这是一张 VPS 托管的 Centos5 64 位 Linux 服务器的 OCR 截图，该服务器刚刚冻结了。我现在已经重新启动了此 VPS 客户端，但如果有谁了解以下内容，可以告知是什么原因导致了锁定，我将不胜感激。
截图如下：https://i.stack.imgur.com/RVSs8.png
我的 OCR 粗略图如下：
cpu 1 cold: high 0, batch 1 used:0 DMA32 per-cpu: cpu 0 hot: high 186, batch 31 used:29 cpu 0 cold: high 62, batch 15 used:27 cpu 1 hot: high 186, batch 31 used:58 cpu 1 cold: high 62, batch 15 used:52 Normal per-cpu: empty HighMem per-cpu: empty Free pages: 7360kB (31KB HighMem) Active:127313 inactive:82099 dirty:0 writeback:0 unstable:0 free:1840 slab:18478 mapped-file:546 mapped-anon:210605 pagetables:14991 DMA free:3240kB min:32kB low:40kB high:48kB active:0kB inactive:0kB present:9052H pages_scanned:0 all_unreclairnable? yes lowmem reserve[]: 0 1002 1002 1002 DMA32 free:4120kB min:4032kB low:5040kB high:6048kB active:509272kB inactive:328376kB present:102616 afl pages_scanned :2342 all_unreclairnable, no lowmem_reserve[] : 0 0 0 0 Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unr eclaimable? no lowmem_reserve[]: 0 0 0 0 HighMem free:0kB min: 128kB low : 128kB high :128kB active:0kB inactive:0kB present :0kB pages_scanned:0 I all_unreclaimable? no lowmem reserve[]: 0 0 0 0 DMA: 0.4kB 1.8kB 2.16kB 2.321,B 1.64kB 2.128kB 1.256kB 1.512kB ,1024kB 0.2048kB 0.4096kB = 3240kB DMA32: 68.4kB 1.8kB 2.16kB 57.3aB 9.64kB 1.128kB 1.256kB 0.512kB 1.1024kB 0.2048kB 0.4096kB = 4120k Normal : empty HighMem: empty 6100 pagecache pages swap cache: add 15557050, delete 15551562, find 330898601/333226192, race 14.1430 Free swap = 0kB Total swap = 1048568kB
答案1
密切关注您的交换使用情况（或只是开始记录它）。
如果您没有任何可用的监控工具（例如sar），请将下面的脚本放入 cron 中并让其每分钟运行一次。
计划任务
#minute (0-59),
#| hour (0-23),
#| | day of the month (1-31),
#| | | month of the year (1-12),
#| | | | day of the week (0-6, 0=Sun)
#| | | | | commands
* * * * * /path/to/cronjob-check_swap.ksh >> /path/to/check_swap.log
CronJob-Check_Swap.ksh
## Script to call the check_swap.ksh script & Date/Time stamp the output
$DATECMD="date" ## Modify to get a date/time stamp in the format you like
printf "`$DATECMD` : `/path/to/check_swap.ksh`"
Check_Swap.ksh（适用于 Linux、Solaris 和 HP-UX 11.11）
#!/bin/ksh
# check_swap.ksh
# Outputs swap usage in a human-readable one-liner.
# Used to quickly check a system's swap.
#
# Works on the following platforms;
# HP-UX B.11.11 on PA-RISC
# SunOS 5.10 on SPARC (global zone)
# SunOS 5.10 on SPARC (non-global)
# RHEL5/6 on x86 & x86_64
#
##############################################################################
## GENERIC ENVIRONMENT VARIABLES
# The full paths of things. Should be consistent across all platforms.
OSTYPE=$( /bin/uname )
PRINTF=/usr/bin/printf
GREP=/bin/grep
ECHO=/bin/echo
AWK=/bin/awk
SED=/bin/sed
##############################################################################
## SPECIFIC ENVIRONMENT VARIABLES
# Variables used for this script
SWAP_TOTAL=0
SWAP_USED=0
SWAP_FREE=0
PERCENT_USED=0
PERCENT_FREE=0
##############################################################################
## DEBUG
# A function that we sprinkle in our script to show us the raw vars.
DEBUG(){
${PRINTF} "===== DEBUG =====\n"
[ -z ${OSTYPE} ] || ${PRINTF} " OSTYPE = ${OSTYPE} \n"
[ -z ${DATETIME} ] || ${PRINTF} " Date / Time = ${DATETIME} \n"
[ -z ${SWAP} ] || ${PRINTF} " Swap Command = ${SWAP} \n"
[ -z ${SOD_T} ] || ${PRINTF} " Swap-On-Disk Total (MB) = ${SOD_T} \n"
[ -z ${SOD_F} ] || ${PRINTF} " Swap-On-Disk Free (MB) = ${SOD_F} \n"
[ -z ${SOD_U} ] || ${PRINTF} " Swap-On-Disk Used (MB) = ${SOD_U} \n"
[ -z ${STMP} ] || ${PRINTF} " Swap Total/Used (MB) = ${STMP} \n"
${PRINTF} "===== DEBUG =====\n"
}
##############################################################################
## THRESHOLD CONTROLS - Where we define our thresholds and color-coding.
#
# Colors
cf="\033[0m" # Color Off
hi="\033[31m" # Red
lo="\033[33m" # Yellow
go="\033[32m" # green
# Thresholds
TH_PR="10:20"
TH_SZ="512:1024"
##############################################################################
## SWAP_ON_DISK - calculates the usage of swap devices
# stu (Swap Total, Used ) = "Total:Used" in Blocks (if needed).
# stmp (Swap Temp) = "Total:Used" in KiloBytes.
# STMP (Swap Temp) = "Total:Used" in MegaBytes.
SWAP_ON_DISK(){
case ${OSTYPE} in
# Solaris reports swap statistics in blocks (512 bytes = 1 block).
SunOS)
# Our command to query swap-on-disk
SWAP="/usr/sbin/swap -l"
sod_tf=$(${SWAP}|${AWK} '!/swaplo/{t+=$4;f+=$5}END{printf"%.f:%.f",t,f}')
# Swap-on-Disk Total (Megabytes)
SOD_T=$(( ( ( ${sod_tf%%:*} * 512 ) / 1024 ) / 1024 ))
# Swap-On-Disk Free (Megabytes)
SOD_F=$(( ( ( ${sod_tf#*:} * 512 ) / 1024 ) / 1024 ))
# Swap-On-Disk Used (already in Megabytes)
SOD_U=$(( ${SOD_T} - ${SOD_F} ))
# STMP (Swap Temp) = "Total:Used" in MegaBytes.
STMP=${SOD_T}:${SOD_U}
;;
# HP-UX reports swap usage in kilobytes by default.
HP-UX)
# Our command to query swap-on-disk
SWAP="/usr/sbin/swapinfo -tdfm"
# Swap Temp = "Total:Used" (in MB)
STMP=$( ${SWAP}|${AWK} '/total/{t+=$2;u+=$3}END{printf"%.f:%.f",t,u}')
;;
# Linux reports swap usage in kilobytes by default.
Linux)
# Our command to query swap-on-disk (can't use 'free -om', its a RHELism)
SWAP="/sbin/swapon -s"
sod_tu=$(${SWAP}|${AWK} '!/File/{t+=$3;u+=$4}END{printf"%.f:%.f",t,u}')
sod_t=$(( ${sod_tu%%:*} / 1024 ))
sod_u=$(( ${sod_tu#*:} / 1024 ))
STMP=${sod_t}:${sod_u}
;;
esac
}
##############################################################################
## SWAP_AND_RESERVE - checks swap just like top, glance and HP OMW
# Basically, this counts the 'Reserve' of RAM as well.
# NOTE: On a Solaris Non-Global Zone, the 'Reserve' is defined from the
# Global Zone, and is shared amongst each NGZ.
# This makes this check come back 'weird' sometimes.
# (Especially when the 'Reserve' is 25GB, which counts as 'used' swap,
# while the NGZ itself only has 4GB or 8GB of swap from a disk.
SWAP_RESERVE(){
case ${OSTYPE} in
SunOS)
# Our command to pull the 'swap summary' (includes the Reserve in RAM)
SWAP="/usr/sbin/swap -s"
sr_uf=$( ${SWAP}|${AWK} '{print $9":"$11}'|${SED} -e 's/k//g' )
# Swap+Reserve Used (in MB)
SR_U=$(( ${sr_uf%%:*} / 1024 ))
# Swap+Reserve Free (in MB)
SR_F=$(( ${sr_uf#*:} / 1024 ))
# Swap+Reserve Total (in MB) (Sum of Used & Free)
SR_T=$(( ${SR_U} + ${SR_F} ))
# Swap Temp = "Total:Used" (in MB)
STMP=${SR_T}:${SR_U}
;;
*)
STMP=""
;;
esac
}
##############################################################################
## FORMAT - splits all the vars and makes em pretty
# Requires STMP be set, and should be "Total:Used" (we calc 'Free')
FORMAT(){
SWAP_TOTAL=${STMP%%:*}
SWAP_USED=${STMP#*:}
SWAP_FREE=$(( ( ${SWAP_TOTAL} - ${SWAP_USED} ) ))
# Put a pretty comma every 3 digits.
ST="`${ECHO} ${SWAP_TOTAL}|${SED} -e :a -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta'`"
SF="`${ECHO} ${SWAP_FREE} |${SED} -e :a -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta'`"
SU="`${ECHO} ${SWAP_USED} |${SED} -e :a -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta'`"
# Calculate Percentages
PERCENT_FREE=$(( ( ${SWAP_FREE} * 100 ) / ${SWAP_TOTAL} ))
PERCENT_USED=$(( ( ${SWAP_USED} * 100 ) / ${SWAP_TOTAL} ))
PF=${PERCENT_FREE}
PU=${PERCENT_USED}
}
##############################################################################
## SCRIPT - Yay! Here we do stuff!
# Our command to query swap.
case ${OSTYPE} in
SunOS)
SWAP="/usr/sbin/swap -l"
;;
HP-UX)
SWAP="/usr/sbin/swapinfo -tdfm"
;;
Linux)
# (can't use 'free -om', its a RHELism)
SWAP="/sbin/swapon -s"
;;
*)
${PRINTF} "Unsupported OS ${OSTYPE}.\n"
exit 1
;;
esac
# Verify we can query swap
if [ ! -x ${SWAP%% *} ]; then
${PRINTF} "${SWAP%% *} not found or not executable by us.\n"
exit 1
fi
#
# Need a 'do we even have any swap to query' check here.
#
SWAP_ON_DISK
# DEBUG
[[ -z ${STMP} ]] || FORMAT
# DEBUG
[[ -z ${STMP} ]] || ${PRINTF} \
"Swap-on-Disk: ${SF}mb free (${PF}%%) of ${ST}mb total. ${SU}mb used (${PU}%%).
"
SWAP_RESERVE
[[ -z ${STMP} ]] || FORMAT
[[ -z ${STMP} ]] || ${PRINTF} \
"Swap+Reserve: ${SF}mb free (${PF}%%) of ${ST}mb total. ${SU}mb used (${PU}%%).
"
# EoF