Various simple Sensu checks

httpd.sh

#!/bin/bash

# check if given host returns HTTP status 200
# usage: httpd.sh [host:port]
# ex: httpd localhost:3000

# if no arguments, default to localhost:80
if [ -z "$1" ]
then
    httpd=`curl -s -D - localhost -o /dev/null | sed -n '/HTTP/p'`
else
    httpd=`curl -s -D - $1 -o /dev/null | sed -n '/HTTP/p'`
fi

if [[ "$httpd" == *200* ]]
then
    echo "httpd up"
    exit 0
else
    echo "httpd down"
    exit 2
fi

raid.sh

#!/bin/bash
#template from https://www.thomas-krenn.com/en/wiki/Mdadm_checkarray

# monitor mismatch_cnt (/sys/block/md*/md/mismatch_cnt)
# usage: raid.sh [warning critical]

# if no arguments, defaults to 1 10
if [ -z "$1" ]
then
    WARN_LIMIT=1
else
    WARN_LIMIT=$1
fi

if [ -z "$2" ]
then
    CRIT_LIMIT=10
else
    CRIT_LIMIT=$2
fi

if [ -z $WARN_LIMIT ] || [ -z $CRIT_LIMIT ]
then
    echo "Usage: raid.sh WARNLIMIT CRITLIMIT"
    exit 3;
else
    DATA=-1
    for file in /sys/block/md*/md/mismatch_cnt
    do
        DATA=`cat $file`
        MD_NAME=`echo $file | awk 'BEGIN { FS = "/" } ; { print $4 }'`
        PERF_DATA+="$MD_NAME=`cat $file` "
    done

    if [ $DATA -eq -1 ]
    then
        echo "UNKNOWN - software raid mismatch_cnts not found | $PERF_DATA"
        exit 3;
    fi

    if [ $DATA -lt $WARN_LIMIT ]
    then
        echo "OK - all software raid mismatch_cnts are smaller than $WARN_LIMIT | $PERF_DATA"
        exit 0;
    fi

    if [ $DATA -ge $WARN_LIMIT ] && [ $DATA -lt $CRIT_LIMIT ]
    then
        echo "WARNING - software raid mismatch_cnts are greater or equal than $WARN_LIMIT | $PERF_DATA"
        exit 1;
    fi

    if [ $DATA -ge $CRIT_LIMIT ]
    then
        echo "CRITICAL - software raid mismatch_cnts are greater or equal than $CRIT_LIMIT | $PERF_DATA"
        exit 2;
    fi

    if [ $DATA -eq -1 ]
    then
        echo "UNKNOWN - software raid mismatch_cnts not found | $PERF_DATA"
        exit 3;
    fi
fi

reboot-required.sh

#!/bin/bash

# check if server needs to be restarted

if [ -f /var/run/reboot-required ]
then
    echo "A reboot is needed"
    exit 1
else
    echo "All good!"
    exit 0
fi

service.sh

#!/bin/bash

# check if a given service is running
# usage: service.sh serviceName

service=$1

if [ -z $service ] 
then
    echo "Usage: service.sh serviceName"
    exit 3
fi

# search for line  with "active (running)"
return=`service $service status | grep "active (running)"`

# if nothing is found, var is empty
if [ -z "return" ]
then
    echo "Ooops, $service has stopped"
    exit 2
else
    echo "All good!"
    exit 0
fi

smart.sh

#!/bin/bash

# check if disks pass SMART test

for disk in `lsblk | grep disk | cut -d ' ' -f 1`
do
    status=`smartctl --health /dev/$disk | grep PASSED`
    if [[ -z "$status" ]]
    then
        echo "Disk $disk has a problem"
        diskFailure=true
    fi
done

if [[ $diskFailure = "true" ]]
then
    exit 2
else
    echo All disks ok
    exit 0
fi