Zentyal

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Revision as of 18:47, 7 January 2016 by Apos (talk | contribs) (→‎Openchange)

Zentyal - the small business server for Linux

Installation and Upgrading to Ubuntu 14.04 LTS

Unfortunately Zentyal changed it's release policy DRAMATICALLY since Version 3.4 (3.5).

Nur die kommerziellen Versionen Zentyal folgen den Ubuntu-LTS Fahrplan und bieten entsprechende Migrationswege uND Werkzeuge an!


Be very carful on updating an existing Ubuntu 12.04 LTS Zentyal installation.

You will most probably loose a lot of important functionality!

Read carfully and check the new requirements at http://www.zentyal.org/zentyal-release-policy

It in fact boils down that you loose on update:

  • Zarafa module (!) - and thereby your mail configuration an installation which ist WORST!
  • Webserver configuration module - you have to manage it manually. This is not very dramatic.
  • Be aware and prepared of apache2.4 versus apache 2.2 config changes (which mainly you can read about in Webserver#Apache_2.4).
  • Radius - which in my case is crucial, since almost any service relys on this for authentification!


New is:

  • Openchange support - which is very PROMISING
  • You'll get an Rolling Release - that means updating Zentyal almost ever need updating the server to a new Ubuntu version which could probably lead to strange side effects for other mission critical systems (database server, programming language environments like ruby) ...


A personal comment on this

As far as I can say, the new release policy of Zentyal is very annoying on the first place. I cost me almost a week to recover a system, when updating a 12.04 server, which in case lead to an update on Ubuntu 13.04 which was not intended!

But, after doing a lot of updates on my zentyal installations and reading about the facts, I can agree with the decission of Zentyal going this way. They are getting rid of parts, which can be dealed easily whith native system tools. They focus on networking (firewall), gateway, office and open change as an exchange server replacement. I think, this is a good way - however no easy way for users of the commiunity version of zentyal.

Troubleshooting when uninstalling or reinstalling an old zentyal installation

Prerequesites:

  1. Check if the zentyal database is installed correctly
  2. ALWAYS only install one module per time, configure it correctly and then head on!
  3. Backup your zentyal settings

Possible use cases:

1. Database' was accidentilly dropped and zentyal-core could not be uninstalled / installed with the postinstallation script (also see section 3.). So create an empty one ;-) 

mysql> create database zentyal;

If you need a new zentyal database, then set the root mysql password: 

vim /var/lib/zentyal/conf/zentyal-mysql.passwd

and install a new db: 

/usr/share/zentyal/create-db

then restart mysql 

service mysql restart

2. See - if you installed zentyal - that no process is running using ebox: 

> ps x | grep ebox
22871 ?        Ss     0:00 sudo -u ebox /usr/bin/redis-server /var/lib/zentyal/conf/redis.conf

3. A postinstallation script of a zentyal package, e.g. zentyal-core is not working, so teh package zentyal-core cannot be conigured or installed:

  • Solution: Edit the script standalone and add an set -x, then check for the error messages!
vim /var/lib/dpkg/info/zentyal-core.postinst
#!/bin/bash
set -x

set -e
[...]
  • It might be necessary to deactivate the script:
vim /var/lib/dpkg/info/zentyal-core.postinst

#!/bin/bash
exit 0

set -e
[...]
  • re-run dpkg:
dpkg --configure -a
  • continue with the web interface, which should be run now!
service zentyal webadmin restart

Base installation on ubuntu 12.04 LTS

We are startigng with a bare ubuntu system with only ssh enabled.

First of all please update all packages and do some configurations: 

vim /etc/apt/sources.list

Uncomment the following line: 

deb http://archive.canonical.com/ubuntu precise partner

We install the apt-add-repository-script to be able to use the zentyal repository afterwards and do a full system upgrade: 

apt-get install -y python-software-properties
apt-add-repository ppa:zentyal/3.2 # PUT THE ACTUAL VERSION NUMBER HERE!
apt-get update
apt-get dist-upgrade
apt-get clean

Then add an administrative account for zentyal.

To be able to access the webinterface you have setup an administrativ user which belongs to the admin group. This is NOT the ubuntu adm group! You have to create the group first: 

groupadd admin
useradd myAdmin
passwd myAdmin
usermod -G admin -a myAdmin
...

Pleas verify, that the newly created user is part of the new group with: 

su my Admin
groups

Finally reboot the system: 

reboot

Install Zentyal

The base system then will be install via the command 

apt-get -y install zentyal

This will install all prerequisites. Please prepare to have:

  • the or a mysql root password
  • the port for the webinterface

I suggest 444 for the webinterface, so it would not be in conflict with https-pages on your site (you can then access the webinterface via http://vserver:444).

Configure the services

You will now be able to access the webinterface via http://vserver:444.

There choose the services you like. It is always good, of possible to to a snapshot after each of this steps and test, if everything went ok!


Secure the Webinterface with an ssh tunnel

This solution is handy if you are not able to use VPN (e.g. because of a single network card and a kvm virtual guest and no access to the host system).

The SSH server should be - for security reasons - configured to use certificate authenitfication only, which is in fact almost the same then a VPN connection (sshd_config: PasswordAuthentication no, UsePAM no). Fail2ban is also a good idea!

On a local console do: 

autossh -L 9000:IP_OF_SERVER:8443 loginname@IP_OF_SERVER
# autossh keeps the tunnel open, if you are on a week,
# often disconnectiong TCP/IP
# apt-get install autossh

where

  • 8443 is the port of the zentyal web interface
  • 9000 is the local port you can access the web interface in your browser

Now you can access the Zentyal Webinterface in your local browser with: 

https://localhost:9000

Firewall

IMPORTANT: Alter your firewall settings to enable the Zentyal administration !!!

Otherwise you won't be able to access the webinterface.

In case you forget this you can temporaryly disable the firewall via commandline and alter this settings. 

/etc/init.d/zentyal firewall stop

Using hooks

When the firewall module of Zentyal is restarted, all iptable-rules (see NAT) will be reset. So it is wise to use the zentyal hook system to reset the desired rules! A detailed explanation you'll find here: Zentyal#Customization

LDAP port changed on Zentyal 3.2

By default LDAP uses the port 389. The problem is, that samba4 - which is part of Zentyal 3.2 - already uses this port.

For that reason LDAP on Zentyal 3.x is running on port 390. This is not documented on the first sight, and in the firewall, the "LDAP" is assigned to prot 389.

Solution:

  1. add a custom port 390 and name it e.g. LDAP-Zentyal
  2. open the port in the firewall for the internal network traffice (or outside, which is NOT wise)

Test with. Replace <ZENTYAL-SERVER-IP> with the IP of your LDAP-server 

ldapsearch -x -p 390 -LLL -h <ZENTYAL-SERVER-IP> -b "" -s base "(objectclass=*)" supportedSASLMechanisms

Radius

#/bin/bash
#
# Put this in /etc/rc.local
#
# Monitor zentyal radius 

# Upon update, links for freeradius will be set again, so remove them
update-rc.d -f freeradius remove 

restart_radius() {
     /usr/sbin/service zentyal radius stop
     sleep 2
     /usr/bin/killall freeradius
          
     /usr/sbin/service zentyal radius start
} 

while (true)
do
       if radtest radtestuser 123-qwe localhost 1812 123-qwe
       then
               echo "RADIUS OK"
 
       else
               logger "ERROR: ZENTYAL RADIUS is DOWN ... restarting ..."
               restart_radius
       fi
 
       sleep 15
 
done

LDAP

[Update] --Apos (talk) 11:06, 2 November 2013 (CET)

Redmine

This is tested with Zentyal 3.2 on Ubuntu 12.04 LTS and Redmine 2.3.3-2 (via ppa). ! Be aware and read the section LDAP port changed on Zentyal 3.2 !

On the users and group-page in the zentyal administration page there are the credentials you need to get readonly access to LDAP.

  • LDAP Settings

  • Zentyal LDAP credentials

LDAP credentials in zentyal: 

Basedomain (Base DN): dc=your_domain,dc=your_tld
Rootdomain (Root DN): 	cn=zentyal,dc=your_domain,dc=your_tld
Password: 	        <admin_secret_pass>
Read-only root DN: 	cn=zentyalro,dc=your_domain,dc=your_tld
Read-only password: <ro_secret_pass>
Default Users DN: 	ou=Users,dc=your_domain,dc=your_tld
Default Groups DN: 	ou=Groups,dc=your_domain,dc=your_tld

For testing, if you have the right credential, you can use e.g. the free and opensource JXplorer or the commandline:

Check if, the server accepts incoming port 

telnet <IP_OF_LDAP_SERVER> 390



ldapsearch -x -p 390 -b "<Basedomain (Base DN)>" -h <IP_OF_LDAP_SERVER> \
-D "<Read-only root DN>" -w "<Read-only password>"

Figured that out, you can e.g. use LDAP in Redmine like this:

  • Redmine LDAP settings

Owncloud

See Owncloud#Owncloud.2C_LDAP_and_Zentyal.

Network

Zentyal completely cares for the network on your ubuntu server.

Therefore you should - but do not have to - disable the network-manager: 

sudo service network-manager stop

Create an override file for the upstart job: 

echo "manual" | sudo tee /etc/init/network-manager.override

Then configure your network cards with zentyal and be sure to enable the WAN switch, if you are using zentyal on an internetserver without a gateway in front of it, that is, if your server ip is an internet ip address:

20131006 Zentyal Network 1.png

VPN

A good guide:

On a kvm based vserver (netcup.de) check, if the following configurations are enabled:

Enable ip_forward: 

echo "1" > /proc/sys/net/ipv4/ip_forward

Forward tap0: 

iptables -A FORWARD -i eth0 -o tap0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i tun0 -o eth0 -j ACCEPT

or tun0, if you are using tun: 

iptables -A FORWARD -i eth0 -o tap0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i tap0 -o eth0 -j ACCEPT

BUT: this won't work in a virtual guest (vserver) due to NAT:

Mail

First of all we like to install an e-mail-system. This is what most users want, when they install zentyal on an vserver.

If you only choose the mail plugin, several plugins will be installed, too:

Zentyal mail 1.png

In the next steps, it is important that you

  1. choose eth0 as interface (see picture) and later
  2. DHCP for the configuration of eth0.
  3. Directly afterwards you will be asked for the Kerberos REALM. Please use the domain name of your server, if configured. If not SKIP this step for now!

Zeentyal Mail 2.png

Virtualisation module moved

Like advised here ...

... some of the modules - especially the virtualisation module - have moved to a so called contribution section.

[...]
Moreover, as announced in the Forum, the following modules have been moved to the contrib repositories in order to live
up to our motto of being an easy-to-use Linux small business server:
* PPTP
* Virtualization
* Thin clients
* VoIP
[...]

A solution can be found here:

Customization

A Zentyal system can be adopted to your own needs in a very easy way: using hooks!

Every service on a Linux system is configured in its own configuration file. Mostly living in /etc/.... Zentyal stores the setting of all services in so called "stubs". These templates can be overridden using hooks.

But using hooks make the system more complex. This means: when doing updates of your zentyal system, you have to be careful and integrate actual changes of zentyal's stub into your own hook. Your own hooks are not updated automatically as well.

How this is done:

Also see the section Zentyal#Firewall.

Samba4 - changing the REALM

Sometimes it can be necessary to alter the realm (kerberos). This will brake all user related modules and forces them to reinstall: 

/usr/share/zentyal-users/reinstall
  1. Then klick on the "Ally"-Button on the upper right corner of the web-interface.
  2. Then go to "Users" -> "Mode...", change the realm and apply.
  3. Then you have to reenable the "Users"-module and apply the changes.
  4. Then you can also reenable the "Samba"-module and apply the changes.

see: http://trac.zentyal.org/ticket/5695

Openchange

Reprovisioning fails

In my case it helped to alter the call of the provisioning call and add "--ignore-already-exists" into the line: 

vim  /usr/share/perl5/EBox/OpenChange/Model/Provision.pm +457

try {  
  my $cmd = "openchange_provision --ignore-already-exists --firstorg='$organizationName' ";

Active sync

Read carefully the section about Active sync ...

... and you will see you have to install manually ... 

sudo apt-get install sogo-activesync

... to get the choice on the Openchange site.

Monitoring Services

Apache

With e.g. monit: see Server_Monitoring#Zentyal_Apache2.

Radius

There seems to be a problem with freeradius and Zentyal 3.4. 

update-alternatives -f freeradius remove

vim ~/bin/monitor_zentyal_radius



# !/bin/bash

# Monitor radius

restart_radius() {
      /usr/sbin/service zentyal radius stop
      sleep 2
      /usr/bin/killall freeradius
           
      /usr/sbin/service zentyal radius start
}
 
while (true)
do
       if radtest radtestuser 123-qwe localhost 1812 123-qwe
       then
               echo "RADIUS OK"
 
       else
               logger "ERROR: ZENTYAL RADIUS is DOWN ... restarting ..."
               restart_radius
       fi
 
       sleep 15
 
done
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