I've been pretty vocal recently over my move to Amazon EC2 and switching to LEMP stack and then switch to a LEPP stack.� This has certainly seen some great improvements in speed, traffic, and Google indexing.� Unfortunately as many of you may know who run their own dedicated server, it's not all white sandy beaches and beautiful sunsets!� When something goes wrong, it's up to you to fix it.
So far the only issue that I see keep cropping up is my Mysql database seems to crash every several days.� From what I can see, it appears to be a lack of memory issue � it appears my EC2 server is just shy on a bit of memory.
At this point, I don't think it's worth upgrading; instead I've built a simple Mysql uptime script that will ensure it's always running for me.
This code returns me a message indicating the status of the Mysql server.� Since I'm not running the largest traffic sites in the world, I've taken this simple command and created a script around it, that if it doesn't return the message "mysqld is alive" I restart the mysql daemon inside of a shell script.
Please note: I'm not certain that this is the best approach, but it certainly is serving my purposes right now.
Here is the full script below; it includes emailing me as well so I can keep track of how often this is happening.
Once I finished creating this script, I also added a cronjob that will run every 5 minutes executing this command:
This is my simple 5 minute solution to this problem, is there a better way to do this? Published on Oct 1, 2012 Tags: SQL Tutorials for Beginners, Intermediate and Advanced Users
| Theory
| crontab
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�Mysql server provides a nice tool called mysqladmin.� By executing the following command:
mysqladmin ping
#!/bin/bash
result=`/usr/bin/mysqladmin ping`
expected='mysqld is alive'
if [[ "$result" != "$expected" ]]
then
echo "It's dead - restart mysql"
# email subject
SUBJECT="[MYSQL ERROR] - Attempting to restart service"
# Email To ?
EMAIL="[email protected]"
# Email text/message
EMAILMESSAGE="/tmp/emailmessage.txt"
echo "$result was received"> $EMAILMESSAGE
echo "when we were expected $expected" >>$EMAILMESSAGE
# send an email using /bin/mail
mail -s "$SUBJECT" "$EMAIL" < $EMAILMESSAGE
sudo /etc/init.d/mysql restart
fi
*/5 * * * * /<path_to>/scripts/mysql.sh
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