为了在服务器重新启动时自动建立连接，可以启用 OpenVPN 客户端 systemd 服务。
在执行此操作之前，请将 VPN 配置文件的扩展名从 更改.ovpn为.conf. 相应地替换文件名。
cp koromicha.ovpn koromicha.conf将文件复制.conf到 OpenVPN 客户端配置目录/etc/openvpn/client.
cp koromicha.conf /etc/openvpn/client
/etc/openvpn/client接下来，启动 OpenVPN 客户端 systemd 服务。将名称koromicha替换为 .conf 配置文件的名称。
systemctl start openvpn-client@koromicha检查状态；
systemctl status openvpn-client@koromicha● openvpn-client@koromicha.service - OpenVPN tunnel for koromicha
Loaded: loaded (/lib/systemd/system/openvpn-client@.service; disabled; vendor preset: enabled)
Active: active (running) since Wed 2020-04-14 16:00:35 EAT; 8s ago
Docs: man:openvpn(8)
https://community.openvpn.net/openvpn/wiki/Openvpn24ManPage
https://community.openvpn.net/openvpn/wiki/HOWTO
Main PID: 6877 (openvpn)
Status: "Initialization Sequence Completed"
Tasks: 1 (limit: 2300)
CGroup: /system.slice/system-openvpn\x2dclient.slice/openvpn-client@koromicha.service
└─6877 /usr/sbin/openvpn --suppress-timestamps --nobind --config koromicha.conf
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: Incoming Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: ROUTE_GATEWAY 10.0.2.2/255.255.255.0 IFACE=enp0s3 HWADDR=08:00:27:4b:ff:18
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: TUN/TAP device tun0 opened
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: TUN/TAP TX queue length set to 100
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: /sbin/ip link set dev tun0 up mtu 1500
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: /sbin/ip addr add dev tun0 10.8.0.2/24 broadcast 10.8.0.255
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: /sbin/ip route add 192.168.2.132/32 via 10.0.2.2
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: /sbin/ip route add 0.0.0.0/1 via 10.8.0.1
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: /sbin/ip route add 128.0.0.0/1 via 10.8.0.1
Elb 14 16:00:37 ubuntu1804.kifarunix-demo.com openvpn[6877]: Initialization Sequence Completed使其能够在系统启动时运行；
systemctl enable openvpn-client@koromicha您已在 CentOS 8 上成功安装和设置 OpenVPN 客户端。
关于如何在 CentOS 8上安装和配置 OpenVP 客户端的教程到此结束。