Website crashing ever since xenforo install. Possible causes?

andrewkm

andrewkm

Active member
Ever since we installed xenforo we have had some serious issues with our site hanging completely until a vm restart is done.

Previous issue thread:http://xenforo.com/community/threads/website-issues-session-table-problems.39022/#post-430754
Increased tmp partition -> 2GB
If you have any information regarding above thread please let me know.

Anyways onto this problem. Regarding server hanging untill a vm restart is done; and all is well again.
While it was hanging a noticed this in ram usage: http://i.imgur.com/SHr8m.png

After a VM reboot all was well; website was once again up and working as it should (Untill next time - happens once a day-two)

After reboot ram usage: http://i.imgur.com/OpMdS.png

Also noticed this after reboot when checking xenforo logs:
http://i.imgur.com/f6GQW.png
(im assuming its something to do with the mysql connections loses since thats when site started to go down) - Unless the other errors have something to do with it; please shed some light on this topic.

Really needing help :) Thanks for any and all responses.
Info regarding VPS if needed:
(2GB ram, 25GB storage, 2vcpus, only xenforo and a media wiki is on the vm nothing more)
 
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You must have a misconfiguration of MySQL that causes to crash your vm. I recommend you to optimize the MySQL setup, increase the number of open files if needed before accusing XenForo ;)
 
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How many memory have you given to Mysql? It's probably the best to post your My.cnf file...

Maybe Mysql is eating up all RAM until the VM is killed?
 
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Insy said:
You must have a misconfiguration of MySQL that causes to crash your vm. I recommend you to optimize the MySQL setup, increase the number of open files if needed before accusing XenForo ;)
Click to expand...
Not accusing; just highly confused and new to xen :( (Sorry) - Thanks for the advice I shall look into it; anywhere you recommend starting regarding options to change?
 
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Walter said:
How many memory have you given to Mysql? It's probably the best to post your My.cnf file...

Maybe Mysql is eating up all RAM until the VM is killed?
Click to expand...
[mysqld]
set-variable = max_connections=500
log-slow-queries
safe-show-database

query_cache_type=1
query_cache_limit=1M
query_cache_size=256M
key_buffer_size=256M
thread_cache_size=6
table_cache=1024
tmp_table_size=64M
max_heap_table_size=64M
 
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Exactly as I thought. Mysql will use more RAM than you have in your VM :)

First thing to do is to reduce the max_connections now. I highly doubt you really need 500 connections. A Mysql connection is not the same as a user online :)
For a normal forum 100 should be enough for a long time.

Next thing is to enable Innodb caching, this will make your forum a lot faster :)
Just add

innodb_buffer_pool_size=100M

This will add 100MB buffer for Innodb.
 
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Walter said:
Exactly as I thought. Mysql will use more RAM than you have in your VM :)

First thing to do is to reduce the max_connections now. I highly doubt you really need 500 connections. A Mysql connection is not the same as a user online :)
For a normal forum 100 should be enough for a long time.

Next thing is to enable Innodb caching, this will make your forum a lot faster :)
Just add

innodb_buffer_pool_size=100M

This will add 100MB buffer for Innodb.
Click to expand...
Thanks for all the wonderful advice :) Applying all these changes now.
Also in the report I see it asks me to run OPTIMIZE TABLE -> should I do this through phpmyadmin on the entire xen database? Would it be safe to do so?
 
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andrewkm said:
Thanks for all the wonderful advice :) Applying all these changes now.
Click to expand...

Report back the outcome. But should help tremendously.

andrewkm said:
Also in the report I see it asks me to run OPTIMIZE TABLE -> should I do this through phpmyadmin on the entire xen database? Would it be safe to do so?
Click to expand...

Thats a good idea from time to time but not urgently needed. And before you optimize the tables, I highly recommend a) closing the forum and b) making a backup of the complete database.
 
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Walter said:
Report back the outcome. But should help tremendously.



Thats a good idea from time to time but not urgently needed. And before you optimize the tables, I highly recommend a) closing the forum and b) making a backup of the complete database.
Click to expand...
Alright ran optimize; looks like all went fine.
I will report back in this thread if crashing/etc continues :)
 
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Walter said:
Report back the outcome. But should help tremendously.



Thats a good idea from time to time but not urgently needed. And before you optimize the tables, I highly recommend a) closing the forum and b) making a backup of the complete database.
Click to expand...
Hey walter have a question for you.
My WHM has an option to upgrade mysql from 5.1 to 5.5
Would doing so be safe/unsafe for xenforo? (I have heard great things regarding performance and mysql 5.5 when compared to 5.1)
* Of course I shall do full backups before doing so.
 
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andrewkm said:
Would doing so be safe/unsafe for xenforo? (I have heard great things regarding performance and mysql 5.5 when compared to 5.1)
Click to expand...
I use XenForo with MySQL 5.5 and CPanel with no issue. But this does not dispense yourself to optimize your MySQL configuration once upgraded ;)
 
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