Ha mailserver, is possible active/active with "constant" connection? Post: 303045629

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Top Forums UNIX for Advanced & Expert Users Ha mailserver, is possible active/active with "constant" connection? Post 303045629 by Peasant on Saturday 4th of April 2020 02:10:25 PM

04-04-2020

Moderator

Why address on lo interface ?
Getting address on that interface is only used in case of DSR (direct server return) balancing, which haproxy does not do.
Haproxy is L3 and above, while DSR is L2.

Can you remove the lo:0 address entry from ALL servers (LB and mail servers) ?
In your case, VIP address is only on master haproxy node (one of two) with /24 mask (not on lo, and keepalived is handing that.

Also, configure the keepalived in the following manner, then retest :

Code:

vrrp_script check_haproxy {
script "/usr/bin/killall -0 haproxy" # be sure to check the availability of killall program or configure some other check, killall is cheap.
interval 2
weight 2
}
vrrp_instance VI_1 {
        state MASTER #
        interface <your network interface for VIP address>
        virtual_router_id 51
        priority 101
# VRRP VIP
virtual_ipaddress {
          10.2.0.4
}
authentication {
        auth_type PASS
        auth_pass <some password>
}

track_script {
        check_haproxy
}
}

Haproxy keeps monitoring accessibility of (mail) backend servers, and keepalived keeps monitoring if haproxy is up.
If that is what you need and i understood correctly.

Of course, you can add additional conditions to keepalived to execute failover of VIP address, after you confirm everything is working.

Hope that helps
Regards
Peasant.

Peasant

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LEARN ABOUT OPENDARWIN

smbutil

SMBUTIL(1)						    BSD General Commands Manual 						SMBUTIL(1)

NAME

     smbutil -- Interface to SMB requester

SYNOPSIS

     smbutil [-hv] command [-options] [args]

DESCRIPTION

     The smbutil command used to control SMB requester and issue various commands.

     There are two types of options - global and local to specified command.

     The global options are:

     -h      Print short help message.

     -v      Verbose output.

     The commands and local options are:

     crypt [password]
	     Slightly encrypt clear text password to use it in the ~/.nsmbrc file. The encrypted password starts with '$$1' symbols.  Warning: the
	     encryption function is very weak and intented only to hide clear text password.  If password is ommited from command line, program
	     will prompt for one.

     help command
	     Print usage information about command.

     lc      List active connections and their parameters.

     login [-connection options] //[workgroup;][user[password]@] server[/share]
	     Login/attach to the specified server and/or share as user.  This command will create and authenticate connection to an SMB server,
	     and will leave it active after exit.  Thus, one can login only once and then use other SMB commands without authentication procedure
	     and additional connections.  For the description of [-connection options] see mount_smbfs(8) command (all uppercase options are con-
	     nection options).

     logout //[workgroup;][user[password]@] server[/share]
	     Logout/detach from the specified server and/or share as user.  This command will destroy connection created by login command. A con-
	     nection may not be closed immediately if it used by other programs.

     lookup [-w host] name
	     Resolve given name to IP address.	NetBIOS name server can be directly specified via [-w] option.

     print [-connection options] //[workgroup;][user[password]@] server[/share] file
	     Send given file to the specified queue on the remote server.  If file is '-', then standard input will be used.

     status server
	     Resolve given server (IP address or DNS name) to NetBIOS workgroup and system name.

     view [-connection options] //[workgroup;][user[password]@] server
	     List resources avaliable on the specified server for the user user.

FILES

     ~/.nsmbrc	    keeps description for each connection.  See ./examples/dot.nsmbrc for details.

AUTHORS

     Boris Popov <bp@butya.kz>, <bp@freebsd.org>

BUGS

     Please report any bugs to Apple.

BSD
								   Feb 14, 2000 							       BSD