This script will take all the necessary checks before rebooting any UNIX servers without any harm
#!/bin/bash
##———- Author : Bibhuti Bhusan B —————————————————-##
##———- Blog site :https://github.com/bibhuti2sol/health-check-script ——–##
##———- Purpose : To quickly check and report health status in a linux system.———-##
##———- Tested on : RHEL8/7/6/, SLES/SLED 15/12/11, Ubuntu20/18/16, CentOS , ———–##
##———- Boss6(Debian) variants. It may work on other vari as well, but not tested. —–##
##———- Updated version : v3.1 (Updated on 16th Oct 2021) ——————————##
##—–NOTE: This script requires root privileges, otherwise one could run the script ——-##
##—- as a sudo user who got root privileges. ———————————————-##
##———– “sudo /bin/bash <ScriptName>” ————————————————-##
#——variables used——#
S=”************************************”
D=”————————————-“
COLOR=”y”
MOUNT=$(mount|egrep -iw “ext4|ext3|xfs|gfs|gfs2|btrfs”|grep -v “loop”|sort -u -t’ ‘ -k1,2)
FS_USAGE=$(df -PThl -x tmpfs -x iso9660 -x devtmpfs -x squashfs|awk ‘!seen[$1]++’|sort -k6n|tail -n +2)
IUSAGE=$(df -iPThl -x tmpfs -x iso9660 -x devtmpfs -x squashfs|awk ‘!seen[$1]++’|sort -k6n|tail -n +2)
if [ $COLOR == y ]; then
{
GCOLOR=”\e[47;32m —— OK/HEALTHY \e[0m”
WCOLOR=”\e[43;31m —— WARNING \e[0m”
CCOLOR=”\e[47;31m —— CRITICAL \e[0m”
}
else
{
GCOLOR=” —— OK/HEALTHY “
WCOLOR=” —— WARNING “
CCOLOR=” —— CRITICAL “
}
fi
echo -e “$S”
echo -e “\tSystem Health Status”
echo -e “$S”
#——–Print Operating System Details——–#
hostname -f &> /dev/null && printf “Hostname : $(hostname -f)” || printf “Hostname : $(hostname -s)”
echo -en “\nOperating System : “
[ -f /etc/os-release ] && echo $(egrep -w “NAME|VERSION” /etc/os-release|awk -F= ‘{ print $2 }’|sed ‘s/”//g’) || cat /etc/system-release
echo -e “Kernel Version :” $(uname -r)
printf “OS Architecture :”$(arch | grep x86_64 &> /dev/null) && printf ” 64 Bit OS\n” || printf ” 32 Bit OS\n”
#——–Print system uptime——-#
UPTIME=$(uptime)
echo -en “System Uptime : “
echo $UPTIME|grep day &> /dev/null
if [ $? != 0 ]; then
echo $UPTIME|grep -w min &> /dev/null && echo -en “$(echo $UPTIME|awk ‘{print $2” by “$3}’|sed -e ‘s/,.*//g’) minutes” \
|| echo -en “$(echo $UPTIME|awk ‘{print $2” by “$3” “$4}’|sed -e ‘s/,.*//g’) hours”
else
echo -en $(echo $UPTIME|awk ‘{print $2″ by “$3” “$4” “$5″ hours”}’|sed -e ‘s/,//g’)
fi
echo -e “\nCurrent System Date & Time : “$(date +%c)
#——–Check for any read-only file systems——–#
echo -e “\nChecking For Read-only File System[s]”
echo -e “$D”
echo “$MOUNT”|grep -w ro && echo -e “\n…..Read Only file system[s] found”|| echo -e “…..No read-only file system[s] found. “
#——–Check for currently mounted file systems——–#
echo -e “\n\nChecking For Currently Mounted File System[s]”
echo -e “$D$D”
echo “$MOUNT”|column -t
#——–Check disk usage on all mounted file systems——–#
echo -e “\n\nChecking For Disk Usage On Mounted File System[s]”
echo -e “$D$D”
echo -e “( 0-85% = OK/HEALTHY, 85-95% = WARNING, 95-100% = CRITICAL )”
echo -e “$D$D”
echo -e “Mounted File System[s] Utilization (Percentage Used):\n”
COL1=$(echo “$FS_USAGE”|awk ‘{print $1 ” “$7}’)
COL2=$(echo “$FS_USAGE”|awk ‘{print $6}’|sed -e ‘s/%//g’)
for i in $(echo “$COL2”); do
{
if [ $i -ge 95 ]; then
COL3=”$(echo -e $i”% $CCOLOR\n$COL3″)”
elif [[ $i -ge 85 && $i -lt 95 ]]; then
COL3=”$(echo -e $i”% $WCOLOR\n$COL3″)”
else
COL3=”$(echo -e $i”% $GCOLOR\n$COL3″)”
fi
}
done
COL3=$(echo “$COL3″|sort -k1n)
paste <(echo “$COL1”) <(echo “$COL3”) -d’ ‘|column -t
#——–Check for any zombie processes——–#
echo -e “\n\nChecking For Zombie Processes”
echo -e “$D”
ps -eo stat|grep -w Z 1>&2 > /dev/null
if [ $? == 0 ]; then
echo -e “Number of zombie process on the system are :” $(ps -eo stat|grep -w Z|wc -l)
echo -e “\n Details of each zombie processes found “
echo -e “ $D”
ZPROC=$(ps -eo stat,pid|grep -w Z|awk ‘{print $2}’)
for i in $(echo “$ZPROC”); do
ps -o pid,ppid,user,stat,args -p $i
done
else
echo -e “No zombie processes found on the system.”
fi
#——–Check Inode usage——–#
echo -e “\n\nChecking For INode Usage”
echo -e “$D$D”
echo -e “( 0-85% = OK/HEALTHY, 85-95% = WARNING, 95-100% = CRITICAL )”
echo -e “$D$D”
echo -e “INode Utilization (Percentage Used):\n”
COL11=$(echo “$IUSAGE”|awk ‘{print $1” “$7}’)
COL22=$(echo “$IUSAGE”|awk ‘{print $6}’|sed -e ‘s/%//g’)
for i in $(echo “$COL22”); do
{
if [[ $i = *[[:digit:]]* ]]; then
{
if [ $i -ge 95 ]; then
COL33=”$(echo -e $i”% $CCOLOR\n$COL33″)”
elif [[ $i -ge 85 && $i -lt 95 ]]; then
COL33=”$(echo -e $i”% $WCOLOR\n$COL33″)”
else
COL33=”$(echo -e $i”% $GCOLOR\n$COL33″)”
fi
}
else
COL33=”$(echo -e $i”% (Inode Percentage details not available)\n$COL33″)”
fi
}
done
COL33=$(echo “$COL33″|sort -k1n)
paste <(echo “$COL11”) <(echo “$COL33”) -d’ ‘|column -t
#——–Check for SWAP Utilization——–#
echo -e “\n\nChecking SWAP Details”
echo -e “$D”
echo -e “Total Swap Memory in MiB : “$(grep -w SwapTotal /proc/meminfo|awk ‘{print $2/1024}’)”, in GiB : “\
$(grep -w SwapTotal /proc/meminfo|awk ‘{print $2/1024/1024}’)
echo -e “Swap Free Memory in MiB : “$(grep -w SwapFree /proc/meminfo|awk ‘{print $2/1024}’)”, in GiB : “\
$(grep -w SwapFree /proc/meminfo|awk ‘{print $2/1024/1024}’)
#——–Check for Processor Utilization (current data)——–#
echo -e “\n\nChecking For Processor Utilization”
echo -e “$D”
echo -e “\nCurrent Processor Utilization Summary :\n”
mpstat|tail -2
#——–Check for load average (current data)——–#
echo -e “\n\nChecking For Load Average”
echo -e “$D”
echo -e “Current Load Average : $(uptime|grep -o “load average.*”|awk ‘{print $3″ ” $4″ ” $5}’)”
#——Print most recent 3 reboot events if available—-#
echo -e “\n\nMost Recent 3 Reboot Events”
echo -e “$D$D”
last -x 2> /dev/null|grep reboot 1> /dev/null && /usr/bin/last -x 2> /dev/null|grep reboot|head -3 || \
echo -e “No reboot events are recorded.”
#——Print most recent 3 shutdown events if available—–#
echo -e “\n\nMost Recent 3 Shutdown Events”
echo -e “$D$D”
last -x 2> /dev/null|grep shutdown 1> /dev/null && /usr/bin/last -x 2> /dev/null|grep shutdown|head -3 || \
echo -e “No shutdown events are recorded.”
#——–Print top 5 Memory & CPU consumed process threads———#
#——–excludes current running program which is hwlist———-#
echo -e “\n\nTop 5 Memory Resource Hog Processes”
echo -e “$D$D”
ps -eo pmem,pid,ppid,user,stat,args –sort=-pmem|grep -v $$|head -6|sed ‘s/$/\n/’
echo -e “\nTop 5 CPU Resource Hog Processes”
echo -e “$D$D”
ps -eo pcpu,pid,ppid,user,stat,args –sort=-pcpu|grep -v $$|head -6|sed ‘s/$/\n/’
echo -e “NOTE:- If any of the above fields are marked as \”blank\” or \”NONE\” or \”UNKNOWN\” or \”Not Available\” or \”Not Specified\”
that means either there is no value present in the system for these fields, otherwise that value may not be available,
or suppressed since there was an error in fetching details.”
echo -e “\n\t\t %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%”
echo -e “\t\t <>——–<> Powered By : wordpress <>——–<>”
echo -e “\t\t %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%”
By: Bibhuti Bhusan
MyBlog 
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