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+Image tagging and update strategy for CaaSP 4.0
+
+| Field  | Value      |
+|:-------|:-----------|
+| Status | Draft      |
+| Date   | YYYY-MM-DD |
+
+## Introduction
+
+>This section targets end users, operators, PM, SEs and anyone else that might
+> need a quick explanation of your proposed change.
+
+CaaSP has always been running some of its components using containers. Container
+images in the past have always been delivered via RPM packages. On
+CaaSP all packages are managed by the `transactional-update` tool. This
+technology requires nodes to be rebooted every time a new package is installed.
+The update mechanism of CaaSP, both for RPMs and for container images, has been
+designed around that.
+
+Starting from v4 all the container images are going to be distributed using the
+SUSE registry. That means RPM packages are not going to be used to install and
+update containers.
+
+Due to this change we have to revisit the update story for container images.
+
+
+
+Before we proceed into the details of this RFC, it's important to outline how
+our images are being tagged.
+
+All our images are built inside of the build service and have at least two tags
+associated with them:
+
+  * **short:** `<app-version>` this is something like: `2.6.1`
+  * **intermediate:** `<app-version>-<image-version>` this is something like:
+    `2.6.1-1`. This value is hard-coded into the KIWI image definition; image
+    owners are going to bump it manually.
+  * **long:** `<app-version>-<image-version>-<buildID>`. The `buildID` is a
+    value automatically generated by the Open Build Service. This tag would be
+    something like `2.6.1-1.100`. Note well the `buildID` changes after each
+    build and is specific to the project where the image is being built.
+    To be more explicit: the same image built inside of the `Devel:CaaSP`
+    project will have different numbers compared to very same one built inside
+    of `SUSE:CaaSP`.
+
+### Problem description
+
+> Why do we want this change and what problem are we trying to address?
+
+Starting with v4 the need to reboot a node to get newer container images is no
+longer needed: images can be pulled from the registry on demand.
+
+How should CaaSP images be updated? We think some kind of updates could be done
+in a fully automated way (no user interaction), while others would still need
+some level of coordination; hence, they should not be done in an automated
+fashion.
+
+These are the possible scenarios that lead to the update of a container image:
+
+  1. Development team updates the *"core"* application of the image (eg: `MariaDB`
+     going from version `1.2.3` to `1.3.0`). All the tags of the image would
+     change: short, intermediate and long.
+  2. Development team keeps the *"core"* application to the same version but fixes
+     an image specific bug (a misconfiguration, a bug inside of the entrypoint,
+     ...). The short tag would not change. The intermediate and long ones would.
+  3. Maintenance team publishes an automatic rebuild of the image: the **"core"**
+     application isn't changing, one or more of its dependencies are rebuilt
+     (eg: a `libopenssl` CVE issue). Only the long tag would change.
+  4. Maintainer of the *"core"* application releases a regular SLE update of the
+     application. The container image is automatically rebuilt. This case should
+     be handled carefully: the image tags won't match the core application
+     version. We expect only patch release of the *"core"* application to be
+     released in this way. In theory this kind of upgrades should not break the
+     usage of the container image.
+
+Finally, this RFC intends to set rules about how to reference images inside of
+CaaSP.
+
+With v3 the container images are referenced in two ways:
+
+  * Images running on the admin node: their exact tag is calculated on every boot,
+    based on the latest tag that is available on the node.
+  * Images running on the CaaSP cluster: the exact tag is hard-coded into the
+    `kubernetes-salt` package. A reboot of the admin node is needed to get the
+    manifest files with the new numbers, a whole cluster update is needed to
+    have salt propagate the new manifest files and trigger the usage of the
+    new container images.
+
+With v4 we are still going to ship the kubernetes manifest files via two regular RPMs.
+The only difference compared to v3 is that we are going to hard-code the tags of
+all the images, including the ones running on the admin node.
+
+We want to reference images using a version instead of a fixed tag like `latest`
+or `stable`. This makes easier for a customer to roll back to a previous release
+if something goes wrong. It also makes easier to understand which version of the
+images are being used across the whole cluster
+(`latest`/`stable` can have different meanings across nodes).
+
+
+To summarize, these are the questions we want to address with this RFC:
+
+  * How should CaaSP images be updated with the first release of v4? We think
+    some kind of updates could be done in a fully automated way (no user
+    interaction), while others would still need some level of coordination.
+  * How should we reference images, via their short, intermediate
+    or long tags?
+
+### Proposed change
+
+> A brief summary of the proposed change - the 10,000 ft view on what it will
+> change once this change is implemented.
+
+We are proposing the following upgrade policies (please look at the previous
+section for a detailed explanation of the different cases):
+
+  * Case #1 - core application upgrade: we want to be fully in charge of that.
+    New salt states and kubernetes manifests must be available on the admin node
+    before we can use these images. They cannot be automated.
+  * Case #2 - same core application upgrade, only fixes to the image: in some
+    corner cases we could still need changes to the salt states and/or the
+    kubernetes manifests. Hence, they cannot be automated.
+  * Case #3 - maintenance update: no changes needed neither to salt states nor
+    to kubernetes manifests. These can be automated.
+  * Case #4 - update of core application via SLE maintainer: we think the best
+    solution to this scenario is to have the maintenance QA block this automatic
+    rebuild of the image from being published. They should notify the development
+    team about this core application upgrade so that everything can fall back to
+    case #1.
+
+It's important to point out that we are not looking for the perfect solution,
+we are looking for something that allows us to release CaaSP 4.0 on time,
+without introducing technical debt, without making the whole upgrade story worse
+than the one of v3 and without having to write that much code.
+
+V3 already has some limits, we are fine keeping them around for 4.0:
+
+  * Nodes have to be rebooted to get latest images.
+  * Admin nodes images are always using the latest version available on the
+    node.
+  * Nodes are rebooted even when not actually needed: images are delivered via
+    RPMs, when a new velum image is published all the nodes of the cluster are
+    going to be rebooted even if the only one that actually needs this package
+    is the admin node.
+  * Kubernetes add-ons (dex, tiller, kubedns) are currently referenced by their
+    short tag.
+  * Kubernetes daemon-sets (flannel) are referenced by their short tag.
+  * Static pods on the Kubernetes nodes (haproxy) are referenced by their
+    short tag.
+  * The short tag consists only of the version of the core application shipped
+    inside of the image. If the image is rebuilt due to a bug or a security fix
+    the short tag won't change. The usage of short tags can lead customers to
+    run unpatched images or bugged ones without being aware of that.
+
+The proposed solution for 4.0 is going to keep some of these limitations (reboots)
+but is going to improve the security aspects.
+
+## Detailed RFC
+
+> In this section of the document the target audience is the dev team. Upon
+> reading this section each engineer should have a rather clear picture of what
+> needs to be done in order to implement the described feature. 
+
+### Changes for image building
+
+Images are going to have 3 tags:
+
+  * **short:** this is the core application version. For example, given `2.6.2`
+    is the version of the `docker-registry` application, the short tag of its
+    image is going to be `2.6.2`.
+  * **intermediate:** this is core application version plus the image revision
+    number. The revision number is written into the KIWI spec file, it's updated
+    manually by the developers every time a fix is done to the image.
+    The intermediate tag for the first iteration of docker-registry image
+    would be `2.6.2-rev1`.
+  * **long:** intermediate tag + build numbers generated by the Open Build
+    Service. The long tag for the first iteration of docker-registry image
+    would be something like `2.6.2-rev1+5.1`, where `5.1` are numbers that
+    are automatically incremented by the Open Build Service every time the
+    image is built.
+
+Images are going to be pushed to the SUSE registry, they are not going to be
+wrapped into RPMs anymore.
+
+We will keep using a post-build hook on the build service to create an RPM file
+per image: `<container-image-name>-metadata`. This RPM file will have a simple
+text file inside of it with the metadata of the image (like all its tags).
+
+The contents of the file are not actually useful, the purpose of this RPM is
+to allow us to keep using the current upgrade mechanism of CaaSP v3 that relies
+on the assumption that container image upgrades are delivered via RPMs.
+
+Everything is going to be explained by the remaining parts of the document.
+
+To summarize, given the `velum` image, the Open Build Service will create the
+following artifacts:
+
+  * Native container image: pushed to SUSE registry.
+  * `velum-container-image-metadata` RPM package: has the simple text file
+    described above, it's pushed to the usual update channel of CaaSP.
+
+### Changes for `caasp-manifest` package
+
+This is the package that includes the manifest files of all the pods that are
+running on the admin node. The files are installed under `/usr/share/caasp-container-manifests`.
+The package provides also a service that is run at boot time.
+
+The service reads the template file shipped by the package and writes the
+rendered output to `/etc/kubernetes/manifests`. This location is monitored by
+kubelet which will take care of starting the pods.
+
+The `caasp-manifest` package will be changed to:
+
+  * No longer provide template files.
+  * Install all the manifest files under `/etc/kubernetes/manifests`.
+  * All the images mentioned inside of the manifest files will have a specific
+    tag already hard-coded.
+  * All the images are going to be referenced by using their intermediate tag.
+  * All the manifests will enforce kubelet to use the "always pull" policy.
+  * The service that previously rendered the template files and wrote them
+    under `/etc/` is no longer needed: it must be dropped from the package.
+
+### Changes for the `kuberentes-salt` package
+
+All the Kubernetes add-ons (dex, tiller, kubedns), "static" pods (haproxy)
+and daemon sets (flannel) are shipped via the `kubernetes-salt` package.
+
+All these manifest files must be changed in the following way:
+
+  * Reference all the images using their intermediate tag
+  * Use the "always pull" policy
+
+### Changes for the base operative system
+
+This section describes the changes that have to be done to the underlying
+operative system. We basically have to alter it's package selection.
+That will require changes to our KIWI templates (the ones used to create
+ISOs, qcows,...) and to our package patters.
+
+The following changes have to be made:
+
+  * Remove container-feeder
+  * Remove all the RPMs that are providing the pre-built container images.
+  * Add all the RPMs that are providing the container image metadata files
+    (`velum-container-image-metadata`, `dex-container-image-metadata`, ...).
+
+## Upgrade scenarios on the admin node
+
+This section will describe all the possible upgrade scenarios involving container
+images that can happen on the admin node.
+
+For each one of them we will illustrate what is going to happen and their
+eventual limitations/risks.
+
+### New image is released
+
+This happens with one of the following cases:
+
+  * Core application version changes: new set of tags are created (short,
+    intermediate, long).
+  * Core application version doesn't change, a fix is done to the image
+    (eg: its entrypoint is fixed): short tag doesn't change, intermediate and
+    long tags change.
+
+Behind the scenes:
+
+  * [developers] Update KIWI definition of the image
+  * [developers] Update the `caasp-manifest` package: the manifest file that
+    uses the image has to reference the new intermediate tag (which is constant
+    and always predictable).
+  * [QA] Test the fresh image. The stability and predictability of the
+    intermediate tags makes their life easier and reduces the chances of
+    mistakes.
+  * Image is published to the SUSE registry.
+  * `caasp-manifest` and `<image>-metadata` packages are published to the
+    CaaSP Updates channel.
+
+Considerations about the images:
+
+  * The old image can still be pulled via its intermediate and long tags.
+  * Using the short tag will pull the new image.
+  * The new image can also be pulled using its intermediate and long tags.
+
+What happens before `transactional-update` is run:
+
+  * If the pod running the container image dies:
+    * kubelet will automatically restart the pod
+    * The manifest file is still referencing the old image: the intermediate tag
+      used is the one of the old image.
+    * The "always pull" policy will force the container engine to look for a
+      newer version of the old image.
+    * The pod starts immediately using the old image.
+  * If the admin node is rebooted: same outcome of the scenario above.
+
+When `transactional-update` is run:
+
+  * `transactional-update` notices there are package update
+    available on all the nodes of the cluster.
+  * `transactional-update` creates a new snapshot with the updated packages
+    installed and sets the "has updates" grain on each node of the cluster.
+  * Velum notices the value of the grain on the admin node: the
+    *"update admin node"* button is shown.
+
+What happens if the old container pod dies before the admin node is rebooted:
+
+  * kubelet will automatically restart the pod
+  * The manifest file is still referencing the old image: the intermediate tag
+    used is the one of the old image.
+  * The "always pull" policy will force the container engine to look for a
+    newer version of the old image.
+  * The pod starts immediately using the old image.
+
+When the admin node is rebooted:
+
+  * The new manifest files are in place, they reference the intermediate tag of
+    the new image.
+  * The new image is pulled from the registry.
+  * Velum will allow the user to press the "update nodes" button. This update
+    is not needed by the nodes of a cluster, it's just a waste of time. This is
+    a limitation affecting CaaSP since v1.
+
+### Automatic image rebuild
+
+This happens when the image is rebuilt because one of its dependencies got
+updated (eg: a `libopenssl` issue).
+
+Behind the scenes:
+
+  * [developers] Nothing is done.
+  * [QA] Test the fresh image.
+  * Image is published to the SUSE registry.
+  * `<image-name>-metadata` package is published to the CaaSP Updates channel.
+
+Considerations about the images:
+
+  * The old image can still be pulled via its long tag.
+  * Using the short or intermediate tag will pull the new image.
+  * The new image can also be pulled using its long tag.
+
+What happens before `transactional-update` is run:
+
+  * If the pod running the container image dies:
+    * kubelet will automatically restart the pod
+    * The "always pull" policy will force the container engine to look for a
+      newer version of the old image.
+    * The container engine pulls the new image because it has the same intermediate tag
+      as the old one.
+    * The pod starts using the new image as soon as image pull is done.
+  * If the admin node is rebooted: same outcome of the scenario above.
+
+> **Warning:** this behaviour could lead to a potential service disruption. When
+> the container dies it won't immediately be restarted, this will happen only
+> after the new image is pulled from the registry. Pulling an image takes an
+> amount of time that depends on the size of the image and the network bandwidth.
+>
+> The impact of this issue can be reduced by configuring all the nodes of the
+> cluster to use a local mirror of the SUSE registry.
+
+When `transactional-update` is run:
+
+  * `transactional-update` notices there are package update
+    available on all the nodes of the cluster.
+  * `transactional-update` creates a new snapshot with the updated packages
+    installed and sets the "has updates" grain on each node of the cluster.
+  * Velum notices the value of the grain on the admin node: the
+    *"update admin node"* button is shown.
+
+What happens if the old container pod dies before the admin node is rebooted:
+
+  * kubelet will automatically restart the pod
+  * The "always pull" policy will force the container engine to look for a
+    newer version of the old image.
+  * The container engine pulls the new image because it has the same intermediate tag
+    as the old one.
+  * The pod starts using the new image as soon as image pull is done.
+
+**Note well:** this is the same issue illustrated above under *"what happens before
+`transactional-update` is run if..."*. The same mitigation technique is going
+to help with this scenario as well.
+
+When the node is rebooted:
+
+  * The "always pull" policy will force the container engine to look for a
+    newer version of the old image.
+  * The container engine pulls the new image because it has the same intermediate tag
+    as the old one.
+  * The pod starts using the new image as soon as image pull is done.
+
+The whole node is rebooting, so no unexpected service disruption happens.
+
+## Upgrade scenarios for kubernetes-related container images.
+
+This section will describe all the possible upgrade scenarios involving container
+images that are running on the kubernetes master and worker nodes.
+
+There are three types of container workloads to consider:
+
+  * Containers deployed as native Kubernetes deployment objects: these include
+    services like dex, kubedns, tiller and many others.
+  * Containers deployed as native Kubernetes daemon sets: this - at the time of
+    writing - includes only the cilium and flannel services.
+  * Containers deployed via manifest files: these are files managed by salt,
+    at the time of writing only HAproxy is being deployed in that way on all
+    the nodes of the cluster.
+
+Upgrading kubernetes daemon sets and static pods poses the same challenges. On
+the other hand, the update of kubernetes deployments workloads has different
+implications. Due to that the next sections will focus on these two kind of
+upgrades.
+
+For each one of them we will illustrate what is going to happen and their
+eventual limitations/risks.
+
+### Upgrade scenarios: kubernetes add-ons
+
+All these workloads are deployed using native *"kubernetes deployment"* objects.
+
+#### New image is released
+
+This happens with one of the following cases:
+
+  * Core application version changes: new set of tags are created (short,
+    intermediate, long).
+  * Core application version doesn't change, a fix is done to the image
+    (eg: its entrypoint is fixed): short tag doesn't change, intermediate and
+    long tags change.
+
+Behind the scenes:
+
+  * [developers] Update KIWI definition of the image
+  * [developers] Update the `kubernetes-salt` package: the manifest file that
+    uses the image has to reference the new intermediate tag (which is constant
+    and always predictable).
+  * [QA] Test the fresh image. The stability and predictability of the
+    intermediate tags makes their life easier and reduces the chances of
+    mistakes.
+  * Image is published to the SUSE registry.
+  * `kubernetes-salt` and `<image>-metadata` packages are published to the
+    CaaSP Updates channel.
+
+Considerations about the images:
+
+  * The old image can still be pulled via its intermediate and long tags.
+  * Using the short tag will pull the new image.
+  * The new image can also be pulled using its intermediate and long tags.
+
+What happens when `transactional-update` is run:
+
+  * `transactional-update` notices there are package update
+    available on all the nodes of the cluster.
+  * `transactional-update` creates a new snapshot with the updated packages
+    installed and sets the "has updates" grain on each node of the cluster.
+  * Velum notices the value of the grain on the admin node: the
+    *"update admin node"* button is shown.
+  * Once the admin node is rebooted, Velum allows the user to press the
+    "update nodes" button
+
+When the update cluster orchestration is done:
+
+  * salt gives Kubernetes a new deployment definition.
+  * The desired state is different from the current one: the image tag
+    referenced by the deployment object is a different one.
+  * Kubernetes will roll out the update. This is not going to cause downtime.
+
+What happens if the old container pod dies before the "update cluster"
+orchestration is run:
+
+  * Kubernetes starts a new pod somewhere in the cluster
+  * The deployment description didn't change yet: the intermediate tag being
+    referenced is still the old one.
+  * A new pod is started, the old container image is being used by it.
+
+
+#### Automatic rebuild
+
+This happens when the image is rebuilt because one of its dependencies got
+updated (eg: a `libopenssl` issue).
+
+Behind the scenes:
+
+  * [developers] Nothing is done.
+  * [QA] Test the fresh image.
+  * Image is published to the SUSE registry.
+  * `<image-name>-metadata` package is published to the CaaSP Updates channel.
+
+Considerations about the images:
+
+  * The old image can still be pulled via its long tag.
+  * Using the short or intermediate tag will pull the new image.
+  * The new image can also be pulled using its long tag.
+
+What happens when `transactional-update` is run:
+
+  * `transactional-update` notices there are package update
+    available on all the nodes of the cluster.
+  * `transactional-update` creates a new snapshot with the updated packages
+    installed and sets the "has updates" grain on each node of the cluster.
+  * Velum notices the value of the grain on the admin node: the
+    *"update admin node"* button is shown.
+  * Once the admin node is rebooted, Velum allows the user to press the "update nodes" button
+
+What happens if the old container pod dies before the "update cluster" orchestration is run:
+
+  * Kubernetes starts a new pod somewhere in the cluster
+  * The "always pull policy" forces the container engine to check if a new
+    version of the image exists.
+  * The new image is pulled from the registry because the intermediate tag
+    didn't change.
+  * The pod is started as soon as the image pull is completed.
+
+No downtime is going to be faced by the user even if the container engine has
+to pull the image from scratch. That happens because all our deployments are made
+by more than one replica, hence the requests are automatically routed to the
+other pods erogating the service.
+
+When the update cluster orchestration is done:
+
+  * The deployment definition will **not** change: the intermediate tag didn't
+    change.
+  * The nodes of the clusters are going to be rebooted due to the update of the
+    `<image>-metadata` package.
+  * The reboot of the nodes will lead kubernetes to schedule the pod somewhere
+    else on the cluster.
+  * The "always pull policy" will cause the new pod to start using the new image.
+
+The nodes are rebooted in a controlled fashion by our salt orchestration. Nodes
+are drained, hence no downtime is going to be experienced by the user.
+
+### Upgrade scenarios: static pods and daemon sets
+
+This section focuses on the update of the static pods (eg: HAproxy) and
+kubernetes daemon sets (eg: flannel and cilium).
+
+### New image is released
+
+This happens with one of the following cases:
+
+  * Core application version changes: new set of tags are created (short,
+    intermediate, long).
+  * Core application version doesn't change, a fix is done to the image
+    (eg: its entrypoint is fixed): short tag doesn't change, intermediate and
+    long tags change.
+
+Behind the scenes:
+
+  * [developers] Update KIWI definition of the image
+  * [developers] Update the `kubernetes-salt` package: the manifest file that
+    uses the image has to reference the new intermediate tag (which is constant
+    and always predictable).
+  * [QA] Test the fresh image. The stability and predictability of the
+    intermediate tags makes their life easier and reduces the chances of
+    mistakes.
+  * Image is published to the SUSE registry.
+  * `kubernetes-salt` and `<image>-metadata` packages are published to the
+    CaaSP Updates channel.
+
+Considerations about the images:
+
+  * The old image can still be pulled via its intermediate and long tags.
+  * Using the short tag will pull the new image.
+  * The new image can also be pulled using its intermediate and long tags.
+
+What happens when `transactional-update` is run:
+
+  * `transactional-update` notices there are package update
+    available on all the nodes of the cluster.
+  * `transactional-update` creates a new snapshot with the updated packages
+    installed and sets the "has updates" grain on each node of the cluster.
+  * Velum notices the value of the grain on the admin node: the
+    *"update admin node"* button is shown.
+  * Once the admin node is rebooted, Velum allows the user to press the
+    "update nodes" button
+
+**TODO:** answer these questions:
+
+  * how does the update work, when is the deamon set updated? If we update
+    the daemon set on a non-drained node we will immediately pull the new container
+    image. That could result in a downtime for nodes using flannel (the whole node
+    network stack is not working while the flannel pod is not running).
+  * how is daemon set updated rolled out? does k8s pull the new image before killing
+    the running pod? I doubt so...
+  * when are we updating the static pods? Are we doing that after the node is drained?
+
+The whole point is: we have to drain nodes before touching daemon sets (esp. CNI)
+and static pods. That could be a problem for v3 as well.
+
+### Automatic rebuild
+
+This happens when the image is rebuilt because one of its dependencies got
+updated (eg: a `libopenssl` issue).
+
+Behind the scenes:
+
+  * [developers] Nothing is done.
+  * [QA] Test the fresh image.
+  * Image is published to the SUSE registry.
+  * `<image-name>-metadata` package is published to the CaaSP Updates channel.
+
+Considerations about the images:
+
+  * The old image can still be pulled via its long tag.
+  * Using the short or intermediate tag will pull the new image.
+  * The new image can also be pulled using its long tag.
+
+What happens when `transactional-update` is run:
+
+  * `transactional-update` notices there are package update
+    available on all the nodes of the cluster.
+  * `transactional-update` creates a new snapshot with the updated packages
+    installed and sets the "has updates" grain on each node of the cluster.
+  * Velum notices the value of the grain on the admin node: the
+    *"update admin node"* button is shown.
+  * Once the admin node is rebooted, Velum allows the user to press the "update nodes" button
+
+
+If a running container pod dies before the "update cluster" orchestration is run:
+
+  * kubelet automatically restars the pod on the same node
+  * The "always pull policy" forces the container engine to check if a new
+    version of the image exists.
+  * The new image is pulled from the registry because the intermediate tag
+    didn't change.
+  * The pod is started as soon as the image pull is completed.
+
+> **Warning:** this can lead to a temporary downtime of the node. The length of
+> the downtime depends on the size of the image and the network bandwidth.
+
+This can be mitigated by using an on-premise a mirror of the SUSE registry.
+
+After the update cluster orchestration is done:
+
+  * The deployment definition will **not** change: the intermediate tag
+    didn't change.
+  * The nodes of the clusters are going to be rebooted due to the update of
+    the `<image>-metadata` package.
+  * At boot time the always pull policy will cause the new pod to start using
+    the new image.
+
+The nodes are rebooted in a controlled fashion by our salt orchestration.
+Nodes are drained, hence no downtime is going to be expected by the user.
+
+
+### Dependencies
+
+Highlight how the change may affect the rest of the product (new components,
+modifications in other areas), or other teams/products.
+
+### Concerns and Unresolved Questions
+
+List any concerns, unknowns, and generally unresolved questions etc.
+
+## Alternatives
+
+List any alternatives considered, and the reasons for choosing this option
+over them.
+
+## Revision History:
+
+| Date       | Comment       |
+|:-----------|:--------------|
+| YYYY-MM-DD | Initial Draft |