Installing A Web, Email & MySQL Database Cluster On Debian 6.0 With ISPConfig 3 - Page 5

5 Configure Replication In ISPConfig

Log into ISPConfig on the master server with a webbrowser:

http://192.168.0.105:8080

Click on System > Server Services > server2.example.tld:

Select "server1.example.tld" in the "is mirror of" field and click on Save.

Then open System > Server Config and enable the checkbox "Connect Linux userid to webid" on the "Web" tab:

 

6 Additional Notes

When you want to activate a firewall on the master or slave server, ensure that you open port 3306 for MySQL on both servers.

 

7 Links

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From: at: 2012-02-19 10:57:56

I can't get the MySQL sync to work.
After scp command and MySQL config edit it fails start on server2. Is there something missing from this tutorial?

From: at: 2012-03-01 09:47:28

The tutorial is complete and works on the servers that I installed. If you need help with your setup, please make a post in the forum which includes the detailed error messages etc.

From: poisen at: 2012-04-12 19:09:30

...I have the same problem with the mysql sync, after stopping mysql service and editing /etc/mysql/my.cnf there is no way to restart MySQL again.

 Starting MySQL database server: mysqld . . . . . . . . . . . . . . failed!

From: HansB at: 2012-06-09 15:50:23

Works like a charm with older Mysql.

Trying to do it with Mysql5.5+ (from dotnet) and I get the same error as above.

The following options are removed in MySQL 5.5. If you attempt to
start mysqld with any of these options in MySQL 5.5, the server aborts
with an unknown variable error.


–master-host

–master-user

–master-password

–master-port

What way to work around?

From: at: 2012-10-18 05:16:27

I know this works cause I have followed it in the past but I now notice something that is incorrect. 

 Where you have the command: ssh-copy-id -i $HOME/.ssh/id_dsa.pub root@192.168.0.106

Right below that section in the next block is code you obviously copied out of your xterm window.

 All the IP's are different, not hugely so but for anyone walking through this the first time and clueless about what they are doing and what is really going on and just following verbatim.  Small problem I thought you might care to know about and possibly address. I had to verify if I was reading your How-To or notes of my own in one of my wiki's and I don't think it was there before but hard to say, worked for me each time none the less.

hths 

From: Anonymous at: 2012-11-09 09:56:39

I'm having big-time trouble with Slave_IO_Running: No
Why is this happening? The Slave_SQL_Running is Yes....
Help cause I'm stuck

From: Anonymous at: 2012-11-20 22:19:54

On server 2:


Log into the MySQL shell as root user..

You should use : 

/etc/init.d/mysql start (again)

Then you have an error like that:

 

ERROR 29 (HY000): File '/var/lib/mysql/master.info' not found (Errcode: 13 or similar. You should use chmod 777 /var/lib/mysql/master.info .

Then the error dissapear. If you are more serious , you should give the correct priveligies to mysql.

 

From: at: 2013-03-20 23:00:05

Hi guys


im new to this , is there a setup like this that works with ubuntu 12.04 lts.


i will be thankfull for life.


 

From: Anon at: 2013-09-22 12:04:58

I had problems following this set of instructions organising the base setup and MYSQL config. As I see it it only sets up replication one way. 

 I followed the following instructions to setup master-master and then carried on : 

 http://www.howtoforge.com/mysql5_master_master_replication_debian_etch

From: at: 2012-06-06 19:29:50

  • Create a user calle unison on server2
  • Make a private key on server1 and add it to the authorized list for unison on server2

 

On server2:

  • Add unison to the sudoers with `unison ALL = NOPASSWD: /usr/bin/unison-wrap`
  • mv /usr/bin/unison /usr/bin/unison-wrap
  • vi /usr/bin/unison

#!/bin/bash
/usr/bin/sudo /usr/bin/unison-wrap $*

  • chmod +x /usr/bin/unison

What happens now is that the user unison has no rights really but can get full root rights BUT ONLY FOR unison. Ofcouse you could potentially use unison to inject the full system. But unison itself account has no password and the private key is on server1. So as long as that private key is not been compromised you should be golden.

If some one want i can write a full tutorial on setting up unison like this.

From: ColdDoT at: 2012-06-05 19:29:24

Good info
Only thing i find insecure is that you use root accounts for sync...
perhaps make a different user for that?

From: Anonymous at: 2012-12-02 15:19:21

thank you for this tutorial, it would be very nice when it works but after 6 tries with fresh installation of slave i give it up,

i think it is not working when the master server still is running  (3.0.4.6)

the SHOW SLAVE STATUS \G gives error, which can be solved with

replicate-ignore-table=dbispconfig.sys_datalog
replicate-ignore-table=dbispconfig.monitor_data 

in /etc/mysql/my.cnf

but after all, i see no choice in the "server is mirror of" LIST  in ispconfig

the databases on the slaves are all without any tables

the mirroring of www and vmail with unison, dont work

i tried very hard and concentrated and 1:1 like in this tutorial but now i am frustrated and give up

From: Anonymous at: 2013-01-09 15:43:59

ISPConfig create a new system user for new client. The new user, is used to applied permission to access publish directory.

How I can sync the files (/etc/passwd, /etc/group and /etc/shadow)?

 Will I use rsync or unison to this...

From: at: 2014-02-11 22:52:34

Just a quick comment on using crontab to launch unison, we are using it to sync emails between servers and started with a large var/vmail folder (20GB). During the initial sync unison was launched numerous times as a cron job and I believe each instance tried to sync the whole var/vmail folder structure which caused everything to grind to a halt and was eventually fixed by a reboot.
 
Anyway to avoid multiple instances of unison running again in the future I simply wrote the following bash script to check if unison was running and if it was simply. I then called this script from crontab rather than unison directly. Hope it helps someone.
 
if [ "$(pidof unison)" ]
then
echo "Unison Already Running"
else
echo "Launching Unison"
/usr/bin/unison
echo "Unison Finished"
fi

From: Richard Ablewhite at: 2014-06-04 02:53:49


On page 3 the guide adds unison into cron to run every 5 minutes. 




This is potentially dangerous as if the task takes more than 5 mins to complete then multiple copies of unison run simultaneously and will consume large amounts of bandwidth and memory. This is particularly dangerous as unison will then run multiple instances on both cluster nodes, I've seen this bring down clusters.




A quick fix is to add the following to cron instead, ensuring unison does start if the process is already running:




*/5 * * * * pgrep unison || unison


From: Giulio PR at: 2014-06-14 01:46:49

 I think so.


Also as I'm mostly interested in apache2, what about /etc/apache2? What's the point in having the mysql synched if the slave server doesn't know anything about the newly created site?

From: admin at: 2014-06-14 19:30:50

Thats all synced by ispconfig automatically.

From: admin at: 2014-06-14 19:32:26

Everything related to the Website, database, mailuser and other configuration is synced by ispconfig automatically. No Need to install any other Software then the sftware described in the guide to get a fully replicated cluster.

From: Benjamin at: 2013-05-17 15:06:12

I don't understand the last step.

For which reason we would use it ?

The SCP command copy the config of master to slave, in order to slave server use the database of master... but what is the advantage, because databases of both server will be synchronized.

And when the master server will failed, its database will not be able to used by slave server... that's not a problem ? 

I have used the port 8080 for both servers, I hope I can use my servers without that..

 Thank you for response..

 Benjamin

From: at: 2013-08-11 13:31:17

in the file you can read: $conf['db_host'] = 'localhost'; so even if you copy the file, each ispconfig server will connect to it's own database. if you don't use the same database, you'll always have 2 different setup. at this point, I think the dbispconfig2 databases become useless and could be deleted

From: Anonymous at: 2012-02-18 19:03:48

Easy to understand written toutorial - but I miss some points you mentioned in the introduction:

 

This tutorial describes the installation of a clustered web, email, database and DNS server to be used for redundancyhigh availability and load balancing on Debian 6 with the ISPConfig 3...

 

What I miss are postfix (queue) redundancy, amavis (temp + quarantine)redundancy as well as handling logfiles (if complete logfiles to be archived for some month -> Vorratsdatenspeicherung). Just copying /vmail from server 1 to server 2 isn't redundancy, the loss of mails is possible.

How to switch between services (or servers) if one goes down or isn't reachable and how is load balancing solved?

just my 2 cents
Alois

From: at: 2012-03-16 18:57:48

 Hello, What user and password i need to ISPConfig control panel login ?

From: at: 2012-03-27 06:06:43

The default ISPConfig login is:

Username: admin
Password: admin

From: at: 2012-04-12 08:06:47

How IspConfig 3 manage the load balancing apache clusters sessions?

From: qqkk at: 2012-04-29 15:15:17

Then open System > Server Config and enable the checkbox "Connect Linux userid to webid" on the "Web" tab:

this config for server1 or server2??

From: Shelby99 at: 2012-05-11 15:49:13


Hi


I can't login on default admin admin account. Every time i try on both servers i get this error:


ERROR

Username or Password wrong.1

Password lost?
 

 Anybody know what to do?


From: Anonymous at: 2012-06-19 13:28:14

Hello! First of thank your very much for this nice tut. I also solved the problem regarding to the login problem for the ISPconfig web interface. 

Only one thing I left: The configuration at the end "Connect Linux userid to webid". Do I have to set this configuration for both servers?

 Thank you, mic.

From: at: 2012-06-27 10:48:47

I've done on both servers and works correctly

From: Ariel at: 2012-10-18 17:25:01

Same incident here.

 I've used these queries to the DB:

 mysql> select username, passwort, md5('admin')  from sys_user\G

*************************** 1. row ***************************

    username: admin

    passwort: 21232f297a57a5a743894a0e4a801fc3

md5('admin'): 21232f297a57a5a743894a0e4a801fc3

1 row in set (0.00 sec)

So, the password for 'admin' user is 'admin' but the interface does not allow me to log on.

From: at: 2012-11-01 03:19:23

Get the password again:

Code:
grep -i db_password /usr/local/ispconfig/interface/lib/config.inc.php
Set the password:
Code:
mysql -u root -p
mysql> update mysql.user set password=PASSWORD("<PASSWORD>") where User='ispconfig';
mysql> flush privileges;
mysql> quit

From: berry at: 2013-02-17 19:55:11

hello, thank you very much unbelievable

From: at: 2013-04-11 10:03:58

Same question: How IspConfig 3 manage the load balancing and HA?

From: nitesh at: 2014-08-28 14:03:08

Hello,


 I also read that tutorial and this is too good. But i just want to ask if my master server goes down then how can  i run services on server 2 so my webistes will not go down.


 Please update on this.