Installation and configuration

Installation

Important

First need to do setting up the environment. All commands are executed only from superuser.

Mode superuser:

sudo -i

Important

Installation is performed on the control node.

  1. Save the list of previously installed packages before starting the installation, this will allow to painlessly restore the system in case of damage. Run the following commands to do this:

    mkdir -p /tmp/rollback/scheduler
pip3 freeze > /tmp/rollback/scheduler/pip_before.txt

    After that, the directory /tmp/rollback/scheduler will contain the file pip_before.txt with a list of installed applications.

  2. Also save migration versions:

    django-admin showmigrations --settings=scheduler.settings.django_settings > /tmp/rollback/scheduler/migrations.txt

    Where:

    • /tmp/rollback/scheduler/ is file directory;
    • migrations.txt is name of file with migration versions.

  3. Install the Scheduler package:

    • from Python package repository:

      pip3 install scheduler

  4. Save the list of installed packages after installation to be able to roll back changes:

    pip3 freeze > /tmp/rollback/scheduler/pip_after.txt

Note

To install Scheduler on Astra Linux (Smolensk) do following:

  1. Connect the provided repository with AccentOS packages.

  2. Install the package with the command:

    sudo apt install -y aos-scheduler

Installation on two or more controllers

It is need when installing Scheduler on two or more controllers:

  1. to replicate database for each of controllers;
  2. to replicate message broker for each of controllers;
  3. to install a module with the same parameters for each of controllers.

Note

Deleting and diagnostics of the module on each controller is performed in the same way as in the case of one controller.

Configuration

  1. Perform the initial configuration of the module:

    openstack aos configure -n scheduler client

  2. Configure message broker RabbitMQ Server:

    rabbitmqctl add_user aos password
rabbitmqctl add_vhost aos
rabbitmqctl set_permissions -p aos aos ".*" ".*" ".*"
rabbitmqctl set_permissions aos ".*" ".*" ".*"

  3. Create directory for logs with the required permissions:

    mkdir -p /var/log/aos/scheduler
chown -R aos:aos /var/log/aos/scheduler

  1. Copy the sample configuration file, if using non-standard parameters, edit them (for details, see Configuration file):

    cp /etc/aos/aos.conf.example /etc/aos/aos.conf
cp /etc/aos/scheduler.conf.example /etc/aos/scheduler.conf

  2. Create database using MySQL as an example, configure rights, database type and other parameters:

    # Login to the database using the root password
mysql -uroot -p
# Create scheduler database
CREATE DATABASE scheduler;
# Give permission to read, edit, perform any actions on all tables in scheduler database
 GRANT ALL PRIVILEGES ON scheduler.* TO 'aos'@'localhost' IDENTIFIED BY 'password';
 GRANT ALL PRIVILEGES ON scheduler.* TO 'aos'@'%' IDENTIFIED BY 'password';
# Exit the database

  3. Edit section [database] of the configuration file etc/aos/scheduler.conf, for example:

    [database]
url = mysql+pymysql://aos:password@tst.stand.loc:3306/scheduler?charset=utf8

  4. Migrate databases:

    openstack aos db migrate -n scheduler

  5. Enable and start services systemd:

    systemctl daemon-reload
systemctl enable aos-scheduler-api.service
systemctl start aos-scheduler-api.service
systemctl enable aos-scheduler-beat.service
systemctl start aos-scheduler-beat.service
systemctl enable aos-scheduler-worker.service
systemctl start aos-scheduler-worker.service

  6. Create Scheduler API service:

    openstack service create --name scheduler --description "Scheduler Service" scheduler

  7. Create endpoints:

    openstack endpoint create --region RegionOne scheduler internal http://controller:10001
openstack endpoint create --region RegionOne scheduler admin http://controller:10001
openstack endpoint create --region RegionOne scheduler public http://controller:10001

Configuration file

Note

Config file allows to override sections and parameters of common file aos.conf for specific module.

Note

There are no lines with the level logging by default in the file scheduler.conf.example, it is specified if necessary. Level logging is set by default in the general configuration file. More information about the configuration files can be found in the corresponding section.

Configuration file is presented in ini format and consists of the following sections and parameters:

Section Parameter Description Default value
DEFAULT task_locale Local naming of tasks collected by endpoints. For example, en. en
DEFAULT time_zone Time zone for logging process events Celery. Europe/Moscow
api logfile Path to log file of aos-scheduler-api service.  
beat logfile Path to log file of aos-scheduler-beat service.  
beat max_loop_interval Interval between schedule checks. 30
beat sync_every The number of completed tasks before the next synchronization. 60
database url Setting up a connection to database. mysql://aos:pas sword@localhost :3306/scheduler

Important

When changing the parameters of the configuration file, to make them take effect, it is need to perform the procedure described in the section «Updating the configuration file».

Recovery plan

Roll back if the Scheduler plug-in installation or update fails:

  1. Compare versions of migrations in file /tmp/rollback/scheduler/migrations.txt with current. If there are any differences, migrate to the previous version for each of the applications. Migration example:

    django-admin showmigrations --settings=scheduler.settings.django_settings
openstack aos db migrate -n scheduler --migration "timetable 0017_auto_20161206_1023"

  2. Revert to the previous state of the packages:

    cd /tmp/rollback/scheduler
diff --changed-group-format='%>' --unchanged-group-format='' pip_before.txt pip_after.txt > pip_uninstall.txt
diff --changed-group-format='%<' --unchanged-group-format='' pip_before.txt pip_after.txt > pip_install.txt
pip3 uninstall -r pip_uninstall.txt
pip3 install -r pip_install.txt