{"id":67,"date":"2018-03-29T14:49:42","date_gmt":"2018-03-29T06:49:42","guid":{"rendered":"http:\/\/www.cloudy.pub\/?p=67"},"modified":"2018-06-07T22:46:13","modified_gmt":"2018-06-07T14:46:13","slug":"centos-7-%e5%bc%80%e5%90%afbbr%e5%8a%a0%e9%80%9f","status":"publish","type":"post","link":"https:\/\/www.0moon.com\/?p=67","title":{"rendered":"Centos 7 \u5f00\u542fBBR\u52a0\u901f"},"content":{"rendered":"<ul>\n<li>\u4e0b\u8f7d\u66f4\u6362\u5185\u6838<br \/>\n\u6700\u65b0\u5185\u6838\u67e5\u770b<a href=\"http:\/\/elrepo.org\/linux\/kernel\/el7\/x86_64\/RPMS\/\" rel=\"nofollow\">\u8fd9\u91cc<\/a><\/li>\n<\/ul>\n<pre><code>rpm --import https:\/\/www.elrepo.org\/RPM-GPG-KEY-elrepo.org\r\nrpm -Uvh http:\/\/www.elrepo.org\/elrepo-release-7.0-3.el7.elrepo.noarch.rpm\r\nyum --enablerepo=elrepo-kernel install kernel-ml -y\r\n<\/code><\/pre>\n<ul>\n<li>\u67e5\u770b\u5185\u6838\u662f\u5426\u5b89\u88c5\u6210\u529f<\/li>\n<\/ul>\n<pre><code>rpm -qa | grep kernel\r\n<\/code><\/pre>\n<ul>\n<li>\u5220\u9664\u65e7\u5185\u6838(\u53ef\u9009)<\/li>\n<\/ul>\n<pre><code>rpm -ev \u65e7\u5185\u6838  \r\n<\/code><\/pre>\n<ul>\n<li>\u66f4\u65b0 grub \u7cfb\u7edf\u5f15\u5bfc\u6587\u4ef6\u5e76\u91cd\u542f<\/li>\n<\/ul>\n<pre><code>egrep ^menuentry \/etc\/grub2.cfg | cut -f 2 -d \\'\r\ngrub2-set-default 0  # default 0 \u8868\u793a\u7b2c\u4e00\u4e2a\u5185\u6838\u8bbe\u7f6e\u4e3a\u9ed8\u8ba4\u8fd0\u884c, \u9009\u62e9\u6700\u65b0\u5185\u6838\u5c31\u5bf9\u4e86\r\nreboot\r\n<\/code><\/pre>\n<ul>\n<li>\u6ce8\u610f\uff0c\u67d0\u4e9b\u670d\u52a1\u5546\uff08\u5982 <a href=\"https:\/\/www.digitalocean.com\/community\/tutorials\/how-to-update-a-digitalocean-server-s-kernel\" rel=\"nofollow\">Digital Ocean<\/a>\uff09\u53ef\u80fd\u9700\u8981\u9996\u5148\u5c06 VPS \u914d\u7f6e\u4e3a\u53ef\u81ea\u5b9a\u4e49\u5185\u6838\uff0c\u7136\u540e grub2 \u7684\u914d\u7f6e\u624d\u4f1a\u751f\u6548\u3002<\/li>\n<\/ul>\n<p>\u91cd\u65b0\u542f\u52a8\u540e\uff0c\u5982\u679c\u4f1a\u51fa\u73b0 &#8220;read-only file system&#8221; \u7684\u9519\u8bef\uff0croot\u8d26\u6237\u4e0b\u6267\u884c <code>mount -o remount rw \/<\/code>\u5373\u53ef<\/p>\n<ul>\n<li>\u66f4\u65b0\u5230\u6700\u65b0\u7248\u5185\u6838<\/li>\n<\/ul>\n<p>\u53e6\uff1a\u67e5\u770b\u53ef\u7528\u7684kernel<br \/>\nyum list available &#8211;disablerepo=&#8217;*&#8217; &#8211;enablerepo=elrepo-kernel<\/p>\n<p>\u65b9\u6cd5\u540c CentOS 6<\/p>\n<h2><a id=\"user-content-\u5f00\u542fbbr\" class=\"anchor\" href=\"https:\/\/github.com\/iMeiji\/shadowsocks_install\/wiki\/%E5%BC%80%E5%90%AFTCP-BBR%E6%8B%A5%E5%A1%9E%E6%8E%A7%E5%88%B6%E7%AE%97%E6%B3%95#%E5%BC%80%E5%90%AFbbr\" aria-hidden=\"true\"><\/a>\u5f00\u542fbbr<\/h2>\n<p>\u5f00\u673a\u540e <code>uname -r<\/code> \u770b\u770b\u662f\u4e0d\u662f\u5185\u6838 &gt;= 4.9<\/p>\n<p>\u6267\u884c <code>lsmod | grep bbr<\/code>\uff0c\u5982\u679c\u7ed3\u679c\u4e2d\u6ca1\u6709 <code>tcp_bbr<\/code> \u7684\u8bdd\u5c31\u5148\u6267\u884c<\/p>\n<pre><code>modprobe tcp_bbr\r\necho \"tcp_bbr\" &gt;&gt; \/etc\/modules-load.d\/modules.conf\r\n<\/code><\/pre>\n<p>\u6267\u884c<\/p>\n<pre><code>echo \"net.core.default_qdisc=fq\" &gt;&gt; \/etc\/sysctl.conf\r\necho \"net.ipv4.tcp_congestion_control=bbr\" &gt;&gt; \/etc\/sysctl.conf\r\n<\/code><\/pre>\n<p>\u4fdd\u5b58\u751f\u6548<br \/>\n<code>sysctl -p<\/code><\/p>\n<p>\u6267\u884c<\/p>\n<pre><code>sysctl net.ipv4.tcp_available_congestion_control\r\nsysctl net.ipv4.tcp_congestion_control\r\n<\/code><\/pre>\n<p>\u5982\u679c\u7ed3\u679c\u90fd\u6709 <code>bbr<\/code>, \u5219\u8bc1\u660e\u4f60\u7684\u5185\u6838\u5df2\u5f00\u542f bbr<\/p>\n<p>\u6267\u884c <code>lsmod | grep bbr<\/code>, \u770b\u5230\u6709 tcp_bbr \u6a21\u5757\u5373\u8bf4\u660e bbr \u5df2\u542f\u52a8<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0b\u8f7d\u66f4\u6362\u5185\u6838 \u6700\u65b0\u5185\u6838\u67e5\u770b\u8fd9\u91cc rpm &#8211;import https:\/\/www.elrepo.org\/RPM [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,13],"tags":[],"class_list":["post-67","post","type-post","status-publish","format-standard","hentry","category-linux","category-study"],"_links":{"self":[{"href":"https:\/\/www.0moon.com\/index.php?rest_route=\/wp\/v2\/posts\/67","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.0moon.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.0moon.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.0moon.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.0moon.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=67"}],"version-history":[{"count":2,"href":"https:\/\/www.0moon.com\/index.php?rest_route=\/wp\/v2\/posts\/67\/revisions"}],"predecessor-version":[{"id":147,"href":"https:\/\/www.0moon.com\/index.php?rest_route=\/wp\/v2\/posts\/67\/revisions\/147"}],"wp:attachment":[{"href":"https:\/\/www.0moon.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=67"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.0moon.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=67"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.0moon.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=67"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}