squid代理服务器
SQUID和MYSQL的安装采用了SUN发布的二进制安装包,它在software_companion_x86 CD中可以找到;MYSQL_AUTH用GOOGLE搜索就可以找到。
一、安装配置SQUID+MYSQL
1.建立用户和组
# groupadd squid
# useradd -g squid -d /dev/null -s /bin/false squid
# groupadd mysql
# useradd -g mysql -s /bin/false mysql
2. 安装MYSQL
# mount –F hsfs –o ro /dev/dsk/c1t0d0p0 /cdrom
# cd /cdrom/components/i386/Packages
# pkgadd -d ./ -s /var/spool/pkg SFWmysql SFWgcmn
# pkgadd SFWgcmn SFWmysql
# chown -R root /opt/sfw/mysql
# chgrp -R mysql /opt/sfw/mysql
# chown -R mysql /opt/sfw/mysql/var
# /opt/sfw/mysql/bin/mysql_install_db
# /opt/sfw/mysql/bin/mysqld_safe &
# cp /opt/sfw/mysql/share/mysql/my-medium.cnf /etc/my.cnf
# vi /etc/my.cnf
bind-address = 127.0.0.1
设置启动脚本:
# cp /opt/sfw/mysql/share/mysql/mysql.server /etc/init.d/mysql.server
# ln /etc/init.d/mysql.server /etc/rc3.d/S79mysql
# ln /etc/init.d/mysql.server /etc/rc0.d/K00mysql
# ln /etc/init.d/mysql.server /etc/rc1.d/K00mysql
# ln /etc/init.d/mysql.server /etc/rc2.d/K00mysql
# ln /etc/init.d/mysql.server /etc/rcS.d/K00mysql
# chown root:sys /etc/init.d/mysql.server /etc/rc3.d/S79mysql
# chmod 0744 /etc/init.d/mysql.server /etc/rc3.d/S79mysql
设置ROOT密码:
# mysqladmin -u root password llzqq
3.安装SQUID
# pkgadd -d ./ -s /var/spool/pkg SFWsquid
# pkgadd SFWsquid
# cd /opt/sfw/squid/etc
# cp squid.conf.default squid.conf
# cp mime.conf.default mime.conf
4.配置SQUID.CONF
http_port 192.168.0.1:3128
cache_mgr llzqq@nero.3322.org
error_directory /opt/sfw/squid/share/errors/Simplify_Chinese
dns_nameservers 202.99.160.68 202.99.168.8
visible_hostname nero.3322.org
httpd_accel_uses_host_header on
httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
cache_mem 20 MB
maximum_object_size 4096 KB
minimum_object_size 0 KB
maximum_object_size_in_memory 30 KB
minimum_object_size_in_memory 0 KB
cache_swap_low 85
cache_swap_high 90
cache_dir ufs /opt/sfw/squid/var/cache
cache_effective_user squid
cache_effective_group squid
#http_access allow manager localhost
#http_access allow localhost
#http_access deny manager
#http_access deny !Safe_ports
#http_access deny CONNECT !SSL_ports
#http_access deny all
http_reply_access allow all
icp_access allow all
miss_access allow all
--------------------------------------------------------
# chown –R squid:squid /opt/sfw/squid/var
# /opt/sfw/squid/sbin/squid -z
5. SQUID启动脚本
# vi /etc/rc3.d/S78squid
====================== S78squid =====================
#!/sbin/sh
#
# Copyright (c) 2004 by llzqq, Inc
# llzqq@126.com
# All rights reserved.
#
#ident '@(#)squid 1.1 04/05/24 SMI'
case '{GetProperty(Content)}' in
start)
/opt/sfw/squid/sbin/squid -s
;;
stop)
/opt/sfw/squid/sbin/squid -k shutdown
pkill squid
;;
*)
echo 'Usage: {GetProperty(Content)} { start | stop }'
exit 1
;;
esac
exit 0
====================== S78squid =====================
# chown root:sys /etc/rc3.d/S78squid
# chmod 744 /etc/rc3.d/S78squid
# ln -s /etc/rc3.d/S78squid /etc/rc2.d/K78squid
二、 安装MYSQL_AUTH
# gzip -d mysql_auth-0.6beta.tar.gz
# tar vxf mysql_auth-0.6beta.tar
# cd mysql_auth-0.6beta
Makefile中需要修改的内容如下:
# vi Makefile
CFLAGS = -I/opt/sfw/mysql/include -L/opt/sfw/mysql/lib/mysql
INSTALL = /usr/ucb/install
$(INSTALL) -o root -g sys -m 700 mypasswd /usr/local/bin/mypasswd
$(INSTALL) -o squid -g squid -m 755 mysql_auth /usr/bin/mysql_auth
$(INSTALL) -o squid -g squid -m 600 $(CONF) /etc/mysql_auth.conf
$(INSTALL) -o squid -g squid -m 600 $(CONF) /etc/mysql_auth.conf.default
src/define.h中需要修改的内容如下:
# vi +5 src/define.h
#define CONFIG_FILE '/etc/mysql_auth.conf'
#define DEF_MYSQLD_SOCKET '/tmp/mysql.sock'
src/mysql_auth.conf中需要修改的内容如下:
# vi src/mysql_auth.conf
mysqld_socket /tmp/mysql.sock
# /usr/ccs/bin/make
# /usr/ccs/bin/make install
创建用户数据库:
# cd scripts
# mysql -u root -p******
测试MYSQL_AUTH
1.添加一个测试用户
# mypasswd llzqq 123456
Password record ADDED succesfully.
2.验证刚才建立的用户
# mysql_auth
llzqq 123456
0K
3.删除一个已经建立的用户用这个命令
# mypasswd –d username
三、在SQUID.CONF中增加MYSQL_AUTH认证部分
# vi /etc/squid/squid.conf
添加下面的代码到SQUID.CONF中“TAG: acl”一节的后面
auth_param basic program /usr/bin/mysql_auth
auth_param basic realm LLZQQ’S CACHING SERVER
auth_param basic children 5
auth_param basic credentialsttl 2 hours
acl password proxy_auth REQUIRED
http_access allow password
authenticate_ip_ttl 2 hours
http_access deny all
四、客户端设置
在浏览器的代理服务器设置中填写SQUID服务器的IP和端口:
192.168.0.1:3218
在下载软件FLASHGET的代理服务器设置中填写SQUID服务器的IP、端口、用户和密码:
192.168.0.1:3218
user:llzqq
passwd:123456
五、注意事项
在进行以上安装前要先安装GCC否则不能编译MYSQL_AUTH,另外在添加用户前需要设置ROOT用户的LD_LIBRARY_PATH变量中有这个路径:/opt/sfw/mysql/lib/mysql

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB

MySQL/InnoDB supports four transaction isolation levels: ReadUncommitted, ReadCommitted, RepeatableRead and Serializable. 1.ReadUncommitted allows reading of uncommitted data, which may cause dirty reading. 2. ReadCommitted avoids dirty reading, but non-repeatable reading may occur. 3.RepeatableRead is the default level, avoiding dirty reading and non-repeatable reading, but phantom reading may occur. 4. Serializable avoids all concurrency problems but reduces concurrency. Choosing the appropriate isolation level requires balancing data consistency and performance requirements.

MySQL is suitable for web applications and content management systems and is popular for its open source, high performance and ease of use. 1) Compared with PostgreSQL, MySQL performs better in simple queries and high concurrent read operations. 2) Compared with Oracle, MySQL is more popular among small and medium-sized enterprises because of its open source and low cost. 3) Compared with Microsoft SQL Server, MySQL is more suitable for cross-platform applications. 4) Unlike MongoDB, MySQL is more suitable for structured data and transaction processing.

MySQL index cardinality has a significant impact on query performance: 1. High cardinality index can more effectively narrow the data range and improve query efficiency; 2. Low cardinality index may lead to full table scanning and reduce query performance; 3. In joint index, high cardinality sequences should be placed in front to optimize query.

The MySQL learning path includes basic knowledge, core concepts, usage examples, and optimization techniques. 1) Understand basic concepts such as tables, rows, columns, and SQL queries. 2) Learn the definition, working principles and advantages of MySQL. 3) Master basic CRUD operations and advanced usage, such as indexes and stored procedures. 4) Familiar with common error debugging and performance optimization suggestions, such as rational use of indexes and optimization queries. Through these steps, you will have a full grasp of the use and optimization of MySQL.

MySQL's real-world applications include basic database design and complex query optimization. 1) Basic usage: used to store and manage user data, such as inserting, querying, updating and deleting user information. 2) Advanced usage: Handle complex business logic, such as order and inventory management of e-commerce platforms. 3) Performance optimization: Improve performance by rationally using indexes, partition tables and query caches.


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