MySQL Monitor Shows MySQL As Offline When It's Not
Jan 15, 2007
I've been racking my brains with this problem for the last couple of months and have made zero progress. I've asked a lot of people if they know what might be wrong here, but none of them have any idea.
Basically, the problem is that any sort of service monitor I put on my server shows MySQL as being down/offline, even when I know for sure it's up and running perfectly fine. All other services report a green light.
The mysqld service is running on port 3306, which is open both inbound and outbound on my APF config, so as far as I can tell it's nothing to do with the firewall (I won't rule that out though).
The other odd thing is that MySQL shows a green light within WHM, but not anywhere else.
Does anyone know what might be wrong here? Am I missing something entirely fundamental and obvious?
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Nov 14, 2008
I just upgraded to the latest version of APF. I am running CentOS with the 2.6 kernel.
I added my ports to allow, started it up, and it does not seem to be blocking anything.
I get no errors on startup though. If i do an nmap, mysql shows up as open still. I can even telnet to it.
root@me [~]# /usr/local/sbin/apf -r
apf(6367): {glob} flushing
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Oct 12, 2007
my server is jammed and takes minutes to load simple pages, can you please take a look ath the following image, its show under "CPU %" for mysql 177, does that mean mysql is using 177% of resources of cpu?
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Mar 25, 2008
I have recently upgraded MySQL to 5.25
However, when I run phpinfo, I see the following:
mysql
MySQL Support enabled
Active Persistent Links 0
Active Links 0
Client API version 4.1.21
MYSQL_MODULE_TYPE external
MYSQL_SOCKET /var/lib/mysql/mysql.sock
MYSQL_INCLUDE -I/usr/include/mysql
MYSQL_LIBS -L/usr/lib/mysql -lmysqlclient
mysqli
MysqlI Support enabled
Client API library version 4.1.21
Client API header version 4.1.20
MYSQLI_SOCKET /var/lib/mysql/mysql.sock
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Mar 5, 2008
I've a small reseller account with cPanel with 5 sites. After transfering to other host (full cPanel backup of old sites, restoring on new host) cPanel of 2 sites still displays the version number of the old host, the other 3 sites are correct.
CP1: correct - CP2: wrong
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Mar 23, 2008
Since upgrading to Apache 2 I am no longer able to tell which domains are the busiest using CPU/Memory/MySQL Usage. Now Apache processes are all lumped together and individual domains only show cron, mail and FTP usage. I opened a ticket with cPanel and they know of the problem but there is still no solution. Is there another way I can tell which of my sites is using the most resources until this bug is fixed?
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Jan 18, 2008
I heard of script which checks if httpd , mysql , named etc servies are down and make them up...
it keeps chechking all services after 5 mins
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May 8, 2009
Since my /var partition is full, so I moved /var/lib/mysql to /backup/mysql/.
Seems all the files are copied and I changed my.cnf reboot mysql, but all the web sites using db is not working anymore..
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Jan 21, 2007
I installed the MySQL binary packages in /usr/local/mysql/ after removing the MySQL RPM package. MySQL is functioning when I executed /usr/local/mysql/bin/safe_mysqld. I reinstalled MySQL before I installed PHP. When I used a PHP script to access a MySQL database, it outputs an error:
Code:
Warning: mysqli::mysqli() [function.mysqli-mysqli]: (HY000/2002): can't connect to local mysql server through socket /var/lib/mysql/mysql.sock in index.php on line 2
However, I installed MySQL in /usr/local/mysql, not in /var/lib/mysql. How do I fix MySQL?
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Jun 16, 2008
For some reason mysql wont start, i have tried restarting mysql but it wont, it says FAILED. The mysql.sock file seems to have disappeared and i cannot find it anywhere.
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Feb 11, 2008
I recently had a harddrive failure and luckliy I can still access certain directories on this failed drive. I can still access the /var/lib/mysql/ directory which holds all the users databases and have backed all these up separately using tar.
Now what I need to know is how do you restore these database files to another server? I tried simply untar'ing one of these to the new servers /var/lib/mysql/ direcotry and it stuffed Mysql up - it went offline. I had to get a cpanel tech to bring Mysql back online.
how can I get these database files to fully work on a new server?
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Jan 17, 2008
Can someone recommended me some one with knowledge of mysql exploit or mysql injection, it seem to our VB forum have issue with database load..
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Apr 15, 2009
my /var partition is full,
im not sure if any files i can remove to get more free space on /var partition.
because there are more free space on /home,
i think if i can move all the /var/lib/mysql to /home/mysql,
if yes,howcan i move it and do any change,
can let the sql data do not lose,
andrun well in the feature ?
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Mar 28, 2007
I've rented a dedicated server that comes with Red Hat Enterprise Linux 4 and MySQL 3.23 but I need at least MySQL 4.1 or higher. My knowledge about GNU/Linux is very limited, so I've read some documents at mysql.com and now I think I have to follow these steps:
1. Uninstall MySQL 3.23 with this command line:
shell> rpm -e mysql-*.rpm
2. Install the server and client RPMs of MySQL 5.0:
shell> rpm -i MySQL-server-VERSION.i386.rpm
shell> rpm -i MySQL-client-VERSION.i386.rpm
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Jun 13, 2007
I have a number of web sites on a dedicated server. Some of these web sites are a few years old. Are there any issues upgrading from MySQL 4.1 to 5.x? Are there web sites that may have compatibility issues?
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Dec 18, 2007
I keep getting this error :
MySQL Error : MySQL server has gone away
How do I fix it?
my.cnf contents
Quote:
[mysqld]
safe-show-database
old_passwords
back_log = 75
skip-innodb
max_connections = 800
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 = 30
tmp_table_size = 128M
max_heap_table_size = 64M
max_allowed_packet = 256M
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
max_user_connections = 500
[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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Jun 27, 2009
I have recently upgraded mysql server from 5.0.75 to 5.1.31 on my Ubuntu server 9.04 32 bit. After that when I am running phpmyadmin it is printing a warning :
Your PHP MySQL library version 5.0.75 differs from your MySQL server version 5.1.31.
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Jun 3, 2008
I'm trying to upgrade from MySQL 4 to MySQL 5 for performance reasons. MySQL 4 was working great so I decided to just go ahead and upgrade to MySQL 5 via CPanel. The upgrade appeared to go fine however I now get this error when trying to start MySQL.
/usr/bin/mysqladmin: connect to server at 'localhost' failed error: 'Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)' Check that mysqld is running and that the socket: '/var/lib/mysql/mysql.sock' exists! mysql has failed, please contact the sysadmin (result was "Warning, no valid mysql.sock file found.mysql has failed").
I went ahead and did a forced re-install of MySQL 5, but that didn't help. Apache has been updated as well since then, but that did no good, and the MySQL process isn't starting at all.
Its CENTOS with PHP5.
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Jun 21, 2007
I am not sure what difference between --with-mysql and --with-mysql=/usr to compile php 4.4.7
because I get error message when I use --with-mysql=/usr
the error message is like Mysql header can not be found or similar thing.
it ok when I use --with-mysql
so, I am afraid that can I use php and mysql without problem by using --with-mysql?
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Jan 20, 2007
I'd like to upgrade my current mysql 4.1 version to mysl 5, but i can't find a good tutorial or explenation! I've been searching for hours now without any good results.
I've downloaded the lastest stable mysql 5 .rpm, and tried to install it with rpm -i mysql.version.rpm, but it says the following:
# rpm -i MySQL-server-standard-5.0.27-0.rhel4.i386.rpm
warning: MySQL-server-standard-5.0.27-0.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5
error: Failed dependencies:
MySQL conflicts with mysql-4.1.20-1.RHEL4.1.i386
MySQL-server conflicts with mysql-server-4.1.20-1.RHEL4.1.i386
I guess that means i have to uninstall mysql 4.1 first.
ok...
# rpm -e mysql-server-4.1.20-1.RHEL4.1.i386
warning: /var/log/mysqld.log saved as /var/log/mysqld.log.rpmsave
Let's try to install it now.
# rpm -i MySQL-server-standard-5.0.27-0.rhel4.i386.rpm
warning: MySQL-server-standard-5.0.27-0.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5
error: Failed dependencies:
MySQL conflicts with mysql-4.1.20-1.RHEL4.1.i386
Ok, let's remove that.
# rpm -e mysql-4.1.20-1.RHEL4.1.i386
error: Failed dependencies:
libmysqlclient.so.14 is needed by (installed) perl-DBD-MySQL-2.9004-3.1.i386
libmysqlclient.so.14 is needed by (installed) dovecot-0.99.11-4.EL4.i386
libmysqlclient.so.14 is needed by (installed) php-mysql-4.3.9-3.22.i386
libmysqlclient.so.14(libmysqlclient_14) is needed by (installed) dovecot-0.99.11-4.EL4.i386
libmysqlclient.so.14(libmysqlclient_14) is needed by (installed) php-mysql-4.3.9-3.22.i386
mysql = 4.1.20-1.RHEL4.1 is needed by (installed) mysql-devel-4.1.20-1.RHEL4.1.i386
Does upgrade work?
# rpm -Uvh MySQL-server-standard-5.0.27-0.rhel4.i386.rpm warning: MySQL-server-standard-5.0.27-0.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5
error: Failed dependencies:
libmysqlclient.so.14 is needed by (installed) perl-DBD-MySQL-2.9004-3.1.i386
libmysqlclient.so.14 is needed by (installed) dovecot-0.99.11-4.EL4.i386
libmysqlclient.so.14 is needed by (installed) php-mysql-4.3.9-3.22.i386
libmysqlclient.so.14(libmysqlclient_14) is needed by (installed) dovecot-0.99.11-4.EL4.i386
libmysqlclient.so.14(libmysqlclient_14) is needed by (installed) php-mysql-4.3.9-3.22.i386
Clearly not.
How do i upgrade mysql?
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Feb 16, 2007
I have a big issue importing 4.0 databases with mysql 5.0.27.
I did a mysqldump -pxxxxx --force --all-databases > file.sql on server with mysql 4.0
But when I tried to import the file on server with mysql 5.0, this is what I got:
ERROR 1064 (42000) at line 2: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'database' at line 1
I even tried to force import and I got:
ERROR 1046 (3D000) at line x: No database selected for every database.
I checked sql file and CREATE DATABASE xx and USE xx were both added.
I tried this with a single database and worked but with all not
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Jun 1, 2007
loading a phpinfo() shows that the mysql variable "Client API version" on my server doesn't match the version of mysql installed ( 4.0.20 when mysql version is 4.1.21).
Can this cause trouble and php or mysql errors on scripts i'm running?
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Nov 28, 2008
What are the files in this directory - /var/lib/mysql/
Files like
#sql_2a6c_0.MYD
#sql_2a6c_2.MYD
etc
etc
I have a stack of them all 200MB plus in size
I need to cleanup /var as its 99% full, what else can I clean up?
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Nov 28, 2008
MySQL 5.1 GA
Has anyone tried to migrate already?
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Apr 15, 2008
Mysql usage is very high now and most time server load is high.
Where is issue and how can resolve this?
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Oct 22, 2008
I'm trying to understand, generally, on a Hybrid VPS with 1gig guaranteed/4gig burst- for small sites that might be installing stuff like Wordpress, a Forum, Joomla!, etc., how many MySQL databases this system can support.
I realize traffic would be a major factor but for discussion sake lets assume an average of 50 users for each db with a peak of 100 users.
Just trying to get a 'rule of thumb'. Wondering also, how much RAM (resources?) an idle db consumes.
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