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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
Old 04-04-2020
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.
 

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KEEPALIVED(8)						      System Manager's Manual						     KEEPALIVED(8)

NAME
keepalived - load-balancing and high-availability service SYNOPSIS
keepalived [-f|--use-file=FILE] [-P|--vrrp] [-C|--check] [-l|--log-console] [-D|--log-detail] [-S|--log-facility={0-7}] [-V|--dont-release-vrrp] [-I|--dont-release-ipvs] [-R|--dont-respawn] [-n|--dont-fork] [-d|--dump-conf] [-p|--pid=FILE] [-r|--vrrp_pid=FILE] [-c|--checkers_pid=FILE] [-v|--version] [-h|--help] DESCRIPTION
Keepalived provides simple and robust facilities for load-balancing and high-availability. The load-balancing framework relies on well-known and widely used Linux Virtual Server (IPVS) kernel module providing Layer4 load-balancing. Keepalived implements a set of checkers to dynamically and adaptively maintain and manage load-balanced server pool according their health. Keepalived also implements the VRRPv2 protocol to achieve high-availability with director failover. OPTIONS
-f, --use-file=FILE Use the specified configuration file. The default configuration file is "/etc/keepalived/keepalived.conf". -P, --vrrp Only run the VRRP subsystem. This is useful for configurations that do not use IPVS load balancer. -C, --check Only run the healthcheck subsystem. This is useful for configurations that use the IPVS load balancer with a single director with no failover. -l, --log-console Log messages to the local console. The default behavior is to log messages to syslog. -D, --log-detail Detailed log messages. -S, --log-facility=[0-7] Set syslog facility to LOG_LOCAL[0-7]. The default syslog facility is LOG_DAEMON. -V, --dont-release-vrrp Don't remove VRRP VIPs and VROUTEs on daemon stop. The default behavior is to remove all VIPs and VROUTEs when keepalived exits -I, --dont-release-ipvs Don't remove IPVS topology on daemon stop. The default behavior it to remove all entries from the IPVS virtual server table on when keepalived exits. -R, --dont-respawn Don't respawn child processes. The default behavior is to restart the VRRP and checker processes if either process exits. -n, --dont-fork Don't fork the daemon process. This option will cause keepalived to run in the foreground. -d, --dump-conf Dump the configuration data. -p, --pid=FILE Use specified pidfile for parent keepalived process. The default pidfile for keepalived is "/var/run/keepalived.pid". -r, --vrrp_pid=FILE Use specified pidfile for VRRP child process. The default pidfile for the VRRP child process is "/var/run/keepalived_vrrp.pid". -c, --checkers_pid=FILE Use specified pidfile for checkers child process. The default pidfile for the checker child process is "/var/run/keepalived_checkers.pid". -v, --version Display the version and exit. -h, --help Display this help message and exit. SEE ALSO
keepalived.conf(5), ipvsadm(8) AUTHOR
This man page was written by Ryan O'Hara <rohara@redhat.com> November 2012 KEEPALIVED(8)
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