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1a32fc4a6c
Patch add support for Confdb integration with SAM. It's now possible to
use SAM_RECOVERY_POLICY_CONFDB as flag to previous policies.
Also new function sam_mark_failed is added for ability to use RECOVERY
policy together with confdb and get expected results (specially with
integration with corosync watchdog)
Patch also makes SAM thread safe.
git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@3050 fd59a12c-fef9-0310-b244-a6a79926bd2f
124 lines
4.5 KiB
Groff
124 lines
4.5 KiB
Groff
.\"/*
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.\" * Copyright (c) 2009-2010 Red Hat, Inc.
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.\" *
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.\" * All rights reserved.
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.\" *
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.\" * Author: Jan Friesse (jfriesse@redhat.com)
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.\" *
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.\" * This software licensed under BSD license, the text of which follows:
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.\" *
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.\" * Redistribution and use in source and binary forms, with or without
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.\" * modification, are permitted provided that the following conditions are met:
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.\" *
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.\" * - Redistributions of source code must retain the above copyright notice,
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.\" * this list of conditions and the following disclaimer.
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.\" * - Redistributions in binary form must reproduce the above copyright notice,
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.\" * this list of conditions and the following disclaimer in the documentation
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.\" * and/or other materials provided with the distribution.
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.\" * - Neither the name of the Red Hat, Inc. nor the names of its
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.\" * contributors may be used to endorse or promote products derived from this
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.\" * software without specific prior written permission.
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.\" *
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.\" * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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.\" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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.\" * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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.\" * THE POSSIBILITY OF SUCH DAMAGE.
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.\" */
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.TH "SAM_INITIALIZE" 3 "21/05/2010" "corosync Man Page" "Corosync Cluster Engine Programmer's Manual"
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.SH NAME
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.P
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sam_initialize \- Initialize health checking
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.SH SYNOPSIS
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.P
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\fB#include <corosync/sam.h>\fR
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.P
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\fBcs_error_t sam_initialize (int\fR \fItime_interval\fR\fB, sam_recovery_policy_t \fIrecovery_policy\fR);\fR
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.SH DESCRIPTION
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.P
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The \fBsam_initialize\fR function is used to initialize health checking of a process.
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.P
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Application can have only one instance of SAM. This function must be called
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before any other of SAM functions. It is recommended to initialize before the
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process begins any process initialization.
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.P
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The \fItime_interval\fR parameter is a timeout in milliseconds before taking
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recovery action after having not received a healthcheck.
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If \fItime_interval\fR parameter is zero, there is no time limit and no
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healthcheck must be sent by the process. In this operational mode, a process
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failure will continue to execute the recovery policy.
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.P
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The \fIrecovery_policy\fR is defined as type:
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.nf
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typedef enum {
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SAM_RECOVERY_POLICY_QUIT = 1,
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SAM_RECOVERY_POLICY_RESTART = 2,
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SAM_RECOVERY_POLICY_QUORUM = 0x08,
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SAM_RECOVERY_POLICY_QUORUM_QUIT = SAM_RECOVERY_POLICY_QUORUM | SAM_RECOVERY_POLICY_QUIT,
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SAM_RECOVERY_POLICY_QUORUM_RESTART = SAM_RECOVERY_POLICY_QUORUM | SAM_RECOVERY_POLICY_RESTART,
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SAM_RECOVERY_POLICY_CONFDB = 0x10,
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} sam_recovery_policy_t;
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.fi
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.P
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where
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.TP
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SAM_RECOVERY_POLICY_QUIT
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on failure, the process will terminate.
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.TP
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SAM_RECOVERY_POLICY_RESTART
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on failure, the process will restart.
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.TP
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SAM_RECOVERY_POLICY_QUORUM
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is not policy. Used only as flag meaning quorum integration
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.TP
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SAM_RECOVERY_POLICY_QUORUM_QUIT
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same as \fISAM_RECOVERY_POLICY_QUIT\fR but \fBsam_start (3)\fR will block until corosync becomes
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quorate and process will be terminated if quorum is lost.
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.TP
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SAM_RECOVERY_POLICY_QUORUM_RESTART
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same as \fISAM_RECOVERY_POLICY_RESTART\fR but \fBsam_start (3)\fR will block until corosync becomes
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quorate and process will be restarted if quorum is lost.
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.TP
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SAM_RECOVERY_POLICY_CONFDB
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is not policy. Used only as flag meaning confdb integration. It can be used with all previous policies.
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.P
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To perform event driven healthchecking, \fBsam_register(3)\fR and
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\fBsam_start(3)\fR functions must called. Event driven healthchecking causes
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the duplicate standby process running the SAM serve rto periodically request
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healthchecks from the active process.
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.SH RETURN VALUE
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.P
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This call return CS_OK value if successful, otherwise and error is returned.
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.SH ERRORS
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.TP
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CS_ERR_BAD_HANDLE
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can happened in case of double initialization.
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.TP
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CS_ERR_INVALID_PARAM
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\fIrecovery_policy\fR has invalid value.
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.SH "SEE ALSO"
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.BR sam_register (3),
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.BR sam_start (3),
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.BR sam_hc_callback_register (3)
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