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b304dc7fd7
When one server appears at the same position in multiple backends, it receives all the checks from all the backends exactly at the same time because the health-checks are only spread within a backend but not globally. Attached patch implements per-server start delay in a different way. Checks are now spread globally - not locally to one backend. It also makes them start faster - IMHO there is no need to add a 'server->inter' when calculating first execution. Calculation were moved from cfgparse.c to checks.c. There is a new function start_checks() and now it is not called when haproxy is started in MODE_CHECK. With this patch it is also possible to set a global 'spread-checks' parameter. It takes a percentage value (1..50, probably something near 5..10 is a good idea) so haproxy adds or removes that many percent to the original interval after each check. My test shows that with 18 backends, 54 servers total and 10000ms/5% it takes about 45m to mix them completely. I decided to use rand/srand pseudo-random number generator. I am aware it is not recommend for a good randomness but a) we do not need a good random generator here b) it is probably the most portable one.
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/*
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include/types/global.h
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Global variables.
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Copyright (C) 2000-2006 Willy Tarreau - w@1wt.eu
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation, version 2.1
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exclusively.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _TYPES_GLOBAL_H
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#define _TYPES_GLOBAL_H
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#include <netinet/in.h>
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#include <common/config.h>
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#include <types/task.h>
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/* modes of operation (global.mode) */
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#define MODE_DEBUG 1
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#define MODE_STATS 2
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#define MODE_LOG 4
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#define MODE_DAEMON 8
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#define MODE_QUIET 16
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#define MODE_CHECK 32
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#define MODE_VERBOSE 64
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#define MODE_STARTING 128
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#define MODE_FOREGROUND 256
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/* list of last checks to perform, depending on config options */
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#define LSTCHK_CAP_BIND 0x00000001 /* check that we can bind to any port */
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#define LSTCHK_CTTPROXY 0x00000002 /* check that tproxy is enabled */
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#define LSTCHK_NETADM 0x00000004 /* check that we have CAP_NET_ADMIN */
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#define LSTCHK_TCPSPLICE 0x00000008 /* check that linux tcp_splice is enabled */
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/* FIXME : this will have to be redefined correctly */
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struct global {
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int uid;
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int gid;
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int nbproc;
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int maxconn;
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int maxsock; /* max # of sockets */
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int rlimit_nofile; /* default ulimit-n value : 0=unset */
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int rlimit_memmax; /* default ulimit-d in megs value : 0=unset */
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int mode;
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int last_checks;
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int spread_checks;
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char *chroot;
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char *pidfile;
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int logfac1, logfac2;
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int loglev1, loglev2;
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struct sockaddr_in logsrv1, logsrv2;
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struct {
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int maxpollevents; /* max number of poll events at once */
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} tune;
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};
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extern struct global global;
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extern char *progname; /* program name */
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extern int pid; /* current process id */
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extern int actconn; /* # of active sessions */
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extern int listeners;
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extern char trash[BUFSIZE];
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extern const int zero;
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extern const int one;
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extern const struct linger nolinger;
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extern int stopping; /* non zero means stopping in progress */
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#endif /* _TYPES_GLOBAL_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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