{"id":2706,"date":"2017-09-22T12:09:34","date_gmt":"2017-09-22T04:09:34","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=2706"},"modified":"2025-01-20T11:19:24","modified_gmt":"2025-01-20T03:19:24","slug":"centos-7%e4%b8%8a%e6%b7%bb%e5%8a%a0swap%e4%ba%a4%e6%8d%a2%e7%a9%ba%e9%97%b4","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/jishu\/centos-7%e4%b8%8a%e6%b7%bb%e5%8a%a0swap%e4%ba%a4%e6%8d%a2%e7%a9%ba%e9%97%b4\/","title":{"rendered":"CentOS 7\u4e0a\u6dfb\u52a0Swap\u4ea4\u6362\u7a7a\u95f4"},"content":{"rendered":"

\u524d\u8a00<\/h3>\n

\u5982\u4f55\u8ba9\u670d\u52a1\u5668\u54cd\u5e94\u66f4\u5feb\uff1f\u5982\u4f55\u907f\u514d\u5e94\u7528\u51fa\u73b0\u5185\u5b58\u4e0d\u8db3\u7684\u9519\u8bef\uff1f\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u5c31\u662f\u589e\u52a0\u4ea4\u6362\u7a7a\u95f4\u3002Swap\u662f\u5b58\u50a8\u76d8\u4e0a\u7684\u4e00\u5757\u81ea\u7559\u5730\uff0c\u64cd\u4f5c\u7cfb\u7edf\u53ef\u4ee5\u5728\u8fd9\u91cc\u6682\u5b58\u4e00\u4e9b\u5185\u5b58\u91cc\u653e\u4e0d\u4e0b\u7684\u4e1c\u897f\u3002<\/p>\n

\u8fd9\u4ece\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u76f8\u5f53\u4e8e\u589e\u52a0\u4e86\u670d\u52a1\u5668\u7684\u53ef\u7528\u5185\u5b58\u3002\u867d\u7136\u4eceswap\u8bfb\u5199\u6bd4\u5185\u5b58\u6162\uff0c\u4f46\u603b\u6bd4\u6ca1\u6709\u597d\uff0c\u7b97\u662f\u5185\u5b58\u4e0d\u591f\u65f6\u7684\u5b89\u5168\u7f51\u3002<\/p>\n

\u5982\u679c\u6ca1\u6709swap\uff0c\u5219\u670d\u52a1\u5668\u4e00\u65e6\u5185\u5b58\u4e0d\u8db3\uff0c\u5c31\u4f1a\u5f00\u59cb\u7ec8\u6b62\u5e94\u7528\u4ee5\u91ca\u653e\u5185\u5b58\uff0c\u751a\u81f3\u4f1a\u5d29\u6e83\uff0c\u8fd9\u4f1a\u8ba9\u4f60\u4e22\u5931\u4e00\u4e9b\u8fd8\u6ca1\u6765\u5f97\u53ca\u4fdd\u5b58\u7684\u6570\u636e\uff0c\u6216\u8005\u9020\u6210\u5f53\u673a\u3002\u6709\u4e9b\u5e94\u7528\u660e\u786e\u8981\u6c42\u7cfb\u7edf\u914d\u7f6eswap\u4ee5\u786e\u4fdd\u6570\u636e\u8bbf\u95ee\u7684\u53ef\u9760\u6027\u3002<\/p>\n

\u672c\u6587\u4ecb\u7ecd\u5982\u4f55\u5728CentOS 7\u670d\u52a1\u5668\u4e0a\u521b\u5efa\u5e76\u542f\u7528swap\u6587\u4ef6\u3002<\/p>\n

\u6ce8\uff1aswap\u901a\u5e38\u5728\u4f20\u7edf\u673a\u68b0\u786c\u76d8\u4e0a\u8868\u73b0\u66f4\u597d\uff0c\u5728SSD\u4e0a\u4f7f\u7528swap\u53ef\u80fd\u4f1a\u9020\u6210\u95ee\u9898\uff0c\u5c24\u5176\u662f\u786c\u4ef6\u8001\u5316\u4e4b\u540e\u3002\u6240\u4ee5\uff0c\u5bf9\u4e8eDigitalOcean\u4ee5\u53ca\u5176\u4ed6\u4f7f\u7528\u57fa\u4e8eSSD\u7684\u4e91\u4e3b\u673a\u670d\u52a1\u7684\u7528\u6237\uff0c\u6211\u4eec\u4e0d\u63a8\u8350\u542f\u7528swap\u3002\u8fd9\u751a\u81f3\u4f1a\u5f71\u54cd\u5230\u8ddf\u4f60\u7684\u865a\u62df\u673a\u5171\u7528\u5bbf\u4e3b\u673a\u7684\u5176\u4ed6\u7528\u6237\u3002<\/p>\n

\u5bf9\u4e8eDigitalOcean\u7528\u6237\uff0c\u63d0\u5347\u6027\u80fd\u7684\u6700\u4f73\u65b9\u6cd5\u5c31\u662f\u66f4\u65b0Droplet\u3002\u901a\u5e38\u6765\u8bf4\uff0c\u5347\u7ea7\u540e\u7684\u4e3b\u673a\u8868\u73b0\u90fd\u4f1a\u6709\u6240\u63d0\u5347\uff0c\u5e76\u4e14\u66f4\u4e0d\u5bb9\u6613\u53d7\u5230\u786c\u4ef6\u95ee\u9898\u7684\u5f71\u54cd\u3002<\/p>\n

<\/a>\u51c6\u5907\u5de5\u4f5c<\/h2>\n

\u9996\u5148\uff0c\u4f60\u9700\u8981\u4e00\u53f0CentOS 7\u670d\u52a1\u5668\uff0c\u914d\u7f6e\u8fc7\u5177\u5907sudo<\/code>\u6743\u9650\u7684\u975eroot\u7528\u6237\uff08\u914d\u7f6e\u8fc7\u7a0b\u53ef\u53c2\u8003\u8fd9\u4e2a\u6559\u7a0b<\/a>\u7684\u7b2c\u4e00\u5230\u7b2c\u56db\u6b65\u9aa4\uff09\u3002<\/p>\n

\u51c6\u5907\u5c31\u7eea\u540e\uff0c\u4ee5\u8be5\u7528\u6237\u540dSSH\u5230\u4f60\u7684CentOS\u670d\u52a1\u5668\u4e0a\uff0c\u51c6\u5907\u5b89\u88c5swap\u6587\u4ef6\u3002<\/p>\n

<\/a>\u68c0\u67e5\u7cfb\u7edf\u7684Swap\u4fe1\u606f<\/h2>\n

\u9996\u5148\u6211\u4eec\u9700\u8981\u68c0\u67e5\u7cfb\u7edf\u7684\u5b58\u50a8\uff0c\u770b\u770b\u662f\u5426\u5df2\u7ecf\u914d\u7f6e\u8fc7swap\u3002\u4e00\u4e2a\u7cfb\u7edf\u53ef\u4ee5\u8bbe\u7f6e\u591a\u4e2aswap\u6587\u4ef6\u6216\u5206\u533a\uff0c\u4e0d\u8fc7\u4e00\u822c\u6765\u8bf4\u4e00\u4e2a\u5c31\u591f\u4e86\u3002<\/p>\n

\u4f7f\u7528swapon<\/code>\u547d\u4ee4\u53ef\u4ee5\u68c0\u67e5\u7cfb\u7edf\u662f\u5426\u5df2\u7ecf\u914d\u7f6e\u8fc7swap\uff0c\u8fd9\u662f\u4e00\u4e2a\u901a\u7528\u7684swap\u5de5\u5177\u3002\u4f7f\u7528-s<\/code>\u6807\u7b7e\u53ef\u5217\u51fa\u5f53\u524d\u5b58\u50a8\u8bbe\u5907\u4e0a\u7684swap\u4f7f\u7528\u60c5\u51b5\uff1a<\/p>\n

swapon -s\n<\/code><\/pre>\n
\u5982\u679c\u8be5\u547d\u4ee4\u6ca1\u6709\u8fd4\u56de\u51fa\u7ed3\u679c\uff0c\u5219\u4ee3\u8868\u8be5\u7cfb\u7edf\u5c1a\u672a\u914d\u7f6e\u8fc7swap\u3002<\/p>\n
\u6216\u8005\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u4f7f\u7528free<\/code>\u5de5\u5177\u6765\u67e5\u770b\u7cfb\u7edf\u7684\u6574\u4f53\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c\u8fd9\u91cc\u53ef\u4ee5\u770b\u5230\u5185\u5b58\u548cswap\u7684\u4f7f\u7528\u72b6\u6001\uff08\u663e\u793a\u5355\u4f4d\u4e3aMB\uff09\uff1a<\/p>\n
free -m\n\n\n             total       used       free     shared    buffers     cached\nMem:          3953        315       3637          8         11        107\n-\/+ buffers\/cache:        196       3756\nSwap:            0          0       4095\n<\/code><\/pre>\n
\u8fd9\u91cc\u53ef\u4ee5\u770b\u5230\u6211\u4eec\u8fd9\u4e2a\u7cfb\u7edf\u7684total swap\u7a7a\u95f4\u4e3a0\uff0c\u5373\u6ca1\u6709\u914d\u7f6e\u8fc7swap\u3002\u8fd9\u4e0e\u6211\u4eec\u5728swapon<\/code>\u91cc\u770b\u5230\u7684\u7ed3\u679c\u76f8\u7b26\u5408\u3002<\/p>\n
<\/a>\u68c0\u67e5\u53ef\u7528\u7684\u5b58\u50a8\u7a7a\u95f4<\/h2>\n
\u901a\u5e38\uff0c\u6211\u4eec\u5efa\u7acb\u4e00\u4e2a\u5355\u72ec\u7684\u5206\u533a\u4f5c\u4e3aswap\u3002\u7136\u800c\u6709\u65f6\u5019\u7531\u4e8e\u786c\u4ef6\u6216\u8f6f\u4ef6\u7684\u9650\u5236\uff0c\u65b0\u5efa\u5206\u533a\u7684\u65b9\u5f0f\u65e0\u6cd5\u5b9e\u73b0\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5c31\u53ef\u4ee5\u5efa\u7acb\u4e00\u4e2aswap\u6587\u4ef6\u6765\u5b9e\u73b0\u540c\u6837\u7684\u529f\u80fd\u3002<\/p>\n
\u5f00\u59cb\u4e4b\u524d\uff0c\u5148\u68c0\u67e5\u4e00\u4e0b\u78c1\u76d8\u7684\u53ef\u7528\u7a7a\u95f4\u3002\u8f93\u5165\u5982\u4e0b\u6307\u4ee4\uff1a<\/p>\n
df -h\n\n\nFilesystem      Size  Used Avail Use% Mounted on\n\/dev\/vda1        59G  1.5G   55G   3% \/\ndevtmpfs        2.0G     0  2.0G   0% \/dev\ntmpfs           2.0G     0  2.0G   0% \/dev\/shm\ntmpfs           2.0G  8.3M  2.0G   1% \/run\ntmpfs           2.0G     0  2.0G   0% \/sys\/fs\/cgroup\n<\/code><\/pre>\n
\u8fd9\u91cc\u7684-h<\/code>\u6807\u8bb0\u662f\u4e3a\u4e86\u544a\u8bc9dh<\/code>\u5c06\u4fe1\u606f\u8f93\u51fa\u4e3a\u5bf9\u4eba\u7c7b\u53cb\u597d\u7684\u683c\u5f0f\uff0c\u6bd4\u5982\u4ee5MB\u6216GB\u4e3a\u5355\u4f4d\u8f93\u51fa\u7a7a\u95f4\u4f7f\u7528\u548c\u7a7a\u4f59\u60c5\u51b5\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u8f93\u51fa\u5185\u5b58\u5757\u7684\u4e2a\u6570\u3002<\/p>\n
\u4ece\u7b2c\u4e00\u884c\u53ef\u4ee5\u770b\u5230\u6211\u4eec\u7684\u5b58\u50a8\u5206\u533a\u4e0a\u8fd8\u670959GB\u7684\u7a7a\u95f4\u5269\u4f59\uff0c\u8fd9\u8db3\u591f\u6211\u4eec\u64cd\u4f5c\u4e86\u3002\uff08\u6211\u8fd9\u662f\u4e00\u53f0\u4e2d\u7b49\u89c4\u6a21\u7684\u65b0\u5efa\u4e91\u4e3b\u673a\uff0c\u6bcf\u4e2a\u4eba\u7684\u60c5\u51b5\u53ef\u80fd\u6709\u5f88\u5927\u4e0d\u540c\u3002\uff09<\/p>\n
\u5408\u9002\u7684swap\u7a7a\u95f4\u662f\u591a\u5927\uff1f\u5173\u4e8e\u8fd9\u4e2a\u95ee\u9898\u6709\u5f88\u591a\u79cd\u9009\u62e9\uff0c\u8fd9\u53d6\u51b3\u4e8e\u4f60\u7684\u5e94\u7528\u9700\u6c42\u548c\u4f60\u4e2a\u4eba\u7684\u504f\u597d\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u5185\u5b58\u5bb9\u91cf\u7684\u4e24\u500d\u5c31\u662f\u4e2a\u4e0d\u9519\u7684\u8d77\u70b9\u3002<\/p>\n
\u6211\u7684\u7cfb\u7edf\u5185\u5b58\u67094GB\uff0c\u5982\u679c\u8bbe\u7f6e8GB\u7684swap\u4f1a\u5360\u636e\u592a\u591a\u7a7a\u95f4\uff0c\u6240\u4ee5\u6211\u51b3\u5b9a\u53ea\u8bbe\u7f6e4GB\u5c31\u597d\u3002<\/p>\n
<\/a>\u521b\u5efaSwap\u6587\u4ef6<\/h2>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u5728\u6587\u4ef6\u7cfb\u7edf\u4e0a\u521b\u5efaswap\u6587\u4ef6\u3002\u6211\u4eec\u8981\u5728\u6839\u76ee\u5f55\uff08\/<\/code>\uff09\u4e0b\u521b\u5efa\u4e00\u4e2a\u540d\u53ebswapfile<\/code>\u7684\u6587\u4ef6\uff0c\u5f53\u7136\u4f60\u4e5f\u53ef\u4ee5\u9009\u62e9\u4f60\u559c\u6b22\u7684\u6587\u4ef6\u540d\u3002\u8be5\u6587\u4ef6\u5206\u914d\u7684\u7a7a\u95f4\u5c06\u7b49\u4e8e\u6211\u4eec\u9700\u8981\u7684swap\u7a7a\u95f4\u3002<\/p>\n
\u6700\u5feb\u6377\u7684\u521b\u5efa\u65b9\u5f0f\u662ffallocate<\/code>\u547d\u4ee4\uff0c\u8be5\u547d\u4ee4\u80fd\u591f\u521b\u5efa\u4e00\u4e2a\u9884\u5206\u914d\u6307\u5b9a\u5927\u5c0f\u7a7a\u95f4\u7684\u6587\u4ef6\u3002\u8f93\u5165\u5982\u4e0b\u6307\u4ee4\u521b\u5efa\u4e00\u4e2a4GB\u7684\u6587\u4ef6\uff1a<\/p>\n
sudo fallocate -l 4G \/swapfile\n<\/code><\/pre>\n
\u8f93\u5165\u5bc6\u7801\u540e\uff0c\u8be5swap\u6587\u4ef6\u5c06\u7acb\u5373\u521b\u5efa\u5b8c\u6bd5\u3002\u6211\u4eec\u53ef\u4ee5\u7528ls<\/code>\u547d\u4ee4\u68c0\u67e5\u6587\u4ef6\u5927\u5c0f\uff1a<\/p>\n
ls -lh \/swapfile\n\n\n-rw-r--r-- 1 root root 4.0G Oct 30 11:00 \/swapfile\n<\/code><\/pre>\n
\u81f3\u6b64\uff0c\u6211\u4eec\u7684swap\u6587\u4ef6\u5c31\u521b\u5efa\u5b8c\u6bd5\u4e86\u3002<\/p>\n
<\/a>\u542f\u7528Swap\u6587\u4ef6<\/h2>\n
\u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u6709\u4e86swap\u6587\u4ef6\uff0c\u4f46\u7cfb\u7edf\u8fd8\u4e0d\u77e5\u9053\u5e94\u8be5\u4f7f\u7528\u8be5\u6587\u4ef6\u4f5c\u4e3aswap\uff0c\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u544a\u77e5\u7cfb\u7edf\u5c06\u8be5\u6587\u4ef6\u683c\u5f0f\u5316\u4e3aswap\u5e76\u542f\u7528\u8d77\u6765\u3002<\/p>\n
\u9996\u5148\u6211\u4eec\u9700\u8981\u66f4\u6539swap\u6587\u4ef6\u7684\u6743\u9650\uff0c\u786e\u4fdd\u53ea\u6709root\u624d\u53ef\u8bfb\uff0c\u5426\u5219\u4f1a\u6709\u5f88\u5927\u7684\u5b89\u5168\u9690\u60a3\u3002\u4f7f\u7528chmod<\/code>\u547d\u4ee4\u8fdb\u884c\u6743\u9650\u64cd\u4f5c\uff1a<\/p>\n
sudo chmod 600 \/swapfile\n<\/code><\/pre>\n
\u5982\u6b64\uff0c\u8be5\u6587\u4ef6\u7684\u8bfb\u5199\u90fd\u53ea\u6709root\u624d\u80fd\u64cd\u4f5c\u3002\u4f7f\u7528ls -lh<\/code>\u547d\u4ee4\u68c0\u67e5\u4e00\u4e0b\uff1a<\/p>\n
ls -lh \/swapfile\n\n\n-rw------- 1 root root 4.0G Oct 30 11:00 \/swapfile\n<\/code><\/pre>\n
\u7136\u540e\uff0c\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\u544a\u77e5\u7cfb\u7edf\u5c06\u8be5\u6587\u4ef6\u7528\u4e8eswap\uff1a<\/p>\n
sudo mkswap \/swapfile\n\n\nSetting up swapspace version 1, size = 4194300 KiB\nno label, UUID=b99230bb-21af-47bc-8c37-de41129c39bf\n<\/code><\/pre>\n
\u73b0\u5728\uff0c\u8fd9\u4e2aswap\u6587\u4ef6\u5c31\u53ef\u4ee5\u4f5c\u4e3aswap\u7a7a\u95f4\u4f7f\u7528\u4e86\u3002\u8f93\u5165\u5982\u4e0b\u547d\u4ee4\u5f00\u59cb\u4f7f\u7528\u8be5swap\uff1a<\/p>\n
sudo swapon \/swapfile\n<\/code><\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u8f93\u5165\u5982\u4e0b\u547d\u4ee4\u6765\u786e\u8ba4\u4e00\u4e0b\u8bbe\u7f6e\u662f\u5426\u5df2\u7ecf\u751f\u6548\uff1a<\/p>\n
swapon -s\n\n\nFilename                Type        Size    Used    Priority\n\/swapfile               file        4194300 0     -1\n<\/code><\/pre>\n
\u53ef\u4ee5\u770b\u5230\u8fd4\u56de\u7684\u7ed3\u679c\u4e2d\u5df2\u7ecf\u6709\u6211\u4eec\u521a\u624d\u8bbe\u7f6e\u7684swap\u3002\u518d\u4f7f\u7528free<\/code>\u5de5\u5177\u786e\u8ba4\u4e00\u4e0b\uff1a<\/p>\n
free -m\n\n\n             total       used       free     shared    buffers     cached\nMem:          3953        315       3637          8         11        107\n-\/+ buffers\/cache:        196       3756\nSwap:         4095          0       4095\n<\/code><\/pre>\n
\u81f3\u6b64\uff0c\u6211\u4eec\u7684swap\u5df2\u7ecf\u8bbe\u7f6e\u5b8c\u6bd5\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u5728\u9700\u8981\u7684\u65f6\u5019\u4f7f\u7528\u5b83\u3002<\/p>\n
<\/a>\u4f7fSwap\u6587\u4ef6\u6c38\u4e45\u751f\u6548<\/h2>\n
\u81f3\u6b64\u6211\u4eec\u5df2\u7ecf\u5728\u7cfb\u7edf\u4e2d\u542f\u7528\u4e86swap\u6587\u4ef6\uff0c\u7136\u800c\u4e00\u65e6\u7cfb\u7edf\u91cd\u542f\u540e\uff0c\u670d\u52a1\u5668\u8fd8\u4e0d\u80fd\u81ea\u52a8\u542f\u7528\u8be5\u6587\u4ef6\u3002\u8981\u8ba9\u7cfb\u7edf\u5728\u91cd\u542f\u540e\u81ea\u52a8\u751f\u6548swap\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539fstab<\/code>\u6587\u4ef6\u6765\u5b9e\u73b0\uff08\u8fd9\u662f\u4e00\u4e2a\u7ba1\u7406\u6587\u4ef6\u7cfb\u7edf\u548c\u5206\u533a\u7684\u8868\uff09\u3002<\/p>\n
\u7528sudo<\/code>\u6743\u9650\u6253\u5f00\u8be5\u6587\u4ef6\u7f16\u8f91\uff1a<\/p>\n
sudo nano \/etc\/fstab\n<\/code><\/pre>\n
\u5728\u6587\u4ef6\u672b\u5c3e\u52a0\u5165\u4e0b\u9762\u8fd9\u884c\u5185\u5bb9\uff0c\u544a\u8bc9\u64cd\u4f5c\u7cfb\u7edf\u81ea\u52a8\u4f7f\u7528\u521a\u624d\u521b\u5efa\u7684swap\u6587\u4ef6\uff1a<\/p>\n
\/swapfile   swap    swap    sw  0   0\n<\/code><\/pre>\n
\u6dfb\u52a0\u5b8c\u6bd5\u540e\uff0c\u4fdd\u5b58\u9000\u51fa\u3002\u4ee5\u540e\u670d\u52a1\u5668\u6bcf\u6b21\u91cd\u542f\u90fd\u4f1a\u68c0\u67e5\u8be5\u6587\u4ef6\u5e76\u81ea\u52a8\u542f\u7528swap\u3002<\/p>\n
<\/a>\u66f4\u6539Swap\u914d\u7f6e\uff08\u53ef\u9009\uff09<\/h2>\n
\u6709\u51e0\u4e2a\u6d89\u53caswap\u7684\u9009\u9879\u53ef\u80fd\u4f1a\u5f71\u54cd\u5230\u7cfb\u7edf\u7684\u6027\u80fd\u8868\u73b0\u3002\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\u8fd9\u4e9b\u9009\u9879\u662f\u53ef\u9009\u7684\uff0c\u5177\u4f53\u8981\u4fee\u6539\u6210\u4ec0\u4e48\u6837\u5219\u53d6\u51b3\u4e8e\u4f60\u7684\u5e94\u7528\u9700\u6c42\u4ee5\u53ca\u4e2a\u4eba\u504f\u597d\u3002<\/p>\n
<\/a>Swappiness<\/h3>\n
swappiness<\/code>\u53c2\u6570\u51b3\u5b9a\u4e86\u7cfb\u7edf\u5c06\u6570\u636e\u4ece\u5185\u5b58\u4ea4\u6362\u5230swap\u7a7a\u95f4\u7684\u9891\u7387\uff0c\u6570\u503c\u8bbe\u7f6e\u57280\u5230100\u4e4b\u95f4\uff0c\u4ee3\u8868\u7cfb\u7edf\u5c06\u6570\u636e\u4ece\u5185\u5b58\u4ea4\u6362\u5230swap\u7a7a\u95f4\u7684\u529b\u5ea6\u3002<\/p>\n
\u8be5\u6570\u503c\u8d8a\u63a5\u8fd1\u4e8e0\uff0c\u7cfb\u7edf\u8d8a\u503e\u5411\u4e8e\u4e0d\u8fdb\u884cswap\uff0c\u4ec5\u5728\u5fc5\u8981\u7684\u65f6\u5019\u8fdb\u884cswap\u64cd\u4f5c\u3002\u7531\u4e8eswap\u8981\u6bd4\u5185\u5b58\u6162\u5f88\u591a\uff0c\u56e0\u6b64\u51cf\u5c11\u5bf9swap\u7684\u4f9d\u8d56\u610f\u5473\u7740\u66f4\u9ad8\u7684\u7cfb\u7edf\u6027\u80fd\u3002<\/p>\n
\u8be5\u6570\u503c\u8d8a\u63a5\u8fd1\u4e8e100\uff0c\u7cfb\u7edf\u8d8a\u503e\u5411\u4e8e\u591a\u8fdb\u884cswap\u3002\u6709\u4e9b\u5e94\u7528\u7684\u5185\u5b58\u4f7f\u7528\u4e60\u60ef\u66f4\u9002\u5408\u4e8e\u8fd9\u79cd\u60c5\u51b5\uff0c\u8fd9\u4e5f\u4e8e\u670d\u52a1\u5668\u7684\u7528\u9014\u6709\u5173\u3002<\/p>\n
\u8f93\u5165\u5982\u4e0b\u547d\u4ee4\u67e5\u770b\u5f53\u524d\u7684swappiness\u6570\u503c\uff1a<\/p>\n
cat \/proc\/sys\/vm\/swappiness\n\n\n30\n<\/code><\/pre>\n
CentOS 7\u9ed8\u8ba4\u8bbe\u7f6e\u4e8630\u7684swappiness\uff0c\u8fd9\u5bf9\u4e8e\u5927\u90e8\u5206\u684c\u9762\u7cfb\u7edf\u548c\u672c\u5730\u670d\u52a1\u5668\u662f\u6bd4\u8f83\u4e2d\u5eb8\u7684\u6570\u503c\u3002\u5bf9\u4e8eVPS\u7cfb\u7edf\u800c\u8a00\uff0c\u53ef\u80fd\u63a5\u8fd1\u4e8e0\u7684\u503c\u662f\u66f4\u52a0\u5408\u9002\u7684\u3002<\/p>\n
\u4f7f\u7528sysctl<\/code>\u547d\u4ee4\u53ef\u4ee5\u4fee\u6539swappiness\u3002\u6bd4\u5982\u5c06swappiness\u8bbe\u4e3a10\uff1a<\/p>\n
sudo sysctl vm.swappiness=10\n\n\nvm.swappiness = 10\n<\/code><\/pre>\n
\u672c\u6b21\u4fee\u6539\u5c06\u4e00\u76f4\u751f\u6548\u5230\u4e0b\u6b21\u91cd\u542f\u524d\u3002\u5982\u679c\u5e0c\u671b\u6c38\u4e45\u4fee\u6539\u8be5\u6570\u503c\uff0c\u5219\u9700\u8981\u7f16\u8f91sysctl<\/code>\u914d\u7f6e\u6587\u4ef6\uff1a<\/p>\n
sudo nano \/etc\/sysctl.conf\n<\/code><\/pre>\n
\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7c98\u8d34\u5230\u6587\u4ef6\u672b\u5c3e\uff1a<\/p>\n
vm.swappiness = 10\n<\/code><\/pre>\n
\u7f16\u8f91\u5b8c\u6210\u540e\uff0c\u4fdd\u5b58\u9000\u51fa\uff0c\u4e4b\u540e\u670d\u52a1\u5668\u6bcf\u6b21\u91cd\u542f\u7684\u65f6\u5019\u4f1a\u5c06swappiness\u8bbe\u7f6e\u4e3a\u8be5\u503c\u3002<\/p>\n
<\/a>\u7f13\u5b58\u538b\u529b\uff08Cache Pressure \uff09<\/h3>\n
\u53e6\u4e00\u4e2a\u53ef\u4ee5\u8003\u8651\u66f4\u6539\u7684\u914d\u7f6e\u9879\u662fvfs_cache_pressure<\/code>\uff0c\u8be5\u914d\u7f6e\u9879\u6d89\u53ca\u7279\u6b8a\u6587\u4ef6\u7cfb\u7edf\u5143\u6587\u4ef6\u6761\u76ee\u7684\u5b58\u50a8\u3002\u5bf9\u6b64\u7c7b\u4fe1\u606f\u7684\u9891\u7e41\u8bfb\u53d6\u662f\u975e\u5e38\u6d88\u8017\u6027\u80fd\u7684\uff0c\u6240\u4ee5\u5ef6\u957f\u5176\u5728\u7f13\u5b58\u7684\u4fdd\u5b58\u65f6\u95f4\u53ef\u4ee5\u63d0\u5347\u7cfb\u7edf\u7684\u6027\u80fd\u3002<\/p>\n
\u901a\u8fc7proc<\/code>\u6587\u4ef6\u7cfb\u7edf\u67e5\u770b\u7f13\u5b58\u538b\u529b\u7684\u5f53\u524d\u8bbe\u5b9a\u503c\uff1a<\/p>\n
cat \/proc\/sys\/vm\/vfs_cache_pressure\n\n\n100\n<\/code><\/pre>\n
\u8fd9\u4e2a\u6570\u503c\u662f\u6bd4\u8f83\u9ad8\u7684\uff0c\u610f\u5473\u7740\u7cfb\u7edf\u4ece\u7f13\u5b58\u4e2d\u79fb\u9664inode\u4fe1\u606f\u7684\u901f\u5ea6\u6bd4\u8f83\u5feb\u3002\u4e00\u4e2a\u4fdd\u5b88\u4e00\u4e9b\u7684\u6570\u503c\u662f50\uff0c\u4f7f\u7528sysctl<\/code>\u547d\u4ee4\u8fdb\u884c\u8bbe\u7f6e\uff1a<\/p>\n
sudo sysctl vm.vfs_cache_pressure=50\n\n\nvm.vfs_cache_pressure = 50\n<\/code><\/pre>\n
\u8fd9\u6761\u547d\u4ee4\u4ec5\u5728\u91cd\u542f\u524d\u6709\u6548\u3002\u8981\u8ba9\u8be5\u8bbe\u7f6e\u6c38\u4e45\u6709\u6548\uff0c\u9700\u8981\u7f16\u8f91sysctl<\/code>\u914d\u7f6e\u6587\u4ef6\uff1a<\/p>\n
sudo nano \/etc\/sysctl.conf\n<\/code><\/pre>\n
\u5728\u6587\u4ef6\u672b\u5c3e\u6dfb\u52a0\u5982\u4e0b\u5185\u5bb9\uff1a<\/p>\n
vm.vfs_cache_pressure = 50\n<\/code><\/pre>\n
\u4fdd\u5b58\u9000\u51fa\uff0c\u670d\u52a1\u5668\u5c31\u4f1a\u5728\u6bcf\u6b21\u91cd\u542f\u540e\u90fd\u81ea\u52a8\u5c06\u7f13\u5b58\u538b\u529b\u8bbe\u7f6e\u4e3a50\u4e86\u3002<\/p>\n
<\/a>\u603b\u7ed3<\/h2>\n
\u81f3\u6b64\uff0c\u6211\u4eec\u7684\u7cfb\u7edf\u5185\u5b58\u5c31\u83b7\u5f97\u4e86\u4e00\u4e9b\u5598\u6c14\u7684\u7a7a\u95f4\u3002\u6709\u4e86swap\u7a7a\u95f4\u53ef\u4ee5\u6709\u6548\u907f\u514d\u4e00\u4e9b\u5e38\u89c1\u7684\u95ee\u9898\u3002<\/p>\n
\u5982\u679c\u4f60\u4ecd\u7136\u4f1a\u9047\u5230\u5185\u5b58\u4e0d\u8db3\uff08OOM\uff0cout of memory\uff09\u7684\u9519\u8bef\u4fe1\u606f\uff0c\u6216\u8005\u4f60\u7684\u7cfb\u7edf\u4e0d\u80fd\u8fd0\u884c\u4f60\u9700\u8981\u7684\u5e94\u7528\uff0c\u90a3\u4e48\u6700\u597d\u7684\u65b9\u6cd5\u662f\u4f18\u5316\u4f60\u7684\u5e94\u7528\u914d\u7f6e\u6216\u8005\u5347\u7ea7\u4f60\u7684\u670d\u52a1\u5668\uff0c\u4e0d\u8fc7\u914d\u7f6eswap\u7a7a\u95f4\u4e5f\u4e0d\u5931\u4e3a\u4e00\u4e2a\u7075\u6d3b\u7684\u8282\u7701\u65b9\u6848\u3002<\/p>\n
\u672c\u6587\u6765\u6e90\u81eaDigitalOcean Community\u3002\u82f1\u6587\u539f\u6587\uff1aHow To Add Swap on CentOS 7\u00a0by\u00a0Josh Barnett<\/p>\n","protected":false},"excerpt":{"rendered":"
\u524d\u8a00 \u5982\u4f55\u8ba9\u670d\u52a1\u5668\u54cd\u5e94\u66f4\u5feb\uff1f\u5982\u4f55\u907f\u514d\u5e94\u7528\u51fa\u73b0\u5185\u5b58\u4e0d\u8db3\u7684\u9519\u8bef\uff1f\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u5c31\u662f\u589e\u52a0\u4ea4\u6362\u7a7a\u95f4\u3002Swap\u662f\u5b58\u50a8\u76d8\u4e0a\u7684 … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[49,5],"tags":[495,226],"class_list":["post-2706","post","type-post","status-publish","format-standard","hentry","category-linux","category-jishu","tag-centos7-x","tag-swap"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/2706","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/comments?post=2706"}],"version-history":[{"count":2,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/2706\/revisions"}],"predecessor-version":[{"id":9634,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/2706\/revisions\/9634"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/media?parent=2706"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/categories?post=2706"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/tags?post=2706"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}