Docker powered mini-Heroku. The smallest PaaS implementation you've ever seen. It's a fork of the original dokku. The idea behind this fork is to provide complete solution with plugins covering most use-cases which are stable and well tested.
- Debian-based installation and upgrade!
- Git deploy
- Built-in support for MariaDB, PostgreSQL, MongoDB and Redis databases
- Built-in support for Dockerfile
- Built-in support for service-only applications
- Built-in support for domains and redirects
- Built-in support for TLS and wildcard certificates
- Built-in support for Docker-args and container persistent volumes
- Built-in support for container's TOP
- Built-in support for foreman-based Procfile
- Data volumes with host-based volumes
- Preboot / zero-downtime deploy
- Enter and exec commands in already running containers
- Access-control: deploy only keys
- Create-only application
- HTTP-Basic Auth support
- Simple SSL commands
- SPDY and HSTS
- Configure NGINX listen address and proxy read timeout
- Custom buildstep image
- Support better image tagging (yet compatible with dokku)
- Support for running buildstep-based applications as non-root user
- Integration with dokku-alt-manager (https://github.com/romaninsh/dokku-alt-manager)
- Run dokku-alt in service in docker container (BETA)
- Nginx proxy in container with automatic service reload
- Support for RabbitMQ and Memcached
- Support for custom nginx templates
- Support for application scaling
- Support for
CHECKSas described in https://labnotes.org/zero-downtime-deploy-with-dokku/
- Full and incremental backup
- Application migration
Assumes that you use Ubuntu 14.04 LTS right now. Ideally, you should have a domain ready to point to your host. It's designed for and is probably best to use a fresh VM. The debian package will install everything it needs.
$ sudo bash -c "$(curl -fsSL https://raw.githubusercontent.com/dokku-alt/dokku-alt/master/bootstrap.sh)"
Installing (with force-yes)
Sometimes you may want to install dokku-alt in a completely non-interactive way. Now you can do it. Simply boostrap.sh without terminal:
$ sudo bash -c "$(curl -fsSL https://raw.githubusercontent.com/dokku-alt/dokku-alt/master/bootstrap.sh)" < /dev/null
If you use the bootstrap script from above, at the end it will fireup ruby installation script. Point your browser to
http://<ip>:2000/ and finish configuration.
Set up a domain and a wildcard domain pointing to that host. Make sure
/home/dokku/VHOST is set to this domain. By default it's set to whatever hostname the host has. This file is only created if the hostname can be resolved by dig (
dig +short $(hostname -f)). Otherwise you have to create the file manually and set it to your preferred domain. If this file still is not present when you push your app, dokku will publish the app with a port number (i.e.
http://example.com:49154 - note the missing subdomain).
You'll have to add a public key associated with a username by doing something like this from your local machine:
$ cat ~/.ssh/id_rsa.pub | ssh dokku.me sudo dokku access:add
Upgrade and beta releases
dokku, this script uses the debian packaging system (deb). To upgrade to the latest version, simply execute:
sudo apt-get update && sudo apt-get install dokku-alt.
Alongside the normal (stable) releases we distribute as well beta (bleeding edge). To switch to beta simply execute:
sudo apt-get update && sudo apt-get install dokku-alt-beta. It will replace the stable dokku-alt and switch to beta.
Migration from dokku
It should be possible, it should mostly work, but it's not tested and advised. VPS's are very cheap this days so fire-up new machine and setup
dokku-alt from scratch.
Deploy an App
Now you can deploy apps on your Dokku. Let's deploy the Heroku Node.js sample app. All you have to do is add a remote to name the app. It's created on-the-fly. Note that you must use the username email@example.com:your-repository-name if you used the boostrap.sh script to install dokku-alt.
$ git clone https://github.com/heroku/node-js-sample $ cd node-js-sample $ git remote add dokku firstname.lastname@example.org:node-js-app $ git push dokku master Counting objects: 296, done. Delta compression using up to 4 threads. Compressing objects: 100% (254/254), done. Writing objects: 100% (296/296), 193.59 KiB, done. Total 296 (delta 25), reused 276 (delta 13) -----> Building node-js-app ... Node.js app detected -----> Resolving engine versions ... blah blah blah ... -----> Application deployed: http://node-js-app.progriumapp.com
Right now Buildstep supports buildpacks for Node.js, Ruby, Python, and more. It's not hard to add more, go add more!
Please check the documentation for your particular build pack as you may need to include configuration files (such as a Procfile) in your project root.
It's a web interface to easily manage your dokku-alt instance. To install manager, simply run:
You can enable or disable it anytime:
dokku manager:enable dokku manager:disable
Or even uninstall if you prefer command line access (it will also wipe used database):
Dokku-alt as service in Docker container (BETA)
Dokku-alt can be run using Docker-in-Docker approach (https://github.com/jpetazzo/dind). It requires you to run the dokku-alt container in privileged mode (with full access to host), because dokku-alt uses its own Docker daemon to serve applications. It's still considered beta, but should be pretty safe solution and robust. It's best to use for play with dokku-alt on other not-supported systems (CentOS, RedHat, Debian) or by simply trying how it works.
All dokku-alt services (SSH, Nginx, Dokku daemon) are run in container.
Create persistent data storage
docker run --volume=/home/dokku --volume=/var/lib/docker --name=dokku-alt-data busybox:latest
dokku-alt service in container
docker run -d --name=dokku-alt --hostname=my-domain.com --volumes-from=dokku-alt-data --publish=22:22 --publish=80:80 --publish=443:443 --privileged ayufan/dokku-alt:latest
You can adjust the exposed ports as described in Docker documentation.
dokku-alt logs to see if anything started correctly:
docker logs dokku-alt-demo
At the end, you should see something like this:
dokku.1 | SSH Login: dokku.1 | user: root dokku.1 | password: lfMUjxYEvqpRRLY6 dokku.1 | ip: 10.0.42.1 172.17.2.213 dokku.1 | Starting dokku daemon...
This is a temporary
root password to access the container and add your access keys (using
dokku access:add as described). This password changes every container restart.
To enter the container shell from the server's terminal (the same which is running
dokku-alt) run ssh:
If everything was done right, you should see the container's prompt. By exposing ports in
docker run to the outside world you can also access
To upgrade container to newer version simply kill old container and rerun your
docker run command:
docker kill dokku-alt docker pull ayufan/dokku-alt:latest docker run -d --name=dokku-alt --hostname=my-domain.com --volumes-from=dokku-alt-data --publish=22:22 --publish=80:80 --publish=443:443 --privileged ayufan/dokku-alt:latest
The key feature of
dokku-alt is built-in support for Dockerfiles, the docker build process. It allows you to create more advanced and more repetitive application environments.
Dockerfile simply put
Dockerfile in root of the application,
dokku-alt will detect it and build application according to specification in
Dockerfile-based application can (but not required) expose a web-application port.
dokku-alt will check if port 80, 8080 or 5000 is exposed. If it is, it will update the assigned vhost and reconfigure nginx to forward all incoming traffic.
Using Dockerfile, you can build service-only applications. Simply don't expose any public facing ports.
Example Dockerfile application: https://github.com/ayufan/dokku-alt-phpmyadmin
Nginx and redirects
Dokku-alt has built-in support for additional domains and url redirects. By specifying redirects, any client using that address will automatically be redirected to the first domain assigned to the application.
Dokku commands can be run over ssh. Anywhere you would run
dokku <command>, just run
ssh -t email@example.com <command>
-t is used to request a pty. It is highly recommended to do so.
To avoid the need to type the
-t option each time, simply create/modify a section in the
.ssh/config on the client side, as follows :
Host progriumapp.com RequestTTY yes
Run a command in the app environment
It's possible to run commands in the environment of the deployed application:
$ dokku run node-js-app ls -alh $ dokku run <app> <cmd>
Removing a deployed app
SSH onto the server, then execute:
$ dokku delete myapp
Dokku-alt allows you to create an application before pushing it. It can be useful when you want to specify additional config variables or assign databases. Simply execute:
$ dokku create mynewapp
It's also possible to disable auto-application creation on push. Add to
From now on you will have to do
dokku create before pushing.
Allowing push-access (deploy only) access for dokku
Dokku-alt allows you to add additional public keys to applications. The specific case is to add special deploy-only key, used for example by Countinous Integration (ie. Jenkins). Key added as deploy-only can only be used to
git push specific application. It will not allowed to execute any
dokku commands. You can add an ssh key and give it explicit access to one or many applications.
$ cat .ssh/id_rsa.pub | dokku deploy:allow myapp
Add key remotely:
$ cat .ssh/id_rsa.pub | ssh dokku@dokku deploy:allow myapp
To later revoke key execute:
$ dokku deploy:revoke myapp FINGERPRINT
You can also list all fingerprints allowed to deploy an application:
$ dokku deploy:list myapp
Add a new admin user:
$ cat .ssh/id_rsa.pub | dokku access:add
Revoke permissions for admin user:
$ dokku access:revoke FINGERPRINT
Environment variable management
Typically, an application will require some environment variables to run properly. Environment variables may contain private data, such as passwords or API keys, so it is not recommend to store them in your application's repository.
config plugin provides the following commands to manage your variables:
config <app> - display the config vars for an app config:get <app> KEY - display a config value for an app config:set <app> KEY1=VALUE1 [KEY2=VALUE2 ...] - set one or more config vars config:unset <app> KEY1 [KEY2 ...] - unset one or more config vars
Available environment variables
DOKKU_NGINX_PROXY_READ_TIMEOUT- allows to override
nginx proxy_read_timeout. Default value is set to '60s'. For more info please refer to: http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout.
DOKKU_ENABLE_HTTP_HOST- when set to 1, the application will also serve content on HTTP if HTTPS is enabled
DOKKU_BUILDSTEP_IMAGE- allows you to set a custom buildstep image on per app basis. Image has to be compatible with https://github.com/progrium/buildstep or https://github.com/dokku-alt/progrium-buildstep-dockerfiles. If the images was forked from https://github.com/progrium/buildstep, there might be a small incompatibility: the image is run with
/start webas in orginal
DOKKU_START_CMD- allows you to set a custom start command. The default value is
/startfor buildstep images and
When you successfully deploy an app, you can tag it with a name/version. This lets you quickly roll back to that image in the event of failure in a later deployment.
$ dokku tag:add gitlab v6.9.0 =====> Tagged latest image of dokku/gitlab as v6.9.0 $ dokku tag:list gitlab REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE dokku/gitlab build fc3baf1216d2 4 weeks ago 954.9 MB dokku/gitlab latest fc3baf1216d2 4 weeks ago 954.9 MB dokku/gitlab release fc3baf1216d2 4 weeks ago 954.9 MB dokku/gitlab v6.9.0 fc3baf1216d2 4 weeks ago 954.9 MB $ dokku deploy gitlab release <-- it will deploy GIT head $ dokku deploy gitlab v6.9.0 <-- it will deploy tagged image
Dokku-alt has built-in support for all modern database engines: MariaDB (former MySQL), PostgreSQL and MongoDB. The database image will be downloaded and provisioned when first used.
First create a database:
$ dokku mariadb:create test-db -----> MariaDB database created: test-db
Second link the database to an app:
$ dokku mariadb:link node-js-sample test-db -----> Releasing node-js-sample ... -----> Deploying node-js-sample ... -----> Shutting down old containers =====> Application deployed: http://node-js-sample.ayufan.eu
Verify the application environment variables:
$ dokku config node-js-sample === node-js-sample config vars === DATABASE_URL: mysql2://node-js-sample:random-password@mariadb:3306/test-db
To use a different database engine, simply replace
Preboot / zero-downtime boot
Similar to functionality provided by https://devcenter.heroku.com/articles/labs-preboot
dokku-alt supports zero-downtime. To enable zero-downtime deployment, execute command:
dokku preboot:enable APP. Alongside with preboot, there's a
checks plugin based on https://labnotes.org/zero-downtime-deploy-with-dokku/. For now, it simply checks if the application started serving requests. If the checks module fails, it will not replace the application.
Preboot and checks can be configured using a few environment variables:
- PREBOOT_WAIT_TIME - number of seconds to wait for container boot (default 5s)
- PREBOOT_COOLDOWN_TIME - number of seconds to wait finish container request processing (default 30s)
- DOKKU_CHECKS_WAIT - number of seconds to wait before request retries (default 10s)
- DOKKU_CHECKS_TIMEOUT - number of seconds to wait for each response (default 20s)
- DOKKU_CHECKS_RETRY - number of retries (default 3)
Docker allows you to have persistent data storage. Dokku-alt exposes this feature as Data Volumes. You can create unlimited number of data volumes and any data volume can be attached to unlimited number of apps. Simply create a data volume and specify container paths which you want to be persistant.
First, create a data volume:
$ dokku volume:create shared-test-volume /app/logs /app/tmp /app/uploads -----> Volume created: volume_data_shared-test-volume
Second, link the volume to an app:
$ dokku volume:link node-js-sample shared-test-volume -----> Volume shared-test-volume linked to an aplication: node-js-sample -----> Releasing node-js-sample ... -----> Deploying node-js-sample ... -----> Shutting down old containers =====> Application deployed: http://node-js-sample.ayufan.eu
It is just simple as this.
Dokku-alt allows you to bind host-based volumes in a very simple manner. To use this feature, you have to be logged as
root and then simply type:
dokku volume:create host-based-volume /path/to/host/volume:/path/to/volume/in/container
HTTP-Basic Auth support
Dokku-alt allows you to secure any application with HTTP-Basic Auth. There are a few commands that makes it happen:
htpasswd:add <app> <user> Add http-basic auth user htpasswd:disable <app> Remove http-basic Auth htpasswd:remove <app> <user> Remove user
If you want to enable and add a new user, simply type the command below and when prompted, type your password twice:
dokku htpasswd:add myapp myuser
You can also pipe the password:
echo mypass | dokku htpasswd:add myapp myuser
To revoke user's permission:
dokku htpasswd:remove myapp
To remove HTTP-Basic Auth completely:
dokku htpasswd:disable myapp
Dokku provides easy TLS support out of the box. To enable TLS connection to your application, copy the
.key files into the
/home/dokku/:app/ssl folder (notice, file names should be
server.key, respectively). Redeployment of the application will be needed to apply TLS configuration. Once it's redeployed, the application will be accessible by
https:// (redirection from
http:// is applied as well).
Dokku-alt extends this even further by allowing you to use command line interface for certificates:
ssl:generate <app> Generate certificate signing request for an APP ssl:certificate <app> Pipe signed certifcate with all intermediates for an APP ssl:forget <app> Wipes certificate for an APP ssl:info <app> Show info about certifcate and certificate request ssl:key <app> Pipe private key for an APP
dokku ssl:generate myapp to generate certificate signing request (CSR). At the end of process you will receive
BEGIN CERTIFICATE REQUEST which you can ten copy-n-paste to your SSL signer (ie. http://startssl.com).
When you receive your signed certificate pipe it with ALL INTERMEDIATES to
dokku ssl:certificate myapp. If done correctly you have SSL enabled for your site.
cat mycert.pem intermediate.pem ca.pem | dokku ssl:certificate myapp
If it happens that you have already created certificate you can use it, by piping your UNENCRYPTED your certificate and your private key:
cat mycert.pem intermediate.pem ca.pem | dokku ssl:certificate myapp cat mycert.key | dokku ssl:key myapp
To view asigned certificate:
dokku ssl:info myapp
HTTP Strict Transport Security (HSTS) is a web security policy mechanism whereby a web server declares that complying user agents (such as a web browser) are to interact with it using only secure HTTPS connections. Once enabled all further communication will be done over TLS only, there's no revert mechanism. As this is additional security feature you have to do it by hand. To enable HSTS for site use:
dokku config:set myapp DOKKU_ENABLE_HSTS=1
Serve an app over HTTP as well
dokku-alt for all TLS-enabled apps will create redirects which requires user to use
https://. In some cases it maybe required to allow
http:// access which is potentially insecure. To enable simulatenous HTTP and HTTPS set specific config:
dokku config:set myapp DOKKU_ENABLE_HTTP_HOST=1
You can fine-tune some aspects of Dokku behaviour and its plugins by setting variables in
dokkurc file placed in Dokku root directory – usually
dokkurc is sourced by the main
export DOKKU_DISABLE_AUTO_APP_CREATE=1 export BUILDSTEP_IMAGE="ayufan/dokku-alt-buildstep:foreman"
Known configuration variables
DOKKU_DISABLE_AUTO_APP_CREATE– when set to
1, applications won't be automatically created on push; see Create only application.
BUILDSTEP_IMAGE– buildstep image to be used by Docker, defaults to
MARIADB_IMAGE– Docker image to be used for MariaDB plugin, defaults to
MONGODB_IMAGE– Docker image to be used for MongoDB plugin, defaults to
POSTGRESQL_IMAGE– Docker image to be used for PostgreSQL plugin, defaults to
REDIS_IMAGE– Docker image to be used for Redis plugin, defaults to
DOKKU_LISTEN_IPV4- Set the IPV4 address on which NGINX will listen for requests
DOKKU_LISTEN_IPV6- Set the IPV6 address on which NGINX will listen for requests
DOKKU_FORCE_ENABLE_HSTS- Force to enable HSTS header (validity for one year) for all TLS-enabled apps
DOKKU_DISABLE_NGINX_X_FORWARDED- Disable setting of
X-Forwardedheaders by nginx, useful for CDN installations.
These parameters should only be changed when you are using a MariaDB image that has a different setup.
MARIADB_PORT- MariaDB listen port, defaults to
MARIADB_COMMAND- MariaDB startup command for Docker, defaults to
MARIADB_CONTAINER_VOLUME- Where the data volume gets mounted in the MariaDB container, defaults to
MARIADB_CONTAINER_PASSWORD- Where the password file gets mounted in the MariaDB container, defaults to
These parameters should only be changed when you are using a MongoDB image that has a different setup.
MONGODB_PORT- MongoDB listen port, defaults to
MONGODB_COMMAND- MongoDB startup command for Docker, defaults to
MONGODB_CONTAINER_VOLUME- Where the data volume gets mounted in the MongoDB container, defaults to
MONGODB_CONTAINER_PASSWORD- Where the password file gets mounted in the MongoDB container, defaults to
These parameters should only be changed when you are using a PostgreSQL image that has a different setup.
POSTGRESQL_USER- PostgreSQL admin user, defaults to
POSTGRESQL_PORT- PostgreSQL listen port, defaults to
POSTGRESQL_COMMAND- PostgreSQL startup command for Docker, defaults to
POSTGRESQL_CONTAINER_VOLUME- Where the data volume gets mounted in the PostgreSQL container, defaults to
POSTGRESQL_CONTAINER_PASSWORD- Where the password file gets mounted in the PostgreSQL container, defaults to
These parameters should only be changed when you are using a Redis image that has a different setup.
REDIS_PORT- Redis listen port, defaults to
REDIS_COMMAND- Redis startup command for Docker, defaults to
REDIS_CONTAINER_VOLUME- Where the data volume gets mounted in the Redis container, defaults to
$ dokku help apps:disable <app> Disable specific app apps:enable <app> Re-enable specific app apps:list List app apps:restart <app> Restart specific app (not-redeploy) apps:start <app> Stop specific app apps:status <app> Status of specific app apps:stop <app> Stop specific app apps:top <app> [args...] Show running processes backup:export [file] Export dokku configuration files backup:import [file] Import dokku configuration files config <app> display the config vars for an app config:get <app> KEY display a config value for an app config:set <app> KEY1=VALUE1 [KEY2=VALUE2 ...] set one or more config vars config:unset <app> KEY1 [KEY2 ...] unset one or more config vars delete <app> Delete an application domains:get <app> Get domains for an app domains:redirect:get <app> Get redirect domains for an app domains:redirect:set <app> <domains...> Set redirect app domains domains:set <app> <domains...> Set app domains enter <app> Enter into currently running container exec <app> <cmd> Execute command in currently running container help Print the list of commands logs <app> [-t] [-f] Show the last logs for an application (-t or -f follows) mariadb:console <app> <db> Launch console for MariaDB container mariadb:create <db> Create a MariaDB database mariadb:delete <db> Delete specified MariaDB database mariadb:dump <app> <db> Dump database for an app mariadb:info <app> <db> Display application informations mariadb:link <app> <db> Link database to app mariadb:list <app> List linked databases mariadb:unlink <app> <db> Unlink database from app mongodb:console <app> <db> Launch console for MongoDB container mongodb:create <db> Create a MongoDB database mongodb:delete <db> Delete specified MongoDB database mongodb:dump <app> <db> <collection> Dump database collection in bson for an app mongodb:export <app> <db> <collection> Export database collection for an app mongodb:import <app> <db> <collection> Import database collection for an app mongodb:info <app> <db> Display application informations mongodb:link <app> <db> Link database to app mongodb:list <app> List linked databases mongodb:unlink <app> <db> Unlink database from app plugins-install Install active plugins plugins Print active plugins postgresql:console <app> <db> Launch console for PostgreSQL container postgresql:create <db> Create a PostgreSQL database postgresql:delete <db> Delete specified PostgreSQL database postgresql:dump <app> <db> Dump database for an app postgresql:info <app> <db> Display application informations postgresql:link <app> <db> Link database to app postgresql:list <app> List linked databases postgresql:unlink <app> <db> Unlink database from app preboot:cooldown:time <app> <secs> Re-enable specific app preboot:disable <app> Stop specific app preboot:enable <app> Stop specific app preboot:status <app> Status of specific app preboot:wait:time <app> <secs> Restart specific app (not-redeploy) rebuild:all Rebuild all apps rebuild <app> Rebuild an app redis:create <app> Create a Redis database redis:delete <app> Delete specified Redis database redis:info <app> Display application information run <app> <cmd> Run a command in the environment of an application tag:add <app> <tag> Tag latest running image using specified name tag:list <app> List all image tags tag:rm <app> <tag> Tag latest running image using specified name url <app> Show the URL for an application version Print dokku's version volume:create <name> <paths...> Create a data volume for specified paths volume:delete <name> Delete a data volume volume:info <name> Display volume information volume:link <app> <name> Link volume to app volume:list:apps <name> Display apps linked to volume volume:list List volumes volume:unlink <app> <name> Unlink volume from app
It works for all ranges :)
dokku mariadb:help dokku ssl:help
FAQ / Support
You can use Github Issues.
How can I use custom domains as www.myapp.com?
dokku domains:set myapp www.myapp.com
How do I connect my app to access an external database server?
"I deployed my Rails application on a fresh new machine using dokku-alt but I already own a bare metal, replicated PostgreSQL server that's reachable from the dokku host as it's on the same network. How do I connect?"
Run the following:
dokku config:set <app> DATABASE_URL=postgresql://user:password@dbserver-ip:5432/DBNAME
You have to feed application with your DATABASE_URL. You can even use databases from heroku.
Linking to other containers
You can create file:
/home/dokku/APPNAME/DOCKER_ARGS and fill it with additional arguments as described in http://docs.docker.com/reference/run/. These arguments will be injected when deploying the application or invoking
Out of memory
The following error typically occurs on boxes with 512MB of memory:
runtime: panic before malloc heap initialized fatal error: runtime: cannot allocate heap metadata
Run the following (it will create 512MB swap file, you can adjust it for your needs):
dd if=/dev/zero of=/extraswap bs=1M count=512 mkswap /extraswap
Add it to /etc/fstab:
/extraswap none swap sw 0 0
Turn it on:
Fix Shellshock vulnerability
Shellshock (CVE-2014-6271, CVE-2014-7169, CVE-2014-7186, CVE-2014-7187) is a vulnerability in GNU's bash shell that gives attackers access to run remote commands on a vulnerable system. More info you can find there: https://shellshocker.net/.
sudo dokku plugins-install
If you use Dockerfile you need for every app which uses it redownload image names used by
FROM. Then issue docker pull every image used by FROM:
docker pull ubuntu:trusty. You don't have to do it for buildstep-based images, it were done by
plugins-install. Please check
Dockerfileof the app:
FROM ubuntu:trusty RUN ...
Then run in server's terminal:
docker pull ubuntu:trusty
Rebuild all applications with cache wipe:
- Voila. Your are secure!
- Docker - Container runtime and manager
- Dokku - Orginal Dokku instance
- Buildstep - Buildpack builder
- PostgreSQL - PostgreSQL image
- MariaDB - MariaDB image
- MongoDB - MongoDB image
- Redis - Redis image
- pluginhook - Shell based plugins and hooks
- sshcommand - Fixed commands over SSH