{"id":15118,"date":"2025-06-20T15:56:02","date_gmt":"2025-06-20T10:26:02","guid":{"rendered":"https:\/\/www.skynats.com\/?p=15118"},"modified":"2025-06-20T18:07:23","modified_gmt":"2025-06-20T12:37:23","slug":"how-to-fix-php-fpm-startup-error-due-to-missing-libargon2-so-0-or-other-shared-libraries","status":"publish","type":"post","link":"https:\/\/www.skynats.com\/blog\/how-to-fix-php-fpm-startup-error-due-to-missing-libargon2-so-0-or-other-shared-libraries\/","title":{"rendered":"How to Fix PHP-FPM Startup Error Due to Missing libargon2.so.0 (or Other Shared Libraries)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-small-font-size\" id=\"h-introduction\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When running PHP-FPM on a cPanel server, especially after system updates or migrations, you may encounter PHP-FPM Startup Error Due to Missing libargon2.so.0 or similar errors like:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/cpanel\/ea-phpXX\/root\/usr\/sbin\/php-fpm: error while loading shared libraries: libargon2.so.0: cannot open shared object file: No such file or directory<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This PHP-FPM Startup Error Due to Missing libargon2.so.0 typically occurs because PHP-FPM relies on certain system libraries to function correctly. If one of these shared libraries is not present or not properly configured, PHP-FPM fails to start. In this case, libargon2.so.0 is missing or <a href=\"https:\/\/www.php.net\/\" target=\"_blank\" rel=\"noopener\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\">PHP<\/mark><\/a> can\u2019t find it. This guide walks you through resolving this issue for all installed PHP versions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\">What is libargon2?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">libargon2 is a password hashing library used by PHP (especially with password functions like password_hash() using ARGON2I or ARGON2ID).<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-small-font-size\">Step-by-Step Fix<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">1. Install libargon2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you&#8217;re using AlmaLinux 9, RHEL 9, or CentOS Stream, install the missing library with:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>dnf install libargon2<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">On older systems (CentOS 7 \/ AlmaLinux 8), use:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>yum install libargon2<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">For Ubuntu\/Debian:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>apt update<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>apt install libargon2-1<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading has-small-font-size\">What If the Library Is Installed But Still Errors?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes, PHP-FPM expects libargon2.so.0 but only libargon2.so.1 is present. You can resolve this by creating a symbolic link:<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\" id=\"h-step-1-locate-the-installed-library\">Step 1: Locate the Installed Library<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>find \/usr -name \"libargon2.so*\"\n\nExample output:\n\/usr\/lib64\/libargon2.so.1             # RHEL-based\n\/usr\/lib\/x86_64-linux-gnu\/libargon2.so.1   # Debian-based<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\" id=\"h-step-2-create-a-symlink\">Step 2: Create a Symlink<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">RHEL\/CentOS:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ln -s \/usr\/lib64\/libargon2.so.1 \/usr\/lib64\/libargon2.so.0<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ubuntu\/Debian:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ln -s \/usr\/lib\/x86_64-linux-gnu\/libargon2.so.1 \/usr\/lib\/x86_64-linux-gnu\/libargon2.so.0<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\" id=\"h-step-3-refresh-the-linker-cache\">Step 3: Refresh the Linker Cache<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>ldconfig<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\" id=\"h-step-4-restart-php-fpm-any-version\">Step 4: Restart PHP-FPM (any version)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>systemctl restart ea-php74-php-fpm     # For cPanel (ea-php)\nsystemctl restart php7.4-fpm           # For Ubuntu\/Debian-style PHP<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Use the following command to check which PHP versions are installed:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ls \/opt\/cpanel\/ | grep ea-php<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-small-font-size\">Conclusion<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Missing shared libraries are a common cause of PHP-FPM startup errors. The solution is usually straightforward: install the missing package, create a symlink if necessary, and restart PHP-FPM. This general approach applies to other libraries as well \u2014 not just libargon2.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Note: Always ensure you restart the correct PHP-FPM version after the fix.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you&#8217;re facing challenges resolving the PHP-FPM Startup Error Due to Missing libargon2.so.0 or other similar shared library issues, our expert support team is here to help. At Skynats, we specialize in advanced <a href=\"https:\/\/www.skynats.com\/server-management\/\">server management services<\/a> and troubleshooting, ensuring minimal downtime and secure environments. Contact us today to quickly fix PHP-FPM startup errors and restore your server functionality with confidence.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction When running PHP-FPM on a cPanel server, especially after system updates or migrations, you may encounter PHP-FPM Startup Error Due to Missing libargon2.so.0 or similar errors like: This PHP-FPM Startup Error Due to Missing libargon2.so.0 typically occurs because PHP-FPM relies on certain system libraries to function correctly. If one of these shared libraries is [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[1055,871,302],"class_list":["post-15118","post","type-post","status-publish","format-standard","hentry","category-blog","tag-libargon2-so-0","tag-php-fpm-2","tag-server-management-services"],"_links":{"self":[{"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/posts\/15118","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/comments?post=15118"}],"version-history":[{"count":3,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/posts\/15118\/revisions"}],"predecessor-version":[{"id":15122,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/posts\/15118\/revisions\/15122"}],"wp:attachment":[{"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/media?parent=15118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/categories?post=15118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.skynats.com\/blog\/wp-json\/wp\/v2\/tags?post=15118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}