rohitsakala/istio-installer

Istio Installer

This image is used by the rancher-istio chart to intall istio with various configurations.

This installer uses shell scripts to run istioctl install, upgrade and uninstall commands.

Architecture

Uses istioctl and nginx to complete install, upgrade and delete comands for the Istio service mesh.

Overview

This image uses a series of bash scripts to execute istioctl binary comands. The istioctl binary is an Istio configuration command line utility for managing your Istio service mesh.

The current implementation of the istioctl upgrade command makes a call to external github to download Istio manifests to complete the upgrade process. This will fail when running in an airgapped enviornment. To temporarily resolve the issue, this image also uses an nginx server to intercept that call and download the necessary manifest from the docker container. The image bundles the Istio manifests for the versions of Istio that are currently released in a rancher-istio chart.

Making Changes

How to upgrade the istio version

1. In the Dockerfile, change the environmnet variable ENV ISTIO_VERSION to the version of istio that you would like the installer to support.

2. Add the same version of istio that you used for ENV ISTIO_VERSIONto the istio_version_array in the fetch_istio_releases.sh script ordering from least to greatest. When doing this step, you also want to double check that the version that was previously used for ENV ISTIO_VERSION also exists in the istio_version_array. This step ensures upgrades work in airgapped environments.

   In general, the istio_version_array must include all istio versions from the release branches of rancher/charts

   Note: The istio_version_array does not include rancher-istio chart version, just the version of istio that is supported by the rancher-istio chart.

3. Finally, you need to validate that the create_istio_system.sh and the uninstall_istio_system.sh script commands are still valid. This can be done by checking that the istioctl commands have not changed. You should also check the release notes for any significant changes to how istioctl is used. If there were changes to the commands, update the create_istio_system.sh and the uninstall_istio_system.sh scripts accordingly.

Build

The istio-installer image is built using drone when a new tag is created and pushed to repository. See drone.yaml for drone configurations.

When building and tagging the image locally, run docker build -t <your_docker_hub_repo>/istio-installer:<tag> .

How to tag

The istio installer uses the following version format for tags: <x.x.x>-rancher<x>

The <x.x.x> should be set to the version of istio the installer is going to be used for. This can be found in the Dockerfile as the value for the ENV ISTIO_VERSION

The rancher<x> is the build number. This number starts at 1 and increases with each re-tag with the same istio version.`

After all of the changes have been merged into the master branch, fetch a fresh copy of the master branch to your local machine. From there, you can run the following commands to tag and push the tag to the repo

git tag <x.x.x>-rancher<x>
git push <istio_installer_remote_branch> <x.x.x>-rancher<x>

Once the tag is pushed to github, drone will build the docker image and push it to the rancher/istio-installer docker hub repository.

An example tag for a new istio version and push may look like this:

git tag 1.9.6-rancher1
git push upstream 1.9.6-rancher1

If you need to re-tag the same version, that may look like this:

git tag 1.9.6-rancher2
git push upstream 1.9.6-rancher2

Manual Tests

Test the Standlone Docker Image

The first test is to run the docker image on its own (i.e not using the rancher-istio chart to run the image). This will allow you to more quickly find issues relating to the docker image configuration.

1. Build the docker image by running docker build -t <your_docker_hub_repo>/istio-installer:<tag> .

2. Run docker image by running docker run <your_docker_hub_repo>/istio-installer:<tag>.

Check the output for errors and fix them as found.

Test Docker Image Works in Rancher-Istio chart

The second test is to check the docker image in the rancher-istio chart. This will help you identify any permission issues or additional configuration problems that were not identified in the standalone docker image test.

1. Build the docker image by running docker build -t <your_docker_hub_repo>/istio-installer:<tag> . Note: if you already built the image in the previous test, you do not need to build it again.
2. Push your image to docker hub by running docker push <your_docker_hub_repo>/istio-installer:<tag>.
3. Setup a rancher instance (can be single node or HA).
4. Create a large downstream cluster with default settings
5. In your downstream cluster, navigate to Apps & Market >> Charts.
6. Select rancher-istio, and install the latest version of istio (or version of istio that you are creating a bug fix for).
7. Select system project, edit options by disabling kiali (Note: only do this if you have not installed rancher-monitoring), then select eidt yaml and make the following updates to the yaml:

• update the installer.repository: to repository: <your_docker_hub_repo>/istio-installer,
• update the installer.tag: to tag: <tag>
• update the installer.debug.secondsSleep: to secondsSleep: 30

Here is an example of those changes. This is not the entire values.yaml, it is just a small portion of it:

...
installer:
  debug:
    secondsSleep: 30
  releaseMirror:
    enabled: false
  repository: testuser/istio-installer
  tag: v1.0.0
...

8. Click install
9. Navigate to Workload >> Pods >> find the istio-installer pod and view logs to find an issues.
10. If no issues are found while checking the logs, see that the helm-operation results in a succesfull install and continue
11. Navigate to Apps & Marketplace >> Charts, select rancher-istio, click Update, leave default options, click Next, click Update
12. Navigate to Workload >> Pods >> find the istio-installer pod and view logs to see if there are any issues.
13. If there are issues, then Update usually fails.

Test Image Mirror works in Rancher-Istio chart

The second test is to check the docker image in the rancher-istio chart. This will help you identify any permission issues or additional configuration problems that were not identified in the standalone docker image test.

1. Build the docker image by running docker build -t <your_docker_hub_repo>/istio-installer:<tag> . Note: if you already built the image in the previous test, you do not need to build it again.
2. Push your image to docker hub by running docker push <your_docker_hub_repo>/istio-installer:<tag>.
3. Setup a rancher instance (can be single node or HA).
4. Create a large downstream cluster with default settings
5. In your downstream cluster, navigate to Apps & Market >> Charts.
6. Select rancher-istio, and install the latest version of istio (or version of istio that you are creating a bug fix for).
7. Select system project, edit options by disabling kiali (Note: only do this if you have not installed rancher-monitoring), then select eidt yaml and make the following updates to the yaml:

• update the installer.repository: to repository: <your_docker_hub_repo>/istio-installer,
• update the installer.tag: to tag: <tag>
• update the installer.debug.secondsSleep: to secondsSleep: 30

Here is an example of those changes. This is not the entire values.yaml, it is just a small portion of it:

...
installer:
  debug:
    secondsSleep: 30
  releaseMirror:
    enabled: false
  repository: testuser/istio-installer
  tag: v1.0.0
...

8. Click install
9. Navigate to Workload >> Pods >> find the istio-installer pod and view logs to find an issues.
10. If no issues are found while checking the logs, see that the helm-operation results in a succesfull install and continue
11. Navigate to Apps & Marketplace >> Charts, select rancher-istio, click Update, ensure the version in the dropdown is that same as selected on install, click next, and edit yaml to make the following updates:

• update the installer.releaseMirror.enabled to enabled: true.

Here is an example of those changes. This is not the entire values.yaml, it is just a small portion of it:

...
installer:
  debug:
    secondsSleep: 30
  releaseMirror:
    enabled: true
  repository: testuser/istio-installer
  tag: v1.0.0
...

12. Click Update
13. Navigate to Workload >> Pods >> find the istio-installer pod and view logs to see if there are any issues.
14. If there are issues, then Update usually fails.