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155 lines
6.2 KiB
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155 lines
6.2 KiB
Markdown
[#]: collector: (lujun9972)
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[#]: translator: (geekpi)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Building container images with the ansible-bender tool)
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[#]: via: (https://opensource.com/article/19/10/building-container-images-ansible)
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[#]: author: (Tomas Tomecek https://opensource.com/users/tomastomecek)
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Building container images with the ansible-bender tool
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======
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Learn how to use Ansible to execute commands in a container.
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![Blocks for building][1]
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Containers and [Ansible][2] blend together so nicely—from management and orchestration to provisioning and building. In this article, we'll focus on the building part.
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If you are familiar with Ansible, you know that you can write a series of tasks, and the **ansible-playbook** command will execute them for you. Did you know that you can also execute such commands in a container environment and get the same result as if you'd written a Dockerfile and run **podman build**.
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Here is an example:
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```
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\- name: Serve our file using httpd
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hosts: all
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tasks:
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- name: Install httpd
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package:
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name: httpd
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state: installed
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- name: Copy our file to httpd’s webroot
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copy:
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src: our-file.txt
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dest: /var/www/html/
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```
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You could execute this playbook locally on your web server or in a container, and it would work—as long as you remember to create the **our-file.txt** file first.
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But something is missing. You need to start (and configure) httpd in order for your file to be served. This is a difference between container builds and infrastructure provisioning: When building an image, you just prepare the content; running the container is a different task. On the other hand, you can attach metadata to the container image that tells the command to run by default.
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Here's where a tool would help. How about trying **ansible-bender**?
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```
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`$ ansible-bender build the-playbook.yaml fedora:30 our-httpd`
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```
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This script uses the ansible-bender tool to execute the playbook against a Fedora 30 container image and names the resulting container image **our-httpd**.
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But when you run that container, it won't start httpd because it doesn't know how to do it. You can fix this by adding some metadata to the playbook:
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```
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\- name: Serve our file using httpd
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hosts: all
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vars:
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ansible_bender:
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base_image: fedora:30
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target_image:
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name: our-httpd
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cmd: httpd -DFOREGROUND
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tasks:
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- name: Install httpd
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package:
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name: httpd
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state: installed
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- name: Listen on all network interfaces.
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lineinfile:
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path: /etc/httpd/conf/httpd.conf
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regexp: '^Listen '
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line: Listen 0.0.0.0:80
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- name: Copy our file to httpd’s webroot
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copy:
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src: our-file.txt
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dest: /var/www/html
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```
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Now you can build the image (from here on, please run all the commands as root—currently, Buildah and Podman won't create dedicated networks for rootless containers):
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```
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# ansible-bender build the-playbook.yaml
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PLAY [Serve our file using httpd] ****************************************************
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TASK [Gathering Facts] ***************************************************************
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ok: [our-httpd-20191004-131941266141-cont]
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TASK [Install httpd] *****************************************************************
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loaded from cache: 'f053578ed2d47581307e9ba3f64f4b4da945579a082c6f99bd797635e62befd0'
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skipping: [our-httpd-20191004-131941266141-cont]
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TASK [Listen on all network interfaces.] *********************************************
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changed: [our-httpd-20191004-131941266141-cont]
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TASK [Copy our file to httpd’s webroot] **********************************************
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changed: [our-httpd-20191004-131941266141-cont]
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PLAY RECAP ***************************************************************************
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our-httpd-20191004-131941266141-cont : ok=3 changed=2 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0
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Getting image source signatures
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Copying blob sha256:4650c04b851c62897e9c02c6041a0e3127f8253fafa3a09642552a8e77c044c8
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Copying blob sha256:87b740bba596291af8e9d6d91e30a01d5eba9dd815b55895b8705a2acc3a825e
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Copying blob sha256:82c21252bd87532e93e77498e3767ac2617aa9e578e32e4de09e87156b9189a0
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Copying config sha256:44c6dc6dda1afe28892400c825de1c987c4641fd44fa5919a44cf0a94f58949f
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Writing manifest to image destination
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Storing signatures
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44c6dc6dda1afe28892400c825de1c987c4641fd44fa5919a44cf0a94f58949f
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Image 'our-httpd' was built successfully \o/
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```
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The image is built, and it's time to run the container:
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```
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# podman run our-httpd
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AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 10.88.2.106. Set the 'ServerName' directive globally to suppress this message
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```
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Is your file being served? First, find out the IP of your container:
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```
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# podman inspect -f '{{ .NetworkSettings.IPAddress }}' 7418570ba5a0
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10.88.2.106
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```
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And now you can check:
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```
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$ curl <http://10.88.2.106/our-file.txt>
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Ansible is ❤
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```
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What were the contents of your file?
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This was just an introduction to building container images with Ansible. If you want to learn more about what ansible-bender can do, please check it out on [GitHub][3]. Happy building!
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/19/10/building-container-images-ansible
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作者：[Tomas Tomecek][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/tomastomecek
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/blocks_building.png?itok=eMOT-ire (Blocks for building)
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[2]: https://www.ansible.com/
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[3]: https://github.com/ansible-community/ansible-bender
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