{"id":731,"date":"2018-03-29T10:39:42","date_gmt":"2018-03-29T02:39:42","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=731"},"modified":"2018-03-29T10:39:42","modified_gmt":"2018-03-29T02:39:42","slug":"kdumpctl-no-memory-reserved-for-crash-kernel","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=731","title":{"rendered":"kdumpctl: No memory reserved for crash kernel."},"content":{"rendered":"
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kdump \u662f\u4e00\u79cd kernel crash dump \u7684\u673a\u5236\uff0c\u5b83\u53ef\u4ee5\u5728\u5185\u6838 crash \u65f6\u4fdd\u5b58\u7cfb\u7edf\u7684\u5185\u5b58\u4fe1\u606f\u7528\u4e8e\u540e\u7eed\u7684\u5206\u6790\u3002kdump \u662f\u57fa\u4e8e kexec \u7684\u3002
\ncrash \u662f\u4e00\u4e2a\u7528\u4e8e\u4ea4\u4e92\u5f0f\u5730\u5206\u6790\u6b63\u5728\u8fd0\u884c\u7684 Linux \u7cfb\u7edf\u6216\u8005 kernel crash \u540e\u7684 core dump \u6570\u636e\u7684\u5de5\u5177\u3002<\/p>\n

\u8bb0\u5f55\u4e00\u4e0b\u95ee\u9898\u53ca\u5176\u89e3\u51b3\u65b9\u6cd5\uff1a<\/p>\n

\u5728 centos7 \u4e2d\u7684 kdump.service \u670d\u52a1\u4e00\u76f4\u4e0d\u80fd\u6b63\u5e38\u542f\u52a8\uff0c\u5982\u4e0b\uff1a<\/p>\n

[root@mesos-slave-dev001-cqdx ~]# systemctl status kdump.service<\/span>\n\u25cf kdump.service<\/span> - Crash recovery kernel arming\n   Loaded: loaded (\/usr\/lib\/systemd\/system\/kdump.service<\/span>; enabled; vendor preset: enabled)<\/span>\n   Active: failed (Result: exit-code) since \u4e8c 2016<\/span>-07<\/span>-19<\/span> 14<\/span>:07<\/span>:37<\/span> CST; 1min 1s ago<\/span>\n  Process: 5416<\/span> ExecStart=\/usr\/bin\/kdumpctl start (code=exited, status=1<\/span>\/FAILURE)\n Main PID: 5416<\/span> (code=exited, status=1<\/span>\/FAILURE)\n\n7<\/span>\u6708 19<\/span> 14<\/span>:07<\/span>:35<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> systemd[1<\/span>]: Starting Crash recovery kernel arming...\n7<\/span>\u6708 19<\/span> 14<\/span>:07<\/span>:37<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> kdumpctl[5416<\/span>]: No memory reserved for crash kernel.\n7<\/span>\u6708 19<\/span> 14<\/span>:07<\/span>:37<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> kdumpctl[5416<\/span>]: Starting kdump: [FAILED]\n7<\/span>\u6708 19<\/span> 14<\/span>:07<\/span>:37<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> systemd[1<\/span>]: kdump.service<\/span>: main process exited, code=exited, status=1<\/span>\/FAILURE\n7<\/span>\u6708 19<\/span> 14<\/span>:07<\/span>:37<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> systemd[1<\/span>]: Failed to start Crash recovery kernel arming.\n7<\/span>\u6708 19<\/span> 14<\/span>:07<\/span>:37<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> systemd[1<\/span>]: Unit kdump.service<\/span> entered failed state.\n7<\/span>\u6708 19<\/span> 14<\/span>:07<\/span>:37<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> systemd[1<\/span>]: kdump.service<\/span> failed.\n<\/code><\/pre>\n
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    \u9700\u8981\u5728 kernel \u542f\u52a8\u547d\u4ee4\u884c\u53c2\u6570\u4e2d\u6dfb\u52a0 crashkernel \u53c2\u6570\uff0c\u5e76\u542f\u52a8 kdump \u670d\u52a1\u3002
    \n\u4e00\u822c\u8bbe\u7f6e\u4e3a crashkernel=auto \u8868\u793a\u6839\u636e\u7cfb\u7edf\u5185\u5b58\u81ea\u52a8 reserve \u4e00\u4e9b\u5185\u5b58\u7ed9 kernelcrash \u7528\uff0c\u5728 x86_64 \u7cfb\u7edf\u4e2d\u5185\u5b58\u5927\u4e8e\u7b49\u4e8e 2GB \u65f6\u4f1a reserve \u5185\u5b58\uff0c\u6700\u5c0f\u4fdd\u7559\u5185\u5b58\u8ba1\u7b97\u65b9\u6cd5\u662f\uff1a160 MB + 2 bits for every 4 KB of RAM.
    \n\u5f53\u7136\uff0c\u4e5f\u53ef\u4ee5\u8bbe\u7f6e crashkernel=512M \u8fd9\u6837\u7684\u56fa\u5b9a\u4fdd\u7559\u5185\u5b58\u3002<\/p>\n
    \u7528 yum install kexec-tools \u5b89\u88c5 kdump \u5de5\u5177\u548c\u670d\u52a1
    \n\u7528 systemctl start kdump \u547d\u4ee4\u53ef\u4ee5\u542f\u52a8 kdump.service\uff0c\u7528 systemctl enable kdump \u8ba9 dump \u670d\u52a1\u5728\u5f00\u673a\u65f6\u81ea\u52a8\u542f\u52a8\u3002
    \nkdump.service \u76f8\u5173\u7684\u914d\u7f6e\u6587\u4ef6 \/etc\/kdump.conf \u91cc\u9762\u53ef\u4ee5\u4fee\u6539\u4e00\u4e9b\u9ed8\u8ba4\u7684\u914d\u7f6e\uff0c\u6bd4\u5982 dump \u5b8c\u6210\u540e\u7684\u52a8\u4f5c\uff08\u9ed8\u8ba4\u662f reboot\uff09\u3001dump \u6587\u4ef6\u5b58\u653e\u7684\u65b9\u5f0f\uff08\u672c\u5730\u76ee\u5f55\u3001NFS\u3001scp \u5230\u53e6\u5916\u670d\u52a1\u5668\u7b49\uff09\u3002<\/p>\n
    \u73b0\u5728\u6765\u770b\u95ee\u9898\uff1a<\/p>\n
    \u5176\u5b9e\u662f\u9700\u8981\u8bbe\u7f6e\u4e00\u4e0b crashkernel=auto
    \n\u68c0\u67e5\u540e\uff0c\u53d1\u73b0 \/etc\/default\/grub \u6587\u4ef6\u5e76\u4e0d\u5b58\u5728\uff0c\u6dfb\u52a0\u8be5\u6587\u4ef6\u7684\u914d\u7f6e\u4fe1\u606f\uff0c\u5982\u4e0b\uff1a<\/p>\n
    GRUB_TIMEOUT=5<\/span><\/span><\/span>\nGRUB_DISTRIBUTOR=\"$(sed 's, release .*$,,g' \/etc\/system-release)\"<\/span><\/span><\/span>\nGRUB_DEFAULT=saved<\/span><\/span>\nGRUB_DISABLE_SUBMENU=true<\/span><\/span><\/span>\nGRUB_TERMINAL_OUTPUT=\"console\"<\/span><\/span><\/span>\nGRUB_CMDLINE_LINUX=\"crashkernel=auto net.ifnames=0 biosdevname=0 rhgb quiet\"<\/span><\/span><\/span>\nGRUB_DISABLE_RECOVERY=\"true<\/span><\/span><\/span><\/code><\/pre>\n
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      \u7136\u540e\u8ba9\u5176\u751f\u6548\uff1a<\/p>\n
      # grub2-mkconfig -o \/boot\/grub2\/grub.cfg<\/span><\/code><\/pre>\n
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        \u6700\u540e\uff0creboot \u673a\u5668\u5373\u53ef\u3002<\/p>\n
        [root@mesos-slave-dev001-cqdx ~]# systemctl status kdump.service<\/span>\n\u25cf kdump.service<\/span> - Crash recovery kernel arming\n   Loaded: loaded (\/usr\/lib\/systemd\/system\/kdump.service<\/span>; enabled; vendor preset: enabled)<\/span>\n   Active: active (exited) since \u4e8c 2016<\/span>-07<\/span>-19<\/span> 14<\/span>:15<\/span>:16<\/span> CST; 14min ago<\/span>\n Main PID: 1082<\/span> (code=exited, status=0<\/span>\/SUCCESS)\n   Memory: 0<\/span>B\n   CGroup: \/system.slice<\/span>\/kdump.service<\/span>\n\n7<\/span>\u6708 19<\/span> 14<\/span>:15<\/span>:13<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> systemd[1<\/span>]: Starting Crash recovery kernel arming...\n7<\/span>\u6708 19<\/span> 14<\/span>:15<\/span>:16<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> kdumpctl[1082<\/span>]: kexec: loaded kdump kernel\n7<\/span>\u6708 19<\/span> 14<\/span>:15<\/span>:16<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> kdumpctl[1082<\/span>]: Starting kdump: [OK]\n7<\/span>\u6708 19<\/span> 14<\/span>:15<\/span>:16<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> systemd[1<\/span>]: Started Crash recovery kernel arming.\n7<\/span>\u6708 19<\/span> 14<\/span>:15<\/span>:19<\/span> mesos-slave-dev001-cqdx.qiyi<\/span>.virtual<\/span> systemd[1<\/span>]: Started Crash recovery kernel arming.<\/code><\/pre>\n
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          kdump \u662f\u4e00\u79cd kernel crash dump \u7684\u673a\u5236\uff0c\u5b83\u53ef\u4ee5\u5728\u5185\u6838 crash \u65f6\u4fdd\u5b58\u7cfb\u7edf\u7684\u5185\u5b58\u4fe1\u606f\u7528\u4e8e\u540e\u7eed\u7684\u5206\u6790\u3002kdump \u662f\u57fa\u4e8e kexec \u7684\u3002 crash \u662f\u4e00\u4e2a\u7528\u4e8e\u4ea4\u4e92\u5f0f\u5730\u5206\u6790\u6b63\u5728\u8fd0\u884c\u7684 Linux \u7cfb\u7edf\u6216\u8005 kernel crash \u540e\u7684 core dump […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-731","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.jsjs.org\/index.php?rest_route=\/wp\/v2\/posts\/731","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.jsjs.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.jsjs.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.jsjs.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.jsjs.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=731"}],"version-history":[{"count":0,"href":"https:\/\/blog.jsjs.org\/index.php?rest_route=\/wp\/v2\/posts\/731\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.jsjs.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.jsjs.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.jsjs.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}