summaryrefslogtreecommitdiffstats
path: root/doc/sync/primary-backup.sh
blob: 34c1cfa45a574033816c33a98e76040a5dfff124 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
#!/bin/sh
# 
# (C) 2008 by Pablo Neira Ayuso <pablo@netfilter.org>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
#
# Description:
#
# This is the script for primary-backup setups for keepalived
# (http://www.keepalived.org). You may adapt it to make it work with other
# high-availability managers.
#
# Do not forget to include the required modifications to your keepalived.conf
# file to invoke this script during keepalived's state transitions.
#
# Contributions to improve this script are welcome :).
#

CONNTRACKD_BIN=/usr/sbin/conntrackd
CONNTRACKD_LOCK=/var/lock/conntrack.lock
CONNTRACKD_CONFIG=/etc/conntrackd/conntrackd.conf

case "$1" in
  primary)
    #
    # commit the external cache into the kernel table
    #
    $CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -c
    if [ $? -eq 1 ]
    then
        logger "ERROR: failed to invoke conntrackd -c"
    fi

    #
    # flush the internal and the external caches
    #
    $CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -f
    if [ $? -eq 1 ]
    then
    	logger "ERROR: failed to invoke conntrackd -f"
    fi

    #
    # resynchronize my internal cache to the kernel table
    #
    $CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -R
    if [ $? -eq 1 ]
    then
    	logger "ERROR: failed to invoke conntrackd -R"
    fi

    #
    # send a bulk update to backups 
    #
    $CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -B
    if [ $? -eq 1 ]
    then
        logger "ERROR: failed to invoke conntrackd -B"
    fi
    ;;
  backup)
    #
    # is conntrackd running? request some statistics to check it
    #
    $CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -s
    if [ $? -eq 1 ]
    then
        #
	# something's wrong, do we have a lock file?
	#
    	if [ -f $CONNTRACKD_LOCK ]
	then
	    logger "WARNING: conntrackd was not cleanly stopped."
	    logger "If you suspect that it has crashed:"
	    logger "1) Enable coredumps"
	    logger "2) Try to reproduce the problem"
	    logger "3) Post the coredump to netfilter-devel@vger.kernel.org"
	    rm -f $CONNTRACKD_LOCK
	fi
	$CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -d
	if [ $? -eq 1 ]
	then
	    logger "ERROR: cannot launch conntrackd"
	    exit 1
	fi
    fi
    #
    # shorten kernel conntrack timers to remove the zombie entries.
    #
    $CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -t
    if [ $? -eq 1 ]
    then
    	logger "ERROR: failed to invoke conntrackd -t"
    fi

    #
    # request resynchronization with master firewall replica (if any)
    # Note: this does nothing in the alarm approach.
    #
    $CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -n
    if [ $? -eq 1 ]
    then
    	logger "ERROR: failed to invoke conntrackd -n"
    fi
    ;;
  fault)
    #
    # shorten kernel conntrack timers to remove the zombie entries.
    #
    $CONNTRACKD_BIN -C $CONNTRACKD_CONFIG -t
    if [ $? -eq 1 ]
    then
    	logger "ERROR: failed to invoke conntrackd -t"
    fi
    ;;
  *)
    logger "ERROR: unknown state transition"
    echo "Usage: primary-backup.sh {primary|backup|fault}"
    exit 1
    ;;
esac

exit 0