Unix Admin Guide

Thursday, February 18, 2021

UNIX: How to print column nicely using printf

[user@hostfwnms1-oam tmp]# cat b.sh

printf "%-26s %-19s %-8s %-8s %-s %-s\n" HOSTNAME IP PING SNMPWALK 0-ok 1-fail

for i in `cat newhost2021 | awk '{print $1}'`

HOSTNAME=`cat newhost2021 | grep $i | awk '{print $2}'`

HOST=$i

ping -c 3 -W 2 $i > /dev/null

PINGSTATUS=$?

snmpwalk -v 2c -c public $i &> /dev/null

SNMPWLKSTATUS=$?

#echo "$HOSTNAME $HOST $PINGSTATUS $SNMPWLKSTATUS"| awk '{ print $1"\t\t" $2"\t\t" $3"\t\t" $4}'

echo "$HOSTNAME $HOST $PINGSTATUS $SNMPWLKSTATUS"| awk '{ printf "%-26s %-19s %-8s %-8s\n", $1, $2, $3, $4}'

done

[user@hostfwnms1-oam tmp]# sh b.sh

HOSTNAME IP PING SNMPWALK 0-ok 1-fail

hostfwhostlab2-ilo 101.123.125.18 0 1

hostfwsanctr05ctr1 101.123.125.22 0 1

hostfwsanctr05ctr2 101.123.125.23 1 1

hostcdrhost1-ilo 101.123.125.24 0 1

hostcdrhost1-oam 101.123.126.28 0 1

hostcdrapp1-oam 101.123.126.38 0 0

hostfwmgmtsw 101.123.125.27 0 0

[user@hostfwnms1-oam tmp]#

Tuesday, January 26, 2021

Unix Scripting : extract value at Nth line after string

To extract the Nth line after a matching pattern you want:

awk 'c&&!--c;/pattern/{c=N}' file

sample use in script

#! /bin/sh
# check pid for OrderManagement 
PID=`ps -ef | grep Order | grep OrderManagement| awk '{print $2}'`
if [ -z "$PID" ]
then
# return 0 if PID does not exist
echo 0
else
# If PID exist ,test if jmap okay
if jmap -heap $PID > /dev/null 2>&1
then
echo pid is $PID
#run jmap -heap PID
/usr/bin/jmap -heap $PID | awk 'c&&!--c;/G1 Heap/{c=5}' | awk -F% '{print $1}' | cut -d. -f1 | sed 's/ //g'
else 
# return 0 if jmap command fails
echo 0
fi
fi

Tuesday, November 24, 2020

Unix/Linux Script how to print time 1 hour 2 hours ago

$ cat testtime.sh

#!/bin/sh

###################### sample ###########################

#getdatenow=`date +%Y/%m/%d" "%H`

#getdate1hago=`date --date="1 hour ago" +%Y/%m/%d" "%H`

#getdate2hago=`date --date="2 hour ago" +%Y/%m/%d" "%H`

#getdate3hago=`date --date="3 hour ago" +%Y/%m/%d" "%H`

#########################################################

# for 0 hour, 1 hour, 2 hours .. ago

#########################################################

for i in 0 1 2 3 4 5

echo $i

datehour=`date --date="$i hour ago" +%Y/%m/%d" "%H`

echo $datehour

done

$ vi testtime.sh

$ sh testtime.sh

2020/11/24 11

2020/11/24 10

2020/11/24 09

2020/11/24 08

2020/11/24 07

2020/11/24 06

$ date

Tue Nov 24 11:56:11 WIB 2020

Unix/Linux Scripts to check daily logfile status

# This is to check dump files are completed for last cronjob

DATE=`date --date="1 days ago" +"%d%m%Y"`

cd /var/DUMPDir

dump1date1=`ls -l --time-style='+%d%m%Y' dump_file1.csv| awk '{print $6}'`

dump1date2=`ls -l --time-style='+%d%m%Y' dump_file2.csv| awk '{print $6}'`

dump1date3=`ls -l --time-style='+%d%m%Y' dump_file3.csv| awk '{print $6}'`

dump1date4=`ls -l --time-style='+%d%m%Y' dump_file4.csv| awk '{print $6}'`

dump1date5=`ls -l --time-style='+%d%m%Y' dump_file5.csv| awk '{print $6}'`

dump1date6=`ls -l --time-style='+%d%m%Y' dump_file6.csv| awk '{print $6}'`

dump1date7=`ls -l --time-style='+%d%m%Y' dump_file7.csv| awk '{print $6}'`

dump1date8=`ls -l --time-style='+%d%m%Y' dump_file8.csv| awk '{print $6}'`

dump1date9=`ls -l --time-style='+%d%m%Y' dump_file9.csv| awk '{print $6}'`

echo "=============================dump files========================"

echo "Checking DUMP files for $DATE"

if [ "$dump1date1" == "$DATE" -a "$dump1date2" == "$DATE" -a "$dump1date3" == "$DATE" -a "$dump1date4" == "$DATE" -a "$dump1date5" == "$DATE" -a "$dump1date6" == "$DATE" -a "$dump1date7" == "$DATE" -a "$dump1date8" == "$DATE" -a "$dump1date9" == "$DATE" ]

then

echo $DATE > /home/user/DUMP_date.txt

echo "dump files date is current $DATE"

echo "Dump : 1 / 1"

else

LAST_SUC_RUN=`cat /home/user/DUMP_date.txt`

echo "dump files date is not current, last successful run: $LAST_SUC_RUN"

echo "Dump : 0 / 1"

Monday, November 23, 2020

Unix/linux how to configure SSH proxy

Let say, server A B C

Server A cannot SSH to C directly

but B can SSH to C(192.168.66.29)

A can SSH to B(192.168.68.90)

Below are the setting

A .ssh]$ ls

config id_rsa id_rsa.pub known_hosts

A .ssh]$ cat id_rsa.pub

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDTGmoWURAB7OGw7T+r8stLraf5j8FdHNgE4SdVM0L8Zop6AIKcFhMa2suOeKzx+B4VXH54DT5vmV2X9iUrWQRqTODz5XaXX3Ck4VPnKawyOra8aLmqEfTS2Q4auKkb0rzXoEjNCu7YDttYjkiUpn/dZ2yw5TfXaKJrnIBqrFuxBh6sLHaYcRI+jzPPik1HIBnSv2rLVBtI6yF7mXom7stRt7dVe1CWvMCLLCalJMtgy+bx4wLbr61moAmSD0j/GTQWuek7/2fqpMEIMl4Y57B4T6sTSSsCJRs5SFxVQu/l908UjWTOhpjToJzltkmJNA2IovyoIBAwSFLabwb9+6PH useid@A

A .ssh]$

1- Update .ssh/authorized_keys on user1@192.168.68.80 with id_rsa.pub per above on hostA n B

2- Update .ssh/authorized_keys on user2@192.168.66.29

3- Update per below on A

A ~]$ ls -l /home/openet/.ssh/config

-rwx------ 1 user2 user2 80 Sep 26 13:46 /home/user2/.ssh/config

A ]$ cat /home/openet/.ssh/config

Host 192.168.66.29

ProxyCommand ssh -l user1 192.168.68.90 exec nc %h %p

A }$

Unix/Linux mailx send email via relay

192.168.1.1 is the ip of mail relay (example)

$ mailx -v -s "testing" -S smtp=smtp://192.168.1.1 -S from="test@yourdomain.com"

OPENNMS How to test polling manually

OPENNMS how to test snmp port ok

# ssh -p 8101 admin@localhost

Password authentication

Password:

____ _ _ __ __ _____

/ __ \ | \ | | \/ |/ ____|

| | | |_ __ ___ _ __ | \| | \ / | (___

| | | | '_ \ / _ \ '_ \| . ` | |\/| |\___ \

| |__| | |_) | __/ | | | |\ | | | |____) |

\____/| .__/ \___|_| |_|_| \_|_| |_|_____/

| |

|_|

OpenNMS (21.0.3) on Apache Karaf (4.1.2)

Hit '<tab>' for a list of available commands

and '[cmd] --help' for help on a specific command.

Hit '<ctrl-d>' to exit this console.

admin@opennms()> poll org.opennms.netmgt.poller.monitors.SnmpMonitor 192.168.70.10

...

Service is Down on 192.168.70.10 using org.opennms.netmgt.poller.monitors.SnmpMonitor

Reason: SNMP poll failed, addr=192.168.70.10 oid=.1.3.6.1.2.1.1.2.0

admin@opennms()> poll org.opennms.netmgt.poller.monitors.SnmpMonitor 192.168.70.10

Service is Up on 192.168.70.10 using org.opennms.netmgt.poller.monitors.SnmpMonitor:

response-time: 0.9282

admin@opennms()> poll org.opennms.netmgt.poller.monitors.SnmpMonitor 192.168.70.14

Service is Up on 192.168.70.14 using org.opennms.netmgt.poller.monitors.SnmpMonitor:

response-time: 1.1582

admin@opennms()> poll org.opennms.netmgt.poller.monitors.SnmpMonitor 192.168.70.15

Service is Up on 192.168.70.15 using org.opennms.netmgt.poller.monitors.SnmpMonitor:

response-time: 1.3335

admin@opennms()> poll org.opennms.netmgt.poller.monitors.SnmpMonitor 192.168.70.15

Service is Up on 192.168.70.15 using org.opennms.netmgt.poller.monitors.SnmpMonitor:

response-time: 1.0122

admin@opennms()> Connection to localhost closed by remote host.

Connection to localhost closed.

# Connection closing...Socket close.