MySQL Remote Connection Problem After A Heavy Usage

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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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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Jun 29, 2009

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My demo config:


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Jun 5, 2008

on my top process am having this one as shown in the attachement image

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Oct 27, 2009

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Apr 25, 2008

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Apr 23, 2009

One day, you noticed that someone remotely connectted your computer and an application sends spam/phishing emails bu using your IP. What do you do?

Of course, I stopped the program and blocked remote connection for a while and changed my password... I any way, i have to connect my computer remotely... What do you advice?

By the way, i have more than 1000 email accounts on my computer. Hacker left me a gift, but I don't need them))

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Dec 23, 2008

my site is working fine for somedays and suddenly its stoped and hanged and also my PPP is not working , and file manager in PPP its give me this error
VZAgent returns error #422: "Cannot initialize connection to remote host"
and the suppord admin said I have problem in failcnt

[root@server ~]# cat /proc/user_beancounters
Version: 2.5
uid resource held maxheld barrier limit failcnt
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numtcpsock 141 141 600 600 0
numflock 7 8 300 330 0
numpty 1 1 16 16 0
numsiginfo 0 1 384 384 0
tcpsndbuf 2350036 2625064 32768000 36864000 0
tcprcvbuf 2310144 2129920 32768000 36864000 0
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dcachesize 642510 653661 8192000 8192000 0
numfile 2636 2663 20000 20000 0
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dummy 0 0 0 0 0
dummy 0 0 0 0 0
numiptent 228 228 700 700 0

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Nov 14, 2007

I have a remote XP PC: OpenVPN connection with route added for to go via the VPN

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I have a OpenVPN server inside the lan on
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The trouble is, i can remotely connect and ping to the OpenVPN router fine and also the ethernet router, however when i ping any of the Windows boxes it times out. But i can open up Remote Desktop and connect to the windows box without problem, infact if i am running 'ping -t' it will suddenly come alive but only after the RDP connection is made.

Is this something funny with the routing? I want to keep the OpenVPN server internal to the network and i appreciate it is hitting the ethernet router then being passed to the OpenVPN but something is weird as it fires up RDP fine but not ping. No firewalls are enabled on any of the boxes. If i log into ssh on the OpenVPN router or ethernet router i can ping from that to the windows boxes fine.

Its as if a ICMP redirect is issued, and all is well after the 1st connection. Not too sure but could anyone be kind enough to enlighten me?

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Jun 8, 2007

I have a database server – 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 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 –u user –p" I can connect to the database and do a use database, show tables etc.

From iptables on I see that it accepts connections from outside.

This issue of not getting that PHP application to connect to 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

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Jul 15, 2008

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Mar 18, 2008

We have a front end server for the website (a free web hosting community), a mysql server and a main server for hosted websites. The problem lies between establishing a connection from the 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:

mysql_connect('', '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
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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


back_log = 75
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

nice = -5
open_files_limit = 8192

max_allowed_packet = 16M
key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M


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May 18, 2007

After running for a while mysql suddenly starts using 100% CPU and my site goes down due to apache waiting with 150 sleeping processes.

Here is the top stats

PHP Code:

top - 00:20:47 up 12:01,  2 users,  load average: 1.11, 1.04, 0.95
Tasks: 200 total,   2 running, 198 sleeping,   0 stopped,   0 zombie
Cpu(s):100.0%us,  0.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   1004152k total,   618132k used,   386020k free,   118436k buffers
Swap:  2000084k total,        0k used,  2000084k free,   282372k cached

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14877 root      15   0  2360 1216  860 R  0.3  0.1   0:00.11 top
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ps ax | grep apache -c

On restarting mysql everything goes back to normal.

Can someone tell me how I could go about rectifying this?

I'm sure the server can take the load, coz before this the site was on a way slower machine and worked flawlessly.

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May 11, 2007

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Dec 20, 2007

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What's the best way to monitor mysql usage?


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Tasks: 132 total, 5 running, 127 sleeping, 0 stopped, 0 zombie
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Swap: 2031608k total, 56k used, 2031552k free, 1177200k cached

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May 31, 2009

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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.


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Aug 14, 2008

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here is my my.cnf file. is there anything in their that should be changed to help lower the CPU usage?

# The MySQL server
port= 3306
socket= /var/lib/mysql/mysql.sock
key_buffer = 256M
max_allowed_packet = 1M
table_cache = 512
sort_buffer_size = 2M
read_buffer_size = 2M
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query_cache_size = 32M
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# Remove the next comment character if you are not familiar with SQL

key_buffer = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M

key_buffer = 256M
sort_buffer_size = 256M
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Server Specs.
Pentium E 2.0Ghz
2GB ram
2x 320GB hard drives.
Cent OS 5

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