{"id":2658,"date":"2020-12-01T10:04:00","date_gmt":"2020-12-01T01:04:00","guid":{"rendered":"http:\/\/43.203.250.216\/?p=2658"},"modified":"2025-10-01T16:26:11","modified_gmt":"2025-10-01T07:26:11","slug":"lightsail-ubuntu-20-04-%ec%97%85%ea%b7%b8%eb%a0%88%ec%9d%b4%eb%93%9c-%ed%9b%84-ssh-%ec%a0%91%ec%86%8d-%eb%b6%88%ea%b0%80-%ed%98%84%ec%83%81","status":"publish","type":"post","link":"https:\/\/litcoder.com\/?p=2658","title":{"rendered":"Lightsail Ubuntu 20.04 \uc5c5\uadf8\ub808\uc774\ub4dc \ud6c4 ssh \uc811\uc18d \ubd88\uac00 \ud604\uc0c1"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Lightsail\uc758 \uc774\ubbf8\uc9c0\ub97c Ubuntu 20.04 LTS\ub85c  \uc5c5\uadf8\ub808\uc774\ub4dc \ud55c \ud6c4 web \ud658\uacbd\uc5d0\uc11c SSH \uc811\uc18d\uc774 \ub418\uc9c0 \uc54a\uc544\uc11c \ub610 \ub9dd\ud588\ub2e4\uba70 \uba38\ub9ac\ub97c \uc950\uc5b4 \ub72f\uace0 \uc788\ub294\ub370, \uc6b0\uc5f0\ud788, \ub2f9\uc5f0\ud788 \uc548 \ub420 \uac70\ub77c\uace0 \uc0dd\uac01\ud588\ub358 \ud130\ubbf8\ub110 \ud504\ub85c\uadf8\ub7a8\uc744 \ud1b5\ud55c SSH \uc811\uc18d\uc740 \ub610 \ub418\ub294 \uae30\ud604\uc0c1\uc744 \ubc1c\uacac\ud588\ub2e4. \uc774 \ub300\ub85c\ub3c4 \ub098\uc058\uc9c4 \uc54a\uc9c0\ub9cc \uc880 \ucc1c\ucc1c \ud558\uae30\ub3c4 \ud558\uace0 \ud574\uc11c \uc880 \ub354 \ucc3e\uc544 \ubcf4\uc558\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/litcoder.com\/wp-content\/uploads\/2024\/05\/sc_lightsail_ssh_failure.png\" alt=\"\" class=\"wp-image-3426\" srcset=\"https:\/\/litcoder.com\/wp-content\/uploads\/2024\/05\/sc_lightsail_ssh_failure.png 758w, https:\/\/litcoder.com\/wp-content\/uploads\/2024\/05\/sc_lightsail_ssh_failure-300x169.png 300w, https:\/\/litcoder.com\/wp-content\/uploads\/2024\/05\/sc_lightsail_ssh_failure-624x351.png 624w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\uc811\uc18d \uc624\ub958\uac00 \ubc1c\uc0dd\ud560 \ub54c\uc758 \ub85c\uadf8\ub97c \ubcf4\uba74 \ub2e4\uc74c\uacfc \uac19\uc740\ub370,<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"raw\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">$ cat \/var\/log\/auth.log|tail\n...\nsshd[4528]: userauth_pubkey: certificate signature algorithm ssh-rsa: signature algorithm not supported [preauth]\n...<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc774 \ubb38\uc81c\uc758 \ud574\uacb0\ucc45\uc5d0 \ub300\ud574 \uc544\uc8fc \uc790\uc138\ud788 \uc124\uba85\ub41c <a href=\"https:\/\/ibug.io\/blog\/2020\/04\/ssh-8.2-rsa-ca\/\">Use RSA CA Certificates with OpenSSH 8.2<\/a>\uc5d0 \ub530\ub974\uba74, (Ubuntu 20.04\uc5d0 \ud3ec\ud568\ub41c) OpenSSH 8.2 \ubd80\ud130\ub294 \ubcf4\uc548 \ubb38\uc81c\ub85c SHA-1 \uae30\ubc18\uc778 ssh-rsa\uac00 \uae30\ubcf8 CA signature \ud56d\ubaa9\uc5d0\uc11c \ube60\uc9c0\uba74\uc11c \uc774\ub7ec\ud55c \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud558\uac8c \ub41c\ub2e4\uace0 \ud55c\ub2e4. \ud574\uacb0 \ubc29\ubc95\uc740 CASignatureAlgorithms\uc5d0 ssh-rsa\ub97c \uc9c0\uc6d0\ud558\ub3c4\ub85d \uba85\uc2dc\ud558\ub294 \uac83\uc774\ub2e4.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"raw\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">$ cat \/etc\/ssh\/sshd_config|tail\n...\n# Use RSA CA cert.\n# https:\/\/ibug.io\/blog\/2020\/04\/ssh-8.2-rsa-ca\/\nCASignatureAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uc704\uc758 \ub9c1\ud06c\uc5d0\uc11c \uc81c\uc548\ud558\ub294 \ub300\ub85c sshd_config \ud30c\uc77c\uc5d0 CASignatureAlgorithms \ud56d\ubaa9\uc744 \uc704\uc640 \uac19\uc774 \ucd94\uac00 \ud558\uace0 sshd service\ub97c \uc7ac \uc2e4\ud589 \ud558\uace0\ub098\ub2c8, web \ud658\uacbd SSH\uac00 \uc798 \ub3d9\uc791\ud558\uac8c \ub418\uc5c8\ub2e4. \ubb3c\ub860, \ud130\ubbf8\ub110\ub3c4 \uadf8\ub300\ub85c \uc798 \ub41c\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"686\" height=\"483\" src=\"https:\/\/litcoder.com\/wp-content\/uploads\/2024\/05\/sc_lightsail_ssh_ok.png\" alt=\"\" class=\"wp-image-3427\" srcset=\"https:\/\/litcoder.com\/wp-content\/uploads\/2024\/05\/sc_lightsail_ssh_ok.png 686w, https:\/\/litcoder.com\/wp-content\/uploads\/2024\/05\/sc_lightsail_ssh_ok-300x211.png 300w, https:\/\/litcoder.com\/wp-content\/uploads\/2024\/05\/sc_lightsail_ssh_ok-624x439.png 624w\" sizes=\"auto, (max-width: 686px) 100vw, 686px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Lightsail\uc758 \uc774\ubbf8\uc9c0\ub97c Ubuntu 20.04 LTS\ub85c \uc5c5\uadf8\ub808\uc774\ub4dc \ud55c \ud6c4 web \ud658\uacbd\uc5d0\uc11c SSH \uc811\uc18d\uc774 \ub418\uc9c0 \uc54a\uc544\uc11c \ub610 \ub9dd\ud588\ub2e4\uba70 \uba38\ub9ac\ub97c \uc950\uc5b4 \ub72f\uace0 \uc788\ub294\ub370, \uc6b0\uc5f0\ud788, \ub2f9\uc5f0\ud788 \uc548 \ub420 \uac70\ub77c\uace0 \uc0dd\uac01\ud588\ub358 \ud130\ubbf8\ub110 \ud504\ub85c\uadf8\ub7a8\uc744 \ud1b5\ud55c SSH \uc811\uc18d\uc740 \ub610 \ub418\ub294 \uae30\ud604\uc0c1\uc744 \ubc1c\uacac\ud588\ub2e4. \uc774 \ub300\ub85c\ub3c4 \ub098\uc058\uc9c4 \uc54a\uc9c0\ub9cc \uc880 \ucc1c\ucc1c \ud558\uae30\ub3c4 \ud558\uace0 \ud574\uc11c \uc880 \ub354 \ucc3e\uc544 \ubcf4\uc558\ub2e4. \uc811\uc18d \uc624\ub958\uac00 \ubc1c\uc0dd\ud560 \ub54c\uc758 \ub85c\uadf8\ub97c \ubcf4\uba74 \ub2e4\uc74c\uacfc [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[4,5],"tags":[17,190,258,117,259,257],"class_list":["post-2658","post","type-post","status-publish","format-standard","hentry","category-linux","category-programming","tag-aws","tag-lightsail","tag-openssh","tag-ssh","tag-ssh-rsa","tag-sshd"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/posts\/2658","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/litcoder.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2658"}],"version-history":[{"count":10,"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/posts\/2658\/revisions"}],"predecessor-version":[{"id":3688,"href":"https:\/\/litcoder.com\/index.php?rest_route=\/wp\/v2\/posts\/2658\/revisions\/3688"}],"wp:attachment":[{"href":"https:\/\/litcoder.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2658"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/litcoder.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2658"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/litcoder.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2658"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}