PHP, Mysql, Xml Etc
Aug 29, 2007
started programming for web about a year ago (PHP, mysql, xml etc ) and am completely addicted. Having no prior experience in computing and have been hosting sites on shared server packages. I would, tentatively, like to start hosting my sites on a dedicated servers as i have now realised that it gives you more control over things like security, php / mysql extensions and config files.
I thought i'd start the process on a vps first and make some mistakes there, as i know it can get pricey with dedicated server. A friend reckoned that i should start with Ubuntu on linux (i have no experience with linux, but would like to get involved).
First of all does anyone now any good, cheap vps providers (i've looked at vpsland, feedback? better alternatives?)
and also, can you guys recommend good books/resources that will get me started with server administration (idiots guide!!) or just any good hints to get going! Should i set up on a web server on own pc first or jump in on a vps?
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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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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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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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Feb 25, 2008
i've been using 4.1 without problems but now i'm switching servers and i am wondering whether its a good idea to go for ver 5. How do they compare in terms of performance/security etc? Whats recommended for web use?
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Sep 13, 2008
My Server using more MYSQL and CPU
i checked every thing
1 ) i went to : Show MySQL Processes
i want to know what is NULL
root localhost NULL Query 0 NULL SHOW PROCESSLIST
2 ) i went to CPU/Memory/MySQL Usage
Top Process %CPU 122 gzip
Top Process %CPU 110 gzip
Top Process %CPU 89.0 gzip
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Jul 18, 2008
Would enabling PDO and PDO Mysql modules in apache compile (via whm) be a bad idea? Any possible conflicts or warnings?
It says
(UNSUPPORTED EXPERIMENTAL) Includes SQLite support. Other drivers (freetds, oracle, etc) can be installed with PECL. If you use rawopts to add them during compile then you will have to have them '=shared' and *NOT* do the PHP "versioning" option. Custom opt mods for PDO extensions should also do the "versioning" logic this one does.
I'm already using mysql 5 with mysqli
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Dec 18, 2007
I have successfully upgraded PHP 4.3.9 to PHP 5.1.6 and MySQL 4.1.20 to 5.0.48 and everything appears to working properly. Couple of questions:
1. Will the databases that were created under 4.3.9 automatically work under 5.0.48? Or do I need to do anything to them?
2. The database information appears to be fine under phpMyAdmin, but I noticed a new database file is now showing. It is named "information_schema". What is this file and is it a new part of MySQL 5.0.48?
3. Does phpMyAdmin 2.6.3 work fine with MySQL 5.0.48? Or do I need to upgrade that as well? And if so, what version works with 5.0.48?
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Dec 20, 2007
A table in my DB got crashed and I repair it via phpmyadmin it gives me status that its repaired but when I browse it, it says table is marked crashed.
I've tried repairing several times,
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Feb 15, 2007
I have a server with 3 gb ram and currently 2 gb ram is free on my machine but the cpu is always 90 usually everytime
what can I do to use more ram toward mysql and less cpu
what can i adjust in my.cnf to lower cpu usage by mysql?
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Mar 16, 2007
one of our servers is memory usage is very high and hard to track it down.
[]# mysqladmin pr
+-------+------+-----------+----+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-------+------+-----------+----+---------+------+-------+------------------+
| 29045 | root | localhost | | Query | 0 | | show processlist |
+-------+------+-----------+----+---------+------+-------+------------------+
Loook at the memory usage.
]# free -m
total used free shared buffers cached
Mem: 1003 988 14 0 20 85
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1262 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:03.83 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1263 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:00.00 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1264 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:10.37 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1269 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:25.82 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1339 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:36.99 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1344 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:26.47 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1349 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:41.44 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1397 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:27.28 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1398 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:27.71 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1401 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:37.15 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1403 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:20.32 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1410 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:23.28 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1411 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:17.13 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1412 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:16.82 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1413 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:25.30 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
1449 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:31.98 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
11205 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:21.92 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
11219 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:32.17 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
10073 mysql 15 0 290m 51m 1848 S 0.0 5.2 0:09.14 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
10074 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:19.78 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
10075 mysql 16 0 290m 51m 1848 S 0.0 5.2 0:23.84 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/fas
22902 slackers 16 0 30420 20m 2028 S 0.0 2.1 0:23.25 spamd child
how to track it down?
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Nov 22, 2007
I have a medium size forum with around 100 members online in 15minutes.. as the days gone .. sql data has become quite big .. and now most of the times mysql uses 100% ... any help regarding this .. how to optimise sql .. or may be RAM upgrade needed ?? i already have 3GB ram with xeon 3010 processor
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Aug 16, 2007
Suddenly all sites on my servers show this error when access them(sites with db)
Could not connect: Client does not support authentication protocol requested by server; consider upgrading MySQL client
I try to google this error but seem all instructions do not help much as i can not update every user 's password on server.
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Jul 11, 2007
my server stil down I cant login to the SSH .I reboot my server 3 time in the day ? I dont now what is the problem?
there is result of command top
PHP Code:
Tasks: 206 total, 1 running, 204 sleeping, 0 stopped, 1 zombieCpu(s): 95.7% us, 3.3% sy, 0.0% ni, 0.0% id, 0.0% wa, 0.3% hi, 0.7% siMem: 506732k total, 501156k used, 5576k free, 1404k buffersSwap: 522104k total, 323436k used, 198668k free, 88132k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1962 mysql 15 0 402m 34m 3456 S 75.5 7.0 6:57.25 mysqld 8388 apache 15 0 32304 10m 3872 S 7.6 2.1 0:00.62 httpd 4489 root 18 0 1784 532 204 S 6.6 0.1 0:50.46 gzip 7810 apache 16 0 31696 9.8m 3844 S 4.0 2.0 0:00.22 httpd 4487 root 18 0 15616 2116 1168 D 1.7 0.4 0:13.60 PleskX.pl 4831 root 18 0 16360 3496 1184 S 1.3 0.7 0:10.99 PleskX.pl
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