source: trunk/packages/invirt-xen-config/debian/invirt-xen-config.init @ 1462

Last change on this file since 1462 was 1462, checked in by broder, 15 years ago

Add some additional documentation on how the sysvm disk locking works

  • Property svn:executable set to *
File size: 2.2 KB
RevLine 
[1275]1#!/bin/bash
[1257]2### BEGIN INIT INFO
3# Provides:          invirt-xen-config
4# Required-Start:    $local_fs $remote_fs
5# Required-Stop:     $local_fs $remote_fs
6# Default-Start:     2 3 4 5
7# Default-Stop:      0 1 6
8# Short-Description: Startup script for the Invirt Xen host
9# Description:       
10### END INIT INFO
11
[1261]12PACKAGE=invirt-xen-config
[1275]13NAME="$PACKAGE"
[1280]14DESC="Invirt Xen host"
[1261]15PARENTPACKAGE=xend
[1457]16GEN_FILES=(/etc/xen/xend-config.sxp.invirt)
17SYSVMS=(s_master s_remote s_console)
18i=1
19for vm in "${SYSVMS[@]}"; do
[1460]20    GEN_FILES[$i]="/etc/xen/sysvms/$vm"
[1459]21    i=$((i + 1))
[1457]22done
[1257]23
[1261]24dpkg -s "$PACKAGE" >/dev/null 2>/dev/null || exit 0
25
26. /lib/init/gen-files.sh
27. /lib/init/std-init.sh
28
[1457]29start_sysvm() {
30    # Attempt to start a sysvm, but only if it's not running already
31    # somewhere on the cluster
32   
33    VM="$1"
34    DISK="/dev/xenvg/${VM}_hda"
35   
36    # Don't bother trying to start the VM if it's already running
37    if xm list "$1" >/dev/null 2>&1; then
38        return 1
39    fi
40   
41    if lvchange -a n "$DISK" >/dev/null 2>&1 && lvchange -a ey "$DISK" >/dev/null 2>&1; then
[1462]42        # If we can disable and then re-enable the VMs disk, then the
43        # VM can't be running. If the lvchange -a ey succeeds, then we
44        # have an exclusive lock across the cluster on enabling the
45        # disk, which avoids the potential race condition of two hosts
46        # starting a VM at the same time
[1457]47        [ "$VERBOSE" != no ] && log_daemon_msg "Starting sysvm $VM"
48        xm create "sysvms/$VM" >/dev/null
49        [ "$VERBOSE" != no ] && log_end_msg $?
50        RET=0
51    else
52        RET=1
53    fi
54   
55    # Regardless of whether we could get the lock or not, the
56    # lvchange -a n probably disabled the LV somewhere; be sure we
57    # clean up
58    lvchange -a y "$DISK" >/dev/null 2>&1
59   
60    return $RET
61}
62
[1275]63do_startup() {
[1261]64    gen_files
65   
[1457]66    for vm in "${SYSVMS[@]}"; do
67        start_sysvm "$vm"
68    done
69   
[1257]70    echo 1 >/proc/sys/net/ipv4/ip_forward
[1261]71    for i in all default; do
72        echo 1 >/proc/sys/net/ipv4/conf/$i/rp_filter
73        echo 1 >/proc/sys/net/ipv4/conf/$i/proxy_arp
[1257]74    done
[1261]75   
76    invoke-rc.d "$PARENTPACKAGE" "$1"
77}
78
[1275]79do_start() {
80    do_startup "start"
81}
82
[1261]83do_reload() {
[1275]84    do_startup "reload"
[1261]85}
86
87do_stop() {
[1277]88    invoke-rc.d "$PARENTPACKAGE" stop
[1261]89}
90
91std_init "$1"
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