2016年1月

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>

安装

wget https://raw.github.com/sivel/speedtest-cli/master/speedtest_cli.py
chmod a+rx speedtest_cli.py
sudo mv speedtest_cli.py /usr/local/bin/speedtest-cli
sudo chown root:root /usr/local/bin/speedtest-cli

使用

speedtest-cli