Patrick Williams | d8c66bc | 2016-06-20 12:57:21 -0500 | [diff] [blame^] | 1 | #! /bin/sh |
| 2 | # |
| 3 | # kdump |
| 4 | # |
| 5 | # Description: The kdump script provides the support: |
| 6 | # 1. Load a kdump kernel image into memory; |
| 7 | # 2. Copy away vmcore when system panic. |
| 8 | # |
| 9 | |
| 10 | #default |
| 11 | KDUMP_KVER="`uname -r`" |
| 12 | KDUMP_KIMAGE="/boot/bzImage-${KDUMP_KVER}" |
| 13 | KDUMP_CMDLINE="`cat /proc/cmdline`" |
| 14 | KDUMP_CMDLINE_APPEND="kdump_needed maxcpus=1 irqpoll reset_devices" |
| 15 | KDUMP_VMCORE_PATH="/var/crash/`date +"%Y-%m-%d"`" |
| 16 | |
| 17 | #get right kernel image |
| 18 | march="`uname -m`" |
| 19 | case ${march} in |
| 20 | x86*|i?86) |
| 21 | ;; |
| 22 | *) |
| 23 | KDUMP_KIMAGE="/boot/uImage-${KDUMP_KVER}" |
| 24 | ;; |
| 25 | esac |
| 26 | |
| 27 | KEXEC=usr/sbin/kexec |
| 28 | KEXEC_ARGS="-p" |
| 29 | |
| 30 | MAKEDUMPFILE=/usr/bin/makedumpfile |
| 31 | MAKEDUMPFILE_ARGS="-E -d 1" |
| 32 | |
| 33 | LOGGER="logger -p info -t kdump" |
| 34 | |
| 35 | if [ -f /etc/sysconfig/kdump.conf ]; then |
| 36 | . /etc/sysconfig/kdump.conf |
| 37 | fi |
| 38 | |
| 39 | do_check() |
| 40 | { |
| 41 | #check makedumpfile |
| 42 | if [ ! -e ${MAKEDUMPFILE} -o ! -x ${MAKEDUMPFILE} ] ;then |
| 43 | echo "No makedumpfile found." |
| 44 | return 1; |
| 45 | fi |
| 46 | |
| 47 | #check kexec |
| 48 | if [ ! -e ${KEXEC} -o ! -x ${KEXEC} ] ;then |
| 49 | echo "No kexec found." |
| 50 | return 1; |
| 51 | fi |
| 52 | |
| 53 | #check whether kdump kernel image exists on the system |
| 54 | if [ ! -f ${KDUMP_KIMAGE} ]; then |
| 55 | echo "No kdump kernel image found." |
| 56 | return 1 |
| 57 | fi |
| 58 | } |
| 59 | |
| 60 | do_save_vmcore() |
| 61 | { |
| 62 | mkdir -p ${KDUMP_VMCORE_PATH} |
| 63 | echo "Saving a vmcore to ${KDUMP_VMCORE_PATH}." |
| 64 | |
| 65 | ${MAKEDUMPFILE} ${MAKEDUMPFILE_ARGS} /proc/vmcore ${KDUMP_VMCORE_PATH}/vmcore-"`date +"%H:%M:%S"`" |
| 66 | # cp --sparse=always /proc/vmcore ${KDUMP_VMCORE_PATH}/vmcore-"`date +"%H:%M:%S"`" |
| 67 | rc=$? |
| 68 | if [ ${rc} == 0 ]; then |
| 69 | ${LOGGER} "Saved a vmcore to ${KDUMP_VMCORE_PATH}." |
| 70 | else |
| 71 | ${LOGGER} "Failed to save vmcore!" |
| 72 | fi |
| 73 | return ${rc} |
| 74 | } |
| 75 | |
| 76 | do_start() |
| 77 | { |
| 78 | #check file |
| 79 | do_check |
| 80 | |
| 81 | #check whether the running kernel supports kdump. |
| 82 | if [ ! -e /sys/kernel/kexec_crash_loaded ]; then |
| 83 | echo "Kdump isn't supported on the running kernel!!!" |
| 84 | ${LOGGER} "Kdump isn't supported on the running kernel!!!" |
| 85 | return 1 |
| 86 | fi |
| 87 | |
| 88 | #check whether kdump kernel image has been loaded |
| 89 | rc=`cat /sys/kernel/kexec_crash_loaded` |
| 90 | if [ ${rc} != 0 ]; then |
| 91 | echo "Kdump is already running."; |
| 92 | ${LOGGER} "Kdump is already running." |
| 93 | return 0 |
| 94 | fi |
| 95 | |
| 96 | #check the running kernel cmdline option,insure "crashkenrel=" always set. |
| 97 | grep -q crashkernel= /proc/cmdline |
| 98 | if [ $? != 0 ]; then |
| 99 | echo "Kdump isn't supported on the running kernel,please check boot option!!!" |
| 100 | ${LOGGER} "Kdump isn't supported on the running kernel,please check boot option!!!" |
| 101 | return 1 |
| 102 | fi |
| 103 | |
| 104 | #handle kdump cmdline parameters, remove some useless options |
| 105 | kcmdline="" |
| 106 | for x in `cat /proc/cmdline`; do |
| 107 | case $x in |
| 108 | crashkernel*) |
| 109 | ;; |
| 110 | *) |
| 111 | kcmdline="${kcmdline} $x" |
| 112 | ;; |
| 113 | esac |
| 114 | done |
| 115 | |
| 116 | KDUMP_CMDLINE="${kcmdline} ${KDUMP_CMDLINE_APPEND}" |
| 117 | |
| 118 | #Load the kdump kernel image |
| 119 | ${KEXEC} ${KEXEC_ARGS} "${KDUMP_KIMAGE}" --append="${KDUMP_CMDLINE}" |
| 120 | if [ $? != 0 ]; then |
| 121 | echo "Failed to load kdump kernel!" |
| 122 | ${LOGGER} "Failed to load kdump kernel!" |
| 123 | return 1 |
| 124 | fi |
| 125 | |
| 126 | echo "Kdump started up." |
| 127 | ${LOGGER} "Kdump started up." |
| 128 | } |
| 129 | |
| 130 | do_stop() |
| 131 | { |
| 132 | ${KEXEC} -p -u 2>/dev/null |
| 133 | if [ $? == 0 ]; then |
| 134 | echo "Kdump has been stopped." |
| 135 | ${LOGGER} "Kdump has been stopped." |
| 136 | else |
| 137 | echo "Failed to stop kdump!" |
| 138 | ${LOGGER} "Failed to stop kdump!" |
| 139 | fi |
| 140 | } |
| 141 | |
| 142 | case "$1" in |
| 143 | start) |
| 144 | if [ -s /proc/vmcore ]; then |
| 145 | do_save_vmcore |
| 146 | reboot |
| 147 | else |
| 148 | do_start |
| 149 | fi |
| 150 | ;; |
| 151 | restart) |
| 152 | do_stop |
| 153 | do_start |
| 154 | ;; |
| 155 | stop) |
| 156 | do_stop |
| 157 | ;; |
| 158 | *) |
| 159 | echo $"Usage: $0 {start|stop|restart}" |
| 160 | exit 1 |
| 161 | esac |
| 162 | |
| 163 | exit $? |