erro de script de shell de verificação de replicação

Question

Estou tentando criar um script de verificação de replicação de banco de dados que verifique a replicação mestre-mestre, mas estou recebendo um erro ao executá-lo.

Aqui está o script

#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
export PATH

#Server Name
Server="Test Server"

#My Sql Username and Password
User=username
Password="password"

#Maximum Slave Time Delay
Delay="60"

#File Path to store error and email the same
Log_File=/tmp/replicationcheck.txt

#Email Settings
Subject="$Server Replication Error"
Sender_Name=TestServer
Recipients="[email protected]"

#Mail Alert Function
mailalert(){
sendmail -F $Sender_Name -it <<END_MESSAGE
To: $Recipients
Subject: $Subject

$Message_Replication_Error

'/bin/cat $Log_File'

END_MESSAGE
}

#Show Slave Status (Line I have edited later.)
Show_Slave_Status=$(echo "show slave status \G;" | mysql -u $User -p$Password) 

#Getting list of queries in mysql
$Show_Slave_Status | grep "Last_" > $Log_File

#Check if slave running
$Show_Slave_Status | grep "Slave_IO_Running: No"
if [ "$?" -eq "0" ]; then
Message_Replication_Error="$Server Replication error please check. The Slave_IO_Running state is No."
mailalert
exit 1
else
    $Show_Slave_Status | grep "Slave_IO_Running: Connecting"
    if [ "$?" -eq "0" ]; then
    Message_Replication_Error="$Server Replication error please check. The Slave_IO_Running state is Connecting."
    mailalert
    exit 1
    fi
fi

#Check if replication delayed
Seconds_Behind_Master=$Show_Slave_Status | grep "Seconds_Behind_Master" | awk -F": " {' print $2 '}
if [ "$Seconds_Behind_Master" -ge "$Delay" ]; then
Message_Replication_Error="Replication Delayed by $Seconds_Behind_Master."
mailalert
else
    if [ "$Seconds_Behind_Master" = "NULL" ]; then
    Message_Replication_Error="$Server Replication error please check. The Seconds_Behind_Master state is NULL."
    mailalert
    fi
fi

Esta é a mensagem de erro que estou recebendo.

tarun@devenv:~/Desktop$ sh databasereplicationcheck.sh 
databasereplicationcheck.sh: 40: databasereplicationcheck.sh: 60: not found
databasereplicationcheck.sh: 43: databasereplicationcheck.sh: 60: not found
databasereplicationcheck.sh: 49: databasereplicationcheck.sh: 60: not found
databasereplicationcheck.sh: 59: [: Illegal number: 

Por favor, ajude.

    

Answer 1

O código echo "show slave status \G;" | mysql -u $User -p$Password 2>& na linha 37 retorna um erro e não vemos esse erro, portanto, você deve imprimir a variável $Show_Slave_Status em caso de falha:

#Show Slave Status
Show_Slave_Status='echo "show slave status \G;" | mysql -u $User -p$Password 2>&1'
status=$?
if [ $status -ne 0 ]; then
  echo $Show_Slave_Status
  exit $status
fi

E, em seguida, execute o script novamente. Agora deve imprimir a mensagem de erro do comando mysql e sair.

E adicione às linhas 40, 43 e 49 echo antes do $Show_Slave_Status variable :

Linha 40: echo $Show_Slave_Status | grep "Last_" > $Log_File

Linha 43: echo $Show_Slave_Status | grep "Slave_IO_Running: No"

Linha 49: echo $Show_Slave_Status | grep "Slave_IO_Running: Connecting"