自由云服务器是一种提供云计算服务的资源，用户可以按需使用和支付。
自由半径（FreeRADIUS）是一个开源的认证、授权和计费服务器，广泛应用于网络接入控制、用户管理等场景，本文将详细介绍如何搭建一个自由半径服务器，帮助大家快速上手并解决实际问题。
安装前准备
1、系统环境：建议使用Linux操作系统，如CentOS、Ubuntu等。
2、软件包：确保系统已经安装了gcc、make、openssl-devel等编译工具和依赖库。
3、下载源码：从FreeRADIUS官网（
编译安装
1、解压源码包：使用tar命令解压源码包，
tar -zxvf freeradius-3.0.14.tar.gz
2、进入解压后的目录：
cd freeradius-3.0.14
3、配置编译选项：运行configure脚本，指定安装路径和相关参数，
./configure –prefix=/usr/local/freeradius –sysconfdir=/etc/freeradius –with-modules=mod_sql,mod_ldap,mod_auth_mysql,mod_eap_tls,mod_preauth,mod_pap,mod_files,mod_dictionary,mod_exec,mod_expiration,mod_filter,mod_coa,mod_proxy,mod_dyndb,mod_mschapv2,mod_nss,mod_ntlm_auth,mod_oauth2,mod_pwcheck,mod_session,mod_stream_file,mod_unlang,mod_uniqueid,mod_virtual
4、编译源码：运行make命令进行编译，
make
5、安装：运行make install命令进行安装，
make install
配置与启动
1、复制配置文件：从源码包中的samples目录下复制一份默认的配置文件到/etc/freeradius目录下，
cp /usr/local/freeradius-3.0.14/samples/files/authorize {COMMON,DEFAULT} /etc/freeradius/3.0/sites-enabled/authorize
2、修改配置文件：根据实际需求修改配置文件中的参数，例如修改数据库连接信息、认证方式等。
3、创建数据库表：在数据库中执行SQL脚本，创建FreeRADIUS所需的表结构，对于MySQL数据库，可以执行以下SQL脚本：
CREATE DATABASE radius;
GRANT ALL PRIVILEGES ON radius.* TO ‘freeradius’@’localhost’ IDENTIFIED BY ‘your_password’;
FLUSH PRIVILEGES;
USE radius;
SOURCE /path/to/freeradius-3.0.14/sql/mysql/createtables.sql;
4、启动FreeRADIUS服务：运行以下命令启动FreeRADIUS服务，
sudo /usr/local/freeradius-3.0.14/sbin/radiusd -f /etc/freeradius/3.0/radiusd.conf -l debug -s stop -E -D /var/log/freeradius -P /var/run/radiusd.pid -t /usr/local/freeradius-3.0.14/sbin/raddbd -r /var/run/radiusd.sock -W /var/run/radiusd-waitsock -X /usr/local/freeradius-3.0.14/sbin/sqlexecd -u freeradius -h localhost -p your_password -D mysql -t radius -S radius -M mysql -L localhost -e utf8 -U root -P your_password -F /etc/freeradius/3.0/clients.conf -N radius -Z localhost:3306 -a 127.0.0.1:3306 -b “SELECT id, secret FROM users” -c “SELECT id, attribute FROM attributes” -k “SELECT id FROM dictionaries” -V “SELECT id FROM clients” -T “SELECT id FROM radcheck” -R “SELECT id FROM radreply” -W “SELECT id FROM radpostauth” -Y “SELECT id FROM radusergroups” -O “SELECT id FROM radgroupcheck” -G “SELECT id FROM radgroups” -J “SELECT id FROM radattrvalue” -N “SELECT id FROM radattrnames” -Q “SELECT id FROM radreplyattrs” -S “SELECT id FROM radusers” -I “SELECT id FROM radchecksums” -F “SELECT id FROM radgroupassignments” -U “SELECT id FROM radusergroups” -K “SELECT id FROM radattrmaps” -V “SELECT id FROM radattrvalues” -L “SELECT id FROM radreplyattributes” -M “SELECT id FROM radpostauths” -N “SELECT id FROM radusers” -P “SELECT id FROM radchecks” -R “SELECT id FROM radreplies” -T “SELECT id FROM clients” -W “SELECT id FROM radpostauths” -Y “SELECT id FROM radusergroups” -O “SELECT id FROM radgroupchecks” -G “SELECT id FROM radgroups” -J “SELECT id FROM radattrvalues” -N “SELECT id FROM radattrnames” -Q “SELECT id FROM radreplyattrs” -S “SELECT id FROM radusers” -I “SELECT id FROM radchecksums” -F “SELECT id FROM radgroupassignments” -U “SELECT id FROM radusergroups” -K “SELECT id FROM radattrmaps” -V “SELECT id FROM radattrvalues” -L “SELECT id FROM radreplyattributes” -M “SELECT id FROM radpostauths” -N “SELECT id FROM radusers” -P “SELECT id FROM radchecks” -R “SELECT id FROM radreplies” -T “SELECT id FROM clients” -W “SELECT id FROM radpostauths” -Y “SELECT id FROM radusergroups” -O “SELECT id FROM radgroupchecks” -G “SELECT id FROM radgroups” -J “SELECT id FROM radattrvalues” -N “SELECT id FROM radattrnames” -Q “SELECT id FROM radreplyattrs” -S “SELECT id FROM radiususers” -I “SELECT id FROM checksums” -F “SELECT id FROM groupassignments” -U “SELECT id FROM usergroups” -K “SELECT id FROM attributemaps” -V “SELECT id FROM attributevalues” -L “SELECT id FROM replyattributes” -M “SELECT id FROM postauths” –stop –child –nowait –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.sql –exec tests/sql/*.
