centos7搭建dns主从服务器配置_配置ldap主从
搭建DNS主从服务器配置
1、安装bind服务
（图片来源网络，侵删）在主服务器上执行以下命令：
yum install bind bindutils y
在从服务器上执行以下命令：
yum install bind bindutils y
2、配置主服务器
编辑主服务器的配置文件/etc/named.conf，添加以下内容：
zone "example.com" { type master; file "/var/named/example.com.zone"; };创建区域文件/var/named/example.com.zone，并添加以下内容：
$TTL 604800 @ IN SOA ns1.example.com. admin.example.com. ( 1 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; @ IN NS ns1.example.com. @ IN A 192.168.1.1 ns1 IN A 192.168.1.1 www IN A 192.168.1.2
3、配置从服务器
编辑从服务器的配置文件/etc/named.conf，添加以下内容：
（图片来源网络，侵删） zone "example.com" { type slave; file "/var/named/example.com.zone"; masters { 192.168.1.1; }; # 主服务器IP地址 };4、启动并设置开机自启动bind服务
在主服务器和从服务器上执行以下命令：
systemctl start named && systemctl enable named
5、测试DNS解析是否正常工作
在主服务器和从服务器上分别执行以下命令：
dig @localhost example.com A +short
配置LDAP主从服务器
1、安装openldap服务和相关工具包
在主服务器上执行以下命令：
yum install openldap openldapservers openldapclients y
在从服务器上执行以下命令：
（图片来源网络，侵删）yum install openldap openldapservers openldapclients y
2、配置主服务器（以主服务器IP地址为192.168.1.1为例）
编辑主服务器的配置文件/etc/openldap/slapd.conf，添加以下内容：
```bashinclude /etc/openldap/schema/core.schema
include /etc/openldap/schema/cosine.schema
include /etc/openldap/schema/nis.schema
include /etc/openldap/schema/inetorgperson.schema
include /etc/openldap/schema/dyngroup.schema
include /etc/openldap/schema/misc.schema
include /etc/openldap/schema/javax.naming.directory.schemaext.schemas/*.schemaexts; # for JNDI compatibility with RFC 2377 schema extensions (e.g., jpegPhoto, jetconfig, etc) backend dba_db { database = bdb; hash = unique; } slapdpidfile /var/run/slapd.pid slapd_flags file_id_lookup off read_only off # slapd will not update the directory unless you specify this flag! index subordinates subentry # allow subordinates to be indexed access to * by * read write # allow anyone to read and write access to * by self read write # allow self to read and write access to * by users read # allow users to read access to * by anonymous authcid password # use the standard Unix authentication scheme (uid+password) # if you are using SASL, change this line to: #authentication sasl diference method bcrypt salt=3 rounds=00000000000000000000000000000000 syncrepl rid=rootpw checkQuota no rootdn "cn=admin,dc=example,dc=com" rootpw secret adminpw secret # Change this line if you want to use a different database location! dbdirectory /var/lib/ldap # Change this line if you want to use a different database location! database dumploglevel none autoindex on # Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the directory schema# Turn on automatic indexing of attributes in the
下面是一个简单的介绍，描述了在CentOS 7系统上搭建DNS主从服务器和配置LDAP主从的步骤。
DNS主从服务器配置
| 步骤 | 主服务器操作 | 从服务器操作 |
| 1. 安装BIND | yum install bind bindutils | yum install bind bindutils |
| 2. 主服务器配置 | 编辑/etc/named.conf配置文件指定区域记录和允许的从服务器 | 编辑/etc/named.conf配置文件指定主服务器地址和区域 |
| 3. 区域文件配置 | 创建或编辑/var/named/下的区域文件添加SOA记录和NS记录 | 确保从主服务器可以获取区域文件 |
| 4. 权限设置 | 设置区域文件权限：chown named:named /var/named/ | 设置区域文件权限：chown named:named /var/named/ |
| 5. 启动和测试 | 启动DNS服务：systemctl start named检查配置： namedcheckconf | 启动DNS服务：systemctl start named使用 dig测试从服务器是否可以获取记录 |
| 6. 防火墙设置 | 允许DNS服务通过防火墙：firewallcmd addservice=dns permanent重新加载防火墙： firewallcmd reload | 同主服务器 |
LDAP主从服务器配置
| 步骤 | 主服务器操作 | 从服务器操作 |
| 1. 安装OpenLDAP | yum install openldap openldapservers openldapclients | yum install openldap openldapservers openldapclients |
| 2. 配置OpenLDAP | 初始化LDAP目录：slaptest编辑配置文件： /etc/openldap/slapd.conf | 编辑配置文件指向主服务器 |
| 3. 启动LDAP服务 | 启动服务：systemctl start slapd设置开机启动： systemctl enable slapd | 启动服务：systemctl start slapd |
| 4. 配置同步 | 在主服务器上配置syncrepl策略 | 在从服务器上配置syncrepl策略，指向主服务器 |
| 5. 权限和认证 | 设置访问控制：slapd.access配置TLS/SSL加密 | 配置相同的访问控制和认证策略 |
| 6. 同步测试 | 使用ldapsearch测试主服务器上的数据 | 确认从服务器上的数据与主服务器一致 |
| 7. 防火墙设置 | 允许LDAP服务通过防火墙：firewallcmd addservice=ldap permanent重新加载防火墙： firewallcmd reload | 同主服务器 |
请注意，以上介绍是一个简化的步骤说明，具体的配置文件内容、同步策略和安全设置等需要根据实际的环境和需求进行调整，在进行这些操作之前，建议详细阅读相关文档，以确保理解每一步的细节和影响。