Connection To MySQL Hangs 2-3 Times/hour
Jan 10, 2007
I just got a new server and discoverd very strange problem. It happends 2-3 times every hour. When I try to access some webpage which connects to MySQL, I get page header and then page hangs for some 1 minute. After some 1 minute everything is back to normal. I can open several windows with different websites hosted on my server and the same problem is in all windows. At the same time I can access al websites without MySQL connections.
I have Fedora Core5
MySQL version 5.0.27
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Sep 5, 2007
What is a good setting per user:
MAX_QUERIES_PER_HOUR count
MAX_UPDATES_PER_HOUR count
MAX_CONNECTIONS_PER_HOUR count
to avoid users hogging MYSQL 4.1
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Jul 21, 2008
How would I go about backing up MySQL databases every hour or 2?
I think I read somewhere you shouldn't do a direct rsync as the tables would not be locked or something like that.
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May 10, 2008
I am facing an very typical problem, when I start apache and mysql both my site works good for half and hour or so then start getting slower and slower to load and after sometime becomes completely inactive. Then i have to restart both mysql and apache to get my site back.
When sites became inactive I have to restart only apache to see it back.Restarting only mysql dont help at that time.
Apache runs without any problem when running alone .(mysql stoped.)
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Jan 10, 2008
in one of our dedicated servers, when we go to WHM/Service Status / CPU Memory MySQL usage.. http server and MySQL process appears all 3 times...
is that normal?
i attach an email to be more clear.
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Jun 8, 2007
I have a database server – mysql.xx.com which is the main MySQL server in H-Sphere.
I've created a database from mysqladmin interface.
I can use the database without a problem but when I’m trying to access the database from another server that I’ve just installed, the PHP application says that it can not connect to the database.
Another thing is that if I move the php app with the same configuration file under a shared account under another H-Sphere server, it's working perfectly.
I’ve read the H-Sphere documentation about an option to enable remote access to the mysql server which I can’t find anymore under our H-Sphere 2.5 Patch 8.
I’ve done a lot of searching to see how can I make that PHP application to connect to mysql.xx.com but it seems that although I’ve run the command grant all …. Command for that database, it still doesn’t work.
One final thing – from that new server if I run "mysql –h mysql.xx.com –u user –p" I can connect to the database and do a use database, show tables etc.
From iptables on mysql.xx.com I see that it accepts connections from outside.
This issue of not getting that PHP application to connect to mysql.xx.com can be related to the fact that H-Sphere is using the server or what should I try further?
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Oct 1, 2009
I'm trying to diagnose where my problem is coming from.
I have a site hosted with Integra Telecom. The site is connecting remotely to a MySQL database hosted on Media Temple.
My problem is that the site's connection to the MySQL database seems to be fluctuating throughout the day. Sometimes the site is up, sometimes it's down.
When it was down, I got the error: "Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)"
So is the problem with Integra Telecom or is my problem with Media Temple?
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Nov 3, 2009
Currently mysql.max_persistent and mysql.max_links are set to -1 which means unlimited
to optimize mysql, should i keep this unlimited or is it good to limit this? If i have to limit it, what is the best value that I can put there?
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Jul 15, 2008
I have win2003 server and running plesk 8.4, there is a website on it and it gives me error with mysql max_connection even I set the limit 1 million or 10000 no matters.
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Mar 18, 2008
We have a front end server for the website Zymic.com (a free web hosting community), a mysql server and a main server for hosted websites. The problem lies between establishing a connection from the Zymic.com server to the database server - to sum it up, the connection just "hangs". We have never had this problem before, never edited anything which would cause a problem, its completely spontaneous.
My administrator has spent endless hours trying to debug the problem, here are some notes he gave me:
1. Ping to the mysql machine works fine.
2. Telnet to port 3306 of the mysql machine works great too – meaning NOT a network issue.
3. Strace on the connection shows it hangs when it calls the server and waits endlessly for response.
4. The mysql machine listens to the IP and port 3306 and connects great to the hosting server via SSH.
5. It's NOT a max connection issue but something to do with the mysql socket itself.
Here is a test from another site on the server to the mysql server:
[url]
Code:
<?php
mysql_connect('75.126.138.74', 'wkscript', 'PASSWORD') or die(mysql_error());
mysql_select_db('domains_data') or die('SELECT ERROR : ' . mysql_error());
?>
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Dec 21, 2008
I have setup LiteSpeed and I have got a problem with php and mysql.
It seems php can't connect to mysql. At every script which use mysql(like phpbb3, phpbb2 etc) I getting errors
SQL ERROR [ mysql4 ] Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) [2002]
phpBB : Critical Error
Could not connect to the database
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Dec 7, 2007
MySQL Error : Lost connection to MySQL server during query
I get this error around 10 times a day and the MySQL server goes down
Here are my.cnf contents
Quote:
[mysqld]
safe-show-database
old_passwords
back_log = 75
skip-innodb
max_connections = 650
key_buffer = 48M
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 1M
sort_buffer_size = 2M
table_cache = 3000
thread_cache_size = 128
wait_timeout = 90
connect_timeout = 10
tmp_table_size = 64M
max_heap_table_size = 64M
max_allowed_packet = 64M
net_buffer_length = 16384
max_connect_errors = 10
thread_concurrency = 4
read_rnd_buffer_size = 786432
bulk_insert_buffer_size = 8M
query_cache_limit = 3M
query_cache_size = 48M
query_cache_type = 1
query_prealloc_size = 262144
query_alloc_block_size = 65536
transaction_alloc_block_size = 8192
transaction_prealloc_size = 4096
default-storage-engine = MyISAM
[mysqld_safe]
nice = -5
open_files_limit = 8192
[mysqldump]
quick
max_allowed_packet = 16M
[myisamchk]
key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M
[mysqlhotcopy]
interactive-timeout
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May 31, 2009
What is the standard number on maximum mysql connection on most shared host providers and which one give the highest number.
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May 13, 2009
I bought a VPS to run a part of a application I have and it needs to connect to my database in cpanel. I have set everything up properly and allowed the remote server to connect to my server, I updated the DB connect file with the correct mysql server username and password. But when I try and run the script I get this error.
Quote:
Client does not support authentication protocol requested by server; consider upgrading MySQL client in
I'm not 100% sure what to do. I don't understand why it wouldn't work because it works perfectly on the main server with my scripts. But I get that error message on the remote server.
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Feb 21, 2008
I have developed a desktop system that uses MySQL data.
I want to use a host to access the data but my current provider only allows access to MySQL data via a web server.
Can anyone suggest a host that would provide direct connection to a MySQL database?
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Aug 15, 2008
how to allow user to remote mysql connection from his localhost ( in linux server with WHM )
my user wants to connect to the mysql from his localhost
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Aug 12, 2007
some vBulletin customers facing to that error message, with session table with attachment only. Other just work fine. It's not because of server load. The load is just around 0 - 0.1
I have increased wait_timeout to 200 and max_allowed_packet to 64MB. Each attachment file in those vBulletin is just around 1-3MB.
Is there any idea why and how to fix?
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Jun 29, 2009
A have set up a cpanel with remote mysql server.
My demo config:
cpanel:
centos VPS with cpanel WHM (demo)
mysql:
debian VPS
the configuration is OK, it works.
We have got 200 customers, and we will to change to cpanel.
The MYSQL server is on a solaris zone. It is possible to make the remote connecting with it. I will import the 200 users MYSQL databases to cpanel, with privileges (user settings). The mail/web dir a will import manuali to cpanel server(copy-paste-setuser:group).
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Aug 8, 2008
I have 2 identical Fedora8 boxes with Apache 2.2.8, MySQL 5.0.45 and PhP 5.2.4. I use one as the Web+DB server (say box A), and the other (box B) just as the Web server connecting to the DB server on box A. I use this 2 machine configuration to test a LAMP based-Web application. I have a client program on other machines that can emulate a massive web workload to these 2 servers; it can emulate hundreds to thousands of users using the application simultaneously.
Before running the test, the connection to the DB server from both boxes seem fine. Using the mysql client program on either box A or B trying to connect to the DB, the connection goes through instantly. In the /etc/my.cnf file, I have max_connections=4096 and max_user_connections=4096. Note that the web app uses one single db user to connect to the db. To allow remote connection, I inserted one record into the user table of the mysql db whose the host field's value is '%' (allow connection from all remote hosts).
After running the test (which I found out that many requests sent to box B failed), mysql client program on box A is still able to connect to the db instantly; but the one on box B has a problem: it takes extremely long (5 - 10 minutes or even more) to establish the connection, it doesn't time out, just takes that long. I believe that's the cause for the failure of requests to box B.
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Jan 27, 2008
The main function of my dedicated server is the vBulletin forum that we run.
Ever since I had bastille firewall installed and configured on my server we have been getting regular vBulletin errors.
Everything runs pretty smoothly most of the time, we can carry lots of connections without any issues, server has plenty of free RAM and CPU is never overloaded even during peak hours. I have been told bastille firewall (iptables) is configured correctly, all ports that need to be open are open.
But about twice per day we have a MySQL "disconnect" that lasts about 30-60 seconds per incident. For example we will start getting the following message via e-mail, and it will amount to 20-30 e-mails like this during the 30-60 second incident. After that, the e-mails and problems will go away, until next time.
vBulletin Database Error!
mysql_connect(): Can't connect to MySQL server on 'sql.datacolony.com' (4)
/hsphere/local/home/site/site.com/forum/includes/class_core.php on line 274
MySQL Error :
Error Number :
Date : Saturday, January 26th 2008 @ 07:53:05 PM
Script : [url]
Referrer : [url]
IP Address : 92.3.190.54
Username :
Classname : vb_database
The server is running CentOS 4.6, PHP 4.4.7, MySQL 5.0.45. The vBulletin software has been patched to the latest version. The vBulletin people are not sure why this could be happening.
Well we never believed that the firewall was causing the issue BUT it only started happening on the day the new firewall was installed. So we tried stopping the firewall for a full week and the MySQL database errors stopped happening, completely. So I'm convinced the problem is the firewall blocking MySQL connections but I can't figure out why?
There are no entries in the MySQL .err logs pertaining to this. Can't figure this out, any help or ideas is appreciated since the people who installed the firewall are not sure either.
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May 7, 2015
I freshly installed Plesk 12.0 on Ubuntu 14.04. Everything works accept the MySQL database creation.
When I try to create one, i get this error :
error: the test connection to the database server has failed because of network problems: connection refused...
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Oct 7, 2009
I have a dedicated server which I am managing myself. I have experienced a strange thing today. The whole Apache daemon seemed to be hung. Every Web request resulted in a timeout, even when executed from localhost. The CPU usage has been minimal (like 99.7% idle). No MySQL long statements being executed, nothing. mod_status did not help me, because requesting the status also hung (as it is retrieved by HTTP). After Apache restart everything went back to normal.
I have no idea what could have happened, and moreover Apache does not provide me with any tools to diagnose it (because mod_status doesnot work in such situation). So I am asking you for help - do you have any idea what I could do when such problem repeats to diagnose its source?
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May 7, 2008
I have a problem. When MSN Search robot looks through my VPS, the machine is going "asleep", e.g. Apache2 (Port 80) doesn't answer at all. Here is the last falling:
Code:
23:14:15 up 4 days, 9:06, 5 users, load average: 37.18, 31.25, 27.46
I hardly ever can enter 'pkill apache2' to kill Apache2 processes. Here is my Apache2 configuration (timeouts, prefork, e.g.):
Code:
Timeout 30
KeepAlive On
MaxKeepAliveRequests 20
KeepAliveTimeout 5
<IfModule mpm_prefork_module>
StartServers 2
MinSpareServers 2
MaxSpareServers 5
MaxClients 10
MaxRequestsPerChild 400
</IfModule>
Maybe I configured Apache2 wrongly, but I only want to prevent this bad thing.
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Oct 28, 2008
I seem to be having troubles getting yum to run. The problem occurs when I try to run yum via ssh using putty or install perl modules through whm.
When I try to run it, I generally get:
Loading "fastestmirror" plugin
And nothing after that, even if I wait a while. This happens when I run:
yum update
yum install imagemagick (my current reason for trying to get yum to run)
yum clean all
(probably other yum commands)
If I run yum with --noplugins, it just skips putting out the fastestmirror message.
Some info on my system:
CENTOS Enterprise 5.2
Kernel Version: 2.6.18-92.el5
Intel C2D e6750
WHM 11.23.2
cPanel 11.23.6-R27698
I'm not sure what other information be relevant;
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Apr 7, 2008
I have ftp server (pure-ftp). with firewall.
i allowed 20 and 21 port in "CSF" firewall
now when i or our client connect to the server connection done.
and the they fire dir or ls command they will receive error
"425 Could not open data connection to port 2535: Connection timed out"
what is the problem.i have already allowed passive port 2500:3500 then why i received this types of error
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Mar 30, 2008
We have recently launched a new website with a SSL homepage which houses our login. Our website moved to a new IP address, therefor we moved the certificate to the new server as well. Thus far, we have had NO problems with the site with the exception of 2 MAC users who's browser hangs when they try to navigate to the site now. They can access other HTTPS sites, and they can access pages on OUR site that are NOT HTTPS, but when trying to browse to our HTTPS Page, the browser hangs. This is not just ONE browser on their MAC, it's EVERY broswer on their machine (Firefox, IE, Safari). It connects, but then doesn't load anything onto the screen. We tried clearing their DNS cache on their machines with no avail. To this point, we are stumped. We have identical machines, with idential OS and browser versions and everything tests fine. It is obviously something on their machine, but we don't know what it is. We have run out of ideas. Any MAC users that can lend a hand here? Is there a way to delete the certificate on the MAC and have it redownload to the user?
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Feb 19, 2009
problem I was having which was Windows Small Business Server 2003 would hang on boot up. I never got the time to reinstall the server until now.
I have installed the server and applied all updates. This worked fine until I install the Windows Server 2003 Service Pack 1 or 2. When I install SP1 or SP2 on reboot the server loads the Dell splash screen then the monitor LED light goes orange then green then orange and then just hangs with a blank screen.
I can boot into Safe Mode and uninstall the Service Pack and I can then reboot without any problems. I have installed ADAM SP1.
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