71.4. csync2 - cluster synchronization tool

71.4.1. server

过程 71.3. Install and setup csync2 on Ubuntu

1. installation

   $ sudo apt-get install csync2 sqlite3 openssl xinetd

   The following line will be added to your /etc/inetd.conf file:

   $ cat /etc/inetd.conf
   csync2          stream  tcp     nowait  root    /usr/sbin/csync2        csync2 -i

   If you are indeed using xinetd, you will have to convert the above into /etc/xinetd.conf format, and add it manually.

   service csync2
   {
   	disable = no
   	protocol = tcp
   	socket_type = stream
   	wait = no
   	user = root
   	server = /usr/sbin/csync2
   	server_args = -i
   }

   /etc/services

   $ cat /etc/services |grep csync2
   csync2          30865/tcp                       # cluster synchronization tool

2. create a self-signed SSL certificate for csync2

   sudo openssl genrsa -out /etc/csync2_ssl_key.pem 1024
   sudo openssl req -new -key /etc/csync2_ssl_key.pem -out /etc/csync2_ssl_cert.csr
   sudo openssl x509 -req -days 600 -in /etc/csync2_ssl_cert.csr -signkey /etc/csync2_ssl_key.pem -out /etc/csync2_ssl_cert.pem

   $ sudo csync2 -k /etc/csync2_ssl_cert.key

3. After having done everything, we are now going to configure Csync2 so that we can determine which files are going to be synchronized.

   For this example, we are going to synchronize /etc/apache2 and /etc/mysql. For that we open /etc/csync2.cfg and we configure it like this:

   $ sudo vim /etc/csync2.cfg
   # please see the REAMDE file how to configure csync2
   
   group testing #group name, we can have multiple groups
   {
       host master; #master server
       host (slave); #slave server
       #host (node1);
   
       key /etc/csync2_ssl_cert.key;
   
       include /etc/apache2/;
       include /home/neo;
   
       backup-directory /var/backups/csync2;
       backup-generations 3;
       auto none; #no automatic sync
   }

4. hosts

   $ sudo vim /etc/hosts			
   192.168.245.131 slave

5. restart

   $ sudo /etc/init.d/xinetd restart

71.4.2. node

过程 71.4. node

1. login to slave node

   neo@slave:~$ sudo vim /etc/hosts			
   192.168.245.129 master

2. install

   $ sudo apt-get install csync2 xinetd

3. copy config file from master

   neo@slave:~$  sudo scp root@master:/etc/csync2* /etc/

4. restart

   neo@slave:~$ sudo /etc/init.d/xinetd restart

71.4.3. test

过程 71.5. testing

1. master

   neo@master:/etc/apache2$ sudo touch test.master
   neo@master:/etc/apache2$ sudo csync2 -x

2. node

   neo@slave:/etc/apache2$ ls test.master -l
   -rw-r--r-- 1 root root 0 2008-10-31 06:37 test.master

71.4.4. Advanced Configuration

例 71.7. /etc/csync2.cfg

$ sudo cat /etc/csync2.cfg

# please see the REAMDE file how to configure csync2
# group name, we can have multiple groups

group www {
    host master;
    host (slave);

    key /etc/csync2_ssl_cert.key;

    include /etc/apache2/;
    include /etc/csync2.cfg;
    include /var/www;
    include %homedir%/neo;
    exclude %homedir%/neo/temp;
    exclude *~ .*;

action
{
        pattern /etc/apache2/httpd.conf;
        pattern /etc/apache2/sites-available/*;
        exec "/usr/sbin/apache2ctl graceful";
        logfile "/var/log/csync2_action.log";
        do-local;
}

    backup-directory /var/backups/csync2;
    backup-generations 3;
    auto none;
}

prefix homedir
{
        on *: /home;
}

71.4.5. 编译安装

过程 71.6. 

• # yum install byacc -y

  # tar zxvf librsync-0.9.7.tar.gz
  # cd librsync-0.9.7
  ./configure --prefix=/usr/local/librsync-0.9.7
  # make && make install

  # www.sqlite.org
  # wget http://www.sqlite.org/sqlite-3.7.2.tar.gz
  # tar zxvf sqlite-3.7.2.tar.gz

  # www.gnu.org/software/gnutls/
  # wget http://ftp.gnu.org/pub/gnu/gnutls/gnutls-2.10.1.tar.bz2
  # tar jxvf gnutls-2.10.1.tar.bz2

  # wget http://oss.linbit.com/csync2/csync2-1.34.tar.gz
  # tar csync2-1.34.tar.gz
  # ./configure --prefix=/usr/local/csync2-1.34 --with-librsync-source=/usr/local/src/librsync-0.9.7.tar.gz --with-libsqlite-source=/usr/local/src/sqlite-3.7.2.tar.gz --disable-gnutls

原文出处：Netkiller 系列 手札
本文作者：陈景峯
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