{"id":162,"date":"2024-03-02T13:15:38","date_gmt":"2024-03-02T13:15:38","guid":{"rendered":"https:\/\/blog.devops955.com\/swain\/?p=162"},"modified":"2024-03-06T13:22:01","modified_gmt":"2024-03-06T13:22:01","slug":"ubuntu-20-04-enable-swap","status":"publish","type":"post","link":"https:\/\/blog.devops955.com\/swain\/zh\/2024\/03\/02\/ubuntu-20-04-enable-swap\/","title":{"rendered":"Ubuntu 20.04 \u5f00\u542fSWAP\u5206\u533a\u65b9\u6cd5"},"content":{"rendered":"
\n

\u5927\u6982\u9605\u8bfb\u65f6\u95f46\u5206\u949f<\/p>\n<\/blockquote>\n

\u4ec0\u4e48\u662fSWAP\u5206\u533a<\/h1>\n
\n

\u5199\u8fd9\u7bc7\u7b14\u8bb0\u7684\u76ee\u7684\u662f\u56e0\u4e3a\u524d\u4e0d\u4e45\u642d\u5efa\u7684\u8fd9\u4e2ablog\u56e0\u4e3a\u4fee\u6539\u4e3b\u9898\u9884\u89c8\u65f6\u5d29\u6389\u4e86\u3002\u3002\u3002<\/p>\n<\/blockquote>\n

\u9996\u5148\u6211\u4eec\u77e5\u9053Linux\u5185\u6838\u4e3a\u4e86\u63d0\u9ad8\u8bfb\u5199\u6548\u7387\u4e0e\u901f\u5ea6\uff0c\u4f1a\u5c06\u6587\u4ef6\u5728\u5185\u5b58\u4e2d\u8fdb\u884c\u7f13\u5b58\uff0c\u8fd9\u90e8\u5206\u5185\u5b58\u5c31\u662fCache Memory\u3002<\/p>\n

\u800cSwap<\/strong>\u4e5f\u53eb\u4ea4\u6362\u7a7a\u95f4\uff0c\u76f8\u5f53\u4e8e\u662f\u4e00\u4e2a\u865a\u62df\u5185\u5b58\u3002\u7cfb\u7edf\u4e3a\u4e86\u5e94\u4ed8\u4e00\u4e9b\u9700\u8981\u5927\u91cf\u5185\u5b58\u7684\u5e94\u7528\uff0c\u800c\u5c06\u78c1\u76d8\u4e0a\u7684\u4e00\u90e8\u5206\u7a7a\u95f4\u5f53\u505a\u5185\u5b58\u4f7f\u7528\uff0c\u5f53\u7269\u7406\u5185\u5b58\u4e0d\u591f\u7528\u65f6\uff0c\u5c31\u9700\u8981\u5c06\u5176\u4e2d\u4e00\u4e9b\u6570\u636e\u4ea4\u6362\u5230\u4ea4\u6362\u7a7a\u95f4\u3002<\/p>\n

\u4e0d\u8fc7\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b83\u8981\u6bd4\u7269\u7406\u5185\u5b58\u7684\u8bfb\u5199\u901f\u5ea6\u66f4\u6162\uff0c\u4e00\u822c\u7684\u5efa\u8bae\u5927\u5c0f\u4e3a\u7269\u7406\u5185\u5b58\u76842\u500d\uff08\u5982\u679c\u7269\u7406\u5185\u5b58\u8db3\u591f\u5927\u5c31\u4e0d\u7528\u5f00\u542fSWAP\u4e86\uff09\u3002<\/p>\n

\u5f00\u542f\u6b65\u9aa4<\/h1>\n
\n

\u5982\u679c\u4f60\u5728\u5b89\u88c5\u8fc7\u7a0b\u4e2d\u5c31\u5f00\u542f\u9009\u62e9\u4e86SWAP\u5206\u533a\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u8df3\u8fc7\u8fd9\u4e2a\u7b14\u8bb0\u4e86\u3002<\/p>\n<\/blockquote>\n

\u56e0\u4e3a\u6211\u4f7f\u7528\u7684\u4e91\u4e3b\u673a\u521b\u5efa\u65f6\u5e76\u6ca1\u6709\u5f00\u542fSWAP\uff0c\u6240\u4ee5\u9700\u8981\u624b\u52a8\u8bbe\u7f6e\u5e76\u542f\u7528\u5206\u533a\uff0c\u907f\u514d\u56e0\u4e3a\u5185\u5b58\u4e0d\u8db3\u800c\u9020\u6210\u5404\u79cd\u95ee\u9898\u3002<\/p>\n

    \n
  1. \n

    \u521b\u5efa\u4e00\u4e2aswap\u6587\u4ef6
    \n\u53ef\u4ee5\u4f7f\u7528fallocate<\/strong>\u6216\u8005dd<\/strong>\u5de5\u5177\u6765\u5b8c\u6210\uff1a<\/p>\n

    sudo fallocate -l 2G \/swap<\/code><\/pre>\n
    sudo dd if=\/dev\/zero of=\/swap bs=1M count=2048<\/code><\/pre>\n<\/li>\n
  2. \n
    \u8bbe\u7f6e\u8bfb\u5199\u6743\u9650
    \n\u51fa\u4e8e\u5b89\u5168\u8003\u8651\uff0cswap\u6587\u4ef6\u5e94\u8be5\u53ea\u80fd\u88abroot\u7528\u6237\u8bfb\u5199\u3002\u6240\u4ee5\u4fee\u6539\u4e00\u4e0b\u6743\u9650\uff1a<\/p>\n
    sudo chmod 600 \/swap<\/code><\/pre>\n<\/li>\n
  3. \n
    \u5c06swap\u6587\u4ef6\u521b\u5efa\u4e3aswap\u5206\u533a
    \n\u521b\u5efa\u4e86\u6587\u4ef6\u4e4b\u540e\uff0c\u7cfb\u7edf\u4ecd\u7136\u4e0d\u77e5\u9053\u4f7f\u7528\u4ed6\u4f5c\u4e3aswap\u7a7a\u95f4\uff0c\u6240\u4ee5\u8fdb\u884c\u4e0b\u9762\u8bbe\u7f6e\uff1a<\/p>\n
    sudo mkswap \/swap<\/code><\/pre>\n
    \u8bbe\u7f6e\u4e4b\u540e\uff0c\u542f\u7528SWAP\u5206\u533a\uff1a<\/p>\n
    sudo swapon \/swap<\/code><\/pre>\n<\/li>\n
  4. \n
    \u6839\u636e\u9700\u6c42\u8bbe\u7f6e\u4f7f\u7528SWAP\u7684\u503e\u5411
    \n\u7cfb\u7edf\u7684Swappiness\u53c2\u6570\u63a7\u5236\u4f7f\u7528swap\u7a7a\u95f4\u7684\u503e\u5411\u3002\u503c\u8303\u56f4\u4ece0\u5230100\uff0c\u8f83\u4f4e\u7684\u503c<\/strong>\u4f7f\u5f97\u5185\u6838\u66f4\u503e\u5411\u4e8e\u4f7f\u7528\u7269\u7406\u5185\u5b58<\/strong>\uff0c\u800c\u8f83\u9ad8\u7684\u503c<\/strong>\u4f7f\u5f97\u5185\u6838\u66f4\u503e\u5411\u4e8e\u4f7f\u7528swap\u7a7a\u95f4<\/strong>\u3002
    \n\u8fd9\u4e2a\u6839\u636e\u9700\u6c42\u786e\u8ba4\u662f\u5426\u8fdb\u884c\u8c03\u6574\uff0c\u9ed8\u8ba4\u4e3a60\uff1a<\/p>\n
    sudo sysctl vm.swappiness=20<\/code><\/pre>\n
    \u6dfb\u52a0\u5230\/etc\/sysctl.conf\u6587\u4ef6\u4e2d\u4ee5\u786e\u4fdd\u6c38\u4e45\u751f\u6548\uff1a<\/p>\n
    echo 'vm.swappiness=20' | sudo tee -a \/etc\/sysctl.conf<\/code><\/pre>\n<\/li>\n
  5. \n
    \u8bbe\u7f6eSWAP\u5206\u533a\u6c38\u4e45\u6302\u8f7d\uff1a
    \n\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5f53\u7cfb\u7edf\u91cd\u542f\u65f6\uff0cswap\u4e0d\u4f1a\u81ea\u52a8\u542f\u7528\u3002\u8fd8\u9700\u8981\u7f16\u8f91\/etc\/fstab\u6587\u4ef6\u4f7f\u5176\u6c38\u4e45\u751f\u6548\uff08vim\u7f16\u8f91\u4e5f\u53ef\u4ee5\uff09\uff1a<\/p>\n
    echo '\/swap none swap sw 0 0' | sudo tee -a \/etc\/fstab<\/code><\/pre>\n<\/li>\n<\/ol>\n
    \u5b8c\u6210\u914d\u7f6e<\/h1>\n
    \u901a\u8fc7\u8fd9\u4e9b\u6b65\u9aa4\uff0c\u5e94\u8be5\u5df2\u7ecf\u6210\u529f\u5728Ubuntu 20.04\u7cfb\u7edf\u4e0a\u8bbe\u7f6e\u4e862GB\u7684swap\u5206\u533a\u3002\u5f53\u4f60\u4f7f\u7528free -h<\/code>\u547d\u4ee4\u65f6\uff0c\u5e94\u8be5\u53ef\u4ee5\u770b\u5230swap\u5206\u533a\u5df2\u7ecf\u542f\u7528\u4e86\u3002<\/p>\n
    \u5bf9\u4e8e\u8d44\u6e90\u7d27\u5f20\u5185\u5b58\u4f7f\u7528\u5b58\u5728\u538b\u529b\u65f6\uff0c\u53ef\u4ee5\u5f00\u542fswap\u6765\u9876\u4f4f\u538b\u529b\uff0c\u4fdd\u8bc1\u7cfb\u7edf\u80fd\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5927\u6982\u9605\u8bfb\u65f6\u95f46\u5206\u949f \u4ec0\u4e48\u662fSWAP\u5206\u533a \u5199\u8fd9\u7bc7\u7b14\u8bb0\u7684\u76ee\u7684\u662f\u56e0\u4e3a\u524d\u4e0d\u4e45\u642d\u5efa\u7684\u8fd9\u4e2ablog\u56e0\u4e3a\u4fee\u6539\u4e3b\u9898\u9884\u89c8\u65f6\u5d29\u6389\u4e86\u3002\u3002\u3002 \u9996\u5148\u6211\u4eec\u77e5\u9053Linux\u5185\u6838\u4e3a\u4e86\u63d0\u9ad8\u8bfb\u5199\u6548\u7387\u4e0e\u901f\u5ea6\uff0c\u4f1a\u5c06\u6587\u4ef6\u5728\u5185\u5b58\u4e2d\u8fdb\u884c\u7f13\u5b58\uff0c\u8fd9\u90e8\u5206\u5185\u5b58\u5c31\u662fCache Memory\u3002 \u800cSwap\u4e5f\u53eb\u4ea4\u6362\u7a7a\u95f4\uff0c\u76f8\u5f53\u4e8e\u662f\u4e00\u4e2a\u865a\u62df\u5185\u5b58\u3002\u7cfb\u7edf\u4e3a\u4e86\u5e94\u4ed8\u4e00\u4e9b\u9700\u8981\u5927\u91cf\u5185\u5b58\u7684\u5e94\u7528\uff0c\u800c\u5c06\u78c1\u76d8\u4e0a\u7684\u4e00\u90e8\u5206\u7a7a\u95f4\u5f53\u505a\u5185\u5b58\u4f7f\u7528\uff0c\u5f53\u7269\u7406\u5185\u5b58\u4e0d\u591f\u7528\u65f6\uff0c\u5c31\u9700\u8981\u5c06\u5176\u4e2d\u4e00\u4e9b\u6570\u636e\u4ea4\u6362\u5230\u4ea4\u6362\u7a7a\u95f4\u3002 \u4e0d\u8fc7\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b83\u8981\u6bd4\u7269\u7406\u5185\u5b58\u7684\u8bfb\u5199\u901f\u5ea6\u66f4\u6162\uff0c\u4e00\u822c\u7684\u5efa\u8bae\u5927\u5c0f\u4e3a\u7269\u7406\u5185\u5b58\u76842\u500d\uff08\u5982\u679c\u7269\u7406\u5185\u5b58\u8db3\u591f\u5927\u5c31\u4e0d\u7528\u5f00\u542fSWAP\u4e86\uff09\u3002 \u5f00\u542f\u6b65\u9aa4 \u5982\u679c\u4f60\u5728\u5b89\u88c5\u8fc7\u7a0b\u4e2d\u5c31\u5f00\u542f\u9009\u62e9\u4e86SWAP\u5206\u533a\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u8df3\u8fc7\u8fd9\u4e2a\u7b14\u8bb0\u4e86\u3002 \u56e0\u4e3a\u6211\u4f7f\u7528\u7684\u4e91\u4e3b\u673a\u521b\u5efa\u65f6\u5e76\u6ca1\u6709\u5f00\u542fSWAP\uff0c\u6240\u4ee5\u9700\u8981\u624b\u52a8\u8bbe\u7f6e\u5e76\u542f\u7528\u5206\u533a\uff0c\u907f\u514d\u56e0\u4e3a\u5185\u5b58\u4e0d\u8db3\u800c\u9020\u6210\u5404\u79cd\u95ee\u9898\u3002 \u521b\u5efa\u4e00\u4e2aswap\u6587\u4ef6 \u53ef\u4ee5\u4f7f\u7528fallocate\u6216\u8005dd\u5de5\u5177\u6765\u5b8c\u6210\uff1a sudo fallocate -l 2G \/swap sudo dd if=\/dev\/zero of=\/swap bs=1M count=2048 \u8bbe\u7f6e\u8bfb\u5199\u6743\u9650 \u51fa\u4e8e\u5b89\u5168\u8003\u8651\uff0cswap\u6587\u4ef6\u5e94\u8be5\u53ea\u80fd\u88abroot\u7528\u6237\u8bfb\u5199\u3002\u6240\u4ee5\u4fee\u6539\u4e00\u4e0b\u6743\u9650\uff1a sudo chmod 600 \/swap \u5c06swap\u6587\u4ef6\u521b\u5efa\u4e3aswap\u5206\u533a \u521b\u5efa\u4e86\u6587\u4ef6\u4e4b\u540e\uff0c\u7cfb\u7edf\u4ecd\u7136\u4e0d\u77e5\u9053\u4f7f\u7528\u4ed6\u4f5c\u4e3aswap\u7a7a\u95f4\uff0c\u6240\u4ee5\u8fdb\u884c\u4e0b\u9762\u8bbe\u7f6e\uff1a sudo mkswap \/swap \u8bbe\u7f6e\u4e4b\u540e\uff0c\u542f\u7528SWAP\u5206\u533a\uff1a sudo swapon \/swap \u6839\u636e\u9700\u6c42\u8bbe\u7f6e\u4f7f\u7528SWAP\u7684\u503e\u5411 \u7cfb\u7edf\u7684Swappiness\u53c2\u6570\u63a7\u5236\u4f7f\u7528swap\u7a7a\u95f4\u7684\u503e\u5411\u3002\u503c\u8303\u56f4\u4ece0\u5230100\uff0c\u8f83\u4f4e\u7684\u503c\u4f7f\u5f97\u5185\u6838\u66f4\u503e\u5411\u4e8e\u4f7f\u7528\u7269\u7406\u5185\u5b58\uff0c\u800c\u8f83\u9ad8\u7684\u503c\u4f7f\u5f97\u5185\u6838\u66f4\u503e\u5411\u4e8e\u4f7f\u7528swap\u7a7a\u95f4\u3002 \u8fd9\u4e2a\u6839\u636e\u9700\u6c42\u786e\u8ba4\u662f\u5426\u8fdb\u884c\u8c03\u6574\uff0c\u9ed8\u8ba4\u4e3a60\uff1a sudo sysctl vm.swappiness=20 \u6dfb\u52a0\u5230\/etc\/sysctl.conf\u6587\u4ef6\u4e2d\u4ee5\u786e\u4fdd\u6c38\u4e45\u751f\u6548\uff1a echo 'vm.swappiness=20' | sudo tee -a \/etc\/sysctl.conf \u8bbe\u7f6eSWAP\u5206\u533a\u6c38\u4e45\u6302\u8f7d\uff1a \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5f53\u7cfb\u7edf\u91cd\u542f\u65f6\uff0cswap\u4e0d\u4f1a\u81ea\u52a8\u542f\u7528\u3002\u8fd8\u9700\u8981\u7f16\u8f91\/etc\/fstab\u6587\u4ef6\u4f7f\u5176\u6c38\u4e45\u751f\u6548\uff08vim\u7f16\u8f91\u4e5f\u53ef\u4ee5\uff09\uff1a echo…<\/p>\n","protected":false},"author":3,"featured_media":169,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[27],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/blog.devops955.com\/swain\/wp-content\/uploads\/sites\/2\/2024\/03\/Ubuntu-1404-.jpg","_links":{"self":[{"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/posts\/162"}],"collection":[{"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/comments?post=162"}],"version-history":[{"count":12,"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/posts\/162\/revisions"}],"predecessor-version":[{"id":215,"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/posts\/162\/revisions\/215"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/media\/169"}],"wp:attachment":[{"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/media?parent=162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/categories?post=162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.devops955.com\/swain\/wp-json\/wp\/v2\/tags?post=162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}