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  4. ocf_heartbeat_portblock(7)

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OCF_HEARTBEAT_PORTBL(7) OCF resource agents OCF_HEARTBEAT_PORTBL(7)

NAME

ocf_heartbeat_portblock - Block and unblocks access to TCP and UDP ports

SYNOPSIS

portblock [start | stop | status | monitor | meta-data | validate-all]

DESCRIPTION

Resource script for portblock. It is used to temporarily block ports using iptables. In addition, it may allow for faster TCP reconnects for clients on failover. Use that if there are long lived TCP connections to an HA service. This feature is enabled by setting the tickle_dir parameter and only in concert with action set to unblock. Note that the tickle ACK function is new as of version 3.0.2 and hasn´t yet seen widespread use.

SUPPORTED PARAMETERS

protocol

The protocol used to be blocked/unblocked.

(required, string, no default)

portno

The port number used to be blocked/unblocked.

(required, string, no default)

action

The action (block/unblock) to be done on the protocol::portno.

(required, string, no default)

reset_local_on_unblock_stop

If for some reason the long lived server side TCP sessions won´t be cleaned up by a reconfiguration/flush/stop of whatever services this portblock protects, they would linger in the connection table, even after the IP is gone and services have been switched over to an other node.

An example would be the default NFS kernel server.

These "known" connections may seriously confuse and delay a later switchback.

Enabling this option will cause this agent to try to get rid of these connections by injecting a temporary iptables rule to TCP-reset outgoing packets from the blocked ports, and additionally tickle them locally, just before it starts to DROP incoming packets on "unblock stop".

(optional, boolean, default false)

ip

The IP address used to be blocked/unblocked.

(optional, string, default "0.0.0.0/0")

tickle_dir

The shared or local directory (_must_ be absolute path) which stores the established TCP connections.

(optional, string, no default)

sync_script

If the tickle_dir is a local directory, then the TCP connection state file has to be replicated to other nodes in the cluster. It can be csync2 (default), some wrapper of rsync, or whatever. It takes the file name as a single argument. For csync2, set it to "csync2 -xv".

(optional, string, no default)

SUPPORTED ACTIONS

This resource agent supports the following actions (operations):

start

Starts the resource. Suggested minimum timeout: 20.

stop

Stops the resource. Suggested minimum timeout: 20.

status

Performs a status check. Suggested minimum timeout: 10. Suggested interval: 10.

monitor

Performs a detailed status check. Suggested minimum timeout: 10. Suggested interval: 10.

meta-data

Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5.

validate-all

Performs a validation of the resource configuration. Suggested minimum timeout: 5.

EXAMPLE

The following is an example configuration for a portblock resource using the crm(8) shell:

primitive p_portblock ocf:heartbeat:portblock \


  params \


    protocol=string \


    portno=string \


    action=string \


  op monitor depth="0" timeout="10" interval="10"

SEE ALSO

http://www.linux-ha.org/wiki/portblock_(resource_agent)

AUTHOR

Linux-HA contributors (see the resource agent source for information about individual authors)

03/22/2017 resource-agents 3.9.2