{"id":397,"date":"2026-08-06T02:43:10","date_gmt":"2026-08-06T02:43:10","guid":{"rendered":"http:\/\/123.249.119.122\/Wordpress\/?p=397"},"modified":"2026-08-06T07:39:09","modified_gmt":"2026-08-06T07:39:09","slug":"addition-and-of-hosts-in-ceph-cluster","status":"publish","type":"post","link":"http:\/\/123.249.119.122\/Wordpress\/index.php\/2026\/08\/06\/addition-and-of-hosts-in-ceph-cluster\/","title":{"rendered":"Remove Hosts in Ceph Cluster"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Premise:When the Ceph cluster have problems,how to fix it?How to remove the error host? <\/strong><br>There many troubleshooting steps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1.Check the web page by https:\/\/IP:8443<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"672\" height=\"503\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image.png\" alt=\"\" class=\"wp-image-398\" style=\"aspect-ratio:1.3360269360269361;width:479px;height:auto\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image.png 672w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-300x225.png 300w\" sizes=\"auto, (max-width: 672px) 100vw, 672px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"130\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-1.png\" alt=\"\" class=\"wp-image-399\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-1.png 400w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-1-300x98.png 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2.Check the status of ceph cluster in &#8216;ceph01&#8217; host in the &#8216;cephadm shell&#8217;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check status of hosts in the cluster by <strong>&#8216;ceph orch host ls&#8217;<\/strong>.If status is &#8216;Offline&#8217;,the host is not in the cluster. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"351\" height=\"133\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-2.png\" alt=\"\" class=\"wp-image-400\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-2.png 351w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-2-300x114.png 300w\" sizes=\"auto, (max-width: 351px) 100vw, 351px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Check service of ceph cluster by <strong>&#8216;ceph orch ls&#8217;<\/strong>.There is a mon service not running.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"387\" height=\"264\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-3.png\" alt=\"\" class=\"wp-image-401\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-3.png 387w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-3-300x205.png 300w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Check each service of host by <strong>&#8216;ceph orch ps&#8217;<\/strong>.The mon(monitor) service of ceph03 is error.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"479\" height=\"129\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-4.png\" alt=\"\" class=\"wp-image-402\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-4.png 479w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-4-300x81.png 300w\" sizes=\"auto, (max-width: 479px) 100vw, 479px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3.Check the mon(monitor) service of ceph03 host<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Search the monitor service by <strong>&#8216;systemctl -l | grep mon&#8217;<\/strong> service.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"42\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-5-1024x42.png\" alt=\"\" class=\"wp-image-403\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-5-1024x42.png 1024w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-5-300x12.png 300w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-5-768x32.png 768w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-5.png 1095w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Start the service.When the service can&#8217;t start normally,check the status of the monitor service.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"145\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-6-1024x145.png\" alt=\"\" class=\"wp-image-404\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-6-1024x145.png 1024w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-6-300x43.png 300w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-6-768x109.png 768w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-6.png 1436w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">There are two methods to resolve it.One is read logs,then fix the problem,and then restart monitor service in ceph03 host.The other is remove ceph03 host(when ceph03 host is destructed).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4.Remove services and OSD&#8217;s of ceph03<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before the removal of ceph03 host,you need remove services and OSD&#8217;s of host.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Don&#8217;t remove host directly before the removal of services and OSD&#8217;s.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"830\" height=\"267\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-7.png\" alt=\"\" class=\"wp-image-405\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-7.png 830w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-7-300x97.png 300w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-7-768x247.png 768w\" sizes=\"auto, (max-width: 830px) 100vw, 830px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Remove all service of ceph03 by <strong>&#8216;ceph orch host drain ceph03&#8217;<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check OSD&#8217;s by <strong>&#8216;ceph orch ps&#8217;<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"218\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-8.png\" alt=\"\" class=\"wp-image-406\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-8.png 472w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-8-300x139.png 300w\" sizes=\"auto, (max-width: 472px) 100vw, 472px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">There are 3 OSD&#8217;s in ceph03:<strong>&#8216;osd.2&#8217;<\/strong>,<strong>&#8216;osd.5&#8217;<\/strong>,<strong>&#8216;osd.8&#8217;<\/strong>.Stop them.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"416\" height=\"130\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-9.png\" alt=\"\" class=\"wp-image-407\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-9.png 416w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-9-300x94.png 300w\" sizes=\"auto, (max-width: 416px) 100vw, 416px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">When OSD&#8217;s stopped,remove them.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"476\" height=\"197\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-10.png\" alt=\"\" class=\"wp-image-408\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-10.png 476w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-10-300x124.png 300w\" sizes=\"auto, (max-width: 476px) 100vw, 476px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"305\" height=\"128\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-11.png\" alt=\"\" class=\"wp-image-409\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-11.png 305w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-11-300x126.png 300w\" sizes=\"auto, (max-width: 305px) 100vw, 305px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Erase dada of disks in the host,and delete OSD mapping of the CRUSH.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"566\" height=\"262\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-12.png\" alt=\"\" class=\"wp-image-410\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-12.png 566w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-12-300x139.png 300w\" sizes=\"auto, (max-width: 566px) 100vw, 566px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">If removal is not successful,remove again forcely.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"468\" height=\"129\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-13.png\" alt=\"\" class=\"wp-image-411\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-13.png 468w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-13-300x83.png 300w\" sizes=\"auto, (max-width: 468px) 100vw, 468px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">OSD&#8217;s are successfully removed.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"473\" height=\"131\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-14.png\" alt=\"\" class=\"wp-image-412\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-14.png 473w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-14-300x83.png 300w\" sizes=\"auto, (max-width: 473px) 100vw, 473px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>5.Remove ceph03<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"381\" height=\"152\" src=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-15.png\" alt=\"\" class=\"wp-image-413\" srcset=\"http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-15.png 381w, http:\/\/123.249.119.122\/Wordpress\/wp-content\/uploads\/2026\/08\/image-15-300x120.png 300w\" sizes=\"auto, (max-width: 381px) 100vw, 381px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Premise:When the Ceph cluster have problems,how to fix it?How to remove the error host? There many troubleshooting steps. 1.Check the web page by https:\/\/IP:8443 2.Check the status of ceph cluster in &#8216;ceph01&#8217; host in the &#8216;cephadm shell&#8217; Check status of hosts in the cluster by &#8216;ceph orch host ls&#8217;.If status is &#8216;Offline&#8217;,the host is not [&hellip;]<\/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-397","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/posts\/397","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=397"}],"version-history":[{"count":4,"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/posts\/397\/revisions"}],"predecessor-version":[{"id":418,"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/posts\/397\/revisions\/418"}],"wp:attachment":[{"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=397"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=397"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/123.249.119.122\/Wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}