This is the Nextcloud app for Univention Corporate Server (UCS). This installs, configures and integrates Nextcloud into UCS.
It is a docker based app, not relying on the UCS image.
- registers an LDAP schema
- add extended attributes so availability of Nextcloud to both users and group can be configured in user/group settings → Advanced settings → Nextcloud
- for users also the quota can be configured
- all users are enabled to login by default
- Administrator user has also admin privileges on Nextcloud
- Nextcloud is preconfigured
- PostgreSQL DB
- Base install
- LDAP Backend configuration
- APCu as memcache
- UCS integration
- user settings added: nextcloud enabled and quota
- group settings added: nextcloud enabled
- all users are set to be allowed to login to Nextcloud (login by uid)
- Administrator gets Nextcloud admin privileges
Totally replaces the container. Data and Config are kept, upgrade routine kick off automatically.
Removes container, all data, all system integrations (except Schema)
- UCS's PostgreSQL integration mechanism is being used.
The Dockerfile install the base system (based on Ubuntu 16.04) and copies the Nextcloud files into place. Also file permissions are set accordingly.
Furthermore unattended upgrades are enabled and the web server configured.
The entrypoint is a scrip that starts cron and eventually runs the web server in foreground.
When the UCS admin clicks on install Nextcloud following happens.
The docker container will be created. If one is present, it will be replaced.
The hostname (retrieved from ucr) is saved within the permanent app config dir so setup within the Nextcloud container can do install and most basic configuration.
3. before setup
If a config.php exists, it will be copied from the permanent app folder to the usual destination within Nextcloud.
occ is made executable.
Checks are done whether Nextcloud is installed and being upgraded.
- The data directory (on the permanent app folder) will be created, if not existant, and the permissions will be adjusted.
- The admin password is created and placed as admin.secret in the permanent app conf directory
- Nextcloud is being installed
- Nextcloud is being configured:
- trusted domain
- disabling updatechecker (we rely on UCS AppCenter)
- proxy settings (we're behind a reverse proxy)
- APCu is set as memcache
- cron is configured
- the ldap app is enabled
In any case, a Nextcloud upgrade routine is attempted (it does not do anything if not necessary).
5. after setup
The current config.php is copied to the permanent app config folder.
6. joining UCS (inst)
Nextcloud service added to localhost
Just on UCS Api call / bash method invocation
Checks that some custom UCR variables are set
They also can be used for pre-configuration, however there are no dedicated GUI ways for this.
member of support
It is checked whether
univention-ldap-overlay-memberof is installed to figure out one configuration flag for the Nextcloud LDAP backend.
register LDAP schema
With another single UCS bash method invocation.
Settings for enabling users and groups as well as setting user quota are registered.
configure LDAP backend
Nextcloud's LDAP backend is configured.
all users and groups are whitelisted that are of objectclass
nextcloudEnabledis set to
The login attribute defaults to
The user search attributes default to
uid;givenName;sn;employeeNumber;mailPrimaryAddressand the group search attributes to
The search base for users defaults to
cn=users,LDAP_BASEand for groups to
cn=groups,LDAP_BASE. This means only users or groups underneath those default subtrees are considered. The search base can be changed before the installation by executing
ucr set nextcloud/ldap/baseUsers="your-ldap-subtree"and
ucr set nextcloud/ldap/baseGroups="your-ldap-subtree"on the UCS host or after the installation in the Nextcloud settings via Admin -> LDAP / AD integration -> Advanced -> Directory Settings.
Unless on update or empty
$nextcloud_ucs_modifyUsersFilter all Users resulting by this filter¹ are modified.
nextcloudEnabled is set to
$nextcloud_ucs_userEnabled (defaults to 1) and
nextcloudQuota is set to
$nextcloud_ucs_userQuota(default to empty, i.e. unlimited).
(&(|(&(objectClass=posixAccount) (objectClass=shadowAccount)) (objectClass=univentionMail) (objectClass=sambaSamAccount) (objectClass=simpleSecurityObject) (&(objectClass=person) (objectClass=organizationalPerson) (objectClass=inetOrgPerson))) (!(uidNumber=0)) (!(|(uid=*$) (uid=nextcloud-systemuser) (uid=join-backup) (uid=join-slave))) (!(objectClass=nextcloudUser)))
UCS user Administrator becomes admin
This works by adding this user to the local Nextcloud group "admin" and empowers him to administer Nextcloud.
(This user can give admin rights by adding other Users within the Nextcloud user management to the "admin" group.)
The uninstall script makes sure that UCS is left clean from any Nextcloud tracks. A subsequent install will have a fresh and empty instance.
The Nextcloud service is removed from the localhost (UCS bash method invocation).
Following steps are only done, when
- Nextcloud custom attributes are removed
- Nextcloud system user is removed
- All Nextcloud ucr variables are unset
The Nextcloud PostgreSQL database and user are removed unconditionally, because the database resides on the docker host. The app folder /var/lib/univention-appcenter/apps/nextcloud/ is being deleted. To avoid this a manual backup has been done before (we can automatize it, but whereto?).
On upgrade the Nextcloud docker container is removed and all not-permanent data vanished. Before this, the Nextcloud config is copied to the permanent app config directory.
Subsequently the installation process kicks in. Therefore, all the upgrade switches in that logic :)
Creating a new release
If the Dockerfile changes, you first need to build the image. If not continue with tagging and pushing to docker. Background: the app version on UCS as well as the docker tag should be the same (not a technical necessity, but best practice).
To build the container (from within the dir where the Dockerfile is located, replace $name accordingly):
$ sudo docker build -t $name .
To tag, figure out the docker image id via
sudo docker images, eventually:
sudo docker tag $imageID $repo/$name:$version
and push it
sudo docker push $repo/$name:$version
In the Univention Provider Portal, open the Hamburger menu of the app and click "New app version". Pick the source and the target version and hit "Create". In the app settings go to the "Docker" section and adjust the Docker image (update the tag).
Click the "save" icon and and the app is available in the test app center.
Deploying to App Portal
First, having an account and access to the UCS App Provider portal.
Create a new version
$ make add-version app_ver='11.0.3-0' app_newver='11.0.3-90'
$ make push-files
uploads all files, except
i18n/*/Short Description.html and
i18n/*/Long Description.html, Screenshots and Videos. These text can only be edited manually in the app provider portal. Also logos are not being uploaded.
Uploads go against the current Nextcloud app version as configured in the Makefile.
Create and upload docker image
to create a local build use
$ make docker
in order to trigger a build on the docker hub tag it like
$ git tag "13.0.3-0"
Tag the latest commit with the package name, e.g.
13.0.3-0 and push the tags. An automated build is configured at the docker hub.
$ make push-files
Afterwards, there are still two things that need to be done in the Provider Portal:
- Press the Publish button :)