shell script - check mongod server is running

Question

I have a shell script to do some mongo db actions:

e.g. mongo testdb --eval \"db.dropDatabase()\"

BUT, if the mongod server is not running, I get:

Answer 1

try running this in your shell script:-

pgrep mongod

If the value is numeric you know that the process is running, if you get an empty value, flag it as service not running...

Answer 2

this is what i run to check if mongod is up:

# this script checks if the mongod is running.
# if not, send mail
#

EMAILIST=dba@wherever



`ps -A | grep -q '[m]ongod'`

if [ "$?" -eq "0" ]; then
    exit 0
else
    echo "The mongod server SB2MDB01 is DOWN" | mailx \
    -s "Server DOWN: SB2MDB01" $EMAILIST
fi

exit 0

Answer 3

You should be able to create a bash script like this:

mongo --eval "db.stats()"  # do a simple harmless command of some sort

RESULT=$?   # returns 0 if mongo eval succeeds

if [ $RESULT -ne 0 ]; then
    echo "mongodb not running"
    exit 1
else
    echo "mongodb running!"
fi

Answer 4

If you have administrative rights, you could also do a sudo systemctl status mongod which gives you lots of helpful additional information:

mongod.service - MongoDB Database Server
   Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2019-03-14 09:26:53 UTC; 5 weeks 9 days ago
     Docs: https://docs.mongodb.org/manual
 Main PID: 420 (mongod)
   CGroup: /system.slice/mongod.service
           └─420 /usr/bin/mongod --config /etc/mongod.conf