This documentation should fill the need for users that wish to backup and restore their installations. While there are certainly other methods to trigger this process - and many caveats - this should give users more confidence as to how to approach the general problem.
Closes#4180
# History
## 0.22.0
Install/update via the bootstrap script:
```shell
wget https://raw.githubusercontent.com/dokku/dokku/v0.22.0/bootstrap.sh
sudo DOKKU_TAG=v0.22.0 bash bootstrap.sh
```
See the [0.22.0 migration guide](/docs/appendices/0.22.0-migration-guide.md) for more information on migrating to 0.22.0.
### Bug Fixes
- #4204: @josegonzalez Ensure the image is not an empty string
- #4198: @josegonzalez Reference extracted Procfile
- #4194: @josegonzalez Drop appName check in apps:report
- #4183: @josegonzalez Embed pb.UnimplementedGreeterServer to avoid linting issues
- #4182: @josegonzalez Upgrade herokuish to fix nodejs tests
- #4173: @karimsan Add build-essential to Vagrant provision
- #4181: @josegonzalez Conditionally mount the dokku-arch folder if it exists
- #4130: @josegonzalez Clear proxy configs on boot
- #4131: @josegonzalez Bump minimum docker version
- #4123: @fomojola Support for expected CHECKS text with special characters
- #4115: @josegonzalez Add missing labels to built images
- #4116: @Schlepptop Ensure config:clear an be called
### New Features
- #4209: @josegonzalez Add experimental support for Cloud Native Buildpacks (CNB)
- #4210: @josegonzalez Add migration guide link to release notes
- #4203: @josegonzalez Cleanup log output for failure case
- #4208: @ankane Add ability to change the access log format
- #4202: @josegonzalez Schedule related images for cleanup when retiring containers
- #4197: @josegonzalez Retire intermediate containers after use
- #4128: @fomojola Added the container index to the network-compute-ports trigger
- #4191: @josegonzalez Create codeql-analysis.yml
- #4139: @Yihao-G Allow controlling Nginx proxy-buffer-size, proxy-buffering, proxy-buffers, proxy-busy-buffers-size
- #4156: @ltalirz When `cert:add` remove previous cert before copying the new cert
- #4129: @josegonzalez Prohibit non-dns names for apps and process types
- #4125: @josegonzalez Allow customizing the various nginx templates
- #4121: @josegonzalez Add ability to disable custom ninx.conf.sigil extraction
### Refactors
- #4160: @nerg4l Rewrite logs plugin in Go
- #4149: @josegonzalez Rewrite ps plugin in golang
- #4080: @hugopeixoto Stop using VHOST when listing app domains and urls
- #4117: @josegonzalez Rewrite app-json plugin in golang
- #4113: @josegonzalez Drop herokuish release code
### Documentation
- #4196: @josegonzalez Correctly doc apps:report output
- #4195: @luizpicolo Fix whitespace in process-management docs
- #4184: @badsyntax Add note regarding using plugin triggers instead of sourcing functions
- #4188: @fomojola Added the autosync community plugin
- #4187: @nahtnam Add `-p` flag to "Run on External Volume" tutorial
- #4186: @badsyntax Add dokku-discourse to community plugins list
- #4170: @chrisjsimpson Add note on how to enable buildkit usage
- #4168: @josegonzalez Revert "The default branch for ruby-getting-started is 'main', not 'master"
- #4167: @nateww The default branch for ruby-getting-started is 'main', not 'master
- #4135: @znz Fix broken table
- #4140: @swrobel Note Ubuntu 20.04 support in README
- #4136: @hugopeixoto Update push command for sample app in docs
- #4124: @josegonzalez Note that docker options require app rebuilds
- #4098: @carlosgeos Add a note on how nginx handles load balancing
- #4111: @josegonzalez Add large version of dokku image
- #4100: @turicas Fix markdown syntax in nginx docs
### Other
- #4201: @dependabot-preview[bot] chore(deps): bump jetty-servlet from 9.4.34.v20201102 to 9.4.35.v20201120 in /tests/apps/java
- #4200: @dependabot-preview[bot] chore(deps-dev): bump heroku/heroku-buildpack-php from 183 to 185 in /tests/apps/php
- #4189: @dependabot-preview[bot] chore(deps): bump thin from 1.7.2 to 1.8.0 in /tests/apps/ruby
- #4175: @dependabot-preview[bot] chore(deps): bump jetty-servlet from 9.4.33.v20201020 to 9.4.34.v20201102 in /tests/apps/java
- #4172: @dependabot-preview[bot] chore(deps): bump github.com/golang/protobuf from 1.4.2 to 1.4.3 in /tests/apps/gogrpc
- #4185: @dependabot-preview[bot] chore(deps): bump socket.io from 2.3.0 to 3.0.1 in /tests/apps/.websocket.disabled
- #4190: @dependabot-preview[bot] chore(deps-dev): bump heroku/heroku-buildpack-php from 182 to 183 in /tests/apps/php
- #4165: @dependabot-preview[bot] chore(deps): bump jetty-servlet from 9.4.31.v20200723 to 9.4.33.v20201020 in /tests/apps/java
- #4153: @dependabot-preview[bot] chore(deps-dev): bump heroku/heroku-buildpack-php from 181 to 182 in /tests/apps/php
- #4144: @dependabot-preview[bot] chore(deps-dev): bump heroku/heroku-buildpack-php from 180 to 181 in /tests/apps/php
- #4137: @dependabot-preview[bot] chore(deps-dev): bump heroku/heroku-buildpack-php from 179 to 180 in /tests/apps/php
- #4118: @dependabot[bot] chore(deps): bump django from 3.0.2 to 3.0.7 in /tests/apps/dockerfile-release
- #4103: @dependabot-preview[bot] chore(deps-dev): bump heroku/heroku-buildpack-php from 178 to 179 in /tests/apps/php
- #4091: @dependabot-preview[bot] chore(deps): bump jetty-servlet from 9.4.30.v20200611 to 9.4.31.v20200723 in /tests/apps/java
This change adds a new builder - builder-cnb - via the 'DOKKU_CNB_EXPERIMENTAL' environment variable. While support for customizing pack builds is not currently implemented and there may be other missing functionality, this initial implementation allows folks to start playing with CNB.
Future releases of Dokku will provide tighter CNB integration and eventually switch to CNB for default building, as well as allow users to better select builders needed for their applications.
All new code for CNB support should be considered experimental and subject to change as the support evolves over time.
If the containers no longer exist and the images are unused, we should remove the images as well.
Note that images may sometimes stick around for a little while, depending on the retire schedule and the wait time specified for the container.
Closes#4104
