{"id":2310,"date":"2023-01-28T09:19:00","date_gmt":"2023-01-28T03:49:00","guid":{"rendered":"https:\/\/trysiteprice.com\/blog\/?p=2310"},"modified":"2023-01-28T09:19:00","modified_gmt":"2023-01-28T03:49:00","slug":"ubuntu-18-04-setup-ssh-public-key-authentication","status":"publish","type":"post","link":"https:\/\/trysiteprice.com\/blog\/ubuntu-18-04-setup-ssh-public-key-authentication\/","title":{"rendered":"Ubuntu 18.04 Setup SSH Public Key Authentication"},"content":{"rendered":"<p>To set up SSH public key authentication on an Ubuntu 18.04 system, you can use the following steps:<\/p>\n<ol>\n<li>Open a terminal and run the following command to generate a new SSH key pair:<\/li>\n<\/ol>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs\">ssh-keygen<br \/>\n<\/code><\/div>\n<\/div>\n<p>By default, the key will be saved in the <code>~\/.ssh\/<\/code> directory with the file name <code>id_rsa<\/code>.<\/p>\n<ol start=\"2\">\n<li>Press <code>Enter<\/code> to accept the default location and file name for the key, or enter a different file name if desired.<\/li>\n<li>Next, you will be prompted to enter a passphrase. If you want to use password-less authentication, you can leave the passphrase blank.<\/li>\n<li>Once the key is generated, run the following command to copy the public key to the remote server:<\/li>\n<\/ol>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs language-sql\">ssh<span class=\"hljs-operator\">-<\/span><span class=\"hljs-keyword\">copy<\/span><span class=\"hljs-operator\">-<\/span>id <span class=\"hljs-keyword\">user<\/span><span class=\"hljs-variable\">@remote<\/span><span class=\"hljs-operator\">-<\/span>server<span class=\"hljs-operator\">-<\/span>ip<br \/>\n<\/code><\/div>\n<\/div>\n<p>Replace &#8220;user&#8221; with your username on the remote server and &#8220;remote-server-ip&#8221; with the IP address or hostname of the remote server.<\/p>\n<ol start=\"5\">\n<li>You will be prompted to enter the password for the remote user, and then the public key will be added to the remote user&#8217;s authorized_keys file.<\/li>\n<li>Now you can use <code>ssh user@remote-server-ip<\/code> command to log in to the remote server without being prompted for a password.<\/li>\n<li>To disable password authentication you can edit the ssh config file by running the following command:<\/li>\n<\/ol>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs language-bash\">sudo nano \/etc\/ssh\/sshd_config<br \/>\n<\/code><\/div>\n<\/div>\n<ol start=\"8\">\n<li>Locate the line that starts with <code>PasswordAuthentication<\/code> and change it to <code>no<\/code> and save the changes.<\/li>\n<li>Restart the SSH service:<\/li>\n<\/ol>\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs\">sudo systemctl restart ssh<br \/>\n<\/code><\/div>\n<\/div>\n<p>By following these steps, you should now be able to log in to the remote server using SSH public key authentication.<\/p>\n<p>It is also recommended to use ssh-agent and ssh-add to add the ssh key to the ssh-agent and ssh-add command to add the key to ssh-agent every time you log in to the system.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To set up SSH public key authentication on an Ubuntu 18.04 system, you can use the following steps: Open a terminal and run the following command to generate a new SSH key pair: ssh-keygen By default, the key will be saved in the ~\/.ssh\/ directory with the file name id_rsa. Press Enter to accept the &#8230; <a title=\"Ubuntu 18.04 Setup SSH Public Key Authentication\" class=\"read-more\" href=\"https:\/\/trysiteprice.com\/blog\/ubuntu-18-04-setup-ssh-public-key-authentication\/\" aria-label=\"Read more about Ubuntu 18.04 Setup SSH Public Key Authentication\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2310","post","type-post","status-publish","format-standard","hentry","category-best-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ubuntu 18.04 Setup SSH Public Key Authentication - TrySitePrice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/trysiteprice.com\/blog\/ubuntu-18-04-setup-ssh-public-key-authentication\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ubuntu 18.04 Setup SSH Public Key Authentication - TrySitePrice\" \/>\n<meta property=\"og:description\" content=\"To set up SSH public key authentication on an Ubuntu 18.04 system, you can use the following steps: Open a terminal and run the following command to generate a new SSH key pair: ssh-keygen By default, the key will be saved in the ~\/.ssh\/ directory with the file name id_rsa. 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