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cd /usr/local/directadmin/data/templates
cp virtual_host2*.conf custom
cd custom

完成后执行更新所有用户

echo "action=rewrite&value=httpd" >> /usr/local/directadmin/data/task.queue

参考来源：http://help.directadmin.com/item.php?id=2

functions.php中添加以下代码

// 移除wordpress顶部工具栏css样式
add_action('get_header', 'remove_admin_login_header');
function remove_admin_login_header() {
remove_action('wp_head','_admin_bar_bump_cb');
}

Our PHP-Selector work wtih DirectAdmin only if PHP is running in suphp or fcgi mode. Here is the complete set of commands to enable selector on DA with suphp :

/usr/local/directadmin/custombuild/build set suphp yes
/usr/local/directadmin/custombuild/build set cloudlinux yes
/usr/local/directadmin/custombuild/build update
/usr/local/directadmin/custombuild/build apache
/usr/local/directadmin/custombuild/build php y
/usr/local/directadmin/custombuild/build suphp
/usr/local/directadmin/custombuild/build rewrite_confs
cagefsctl --force-update
cagefsctl --remount-all

Same way for fcgi mode.

http://kb.cloudlinux.com/2014/12/php-selector-and-directadmin/

当我们启用Suhosin，DA的phpmyadmin会报错，如下：

Server running with Suhosin. Please refer to documentation for possible issues.

是由于权限问题，Suhosin禁止了phpmyadmin部分操作；我们添加例外即可。执行

php -i | grep "Loaded Configuration File"

查看php.ini文件位置，编辑最底下添加

[PATH=/var/www/html/phpMyAdmin]
suhosin.simulation = On

保存后退出重启apache生效即可

在ThinkPHP里面通过自动验证定义来验证数据的长度是否符合要求，在你的模型类里面添加下面的定义即可：

protected $_validate = array(
array('title','5,100','标题长度不符！',3,'length'), // 验证标题长度
array('phone','11','电话长度不符！',3,'length'), // 验证电话号码长度
);

1、关闭DA监控服务

vi /usr/local/directadmin/data/admin/services.status
把exim和dovecot值改为OFF

2、停止服务和禁止开机启动

service exim stop
chkconfig exim off
service dovecot stop
chkconfig dovecots off

3、损坏（重命名）exim目录

mv /usr/sbin/exim /usr/sbin/exim.old

4、清理邮件队列

cd /var/spool  
mv exim exim.old  
mkdir -p exim/input  
mkdir -p exim/msglog  
mkdir -p exim/db  
chown -R mail:mail exim

64位系统需要安装libunwind

wget http://download.savannah.gnu.org/releases/libunwind/libunwind-1.1.tar.gz
tar zxvf libunwind-1.1-alpha.tar.gz
cd libunwind-1.1-alpha/
CFLAGS=-fPIC ./configure
make CFLAGS=-fPIC
make CFLAGS=-fPIC install

安装TCMalloc

wget http://pkgs.fedoraproject.org/repo/pkgs/gperftools/gperftools-2.4.tar.gz/2171cea3bbe053036fb5d5d25176a160/gperftools-2.4.tar.gz
tar zxvf  gperftools-2.4.tar.gz
cd gperftools-2.4/
./configure
make && make install
echo "/usr/local/lib" > /etc/ld.so.conf.d/usr_local_lib.conf
/sbin/ldconfig

MySQL载入

vi /usr/bin/mysqld_safe
#找到 # executing mysqld_safe，在下面加入：
export LD_PRELOAD=/usr/local/lib/libtcmalloc.so
service mysqld restart
#检查是否生效
lsof -n | grep tcmalloc

优化MySQL配置文件

[mysqld]
# WEED 2015-06-06
#default-storage-engine=MyISAM
open_files_limit=60000
innodb_file_per_table=1
local-infile=0
key_buffer_size = 32M
max_allowed_packet = 128M
max_connections = 150
max_user_connections = 50
wait_timeout=30
interactive_timeout=45
connect_timeout=10
tmp-table-size = 256M
max-heap-table-size = 256M
sort_buffer_size = 1M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size = 32M
innodb-flush-method = O_DIRECT
innodb-log-files-in-group = 2
innodb-flush-log-at-trx-commit = 1
innodb-buffer-pool-size = 64M
#innodb-buffer-pool-instances = 2
innodb_buffer_pool_instances = 1
join_buffer_size = 32M
table_open_cache=64
innodb_buffer_pool_size=2G
innodb_thread_concurrency=8
tmpdir = /dev/shm

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash

[myisamchk]
key_buffer = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

该处可参考：http://help.directadmin.com/item.php?id=44

Mod_cache可以缓存常见的静态文件，如：css、js等，提升网页加载速度。

安装

cd /usr/local/directadmin/custombuild/configure/ap2
vi configure.apache

在最底部添加

"--enable-cache" \
"--enable-disk-cache" \
"--enable-mem-cache"

cd /usr/local/directadmin/custombuild
./build apache

配置

cd /etc/httpd/conf/extra/    #进入目录
vi httpd-includes.conf    #编辑配置文件

在配置文件中加入以下内容

<IfModule mod_cache.c>
#CacheForceCompletion 100      #缓存文件数（默认不限制）
CacheDefaultExpire 3600        #缓存默认过期时间（秒）
CacheMaxExpire 86400           #缓存最大过期时间（秒）
CacheLastModifiedFactor 0.1    #缓存时间计算公式，详情请查阅网络资料

<IfModule mod_mem_cache.c>
CacheEnable mem /
MCacheSize 512000            #内存缓冲区大小，根据服务器内存大小调整（单位：kb）
MCacheMaxObjectCount 10000   #缓冲区文件数
MCacheMinObjectSize 1        #缓冲区最小文件（单位：kb）
MCacheMaxObjectSize 51200    #缓冲区最大文件（单位：kb）
</IfModule>
</IfModule>

When creating a large number of partitions or tables, MySQL may mysteriously stop working and you find this type of error on

/var/lib/mysql/$HOSTNAME.err: [ERROR] /usr/sbin/mysqld: Can't open file: './database/table.frm' (errno: 24)rrno: 24

simply means that too many files are open for the given process. There is a read-only mysql variable called open_files_limit that will show how many open files are allowed by the

mysqld

:

SHOW VARIABLES LIKE 'open%'

A lot systems set this to something very low, like 1024. Unfortunately, the following will NOT work:

SET open_files_limit=100000

MySQL will respond with:

ERROR 1238 (HY000): Variable 'open_files_limit' is a read only variable

However, it is possible to make a change to /etc/my.cnf. This file may not exist, if not, just create it. Be sure it has the following contents:

[mysqld]
open_files_limit = 100000
Then, be sure to restart mysql:

sudo /etc/init.d/mysql restart

Now, SHOW VARIABLES LIKE 'open%' should show 100000. The number you use may be different.

If the tally is using up too much disk I/O, you can slow down the dataskq using the ionice binary, if you have it.

限制 dataskq IO占用率, e编辑:

/etc/cron.d/directadmin_cron

or on FreeBSD:

/etc/crontab

打开文件并找到

* * * * * root /usr/local/directadmin/dataskq

修改为:

* * * * * root /usr/bin/ionice -c2 -n7 /usr/local/directadmin/dataskq

of course, you'll need to ensure that you actually have the /usr/bin/ionice binary. Install it if you don't.
Reload crond (or cron) after you make the change.

For backups, you can have the dataskq insert the ionice command in front of all tar, zip and unzip commands:
http://www.directadmin.com/features.php?id=1423

CentOS 安装 ionice:

yum install util-linux

Debian:

apt-get install util-linux

相关官方文档：http://help.directadmin.com/item.php?id=525

If you see the error

/usr/local/lib/libz.so.1: no version information available (required by python)

it has to do with the version of libz installed. The reason for the current version has to do with the version of libz that libxml2 requires. A newer version of both will resolve the issue, but due to many reported issues with this update, we reverted to the older version of libz and libxml2. Note that the warning is not going to hurt anything, so it can be ignored.

We do not recommend using the options below.

If you still wish to update libz and libxml2 to their newer versions to avoid the message, type:

cd /usr/local/directadmin/custombuild
./build update
./build set new_zlib yes
./build update_data
./build zlib
./build libxml2
./build php n

If you host a large database that can't be split up, and your server doesnt have the resources to handle it, you can setup mysql to be run on an external server. This shouldn't be needed too often, as usually, you can just move entire user accounts to another server to ease the load. But in the case of one large database using up the whole server, then you dont' have much choice.

Note that this guide does not transfer any databases over. It's generally a good idea to do this before you add users. Also, mysql will continue to run on your local DA.. so existing databases and scripts should continue to function, but users will not be able to control them through DA.

1)The first step is to install mysql onto the remote server. DA is not require on this server, as it is just used for mysql and nothing else. I won't go into the detail on how to do this (use google).

2) The next step is to setup a user that DA can connect to on the remote mysql server. The default DA uses is da_admin, so staying with that name is a good idea, but not required.
You can use this guide to setup the da_admin user on your server: help.directadmin.com/item.php?id=45. The username and password you setup have to be set in the /usr/local/directadmin/conf/mysql.conf file for DA to use.
On a related note, if the remote server is on a LAN IP, and the connecting IP to that remote server will not be your server IP, but rather some other IP such as a 192.168.x.x type of IP then you can use this guide to add an access host by default instead of the server IP: directadmin.com/features.php?id=818.

Note that the above guide will only grants da_admin on the "localhost", meaning you have to already be on that remote mysql server to use the account. We'll need to add another acccess hsot (ip) to allow the DA server to connect to it. Basically, you just run the "GRANT ALL PRIVILEGES ON *.* TO da_admin@localhost" command again, but you change localhost to the IP of your DA server,

GRANT ALL PRIVILEGES ON *.* TO da_admin@1.2.3.4 WITH GRANT OPTION;
FLUSH PRIVILEGES;

we don't need the "identified by 'pass'" again, because the password is already from adding it the first time.

3) At this point.. the remote mysql database should be setup and ready to accept DA to use it. Test it out by logging into your DA machine via ssh, and type:

mysql -uda_admin -p --host=4.3.2.1

where 4.3.2.1 is the IP of your mysql server. If you can't connect, go back over your settings again.. also make sure that port 3306 is open on the remote box.

4)Now.. the easier part is to tell DA to use the remote server. Edit:
/usr/local/directadmin/conf/mysql.conf
add the line:
host=4.3.2.1
where 4.3.2.1 is the IP of your remote server. Make sure there is a newline character at the end of the line.. (Eg, press enter)

5) That should be it. Go into DA and check the mysql section of your user level to see if you get any errors. If not, try adding a database to make sure it works.

6) The only cleanup task would then be to fix up phpMyAdminto also connect to the remote host.
Edit /var/www/html/phpMyAdmin/config.inc.php
Find this line:

$cfg['Servers'][$i]['host']          = 'localhost'; // MySQL hostname or IP address

and change it to

$cfg['Servers'][$i]['host']          = '4.3.2.1'; // MySQL hostname or IP address

官方文档：http://help.directadmin.com/item.php?id=140

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