptables state=stopped   - name: disbale on iptable on boot     service: name=iptables enabled=no Step3: [root@cluster playbooks]# ansible-playbook iptables.yml PLAY [stop ipatbles and disable] *********************************************** TASK [setup] ******************************************************************* ok: [169.254.41.222] ok: [169.254.41.221] ok: [localhost] TASK [stop iptables] *********************************************************** changed: [localhost] ok: [169.254.41.221] ok: [169.254.41.222] TASK [disbale on iptable on boot] *********************************...
Post a Comment
Read more

Get information about remote hosts using Ansible

Get information about remote hosts using Ansible setup command Below command gives all the information of client hosts which includes memory, server architecture, IP adresses etc. [root@ansible mywork]# ansible all -i hosts -m setup If you need just memory information of remote node then for the above command need to add filter as shown below [root@ansible mywork]# ansible all -i hosts -m setup -a "filter=ansible_*_mb" node01 | SUCCESS => {     "ansible_facts": {         "ansible_memfree_mb": 873,         "ansible_memory_mb": {             "nocache": {                 "free": 919,                 "used": 77             },             "real": {                 "free": 873,           ...
Post a Comment
Read more

Using ansible ping module check connectivity between two nodes

Using ansible ping module check connectivity between two nodes Once server and client machine is configured with SSH passwordless authentication and  ansible installed in server, we will verify if ansible can connect from server to client. If you have not configured refer page Login to server node and create a directory to save all the work done in one location Eg:mywork [root@ansible ~]# mkdir mywork [root@ansible ~]# cd mywork/ Create new file called "hosts" under "mywork" and add your client host name in the file as shown below. [root@ansible mywork]# cat hosts [mynodes] node01 Now is the time to check if ansible from server machine able to communicate to client node01 To check this we will use ansible module called ping. Run command as shown below. [root@ansible mywork]# ansible all -i hosts -u root -m ping node01 | SUCCESS => {     "changed": false,     "ping": "pong" }
Post a Comment
Read more