{"id":3808,"date":"2023-02-21T17:53:30","date_gmt":"2023-02-21T17:53:30","guid":{"rendered":"https:\/\/www.webhi.com\/how-to\/?p=3808"},"modified":"2024-08-07T09:56:11","modified_gmt":"2024-08-07T09:56:11","slug":"how-to-install-openvpn-server-on-ubuntu","status":"publish","type":"post","link":"https:\/\/www.webhi.com\/how-to\/how-to-install-openvpn-server-on-ubuntu\/","title":{"rendered":"How to Install OpenVPN Server on Ubuntu"},"content":{"rendered":"\n
\"Install<\/figure>\n\n\n\n

OpenVPN is a free, open-source VPN (Virtual Private Network) software that allows you to securely connect to a remote network over the internet. In this article, we will guide you through the process of installing OpenVPN on an Ubuntu server 18.04\/20.04\/22.04.<\/p>\n\n\n\n

Method 1:<\/h2>\n\n\n\n

Installing OpenVPN using a Script.<\/p>\n\n\n\n

First, get the script and make it executable:<\/p>\n\n\n\n

$ curl -O https:\/\/raw.githubusercontent.com\/angristan\/openvpn-install\/master\/openvpn-install.sh\n$ chmod +x openvpn-install.sh<\/code><\/pre>\n\n\n\n
Then run it:<\/p>\n\n\n\n
$ .\/openvpn-install.sh<\/code><\/pre>\n\n\n\n
You need to run the script as root and have the TUN module enabled.<\/p>\n\n\n\n
The first time you run it, you’ll have to follow the assistant and answer a few questions to setup your VPN server.<\/p>\n\n\n\n
When OpenVPN is installed, you can run the script again, and you will get the choice to:<\/p>\n\n\n\n
root@ubuntu:~# .\/openvpn-install.sh\nWelcome to OpenVPN-install!\nThe git repository is available at: https:\/\/github.com\/angristan\/openvpn-install\n\nIt looks like OpenVPN is already installed.\n\nWhat do you want to do?\n   1) Add a new user\n   2) Revoke existing user\n   3) Remove OpenVPN\n   4) Exit\nSelect an option [1-4]:<\/pre>\n\n\n\n
you can add a new user or revoke an existant user .<\/p>\n\n\n\n
<\/p>\n\n\n\n
\n\n\n\n
<\/p>\n\n\n\n
Method 2 :<\/h2>\n\n\n\n
Step 1: Update and Upgrade Ubuntu<\/h2>\n\n\n\n
Before installing any new software, it is always recommended to update and upgrade your Ubuntu system. You can do this by running the following commands:<\/p>\n\n\n\n
$ sudo apt update<\/span> \n$ sudo apt upgrade<\/span><\/code><\/pre>\n\n\n\n
Step 2: Install OpenVPN<\/h2>\n\n\n\n
You can install OpenVPN on Ubuntu by running the following command:<\/p>\n\n\n\n
$ sudo apt install openvpn easy-rsa<\/code><\/pre>\n\n\n\n
Step 3: Generate Certificates and Keys<\/h2>\n\n\n\n
OpenVPN uses certificates and keys to authenticate clients and servers. You can generate these files by running the easy-rsa script included with OpenVPN. To do this, follow these steps:<\/p>\n\n\n\n
$ make-cadir ~\/openvpn-ca && cd ~\/openvpn-ca<\/code><\/pre>\n\n\n\n
 Edit the vars<\/code> file to set up the Certificate Authority (CA) variables:<\/p>\n\n\n\n
$ nano .\/vars<\/code><\/pre>\n\n\n\n
Edit the variables as needed, for example:<\/p>\n\n\n\n
set_var EASYRSA_REQ_COUNTRY    \"US\"\nset_var EASYRSA_REQ_PROVINCE   \"California\"\nset_var EASYRSA_REQ_CITY       \"San Francisco\"\nset_var EASYRSA_REQ_ORG        \"Copyleft Certificate Co\"\nset_var EASYRSA_REQ_EMAIL      \"me@example.net\"\nset_var EASYRSA_REQ_OU         \"My Organizational Unit\"<\/code><\/pre>\n\n\n\n
$ .\/easyrsa init-pki<\/span>\n$ .\/easyrsa build-c<\/span>a\n$ .\/easyrsa gen-req server nopass<\/span>\n$ .\/easyrsa sign-req server server<\/span>\n$ .\/easyrsa gen-dh<\/span>\n<\/span>$ openvpn --genkey --secret pki\/ta.key<\/code><\/pre>\n\n\n\n
The certificates and keys will be created in the \/root\/openvpn-ca\/pki<\/code> directory.<\/p>\n\n\n\n
Step 4: Configure OpenVPN<\/h2>\n\n\n\n
After generating the certificates and keys, you need to configure OpenVPN. To do this, create a new configuration file with the following command:<\/p>\n\n\n\n
$ sudo cp pki\/dh.pem pki\/ca.crt pki\/ta.key pki\/issued\/server.crt pki\/private\/server.key \/etc\/openvpn\/\n$ sudo cp \/usr\/share\/doc\/openvpn\/examples\/sample-config-files\/server.conf \/etc\/openvpn\/server.conf<\/code><\/pre>\n\n\n\n
Edit the following content in the configuration file \/etc\/openvpn\/server.conf<\/code>:<\/p>\n\n\n\n
ca ca.crt\ncert server.crt\nkey server.key  # This file should be kept secret\ndh dh.pem\n;tls-auth ta.key 0\ntls-crypt ta.key\npush \"redirect-gateway def1 bypass-dhcp\"<\/code><\/pre>\n\n\n\n
Save and close the file.<\/p>\n\n\n\n
Enable IP Forwarding<\/p>\n\n\n\n
$ sudo nano \/etc\/sysctl.conf\n# Uncomment the following line:\nnet.ipv4.ip_forward=1<\/code><\/pre>\n\n\n\n
Then apply the changes:<\/p>\n\n\n\n
$ sudo sysctl -p<\/code><\/pre>\n\n\n\n
Step 5: Start and Enable OpenVPN<\/h2>\n\n\n\n
You can start and enable the OpenVPN service with the following commands:<\/p>\n\n\n\n
$ sudo systemctl start openvpn@server<\/span> \n$ sudo systemctl enable openvpn@server<\/span><\/code><\/pre>\n\n\n\n
The @server<\/code> part specifies the name of the configuration file you created earlier.<\/p>\n\n\n\n
Step 6: Configure Firewall<\/h2>\n\n\n\n
You need to allow OpenVPN traffic through the firewall. You can do this by creating a new rule with the following command:<\/p>\n\n\n\n
$ sudo ufw allow OpenVPN<\/span> # ignore if you don't use firewall<\/code><\/pre>\n\n\n\n
Add iptables routing<\/p>\n\n\n\n
$ ifconfig\n.\n.\n.\nvenet0: flags=211<UP,BROADCAST,POINTOPOINT,RUNNING,NOARP>  mtu 1500\n        inet 127.0.0.1  netmask 255.255.255.255  broadcast 0.0.0.0  destination 127.0.0.1\n        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 0  (UNSPEC)\n        RX packets 4825  bytes 467045 (467.0 KB)\n        RX errors 0  dropped 0  overruns 0  frame 0\n        TX packets 3331  bytes 322185 (322.1 KB)\n        TX errors 0  dropped 1167 overruns 0  carrier 0  collisions 0\n\nvenet0:0: flags=211<UP,BROADCAST,POINTOPOINT,RUNNING,NOARP>  mtu 1500\n        inet 7.249.98.8  netmask 255.255.255.0  broadcast 7.249.98.255  destination 7.249.98.8\n        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 0  (UNSPEC)\n.\n.<\/code><\/pre>\n\n\n\n
Our main network is venet0<\/kbd> you may have eth0<\/kbd> or something else<\/p>\n\n\n\n
$ sudo iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -o venet0 -j MASQUERADE<\/code><\/pre>\n\n\n\n
Step 7: Connect to OpenVPN Server<\/h2>\n\n\n\n
Now that the OpenVPN server is up and running, you can connect to it from a client computer. To do this, you need to install the OpenVPN client software on your computer and download the client configuration file from the server. You can do this by running the following command on the server:<\/p>\n\n\n\n
$ .\/easyrsa gen-req client1 nopass\n$ .\/easyrsa sign-req client client1\n$ sudo cp pki\/private\/client1.key \/etc\/openvpn\/client\/\n$ sudo cp pki\/issued\/client1.crt \/etc\/openvpn\/client\/\n$ sudo cp pki\/{ca.crt,ta.key} \/etc\/openvpn\/client\/<\/code><\/pre>\n\n\n\n
 Create a client configuration file into the \/root\/openvpn-ca<\/code> directory to use as your base configuration:<\/p>\n\n\n\n
$ sudo cp \/usr\/share\/doc\/openvpn\/examples\/sample-config-files\/client.conf \/root\/openvpn-ca\/<\/code><\/pre>\n\n\n\n
Open this file using nano<\/code> and edit this variables:<\/p>\n\n\n\n
remote 192.168.1.5 1194 # 192.168.1.5 is the server public IP\n\nuser nobody\ngroup nogroup\n\n;ca ca.crt\n;cert client.crt\n;key client.key\n;tls-auth ta.key 1\n\nkey-direction 1<\/code><\/pre>\n\n\n\n
Now create a script to compile the base configuration with the necessary certificate, key, and encryption files.<\/p>\n\n\n\n
$ nano config_gen.sh<\/code><\/pre>\n\n\n\n
 Add the following content:<\/p>\n\n\n\n
#!\/bin\/bash\n\n# First argument: Client identifier\n\nKEY_DIR=\/etc\/openvpn\/client\nOUTPUT_DIR=\/root # change it to output directory\nBASE_CONFIG=\/root\/openvpn-ca\/client.conf # Change it to client.conf in your system\n\ncat ${BASE_CONFIG} \\\n    <(echo -e '<ca>') \\\n    ${KEY_DIR}\/ca.crt \\\n    <(echo -e '<\/ca>\\n<cert>') \\\n    ${KEY_DIR}\/${1}.crt \\\n    <(echo -e '<\/cert>\\n<key>') \\\n    ${KEY_DIR}\/${1}.key \\\n    <(echo -e '<\/key>\\n<tls-crypt>') \\\n    ${KEY_DIR}\/ta.key \\\n    <(echo -e '<\/tls-crypt>') \\\n    > ${OUTPUT_DIR}\/${1}.ovpn<\/code><\/pre>\n\n\n\n
After writing the script, save and close the config_gen.sh file.<\/p>\n\n\n\n
Don’t forget to make the file executable by running:<\/p>\n\n\n\n
$ sudo chmod 700 \/root\/openvpn-ca\/config_gen.sh\n$ sudo .\/config_gen.sh client1<\/code><\/pre>\n\n\n\n
This command will create a new file called client1.ovpn<\/code> in the \/root\/<\/code> directory.<\/p>\n\n\n\n
Copy this file to your client computer and use it to connect to the OpenVPN server.<\/p>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
In this tutorial, we have shown you how to install and configure OpenVPN on an Ubuntu server. With OpenVPN, you can securely connect to a remote network and access its resources from anywhere in the world.<\/p>\n","protected":false},"excerpt":{"rendered":"
OpenVPN is a free, open-source VPN (Virtual Private Network) software that allows you to securely connect to a remote network over the internet. In this article, we will guide you through the process of installing OpenVPN on an Ubuntu server 18.04\/20.04\/22.04. Method 1: Installing OpenVPN using a Script. First, get the script and make it ..<\/p>\n
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