Monday, May 20, 2019

New docker images for upcoming mageia 7

I have added new docker images for the upcoming mageia 7 release. Thanks to the latest work on our image build tools, the images are available in all architectures mageia 7 supports:
  • x86_64
  • armv7hl
  • aarch64
The images are based on mageia 7 beta3, and will be periodically updated when new releases are available.

Next step, automation.

Friday, May 10, 2019

armv7hl support for mageia docker official images

After some months of on and off work with @Conan-Kudo on improving mageia's docker images build tools to support multi-arch builds, we finally were able to add armv7hl support to mageia 6.

Usage is completely transparent to the user, when pulling the image, the docker daemon will take care to download the correct image according to the host server architecture.

Also, now that our build tools support multiarch builds, the moment mageia 7 is available armv8 images will be available too, at the same time of the x86_64 image.

We are also working on having a periodically updated cauldron build, but we are still working on that. With the latest changes to the build tools it should be easier to automate a cauldron build for example, a weekly or daily.

Sunday, March 17, 2019

Some improvements on my docker simple SMTP relay

I have not done any improvements to one of my first docker containers, a SMTP relay, despite the fact that it has resulted quite popular on docker hub (a 1M+ downloads to date !!). Lately I have done some work and received some pull requests with some improvements that I want to talk about.

The first feature I want to introduce is the addition of rsyslog to enable logging the container output to stdout and to log to remote logging systems. This means that now you can see the logs of the emails being processed by the container on its standard output with the docker logs command.

Also, for the modification of postfix's config file, now instead of using sed to modify it we use the postconf command so it is safer. There are also some new configuration options:

SMTP_PORT 

Added by PR #4. Adds a new variable to configure the server SMTP port to use.


SMTP_HEADER_TAG

Added by PR #7. This will add a header for tracking messages upstream. Helpful for spam filters. It will appear as:
RelayTag: yourheadertag

in the email headers.


SMTP_NETWORKS
Added by PR #12 . This variable will set postfix parameter mynetworks, allowoing you to add additional, comma seperated, subnets to use the relay. The default value allows the following networks:

'10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16'

The value you set will append the entered values to that list, so no need to re-add them to the variable.

Many thanks to all the authors for them !!

Saturday, December 15, 2018

Automating backups of OTRS docker containers

Another missing feature of my OTRS docker containers was the automation of the backup files. OTRS already includes a backup script, and we also included a convenience script that runs that script with default parameter values (full backups, gzip compressed), which you could run on an already running container or automate it from the docker  host using cron and docker exec

This approach wasn't flexible enough and needed configuration on the host side, which in some way goes against the point of containing an application configuration and runtime in one place. 

Backing Up

So now a new feature has been added to configure and run the backup process which can be controlled with the following environment variables:

  • OTRS_BACKUP_TIME: Sets the backup excecution time, in cron format. If set to "disable" automated backups will be disabled.
  • OTRS_BACKUP_TYPE: Sets the type of backup, it receives the same values as the OTRS backup script:
    • fullbackup: Saves the database and the whole OTRS home directory (except /var/tmp and cache directories). This is the default. 
    • nofullbackup: Saves the database and the whole OTRS home directory (except /var/tmp and cache directories).
    • dbonly: Only the database will be saved.
  • OTRS_BACKUP_COMPRESSION: Sets the backup compression method to use, also it receives the same values as the OTRS backup script (gzip|bzip2). The default is gzip.
  • OTRS_BACKUP_ROTATION: Sets the number of days to keep the backup files. The default is 30 days.
So for example, to change the backup time to database only backups, compress them using _bzip2_ and run twice each day set those variables on your docker-compose.yml file like this:

    OTRS_BACKUP_TYPE=dbonly
  OTRS_BACKUP_TIME="0 12,12 * * *"
  OTRS_BACKUP_COMPRESSION=bzip2


This feature is available since the 6.0.15 build.

Restoring

To restore a backup  file (not necessarily created with this container) the following environment variables must be added to docker-compose.yml (or env file if using one as you should do):
  • OTRS_INSTALL=restore Will restore the backup specified by OTRS_BACKUP_DATE environment variable.
  • OTRS_BACKUP_DATE is the backup name to restore. It can have two values:
    • Uncompressed backup: A directory with its name in the same date_time format that the OTRS backup script uses.
    • Compressed backup file: A gzip tarball of the previously described directory with the backup files. These tarballs are created by this container when doing a backup.
For example setting OTRS_BACKUP_DATE=2018-12-15_00-30 will look for that directory inside /var/otrs/backups/, and restore the backup files inside it. Or you could set OTRS_BACKUP_DATE=otrs-2018-12-15_00_30-fulbackup.tar.gz and the script will look for that file in the same directory and restore it.
A backup file created with this image or with any OTRS installation will work (the backup script creates the directory with that name). This is useful when migrating from another OTRS install to this container. I know that some of the variable names are a little confusing, probably will be renamed at a later version.

Monday, May 7, 2018

Doing major version upgrades of OTRS docker containers

One missing feature of my OTRS docker containers was automating a major version upgrade without any manual configuration. It should be as easy to do as it is launching it. Minor versions upgrades are easy: just pull the new image and restart your containers. 

For example, if you are running OTRS 6.0.1 and want to upgrade to the latest version (6.0.7 ATM):
sudo docker-compose -f docker-compose-prod.yml pull
sudo docker-compose -f docker-compose-prod.yml stop
sudo docker-compose -f docker-compose-prod.yml rm -f -v
sudo docker-compose -f docker-compose-prod.yml up   
That's it. Minor version upgrades only involve security and bug fixes, so there are no database schema or module upgrades needed, the new image contains the latest OTRS software packages with the latest fixes.

Major version upgrades need much more work done, as mentioned before, additional to updating the software components there are others components that need updating too:
  • Database schema
  • Cronjobs
  • Configuration rebuild
  • Cache delete
So I have added a new major version upgrade feature controlled by the environment variable OTRS_UPGRADE=yes. When this variable is set in the docker-compose file, the major version upgrade process will be started.  Also modify your docker-compose file and make sure that the OTRS docker image has the latest tag (juanluisbaptiste/otrs:latest) on both the otrs and its data container. 

Then like with the minor version upgrade, pull the new OTRS image and restart your containers:
sudo docker-compose -f docker-compose-prod.yml pull
sudo docker-compose -f docker-compose-prod.yml stop
sudo docker-compose -f docker-compose-prod.yml rm -f -v
sudo docker-compose -f docker-compose-prod.yml up   
The upgrade procedure will pause the OTRS container boot process for 10 seconds to give the user the chance to cancel the upgrade. 

The first thing done by the upgrade process is to do a backup of the current version before starting. The backup will be stored on /backups (don't forget to map that directory to one in your host so you can access it).

Then it will follow the official upgrade instructions: 
  • Run database upgrade scripts
  • Upgrade cronjobs
  • Upgrade modules 
  • Fix file permissions 
  • Rebuild OTRS configuration and delete cache.
The software components were updated when pulling the new  mage. Also, there was no need to stop/start services as the upgrade occurs on container bootup, which means no services are started yet. Also remember to remove the OTRS_UPGRADE variable from the docker-compose file afterwards.

You could use this container to upgrade from non docker installations too, btw.

Note:
This feature was added to both OTRS 5 & 6 images, so upgrades from OTRS 4 can be preformed too.


WARNING: this feature is experimental and is still in heavy testing, use at your own risk !!

Wednesday, May 2, 2018

Ansible installation role for BigBlueButton



I was looking for an ansible role to install BigBlueButton with SSL support, but it seems there's not much roles out there for this. Searching I the Internet the most complete one I found was this one, but it was outdated (last commit from two years ago) and broken, and the PR to fix it was from almost a year ago with no answer from the developer, so I figured it was abandoned and forked it.

Additional to fixing the broken stuff, this fork has the following additional features:
  • Installs latest BigBlueButton stable version, currently 1.1, but it will be updated to 2.0 when it comes out of beta.
  • Installation behind a firewall (NAT setup support).
  • Automatic SSL configuration using LetsEncrypt certificates.
  • Optionally installs the bbb-demo and bbb-check packages.

Lets see an example playbook to do a BigBlueButton install with SSL support:
---
- hosts: bbb
  remote_user: ansible
  become: True
  become_user: root
  gather_facts: True
  roles:
    - role: ansible-bigbluebutton
      bbb_server_name: bbb.example.com
      bbb_configure_ssl: True
      bbb_ssl_email: foo@bar.com
Replace bbb_server_name with your server's hostname and bbb_ssl_email with your email address for the LetsEncrypt certificate generation, that's it. 

The role will install BigBlueButton according to the official installation instructions, generate SSL certificates using LetsEncrypt, and configure BigBlueButton to use those certificates. Remember, your hostname has to resolve to a public IP address, if not then LetsEncrypt certificate generation will not work.

If your server is behind a firewall the variable bbb_configure_nat: True needs to be added to the playbook to enable NAT configuration:
---
- hosts: bbb
  remote_user: ansible
  become: True
  become_user: root
  gather_facts: True
  roles:
    - role: ansible-bigbluebutton
      bbb_server_name: bbb.example.com
      bbb_configure_ssl: True
      bbb_ssl_email: foo@bar.com
      bbb_configure_nat: True
This will reconfigure BigBlueButton components to use the local IP address instead of the one the server publicly resolves to. 

If you want to install the demo package or the health check package you can use bbb_install_demo: True and bbb_install_check: True respectevly to install them.

There is still some missing stuff I want to do before I consider this role complete:
  • Push it to Ansible Galaxy.
  • Install the new greenlight interface to create meetings.
  • Install the new HTML5 client for testing.

As an alternative to greenlight there's another project called Mconf-web, which is a web portal from were you can create public and private rooms that have their own videoconference room in the BigBlueButton server. Check my mconf-web docker container for an easy way to use it.

Tuesday, February 13, 2018

OTRS 6 Help Desk System on docker

At the end of last year, OTRS 6 was released, it has some cool new features like the revamped admin interface, the new SysConfig , or the message transmission status. You should check out the complete new features list if you want to know more.

I have been working on and testing the OTRS 6 update to my unofficial OTRS docker images for the past month, and everything seems to be working fine with the new OTRS version.

The first thing done was to update the container base image to CentOS 7. I had avoided this update in the past because I have had some issues with the apache server from CentOS 7. I remember there was a bug that prevented the httpd process from starting, and also some of the reconfiguration that the container startup script does to the apache server needed to be rewritten, so I opted to wait until version 6 was released (as I expected to be the minimum supported CentOS version).

Now external databases can be used by setting the following environment variables:
  • OTRS_DB_NAME
  • OTRS_DB_USER
  • OTRS_DB_HOST 
  • OTRS_DB_PORT
I also worked on the logging output and changed colors to use the same ones from the OTRS logo. Speaking of logos, I added a new ascii logo to the container bootup process to make it look more professional :-)


The docker-compose file format was updated to version 3 (about time), but I left the old v1 on the repo if needed. Also there's a new CHANGELOG file, tracking most significant changes back to the first OTRS 5 image (check it out for a more detailed feature/bugfixing list).

From now it's not possible anymore to set some configuration options using environment variables, like OTRS_POSTMASTER_FETCH_TIME because it's not possible anymore to set the postmaster's fetch time from command line as it was possible until OTRS 5. Others variables were removed because after being set on Config.pm vía env variables, they could not be changed later using SysConfig, so the ones that could be edited at a later time were removed, like OTRS_ADMIN_EMAIL, OTRS_ORGANIZATION and OTRS_SYSTEM_ID (actually, these last ones were removed at some point during 5.0.x images, check the CHANGELOG for the exact version).

Another feature added during 5.0.x development was the auto module reinstallation at container bootup after version upgrade. So, if you had some additional modules installed and you upgraded your OTRS image to the latest version, they will be re-downloaded and reinstalled when the upgraded container starts so your installation does't break.

Lastly, there's another new environment variable to enable container debugging: OTRS_DEBUG. This debugging is not very complex, it just enables bash debugging and installs some programs like telnet and dig to aid on troubleshooting.

I have been testing it on one of our installations and it's working very well, you should give it a try too !