Retry SFTP Connection In Shell Script

Looking for coding on retry SFTP connection in shell script? You can use this code to enable multiple attempts in case of errors such as network failure or remote server is down.

Our existing shell script hit on different kind of SFTP error and one of it is ssh_exchange_identification: Connection closed by remote host.

Connecting to 127.0.0.1...
ssh_exchange_identification: Connection closed by remote host
Connection closed

This SFTP connection error might caused by the remote server is too busy, thus we need to implement the code to retry the SFTP connection in certain interval.

We used the loopback interface 127.0.0.1 for the testing the retry SFTP connection in shell script.

In this case, we specified the number of retries for SFTP connection failures as 10 and it will reconnect in each 60 second.

The retry SFTP code should be in place before the shell script put or get file from remote server.

At last, change the parameter in retry SFTP code based on your environment.

#!/bin/bash
 
SFTP_USER=username
SFTP_SERVER=127.0.0.1
 
# Ping To Check Remote Server Status
ping $SFTP_SERVER
if [ ${?} -ne 0 ]
then
        echo "Unable to connect to destination server."
        exit 2
fi
 
## Begin - Verify SFTP Connection On Remote Host ##
echo -e "\n"
echo "Begin - Verify SFTP Connection On Remote Host"
 
SFTP_RETRY_COUNT=0
SFTP_RETRY_SECOND=60
 
while [ $SFTP_RETRY_COUNT != 10 ]
do
 
# Establish SFTP To Verify Connection To Staging Server
SFTP_CONNECT=`sftp -o IdentityFile=$HOME/.ssh/$SFTP_USER $SFTP_USER@$SFTP_SERVER 
<< END 2> /tmp/sftp_error.log
quit
END`
 
# Check Log File Exist Before Validation Start
if [ -f /tmp/sftp_error.log ]
then
 
        # Trap SFTP Connection Closed Error
        TRAP_SFTP_ERROR=`cat /tmp/sftp_error.log | grep "Connection closed"`
 
 
        if echo "$TRAP_SFTP_ERROR" | grep "Connection closed"
        then
                echo "SFTP Connection Status: Fail"
                SFTP_RETRY_COUNT=$[$SFTP_RETRY_COUNT+1]
                echo "Retry SFTP Connection -" $SFTP_RETRY_COUNT
                sleep $SFTP_RETRY_SECOND
 
                        if [ $SFTP_RETRY_COUNT == 10 ]
                        then
                                echo "Maximum Retry Reached"
                        fi
 
        else
                echo "SFTP Connection Status: Success"
                SFTP_RETRY_COUNT=10
        fi
 
fi
 
done
 
echo "End - Verify SFTP Connection On Remote Host"
echo -e "\n"
## End - Verify SFTP Connection On Remote Host ##

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Retry SFTP Connection In Shell Script

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