diff --git a/sources/tech/20191023 Building container images with the ansible-bender tool.md b/sources/tech/20191023 Building container images with the ansible-bender tool.md new file mode 100644 index 0000000000..02aa64607b --- /dev/null +++ b/sources/tech/20191023 Building container images with the ansible-bender tool.md @@ -0,0 +1,154 @@ +[#]: collector: (lujun9972) +[#]: translator: ( ) +[#]: reviewer: ( ) +[#]: publisher: ( ) +[#]: url: ( ) +[#]: subject: (Building container images with the ansible-bender tool) +[#]: via: (https://opensource.com/article/19/10/building-container-images-ansible) +[#]: author: (Tomas Tomecek https://opensource.com/users/tomastomecek) + +Building container images with the ansible-bender tool +====== +Learn how to use Ansible to execute commands in a container. +![Blocks for building][1] + +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. + +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**. + +Here is an example: + + +``` +\- name: Serve our file using httpd +  hosts: all +  tasks: +  - name: Install httpd +    package: +      name: httpd +      state: installed +  - name: Copy our file to httpd’s webroot +    copy: +      src: our-file.txt +      dest: /var/www/html/ +``` + +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. + +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. + +Here's where a tool would help. How about trying **ansible-bender**? + + +``` +`$ ansible-bender build the-playbook.yaml fedora:30 our-httpd` +``` + +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**. + +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: + + +``` +\- name: Serve our file using httpd +  hosts: all +  vars: +    ansible_bender: +      base_image: fedora:30 +      target_image: +        name: our-httpd +        cmd: httpd -DFOREGROUND +  tasks: +  - name: Install httpd +    package: +      name: httpd +      state: installed +  - name: Listen on all network interfaces. +    lineinfile:     +      path: /etc/httpd/conf/httpd.conf   +      regexp: '^Listen ' +      line: Listen 0.0.0.0:80   +  - name: Copy our file to httpd’s webroot +    copy: +      src: our-file.txt +      dest: /var/www/html +``` + +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): + + +``` +# ansible-bender build the-playbook.yaml +PLAY [Serve our file using httpd] **************************************************** +                                                                                                                                                                              +TASK [Gathering Facts] ***************************************************************     +ok: [our-httpd-20191004-131941266141-cont] + +TASK [Install httpd] ***************************************************************** +loaded from cache: 'f053578ed2d47581307e9ba3f64f4b4da945579a082c6f99bd797635e62befd0' +skipping: [our-httpd-20191004-131941266141-cont] + +TASK [Listen on all network interfaces.] ********************************************* +changed: [our-httpd-20191004-131941266141-cont] + +TASK [Copy our file to httpd’s webroot] ********************************************** +changed: [our-httpd-20191004-131941266141-cont] + +PLAY RECAP *************************************************************************** +our-httpd-20191004-131941266141-cont : ok=3    changed=2    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0 + +Getting image source signatures +Copying blob sha256:4650c04b851c62897e9c02c6041a0e3127f8253fafa3a09642552a8e77c044c8 +Copying blob sha256:87b740bba596291af8e9d6d91e30a01d5eba9dd815b55895b8705a2acc3a825e +Copying blob sha256:82c21252bd87532e93e77498e3767ac2617aa9e578e32e4de09e87156b9189a0 +Copying config sha256:44c6dc6dda1afe28892400c825de1c987c4641fd44fa5919a44cf0a94f58949f +Writing manifest to image destination +Storing signatures +44c6dc6dda1afe28892400c825de1c987c4641fd44fa5919a44cf0a94f58949f +Image 'our-httpd' was built successfully \o/ +``` + +The image is built, and it's time to run the container: + + +``` +# podman run our-httpd +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 +``` + +Is your file being served? First, find out the IP of your container: + + +``` +# podman inspect -f '{{ .NetworkSettings.IPAddress }}' 7418570ba5a0 +10.88.2.106 +``` + +And now you can check: + + +``` +$ curl +Ansible is ❤ +``` + +What were the contents of your file? + +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! + +-------------------------------------------------------------------------------- + +via: https://opensource.com/article/19/10/building-container-images-ansible + +作者:[Tomas Tomecek][a] +选题:[lujun9972][b] +译者:[译者ID](https://github.com/译者ID) +校对:[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译,[Linux中国](https://linux.cn/) 荣誉推出 + +[a]: https://opensource.com/users/tomastomecek +[b]: https://github.com/lujun9972 +[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/blocks_building.png?itok=eMOT-ire (Blocks for building) +[2]: https://www.ansible.com/ +[3]: https://github.com/ansible-community/ansible-bender