本教程將向您展示如何在 CentOS 8 上安裝 OpenVPN。對於那些不知道的人，OpenVPN 是一個廣泛使用的開源應用程序，用於在不安全的開放公共互聯網上創建安全的數字專用網絡。它是一種 SSL VPN 解決方案，使 OpenVPN 具有客戶端-服務器架構的特點。任何連接到虛擬專用網絡的給定設備的行為就像它連接到局域網一樣。 通過 VPN 隧道發送的某些數據包使用 256 位 AES 加密進行加密，以防止數據被盜。
本文假設您至少具有 Linux 的基本知識，知道如何使用 shell，最重要的是，您在自己的 VPS 上託管您的網站。 假設您在 root 帳戶下運行，安裝非常簡單。sudo‘ 到命令以獲得 root 權限。 我將逐步向您展示如何在 CentOS 8 上安裝 OpenVPN 服務器。
在 CentOS 8 上安裝 OpenVPN
步驟1。首先，確保您的系統是最新的。
sudo dnf clean all sudo dnf update
步驟 2. 在 CentOS 8 上安裝 OpenVPN。
接下來，從 GitHub 下載腳本以自動安裝 OpenVPN。
git clone https://github.com/Nyr/openvpn-install.git
然後切換到 openvpn-install 打開目錄並運行安裝程序腳本。
chmod +x openvpn-install.sh sudo ./openvpn-install.sh
您應該得到以下輸出：
Welcome to this OpenVPN "road warrior" installer!
I need to ask you a few questions before starting the setup.
You can leave the default options and just press enter if you are ok with them.
First, provide the IPv4 address of the network interface you want OpenVPN
listening to.
IP address: 192.168.77.20 This server is behind NAT. What is the public IPv4 address or hostname?
Public IP address / hostname: vpn.idroot.us Which protocol do you want for OpenVPN connections?
1) UDP (recommended)
2) TCP
Protocol [1-2]: 1 What port do you want OpenVPN listening to?
Port: 148
Which DNS do you want to use with the VPN?
1) Current system resolvers
2) 1.1.1.1
3) Google
4) OpenDNS
5) Verisign
DNS [1-5]: 3 Finally, tell me your name for the client certificate.
Please, use one word only, no special characters.
Client name: godetz Okay, that was all I needed. We are ready to set up your OpenVPN server now.
Press any key to continue…
Updating Subscription Management repositories.
Updating Subscription Management repositories.
Extra Packages for Enterprise Linux 8 - x86_64 189 kB/s | 16 MB 01:24
Last metadata expiration check: 0:00:40 ago on Wed 16 Dec 2019 09:36:46 PM EAT.
Package epel-release-7-11.noarch is already installed.
Dependencies resolved.
Nothing to do.
Complete!主要的 OpenVPN 服務器配置文件是/etc/openvpn/server.conf 隨意調整您的喜好。
$ cat /etc/openvpn/server.conf port 148 proto udp dev tun sndbuf 0 rcvbuf 0 ca ca.crt cert server.crt key server.key dh dh.pem auth SHA512 tls-auth ta.key 0 topology subnet server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 192.168.22.1" keepalive 30 120 cipher AES-256-CBC user nobody group nobody persist-key persist-tun status openvpn-status.log verb 3 crl-verify crl.pem
步驟 3. 生成 OpenVPN 用戶配置文件。
然後使用以下命令生成客戶端證書和密鑰：
$ sudo ./openvpn-install.sh
Looks like OpenVPN is already installed.
What do you want to do?
1) Add a new user
2) Revoke an existing user
3) Remove OpenVPN
4) Exit
Select an option [1-4]: 1 Tell me a name for the client certificate.
Please, use one word only, no special characters.
Client name: meilana
Using SSL: openssl OpenSSL 1.1.1 FIPS 11 Sep 2018
Can't load /etc/openvpn/easy-rsa/pki/.rnd into RNG
139966006863680:error:2406F079:random number generator:RAND_load_file:Cannot open file:crypto/rand/randfile.c:90:Filename=/etc/openvpn/easy-rsa/pki/.rnd
Generating a RSA private key
……………………………………………………………………..+++++
……………………………………….+++++
writing new private key to '/etc/openvpn/easy-rsa/pki/private/meilana.key.SmeichedelicsaH'
Using configuration from /etc/openvpn/easy-rsa/pki/safessl-easyrsa.cnf
Can't load /etc/openvpn/easy-rsa/pki/.rnd into RNG
13982808174100232:error:2406F079:random number generator:RAND_load_file:Cannot open file:crypto/rand/randfile.c:90:Filename=/etc/openvpn/easy-rsa/pki/.rnd
Check that the request matches the signature
Signature ok
The Subject's Distinguished Name is as follows
commonName :ASN.1 12:'meilana'
Certificate is to be certified until Dec 10 16:36:46 2026 GMT (3650 days)
Write out database with 1 new entries
Data Base Updated
Client user1 added, configuration is available at: /root/meilana.ovpn這個 .ovpn OpenVPN 配置文件位於里面 /root 文件夾。
步驟 4. 從您的客戶端連接到 OpenVPN 服務器。
您可以使用與您選擇的 VPN 客戶端關聯的操作系統來配置 OpenVPN 客戶端。如果你想使用官方的 OpenVPN 客戶端，請看這裡。 下載頁面 安裝後獲取最新版本。
恭喜！ 您已成功安裝 OpenVPN。感謝您使用本教程在您的 CentOS 8 系統上安裝 OpenVPN 服務器。如需更多幫助或有用信息，我們建議您查看 OpenVPN官網.
