{"id":194,"date":"2011-09-18T17:18:00","date_gmt":"2011-09-18T17:18:00","guid":{"rendered":"http:\/\/pheonixsolutions.com\/?p=194"},"modified":"2026-04-26T15:11:41","modified_gmt":"2026-04-26T09:41:41","slug":"no-space-left-on-device-couldnt-create-accept-lock","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/no-space-left-on-device-couldnt-create-accept-lock\/","title":{"rendered":"No space left on device: Couldn&#8217;t create accept lock"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The error <strong>\u201cNo space left on device: Couldn\u2019t create accept lock\u201d<\/strong> in Apache usually indicates that system semaphore limits are exhausted. This can be resolved by clearing unused semaphores and increasing kernel limits.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Root SSH access to the server<\/li>\n\n\n\n<li>Basic knowledge of Linux commands<\/li>\n\n\n\n<li>Access to system configuration files<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Implementation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 1: Remove unused semaphores<br><\/strong>for semid in ipcs -s | grep apachec | cut -f2 -d&#8221; &#8220;; do ipcrm -s $semid; done<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 2: Check current limits<\/strong><br>ipcs -l<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 3: Edit kernel parameters<\/strong><br>vi \/etc\/sysctl.conf<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Add or update the following values:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">kernel.msgmni = 1024<br>kernel.sem = 250 256000 32 1024<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 4: Apply changes<\/strong><br>sysctl -p<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">By clearing unused semaphores and increasing kernel limits, you can resolve the Apache accept lock error and ensure stable server performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction The error \u201cNo space left on device: Couldn\u2019t create accept lock\u201d in Apache usually indicates that system semaphore limits 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