I've set up a HA solution with redundant Samba Domain Controllers throuth the "Heartbeat" package at:
http://www.ultramonkey.org/download/heartbeat/1.1.3/redhat_9/
I have two "Redhat 9" Linux machines (A and B) configured as a HA cluster providing httpd, DNS, and Samba Domain and File services on a virtual IP of 192.168.0.45. Initially one of the machines, (A), is running those services (smb, named and httpd) and listening on the virtual IP, while the other, (B), watches a heartbeat from machine (A) through both a redundant ethernet and serial link. When both heartbeat lines are pulled or the power drops on machine (A), within 10 seconds machine (B) starts the httpd, dns and smbd/nmbd services and listens on the virtual IP.
I have a third machine (C) running Win2000 as a client for those services. I can even login on the windows box, thus using Samba's Domain Authentication services from machine (A), and while logged on the domain, kill machine (A) and machine (B) takes over and when I log off the windows box my remote profile is saved on machine (B), no muss no fuss, all transparent to the client machine. The win2000 client can surf to the web services on the virtual IP and never know that a machine has died. When machine (A) comes back up it takes back over the services automatically.
What this means is that a machine outage does NOT take our customers Domain Authentication out. All the services will fail over to a redundant machine automatically. I know for Samba there are BDC capabilities but this solution seems to cover all the internet services we use at once. I hope someone will get somethnig usefull from this. Has anyone else tried this with Samba?
Here is a brief procedure (minus config files) for getting it working.
Installed "libnet" from the src rpm:
rpm -i libnet-1.1.0-1.rh.9.um.1.src.rpm cd /usr/src/redhat/SPECS rpmbuild -bb libnet.spec rpm -Uvh /usr/src/redhat/RPMS/i386/libnet-1.1.0-1.rh.9.um.1.i386.rpm
Installed heartbeat 1.1.3 from the src rpm:
rpm -i heartbeat-1.1.3-1.rh.9.src.rpm cd /usr/src/redhat/SPEC rpmbuild -bb heartbeat.spec
The heartbeat src RPM contains several packages to install:
rpm -Uvh /usr/src/redhat/RPMS/i386/heartbeat-pils-1.1.3-1.rh.9.i386.rpm rpm -Uvh /usr/src/redhat/RPMS/i386/heartbeat-stonith-1.1.3-1.rh.9.i386.rpm rpm -Uvh /usr/src/redhat/RPMS/i386/heartbeat-1.1.3-1.rh.9.i386.rpm
Configure NICS: (Virtual IP 192.168.0.45 is set in "haresources")
Machine A eth0 192.168.0.40 Machine A eth1 10.0.0.1 Machine B eth0 192.168.0.41 Machine B eth1 10.0.0.2
Connect redundant NICs with a crossover Cat-5 cable Connect Serial ports with a Null Modem cable
Edit HA config files in /etc/ha.d:
ha.cf haresources authkeys
Disable HA services from running at boot time:
chkconfig --level smb 23456 off chkconfig --level httpd 23456 off chkconfig --level named 23456 off
Duplicate Apache's documentroot (Rsync) Duplicate Samba's domain stuff (Copy smbpasswd to both machines) Duplicate DNS files
Start the HA service or reboot both machines:
/etc/init.d/heartbeat start
Regards
Doug P
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