I have two HA load balancers (hollywood and wolfman) running Corosync and Pacemaker. The eth1 interfaces are connected to the WAN, and the eth0 interfaces to the LAN, using a virtual IP as the gateway for the back end servers. The eth1 IP of hollywood is xxx.xxx.195.45, and the eth1 IP of wolfman is xxx.xxx.195.46. The bindnetaddr in Corosync is xxx.xxx.195.32, the same as the WAN's network address, and the Corosync port is the default 5405.
The relevant IP tables rules on both servers are:
*filter--flush:INPUT DROP--append INPUT --protocol udp --destination-port 5404 --jump ACCEPT--append INPUT --protocol udp --destination-port 5405 --jump ACCEPTThis setup seems to work fine, but initially I added --in-interface eth1 and --source xxx.xxx.195.46 to wolfman, and --source xxx.xxx.195.45 to hollywood. Most of the time this seemed to work, but rebooting the passive balancer sometimes killed communication between the load balancers, writing these errors to syslog:
[TOTEM ] Totem is unable to form a cluster because of an operating system or network fault. The most common cause of this message is that the local firewall is configured improperly.
So it seems that either my simplistic belief that all the Corosync traffic is directly between the two load balancers over eth1 is wrong, or that something else is causing a problem.
I'd like to lock port 5404/5405 down in IPTables to just the cluster. What do I need to do to make this happen?
Edit: corosync.conf as requested. This is all default Ubuntu other than the bindnetaddr.
# Please read the openais.conf.5 manual pagetotem { version: 2 # How long before declaring a token lost (ms) token: 3000 # How many token retransmits before forming a new configuration token_retransmits_before_loss_const: 10 # How long to wait for join messages in the membership protocol (ms) join: 60 # How long to wait for consensus to be achieved before starting a new round of membership configuration (ms) consensus: 3600 # Turn off the virtual synchrony filter vsftype: none # Number of messages that may be sent by one processor on receipt of the token max_messages: 20 # Limit generated nodeids to 31-bits (positive signed integers) clear_node_high_bit: yes # Disable encryption secauth: off # How many threads to use for encryption/decryption threads: 0 # Optionally assign a fixed node id (integer) # nodeid: 1234 # This specifies the mode of redundant ring, which may be none, active, or passive. rrp_mode: none interface { # The following values need to be set based on your environment ringnumber: 0 bindnetaddr: xxx.xxx.195.32 mcastaddr: 226.94.1.1 mcastport: 5405 }}amf { mode: disabled}service { # Load the Pacemaker Cluster Resource Manager ver: 0 name: pacemaker}aisexec { user: root group: root}logging { fileline: off to_stderr: yes to_logfile: no to_syslog: yes syslog_facility: daemon debug: off timestamp: on logger_subsys { subsys: AMF debug: off tags: enter|leave|trace1|trace2|trace3|trace4|trace6 }}
