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练习四
任务需求：客户端通过访问 www.nihao.com 后，能够通过 dns 域名解析，访问到 nginx 服务中由 nfs 共享的首页文件，内容为：Very good, you have successfully set up the system. 各个主机能够实现时间同步，并且都开启防火墙来保证服务安装。
主机规划
| 作用 | 系统 | IP | 主机名 | 软件 |
|---|---|---|---|---|
| web 服务器 | redhat9.5 | 192.168.72.8 | web | nginx |
| nfs 服务器 | redhat9.5 | 192.168.72.9 | nfs | nfs-utils |
| DNS 主服务器 | redhat9.5 | 192.168.72.18 | dns1 | bind |
| DNS 从服务器 | redhat9.5 | 192.168.72.28 | dns2 | bind |
| 客户端 | redhat9.5 | 192.168.72.7 | client | bind-utils |
此处我们采用 192.168.23.0 网段。
基础配置
# 首先修改好各个虚拟机的主机名称，然后安装对应服务
[root@web ~]# dnf install -y vim net-tools wget curl # 每台都安装[root@web ~]# dnf install -y nginx
[root@nfs ~]# dnf install -y nfs-utils
[root@dns1 ~]# dnf install -y bind bind-utils
[root@dns2 ~]# dnf install -y bind bind-utils# 设置SELinux，其他虚拟机同理
[root@web ~]# sed -i "s/^SELINUX=enforcing$/SELINUX=permissive/g" /etc/selinux/config
[root@web ~]# setenforce 0# IP配置
[root@web ~]# nmcli c modify ens160 ipv4.method manual ipv4.dns 223.5.5.5 ipv4.gateway 192.168.23.2 connection.autoconnect yes
[root@web ~]# nmcli c up ens160
[root@nfs ~]# nmcli c modify ens160 ipv4.method manual ipv4.dns 223.5.5.5 ipv4.gateway 192.168.23.2 connection.autoconnect yes
[root@nfs ~]# nmcli c up ens160
...# 放行防火墙，全都执行
# 允许 HTTP 和 NFS
[root@web ~]# firewall-cmd --add-service=http --permanent
[root@web ~]# firewall-cmd --add-service=nfs --permanent
# 允许 DNS
[root@web ~]# firewall-cmd --add-service=dns --permanent
[root@web ~]# firewall-cmd --reload 配置 NFS 服务器
# 创建共享目录并设置权限
[root@nfs ~]# mkdir -p /nfs/share
[root@nfs ~]# chmod 777 /nfs/share
[root@nfs ~]# echo "Very good, you have successfully set up the system." > /nfs/share/index.html# 编辑导出文件
[root@nfs ~]# vim /etc/exports
[root@nfs ~]# cat /etc/exports
/nfs/share 192.168.23.0/24(rw) # 重启服务并导出共享
[root@server ~]# systemctl restart nfs-server.service
[root@nfs ~]# exportfs -a
# 查看共享列表
[root@nfs ~]# showmount -e 192.168.23.110
Export list for 192.168.23.110:
/nfs/share 192.168.23.0/24# web 端 挂载 NFS 共享
[root@web ~]# mkdir -p /nfs/data
[root@web ~]# mount 192.168.23.9:nfs/share /nfs/data/ # 查看挂载
[root@web ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 4.0M 0 4.0M 0% /dev
...
192.168.23.110:/nfs/share 45G 1.7G 43G 4% /nfs/data# 共享成功
[root@web ~]# ls /nfs/data/
index.html配置 Web 服务器
# 创建配置文件
[root@web ~]# vim /etc/nginx/conf.d/nihao.conf
[root@web ~]# cat /etc/nginx/conf.d/nihao.conf
server {listen 80;server_name www.nihao.com;location / {root /nfs/data/;index index.html;}access_log /var/log/nginx/nihao_access.log;error_log /var/log/nginx/nihao_error.log;
}# 验证配置文件是否有效
[root@web ~]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful# 重启 nginx 服务
[root@web ~]# systemctl restart nginx# 放行 80 端口
[root@web ~]# firewall-cmd --permanent --add-port=80/tcp
success
[root@web ~]# firewall-cmd --reload
success
[root@web ~]# firewall-cmd --list-all
public (active)target: defaulticmp-block-inversion: nointerfaces: ens160sources: services: cockpit dhcpv6-client http nfs sshports: 80/tcpprotocols: forward: yesmasquerade: noforward-ports: source-ports: icmp-blocks: rich rules:# 访问测试
[root@web ~]# curl 192.168.23.120
Very good, you have successfully set up the system.
# 在浏览器中访问也可成功配置 DNS 服务器
DNS 主服务器
# 编辑配置文件
[root@dns1 ~]# vim /etc/named.conf
[root@dns1 ~]# cat /etc/named.conf
options {listen-on port 53 { 192.168.23.18; };directory "/var/named";allow-query { any; };
};zone "nihao.com" IN { type master; file "named.nihao";
}; # 创建区域文件
[root@dns1 ~]# vim /var/named/nihao.com
[root@dns1 ~]# cat /var/named/nihao.com
$TTL 1D
@ IN SOA @ admin.nihao.com. (01D1H1W3H
)IN NS dns1IN NS dns2
dns1 IN A 192.168.23.18
dns2 IN A 192.168.23.28www IN A 192.168.23.8# 检查语法
[root@dns1 ~]# named-checkconf
[root@dns1 ~]# named-checkzone nihao.com /var/named/nihao.com
zone named.nihao/IN: loaded serial 0
OK# 放行dns服务
[root@dns1 ~]# firewall-cmd --permanent --add-service=dns
success
[root@dns1 ~]# firewall-cmd --reload
success# 启动服务
[root@dns1 ~]# systemctl start named
# 测试
[root@dns1 ~]# dig -t NS nihao.com @192.168.23.18
; <<>> DiG 9.16.23-RH <<>> -t NS nihao.com @192.168.23.18
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33261
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: e1fff3b55157e8c40100000067dd9bdf6413b426e37b22a7 (good)
;; QUESTION SECTION:
;nihao.com. IN NS;; ANSWER SECTION:
nihao.com. 86400 IN NS dns2.nihao.com.
nihao.com. 86400 IN NS dns1.nihao.com.;; ADDITIONAL SECTION:
dns1.nihao.com. 86400 IN A 192.168.23.18
dns2.nihao.com. 86400 IN A 192.168.23.28;; Query time: 1 msec
;; SERVER: 192.168.23.121#53(192.168.23.18)
;; WHEN: Sat Mar 22 01:03:27 CST 2025
;; MSG SIZE rcvd: 136[root@dns1 ~]# dig -t A www.nihao.com @localhost; <<>> DiG 9.16.23-RH <<>> -t A www.nihao.com @localhost
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10479
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 837700d53e1a335f0100000067dda8385100719c201d76dc (good)
;; QUESTION SECTION:
;www.nihao.com. IN A;; ANSWER SECTION:
www.nihao.com. 86400 IN A 192.168.23.120;; Query time: 1 msec
;; SERVER: ::1#53(::1)
;; WHEN: Sat Mar 22 01:56:08 CST 2025
;; MSG SIZE rcvd: 86DNS 从服务器
# 添加相应的从区域配置
[root@dns2 ~]# vim /etc/named.conf
[root@dns2 ~]# cat /etc/named.conf
options {listen-on port 53 { 192.168.23.28; };directory "/var/named";allow-query { any; };
};zone "nihao.com" IN { type slave; file "slaves/nihao.com"; masters { 192.168.23.18; }; # DNS 主服务器的 IP 地址
}; # 检查语法
[root@dns2 ~]# named-checkconf
[root@dns2 ~]# named-checkzone nihao.com /var/named/slaves/nihao.com
zone named.nihao/IN: loaded serial 0
OK # 放行dns服务
[root@dns2 ~]# firewall-cmd --permanent --add-service=dns
success
[root@dns2 ~]# firewall-cmd --reload
success# 启动服务
[root@dns2 ~]# systemctl restart named
# 测试
[root@dns2 ~]# dig -t NS nihao.com @192.168.23.28; <<>> DiG 9.16.23-RH <<>> -t NS nihao.com @192.168.23.122
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 46829
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 586b1174f309e1a50100000067dd9fd4ef875dd122e0a5a5 (good)
;; QUESTION SECTION:
;nihao.com. IN NS;; Query time: 1 msec
;; SERVER: 192.168.23.122#53(192.168.23.28)
;; WHEN: Sat Mar 22 01:20:20 CST 2025
;; MSG SIZE rcvd: 66[root@dns2 ~]# dig -t A www.nihao.com @192.168.23.28; <<>> DiG 9.16.23-RH <<>> -t A www.nihao.com @192.168.23.28
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36168
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: ef03521d1b3ff5450100000067dda7bd7574cd4fd6911d00 (good)
;; QUESTION SECTION:
;www.nihao.com. IN A;; ANSWER SECTION:
www.nihao.com. 86400 IN A 192.168.23.8;; Query time: 1 msec
;; SERVER: 192.168.23.122#53(192.168.23.28)
;; WHEN: Sat Mar 22 01:54:05 CST 2025
;; MSG SIZE rcvd: 86配置时间同步
# 全部主机都执行
[root@web ~]# dnf install -y chrony
[root@web ~]# systemctl start chronyd
# 查看时间状态，可以在 /etc/chrony.conf 中配置适合的 NTP 服务器
[root@web ~]# timedatectl statusLocal time: Sat 2025-03-22 00:47:39 CSTUniversal time: Fri 2025-03-21 16:47:39 UTCRTC time: Fri 2025-03-21 16:47:39Time zone: Asia/Shanghai (CST, +0800)
System clock synchronized: yesNTP service: activeRTC in local TZ: no客户端测试
[root@client ~]# curl http://www.nihao.com
[root@client ~]# ping www.nihao.com
PING game-website-f45.pages.dev (172.66.44.73) 56(84) bytes of data.
64 bytes from 172.66.44.73 (172.66.44.73): icmp_seq=1 ttl=128 time=163 ms
64 bytes from 172.66.44.73 (172.66.44.73): icmp_seq=2 ttl=128 time=164 ms
[root@client ~]# curl 192.168.23.120
Very good, you have successfully set up the system.