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Sysctls the kernel does not namespace, such as `vm.max_map_count`, cannot be set from a pod spec and previously had no answer beyond editing `/etc/sysctl.d` on each host by hand. `scheduler-k3s:node-sysctls:set` now applies them through a privileged daemonset, which reaches nodes joined later and reapplies after a reboot. Sysctls may be scoped to a node profile, with a profile scope inheriting the global values and overriding them on conflict so that every node is covered by exactly one daemonset. Clearing a sysctl stops dokku managing it but does not restore the previous value, which persists until the node reboots.
Dokku
Docker powered mini-Heroku. The smallest PaaS implementation you've ever seen.
Sponsors
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Backers
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Requirements
A fresh VM running any of the following operating systems:
- Ubuntu 22.04 / 24.04 (amd64/arm64) - Any currently supported release
- Debian 11+ (amd64/arm64)
An SSH keypair that can be used for application deployment. If this exists before installation, it will be automatically imported into dokku.
Otherwise, you will need to import the keypair manually after installation using dokku ssh-keys:add.
Installation
To install the latest stable release, run the following commands as a user who has access to sudo:
wget -NP . https://dokku.com/install/v0.38.25/bootstrap.sh
sudo DOKKU_TAG=v0.38.25 bash bootstrap.sh
You can then proceed to configure your server domain (via dokku domains:set-global) and user access (via dokku ssh-keys:add) to complete the installation.
If you wish for a more unattended installation method, see these docs.
Upgrade
View the docs for upgrading from an older version of Dokku.
Documentation
Full documentation - including advanced installation docs - are available online at https://dokku.com/docs/getting-started/installation/.
Support
You can use GitHub Issues, check Troubleshooting in the documentation, or join us on Gliderlabs Slack in the #dokku channel.
Contribution
After checking GitHub Issues, the Troubleshooting Guide or having a chat with us on Gliderlabs Slack in the #dokku channel, feel free to fork and create a Pull Request.
While we may not merge your PR as is, they serve to start conversations and improve the general Dokku experience for all users.
License
MIT License © Jeff Lindsay