Description:
ansibleroletripleomodifyimage 1.5.0
TripleO Modify Image
A role to allow modification to container images built for the TripleO project.
Role Variables
.. list-table:: Variables used for modify image
:widths: auto
:header-rows: 1
Name
Default Value
Description
source_image
[undefined]
Mandatory fully qualified reference to the source image to be modified. The supplied Dockerfile will be copied and modified to make the FROM directive match this variable.
modify_dir_path
[undefined]
Mandatory path to the directory containing the Dockerfile to modify the image
modified_append_tag
date +-modified-%Y%m%d%H%M%S
String to be appended after the tag to indicate this is a modified version of the source image.
target_image
[undefined]
If set, the modified image will be tagged with target_image + modified_append_tag. If target_image is not set, the modified image will be tagged with source_image + modified_append_tag. If the purpose of the image is not changing, it may be enough to rely on the source_image + modified_append_tag tag to identify that this is a modified version of the source image.
.. list-table:: Variables used for yum update
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:header-rows: 1
Name
Default Value
Description
source_image
[undefined]
See modify image variables
modified_append_tag
date +-modified-%Y%m%d%H%M%S
See modify image variables
target_image
''
See modify image variables
rpms_path
''
If set, packages present in rpms_path will be updated but dependencies must also be included if required as yum
is called with localupdate.
update_repo
''
If set, packages from this repo will be updated. Other repos will only be used for dependencies of these updates.
yum_repos_dir_path
None
Optional path of directory to be used as /etc/yum.repos.d during the update
yum_cache
None
Optional path to the host directory for yum cache during the update.
Requires an overlay-enabled FS that also supports SE context relabling.
force_purge_yum_cache
False
Optional argument that tells buildah to forcefully re-populate the yum
cache with new contents.
.. list-table:: Variables used for yum install
:widths: auto
:header-rows: 1
Name
Default Value
Description
source_image
[undefined]
See modify image variables
modified_append_tag
date +-modified-%Y%m%d%H%M%S
See modify image variables
target_image
''
See modify image variables
yum_packages
[]
Provide a list of packages to install via yum
yum_repos_dir_path
None
Optional path of directory to be used as /etc/yum.repos.d during the update
.. list-table:: Variables used for dev install
:widths: auto
:header-rows: 1
Name
Default Value
Description
source_image
[undefined]
See modify image variables
modified_append_tag
date +-modified-%Y%m%d%H%M%S
See modify image variables
target_image
''
See modify image variables
refspecs
[]
An array of project/refspec pairs that will be installed into the generated container. Currently only supports python source projects.
python_dir
[]
Directory which contains a Python project ready to be installed with pip.
Requirements
ansible >= 2.4
python >= 2.6
Dependencies
None
Warnings
On-disk repositories
....................
Please ensure the SELinux label for the on-disk repositories are correct.
Depending on your container-selinux (and podman) version, you may face issues.
Some examples of a correct type:
system_u:object_r:rpm_var_cache_t
system_u:object_r:container_file_t
First one matches the one of /var/cache/dnf, and is accessible from within a
container, while the second one may allow a container to actually write in
there.
Directories located in the user's home
......................................
You may want to avoid pointing to directories in your $HOME when running this
role, especially when it's running from within TripleO client (for instance
with the openstack tripleo container image prepare command). Doing so
may break due to the SELinux labels and permissions associated to your home
directory.
Please use another location, such as /opt, or even /tmp - and double-check the
SELinux labels therein.
Example Playbooks
Modify Image
The following playbook will produce a modified image with the tag
`:latest-modified-<timestamp>` based on the Dockerfile in the custom directory
`/path/to/example_modify_dir`.
.. code-block::
- hosts: localhost
tasks:
- name: include ansible-role-tripleo-modify-image
import_role:
name: ansible-role-tripleo-modify-image
tasks_from: modify_image.yml
vars:
source_image: docker.io/tripleomaster/centos-binary-nova-api:latest
modify_dir_path: /path/to/example_modify_dir
The directory `example_modify_dir` contains the `Dockerfile` which will perform
the modification, for example:
.. code-block::
# This will be replaced in the file Dockerfile.modified
FROM centos-binary-nova-api
# switch to root to install packages
USER root
# install packages
RUN curl "https://bootstrap.pypa.io/get-pip.py" -o "/tmp/get-pip.py"
RUN python /tmp/get-pip.py
# switch the container back to the default user
USER nova
Yum update
~~~~~~~~~~
The following playbook will produce a modified image with the tag
`:latest-updated` which will do a yum update using the host's /etc/yum.repos.d.
Only file repositories will be used (with baseurl=file://...).
In this playbook the tasks\_from is set as a variable instead of an
`import_role` parameter.
.. code-block::
- hosts: localhost
tasks:
- name: include ansible-role-tripleo-modify-image
import_role:
name: ansible-role-tripleo-modify-image
vars:
tasks_from: yum_update.yml
source_image: docker.io/tripleomaster/centos-binary-nova-api:latest
yum_repos_dir_path: /etc/yum.repos.d
modified_append_tag: updated
yum_cache: /tmp/containers-updater/yum_cache
rpms_path: /opt/rpms
.. code-block::
- hosts: localhost
tasks:
- name: include ansible-role-tripleo-modify-image
import_role:
name: ansible-role-tripleo-modify-image
vars:
tasks_from: yum_update.yml
source_image: docker.io/tripleomaster/centos-binary-nova-api:latest
modified_append_tag: updated
rpms_path: /opt/rpms/
Note, if you have a locally installed gating repo, you can add
``update_repo: gating-repo``. This may be the case for the consequent in-place
deployments, like those performed with the CI reproducer script.
Yum install
~~~~~~~~~~~
The following playbook will produce a modified image with the tag
`:latest-updated` which will do a yum install of the requested packages
using the host's /etc/yum.repos.d. In this playbook the tasks\_from is set as
a variable instead of an `import_role` parameter.
.. code-block::
- hosts: localhost
tasks:
- name: include ansible-role-tripleo-modify-image
import_role:
name: ansible-role-tripleo-modify-image
vars:
tasks_from: yum_install.yml
source_image: docker.io/tripleomaster/centos-binary-nova-api:latest
yum_repos_dir_path: /etc/yum.repos.d
yum_packages: ['foobar-nova-plugin', 'fizzbuzz-nova-plugin']
RPM install
~~~~~~~~~~~
The following playbook will produce a modified image with RPMs from the
specified rpms\_path on the local filesystem installed as a new layer
for the container. The new container tag is appened with the '-hotfix'
suffix. Useful for creating adhoc hotfix containers with local RPMs with no
network connectivity.
.. code-block::
- hosts: localhost
tasks:
- name: include ansible-role-tripleo-modify-image
import_role:
name: ansible-role-tripleo-modify-image
vars:
tasks_from: rpm_install.yml
source_image: docker.io/tripleomaster/centos-binary-nova-api:latest
rpms_path: /opt/rpms
modified_append_tag: -hotfix
Dev install
~~~~~~~~~~~
The following playbook will produce a modified image with Python source
code installed via pip. To minimize dependencies within the container
we generate the sdist locally and then copy it into the resulting
container image as an sdist tarball to run pip install locally.
It can be used to pull a review from OpenDev Gerrit:
.. code-block::
- hosts: localhost
connection: local
tasks:
- name: dev install heat-api
import_role:
name: ansible-role-tripleo-modify-image
vars:
tasks_from: dev_install.yml
source_image: docker.io/tripleomaster/centos-binary-heat-api:current-tripleo
refspecs:
-
project: heat
refspec: refs/changes/12/1234/3
modified_append_tag: -devel
or it can be used to build an image from a local Python directory:
.. code-block::
- hosts: localhost
connection: local
tasks:
- name: dev install heat-api
import_role:
name: ansible-role-tripleo-modify-image
vars:
tasks_from: dev_install.yml
source_image: docker.io/tripleomaster/centos-binary-heat-api:current-tripleo
modified_append_tag: -devel
python_dir:
- /home/joe/git/openstack/heat
Note: here, we can use a directory located in the user's home because it's
probably launched by the user.
License
-------
Apache 2.0
License
For personal and professional use. You cannot resell or redistribute these repositories in their original state.
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