{"id":385,"date":"2013-07-11T10:47:21","date_gmt":"2013-07-11T10:47:21","guid":{"rendered":"http:\/\/www.selinuxplus.com\/?p=385"},"modified":"2013-07-11T10:52:43","modified_gmt":"2013-07-11T10:52:43","slug":"lxclinux-containers","status":"publish","type":"post","link":"http:\/\/www.selinuxplus.com\/?p=385","title":{"rendered":"LXC,Linux containers"},"content":{"rendered":"

1 LXC\u5b89\u88c5<\/h2>\n
[root@41-dev ~]# wget <a href=\"http:\/\/lxc.sourceforge.net\/download\/lxc\/lxc-0.9.0.tar.gz\">http:\/\/lxc.sourceforge.net\/download\/lxc\/lxc-0.9.0.tar.gz<\/a>\r\n\r\n[root@41-dev lxc-0.9.0]# .\/configure\r\n\r\n[root@41-dev lxc-0.9.0]# make\r\n\r\n[root@41-dev lxc-0.9.0]# make install\r\n\r\n[root@41-dev lxc-0.9.0]# which lxc-version\r\n\r\n\/usr\/bin\/which: no lxc-version in (\/usr\/java\/jdk1.6.0_43\/bin:\/usr\/java\/jdk1.6.0_43\/jre\/bin:\/usr\/lib64\/ccache:\/usr\/local\/sbin:\/usr\/local\/bin:\/sbin:\/bin:\/usr\/sbin:\/usr\/bin:\/root\/adt\/sdk\/platform-tools:\/root\/adt\/sdk\/tools:\/root\/bin)\r\n\r\n[root@41-dev lxc-0.9.0]# lxc-version\r\n\r\nbash: lxc: command not found..\r\n\r\n[root@41-dev lxc-0.9.0]# cd \/usr\/local\/bin\/\r\n\r\n[root@41-dev bin]# ls\r\n\r\nlxc-attach\u00a0 lxc-checkconfig\u00a0 lxc-clone\u00a0\u00a0\u00a0 lxc-create\u00a0\u00a0 lxc-execute\u00a0 lxc-info\u00a0 lxc-ls\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 lxc-netstat\u00a0 lxc-restart\u00a0\u00a0 lxc-start\u00a0 lxc-unfreeze\u00a0 lxc-version\r\n\r\nlxc-cgroup\u00a0 lxc-checkpoint\u00a0\u00a0 lxc-console\u00a0 lxc-destroy\u00a0 lxc-freeze\u00a0\u00a0 lxc-kill\u00a0 lxc-monitor\u00a0 lxc-ps\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 lxc-shutdown\u00a0 lxc-stop\u00a0\u00a0 lxc-unshare\u00a0\u00a0 lxc-wait\r\n\r\n&nbsp;\r\n\r\n&nbsp;\r\n\r\n[root@41-dev bin]# export PATH=$PATH:\/usr\/local\/bin\r\n\r\n[root@41-dev bin]# echo $PATH\r\n\r\n\/usr\/java\/jdk1.6.0_43\/bin:\/usr\/java\/jdk1.6.0_43\/jre\/bin:\/usr\/lib64\/ccache:\/usr\/local\/sbin:\/usr\/local\/bin:\/sbin:\/bin:\/usr\/sbin:\/usr\/bin:\/root\/adt\/sdk\/platform-tools:\/root\/adt\/sdk\/tools:\/root\/bin:\/usr\/local\/bin<\/pre>\n
2 LXC\u7684\u4ecb\u7ecd<\/h2>\n
Lxc \u5168\u79f0\uff0cLinux containers\uff0c\u662f\u4e00\u79cd\u57fa\u4e8e\u5bb9\u5668\u7684\u64cd\u4f5c\u7cfb\u7edf\u5c42\u7ea7\u7684\u865a\u62df\u5316\u6280\u672f\u3002LXC\u53ef\u4ee5\u5728\u64cd\u4f5c\u7cfb\u7edf\u5c42\u7ea7\u4e0a\u63d0\u4f9b\u865a\u62df\u7684\u6267\u884c\u73af\u5883\uff0c\u4e00\u4e2a\u865a\u62df\u673a\u7684\u6267\u884c\u73af\u5883\u5c31\u662f\u4e00\u4e2a\u5bb9\u5668\uff0c\u53ef\u4ee5\u4e3a\u8be5\u5bb9\u5668\u7ed1\u5b9a\u7279\u5b9a\u7684CPU\u3001Memory\u8282\u70b9\uff0c\u5e76\u53ef\u4ee5\u5206\u914d\u7279\u5b9a\u6bd4\u4f8b\u7684CPU\u65f6\u95f4\uff0cIO\u65f6\u95f4\uff0c\u9650\u5236\u53ef\u4ee5\u4f7f\u7528\u7684\u5185\u5b58\u5927\u5c0f(\u5305\u62ec\u5185\u5b58\u548cswap\u7a7a\u95f4)\uff0c\u63d0\u4f9bdevice\u8bbf\u95ee\u63a7\u5236\uff0c\u63d0\u4f9b\u72ec\u7acb\u7684namespace(\u7f51\u7edc,pid,ipc,mnt,uts);<\/p>\n
LXC\u4f9d\u9760Linux\u5185\u6838\u76f8\u5173\u7279\u6027\uff0c\u57fa\u4e8e\u5bb9\u5668\u7684\u865a\u62df\u5316\u6280\u672f\u8d77\u6e90\u4e8e\u6240\u8c13\u7684\u8d44\u6e90\u5bb9\u5668\u548c\u5b89\u5168\u5bb9\u5668\uff0cLXC\u5728\u8d44\u6e90\u7ba1\u7406\u65b9\u9762\u4f9d\u8d56\u4e0eLinux\u5185\u6838\u7684Cgroups\u5b50\u7cfb\u7edf\uff0cCgroups\u5b50\u7cfb\u7edf\u662fLinux\u5185\u6838\u63d0\u4f9b\u7684\u4e00\u4e2a\u57fa\u4e8e\u8fdb\u7a0b\u7ec4\u7684\u8d44\u6e90\u7ba1\u7406\u6846\u67b6\uff0c\u53ef\u4ee5\u4e3a\u7279\u5b9a\u7684\u8fdb\u7a0b\u7ec4\u9650\u5b9a\u53ef\u4ee5\u4f7f\u7528\u8d44\u6e90\uff0cLXC\u5728\u8d44\u6e90\u9694\u79bb\u63a7\u5236\u65b9\u9762\u4f9d\u8d56\u4e0eLinux\u5185\u6838\u7684namespace\u7279\u6027\uff0c\u5177\u4f53\u800c\u8a00\u5c31\u662f\u5728clone\u65f6\u52a0\u5165\u76f8\u5e94\u7684flag(NEWNS NEWPID)\u7b49\u3002<\/p>\n
LXC\u548c\u4f20\u7edf\u7684HAL\uff08\u786c\u4ef6\u62bd\u8c61\u5c42\uff09\u5c42\u6b21\u7684\u865a\u62df\u5316\u6280\u672f\u76f8\u6bd4\uff0c\u5177\u6709\u4ee5\u4e0b\u4f18\u52bf\uff1a<\/p>\n
\uff11\u3000\u66f4\u5c0f\u7684\u865a\u62df\u5316\u5f00\u9500\uff08LXC\u7684\u8bf8\u591a\u7279\u6027\u6709Kernel\u63d0\u4f9b\uff0cKernel\u5b9e\u73b0\u8fd9\u4e9b\u7279\u6027\u53ea\u6709\u6781\u5c11\u7684\u6d88\u8017\uff09<\/p>\n
2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5feb\u901f\u90e8\u7f72\uff0c\u4e0d\u9700\u8981\u521b\u5efa\u865a\u62df\u673a\uff0c\u53ea\u9700\u8981\u5b89\u88c5LXC\uff0c\u4e0d\u9700\u8981\u5355\u72ec\u4e3a\u5185\u6838\u6253\u8865\u4e01\u3002<\/p>\n
1 Cgroups<\/h3>\n
Cgroups\u5b50\u7cfb\u7edf\u662f(control groups\u7684\u7f29\u5199)\uff0c\u662fLinux\u5185\u6838\u63d0\u4f9b\u7684\u4e00\u79cd\u53ef\u4ee5\u9650\u5236\u3001\u8bb0\u5f55\u3001\u9694\u79bb\u8fdb\u7a0b\u7ec4\uff08process\uff09\u6240\u4f7f\u7528\u7684\u7269\u7406\u8d44\u6e90\uff08cpu,memory,io.etc\uff09\u673a\u5236\u3002<\/p>\n
Cgroups\u6700\u521d\u7684\u76ee\u6807\u4e3a\u8d44\u6e90\u7ba1\u7406\u5668\u63d0\u4f9b\u7edf\u4e00\u7684\u6846\u67b6\uff0c\u65e2\u6574\u5408\u73b0\u6709\u7684cpuset\u7b49\u5b50\u7cfb\u7edf\uff0c\u4e5f\u4e3a\u672a\u6765\u5f00\u53d1\u65b0\u7684\u5b50\u7cfb\u7edf\u63d0\u4f9b\u63a5\u53e3\uff0c\u73b0\u5728\u7684cgroups\u9002\u7528\u4e8e\u591a\u79cd\u5e94\u6709\u573a\u666f\uff0c\u4ece\u5355\u72ec\u7684\u8fdb\u7a0b\u8d44\u6e90\u63a7\u5236\uff0c\u5230\u5b9e\u73b0\u64cd\u4f5c\u7cfb\u7edf\u5c42\u6b21\u7684\u865a\u62df\u5316\u3002<\/p>\n
1 \u9650\u5236\u8fdb\u7a0b\u7ec4\u53ef\u4ee5\u4f7f\u7528\u8d44\u6e90\u7684\u6570\u91cf\uff0cResource Limiting\uff0c\u5982\uff0cmemory\u5b50\u7cfb\u7edf\u53ef\u4ee5\u4e3a\u8fdb\u7a0b\u8bbe\u5b9a\u4e00\u4e2amemory\u4f7f\u7528\u4e0a\u9650\uff0c\u4e00\u65e6\u8fdb\u7a0b\u7ec4\u4f7f\u7528\u7684\u5185\u5b58\u8fbe\u5230\u9650\u989d\u518d\u7533\u8bf7\u5185\u5b58\uff0c\u5c31\u4f1a\u89e6\u53d1OOM(Out of memory).<\/p>\n
2 \u8fdb\u7a0b\u7ec4\u7684\u4f18\u5148\u7ea7\u63a7\u5236\uff0c\u6bd4\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528CPU\u5b50\u7cfb\u7edf\u4e3a\u67d0\u4e2a\u8fdb\u7a0b\u7ec4\u5206\u914d\u7279\u5b9a\u7684cpu share.<\/p>\n
3 \u8bb0\u5f55\u8fdb\u7a0b\u7ec4\u4f7f\u7528\u7684\u8d44\u6e90\u6570\u91cf\uff0c\u6bd4\u5982\u53ef\u4ee5\u4f7f\u7528cpuacct\u5b50\u7cfb\u7edf\u8bb0\u5f55\u67d0\u4e2a\u8fdb\u7a0b\u4f7f\u7528cpu\u7684\u65f6\u95f4\u3002<\/p>\n
4 \u8fdb\u7a0b\u7ec4\u9694\u79bb\uff0c\u6bd4\u5982\u4f7f\u7528ns\u5b50\u7cfb\u7edf\u53ef\u4ee5\u4f7f\u4e0d\u540c\u7684\u8fdb\u7a0b\u7ec4\u4f7f\u7528\u4e0d\u540c\u7684namespace\uff0c\u4ee5\u8fbe\u5230\u9694\u79bb\u7684\u76ee\u7684\uff0c\u4e0d\u540c\u7684\u8fdb\u7a0b\u7ec4\u6709\u5404\u81ea\u7684\u8fdb\u7a0b\u3001\u7f51\u7edc\u3001\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u7a7a\u95f4\u3002<\/p>\n
5 \u8fdb\u7a0b\u7ec4\u63a7\u5236\uff0c\u6bd4\u5982\u4f7f\u7528freezer\u5b50\u7cfb\u7edf\u5c06\u8fdb\u7a0b\u7ec4\u6302\u8d77\u548c\u6062\u590d\u3002<\/p>\n
\n
Cgroups\u7684\u76f8\u5173\u6982\u5ff5\uff1a<\/p>\n
1 \u4efb\u52a1\uff1a(task),\u5728cgroups\u4e2d\uff0c\u4efb\u52a1\u5c31\u662f\u7cfb\u7edf\u7684\u4e00\u4e2a\u8fdb\u7a0b<\/p>\n
2 \u63a7\u5236\u65cf\u7fa4\uff0c(control groups)\u3002\u63a7\u5236\u65cf\u7fa4\u5c31\u662f\u4e00\u7ec4\u6309\u7167\u67d0\u79cd\u6807\u51c6\u5212\u5206\u7684\u8fdb\u7a0b\uff0cCgroups<\/p>\n
\u4e2d\u7684\u8d44\u6e90\u63a7\u5236\u662f\u4e00\u63a7\u5236\u65cf\u7fa4\u4e3a\u5355\u4f4d\u5b9e\u73b0\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u52a0\u5165\u5230\u67d0\u4e2a\u63a7\u5236\u65cf\u7fa4\uff0c\u4e5f\u4ece\u4e00\u4e2a\u8fdb\u7a0b\u7ec4\u8fc1\u79fb\u5230\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u7ec4\u7fa4\u3002\u4e00\u4e2a\u8fdb\u7a0b\u7ec4\u7684\u8fdb\u7a0b\u53ef\u4ee5\u4f7f\u7528cgroups\u4ee5\u63a7\u5236\u65cf\u7fa4\u4e3a\u5355\u4f4d\u5206\u914d\u8d44\u6e90\uff0c\u540c\u65f6\u4e5f\u53d7\u5230cgroups\u4ee5\u63a7\u5236\u65cf\u7fa4\u4e3a\u5355\u4f4d\u8bbe\u5b9a\u7684\u9650\u5236\u3002<\/p>\n
3 \u5c42\u7ea7\uff0c(hierarchy).\u63a7\u5236\u65cf\u7fa4\u53ef\u4ee5\u7ec4\u7ec7\u6210hierarchical\u7684\u5f62\u5f0f\uff0c\u65e2\u4e00\u9897\u63a7\u5236\u65cf\u7fa4\u6811\uff0c\u63a7\u5236\u65cf\u7fa4\u6811\u4e0a\u7684\u5b50\u8282\u70b9\u63a7\u5236\u65cf\u7fa4\u662f\u7236\u8282\u70b9\u63a7\u5236\u65cf\u7fa4\u7684\u5b69\u5b50\u3002\u7ee7\u627f\u7236\u63a7\u5236\u65cf\u7fa4\u7684\u7279\u5b9a\u7684\u5c5e\u6027\u3002<\/p>\n
4 \u5b50\u7cfb\u7edf\uff0c(subsystem)\u3002\u4e00\u4e2a\u5b50\u7cfb\u7edf\u5c31\u662f\u4e00\u4e2a\u8d44\u6e90\u63a7\u5236\u5668\uff0c \u6bd4\u5982cpu\u5b50\u7cfb\u7edf\u5c31\u662f\u63a7\u5236cpu\u65f6\u95f4\u5206\u914d\u5668\u7684\u4e00\u4e2a\u63a7\u5236\u5668\uff0c\u5b50\u7cfb\u7edf\u5fc5\u987b\u9644\u52a0attach\u5230\u4e00\u4e2a\u5c42\u7ea7\u4e0a\u624d\u80fd\u8d77\u4f5c\u7528\uff0c\u4e00\u4e2a\u5b50\u7cfb\u7edf\u9644\u52a0\u5230\u67d0\u4e2a\u5c42\u7ea7\u4ee5\u540e\uff0c\u8fd9\u4e2a\u5c42\u7ea7\u4e0a\u7684\u6240\u6709\u63a7\u5236\u65cf\u7fa4\u90fd\u53d7\u5230\u8fd9\u4e2a\u5b50\u7cfb\u7edf\u7684\u63a7\u5236\u3002<\/p>\n
Cgroups\u7684\u7cfb\u7edf\u76f8\u4e92\u5173\u7cfb<\/p>\n
1 \u6bcf\u6b21\u5728\u7cfb\u7edf\u4e2d\u521b\u5efa\u65b0\u5c42\u7ea7\u65f6\uff0c \u8be5\u7cfb\u7edf\u4e2d\u7684\u6240\u6709\u4efb\u52a1\u90fd\u662f\u90a3\u4e2a\u5c42\u6b21\u7684\u9ed8\u8ba4cgroup.(root cgroup,\u6b64 cgroup\u5728\u521b\u5efa\u5c42\u7ea7\u65f6\uff0c\u81ea\u52a8\u521b\u5efa\uff0c\u540e\u9762\u5728\u8be5\u5c42\u7ea7\u4e2d\u521b\u5efa\u7684cgroup\u90fd\u662f\u6b64cgroup\u7684\u540e\u4ee3)\u7684\u521d\u59cb\u6210\u5458\u3002<\/p>\n
2 \u4e00\u4e2a\u5b50\u7cfb\u7edf\u6700\u591a\u53ea\u80fd\u9644\u52a0\u5230\u4e00\u4e2a\u5c42\u7ea7\u3002<\/p>\n
3 \u4e00\u4e2a\u5c42\u7ea7\u53ef\u4ee5\u9644\u52a0\u591a\u4e2a\u5b50\u7cfb\u7edf<\/p>\n
4 \u4e00\u4e2a\u4efb\u52a1\u53ef\u4ee5\u662f\u591a\u4e2acgroup\u7684\u6210\u5458\uff0c\u4f46\u8fd9\u4e9bcgroup\u5fc5\u987b\u5728\u4e0d\u540c\u7684\u5c42\u7ea7\u3002<\/p>\n
5 \u7cfb\u7edf\u4e2d\u7684\u8fdb\u7a0b\uff08\u4efb\u52a1\uff09\u521b\u5efa\u5b50\u8fdb\u7a0b(\u4efb\u52a1)\u65f6\uff0c\u8be5\u5b50\u4efb\u52a1\u81ea\u52a8\u6210\u4e3a\u5176\u7236\u8fdb\u7a0b\u6240\u5728\u7684cgroup\u7684\u6210\u5458\u3002 \u7136\u540e\u53ef\u4ee5\u6839\u636e\u9700\u8981\u5c06\u8be5\u5b50\u4efb\u52a1\u79fb\u52a8\u5230\u4e0d\u540c\u7684cgroup\u4e2d\uff0c\u4f46\u5f00\u59cb\u65f6\uff0c\u603b\u662f\u7ee7\u627f\u5176\u7236\u4efb\u52a1\u7684cgroups<\/p>\n
\n
Cgroups\u5b50\u7cfb\u7edf\u4ecb\u7ecd<\/p>\n
blkio–\u8fd9\u4e2a\u5b50\u7cfb\u7edf\u4e3a\u5757\u8bbe\u5907\u8bbe\u5b9a\u8f93\u5165\/\u8f93\u51fa\u9650\u5236\uff0c\u6bd4\u5982\u7269\u7406\u8bbe\u5907(\u786c\u76d8\uff0c\u56fa\u6001\u786c\u76d8\uff0cusb\u7b49)<\/p>\n
cpu–\u8fd9\u4e2a\u5b50\u7cfb\u7edf\u4f7f\u7528\u8c03\u5ea6\u7a0b\u5e8f\u63d0\u4f9b\u5bf9CPU\u7684cgroup \u4efb\u52a1\u8bbf\u95ee<\/p>\n
cpuacct– \u8fd9\u4e2a\u5b50\u7cfb\u7edf\u81ea\u52a8\u751f\u6210cgroup\u4e2d\u4efb\u52a1\u6240\u4f7f\u7528\u7684cpu\u62a5\u544a<\/p>\n
cpuset –\u8fd9\u4e2a\u5b50\u7cfb\u7edf\u4e3acgroup\u4e2d\u7684\u4efb\u52a1\u5206\u914d\u72ec\u7acbCPU\u548c\u5185\u5b58\u8282\u70b9<\/p>\n
devices–\u8fd9\u4e2a\u5b50\u7cfb\u7edf\u5141\u8bb8\u6216\u8005\u62d2\u7eddcgroup\u4e2d\u7684\u4efb\u52a1\u8bbf\u95ee\u8bbe\u5907<\/p>\n
freezer– \u8fd9\u4e2a\u5b50\u7cfb\u7edf\u522e\u8d77\u6216\u8005\u6062\u590dcgroup\u4e2d\u7684\u4efb\u52a1<\/p>\n
memory — \u8fd9\u4e2a\u5b50\u7cfb\u7edf\u8bbe\u5b9acgroup\u4e2d\u4efb\u52a1\u5185\u5b58\u7684\u9650\u5236\uff0c\u5e76\u81ea\u52a8\u751f\u6210\u7531\u90a3\u4e9b\u4efb\u52a1\u4f7f\u7528\u7684\u5185\u5b58\u8d44\u6e90\u62a5\u544a\u3002<\/p>\n
Net_cls–\u8fd9\u4e2a\u5b50\u7cfb\u7edf\u4f7f\u7528\u7b49\u7ea7\u8bc6\u522b\u7b26(classid)\u6807\u8bb0\u7f51\u7edc\u6570\u636e\u5305\uff0c\u53ef\u4ee5\u5141\u8bb8linux\u6d41\u91cf\u63a7\u5236\u7a0b\u5e8ftc,\u8bc6\u522b\u4ece\u5177\u4f53cgroup\u4e2d\u751f\u6210\u7684\u6570\u636e\u5305<\/p>\n
Ns — \u547d\u540d\u7a7a\u95f4\u5b50\u7cfb\u7edf\u3002<\/p>\n
 <\/p>\n
2 Namespaces\u673a\u5236<\/h3>\n
Linux Namespaces\u673a\u5236\u63d0\u4f9b\u4e86\u4e00\u79cd\u8d44\u6e90\u9694\u79bb\u65b9\u6848\uff0cPID\u3001IPC\u3001NetWork\u7b49\u7cfb\u7edf\u8d44\u6e90\u4e0d\u518d\u662f\u5168\u5c40\u6027\u7684\uff0c\u800c\u662f\u5c5e\u4e8e\u7279\u5b9a\u7684Namespace.\u6bcf\u4e2aNamespaces\u91cc\u9762\u7684\u8d44\u6e90\u5bf9\u5176\u4ed6\u7684Namespace\u90fd\u662f\u900f\u660e\u7684\u3002\u8981\u521b\u5efa\u65b0\u7684Namespace\uff0c\u53ea\u9700\u8981\u8c03\u7528clone \u65f6\u6307\u5b9a\u76f8\u5e94\u7684flag\u3002\u5f53\u8c03\u7528clone\u65f6\uff0c\u8bbe\u5b9a\u4e3aCLONE_NEWPID.\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684pid Namespaces\u3002clone\u51fa\u6765\u7684\u65b0\u8fdb\u7a0b\u5c06\u6210\u4e3aNameSpace\u91cc\u7684\u7b2c\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u4e00\u4e2aPID Namespace \u4e3a\u8fdb\u7a0b\u63d0\u4f9b\u4e86\u4e00\u4e2a\u72ec\u7acb\u7684PID\u73af\u5883\uff0cPID namespace\u5185\u7684PID\u5c06\u4ece1\u5f00\u59cb\uff0c\u5728Namespace\u5185\u8c03\u7528fork\uff0cvfork\uff0c\u6216clone\u90fd\u5c06\u4ea7\u751f\u4e00\u4e2a\u5728\u8be5Namespace\u5185\u90e8\u72ec\u7acb\u7684PID\u3002\u65b0\u521b\u5efa\u7684Namespace\u91cc\u7684\u7b2c\u4e00\u4e2a\u8fdb\u7a0b\u5728\u8be5Namespace\u5185\u7684PID\u4e3a1.PID namespace \u662f\u5c42\u6b21\u6027\u7684\uff0c\u65b0\u5efa\u7684Namespace\u5c06\u4f1a\u521b\u5efa\u8be5Namespace\u7684\u8fdb\u7a0b\u5c5e\u4e8eNamespace\u7684\u5b50namespace\u3002\u5b50namespace\u4e2d\u7684\u8fdb\u7a0b\u5bf9\u4e8e\u7236namespace\u662f\u53ef\u89c1\u7684\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u5c06\u62e5\u6709\u4e0d\u6b62\u4e00\u4e2aPID\u3002\u800c\u662f\u5728\u6240\u5728\u7684Namespace\u4e2d\u7684\u8fdb\u7a0b\u5bf9\u6240\u6709\u76f4\u7cfb\u7956\u5148Namespace\u4e2d\u90fd\u5c06\u6709\u6709\u4e00\u4e2aPID\u3002<\/p>\n
\u5f53\u8c03\u7528Clone\uff0c\u8bbe\u5b9a\u4e86Clone_NEWIPC.\u5c06\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684IPCNamespace\uff0cclone\u51fa\u6765\u7684\u8fdb\u7a0b\u5c06\u6210\u4e3aNamespace\u91cc\u7684\u7b2c\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u4e00\u4e2aIPC Namespace \u6709\u4e00\u7ec4System V IPC objects\u6807\u8bc6\u7b26\u6784\u6210\uff0c\u8fd9\u4e2a\u6807\u8bc6\u7b26\u6709IPC\u76f8\u5173\u7684\u7cfb\u7edf\u8c03\u7528\u521b\u5efa\uff0c \u5728\u4e00\u4e2aIPC Namespace\u91cc\u9762\u521b\u5efaIPC object \u5bf9\u8be5Namespace\u5185\u7684\u6240\u6709\u8fdb\u7a0b\u53ef\u89c1\uff0c\u4f46\u5bf9\u5176\u4ed6\u7684Namespace\u4e0d\u53ef\u89c1\uff0c\u8fd9\u6837\u5c31\u4f7f\u7684\u4e0d\u540c\u7684Namespace \u4e4b\u95f4\u7684\u8fdb\u7a0b\u4e0d\u80fd\u76f4\u63a5\u901a\u4fe1\u3002PID namespace\u548cIPCnamespace\u53ef\u4ee5\u7ec4\u5408\u8d77\u6765\u4e00\u8d77\u4f7f\u7528\uff0c\u53ea\u9700\u8981\u5728\u8c03\u7528clone\u65f6\uff0c\u540c\u65f6\u6307\u5b9aCLONE_NEWPID|CLONE_NEWIPC.<\/p>\n
\u5f53\u8c03\u7528Clone\u65f6\uff0c\u8bbe\u5b9a\u4e86CLONE_NEWNS\uff0c\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684mount Namespace\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u5b58\u5728\u4e8e\u4e00\u4e2amount namespace\u91cc\u9762\uff0cmount namespace\u4e3a\u8fdb\u7a0b\u63d0\u4f9b\u4e00\u4e2a\u6587\u4ef6\u5c42\u6b21\u89c6\u56fe\uff0c\u5982\u679c\u4e0d\u8bbe\u5b9a\u8fd9\u4e2aflag\uff0c\u5b50\u8fdb\u7a0b\u548c\u7236\u8fdb\u7a0b\u5171\u4eab\u4e00\u4e2amount namespace\uff0c\u5176\u540e\u5b50\u8fdb\u7a0b\u8c03\u7528mount\u6216umount\u5c06\u4f1a\u5f71\u54cd\u5230\u6240\u6709\u8be5Namespace\u5185\u7684\u8fdb\u7a0b\uff0c\u5982\u679c\u5b50\u8fdb\u7a0b\u5728\u4e00\u4e2a\u72ec\u7acb\u7684mount namespace\u91cc\u9762\uff0c\u5c31\u53ef\u4ee5\u8c03\u7528mount\u6216umount\u5efa\u7acb\u4e00\u4efd\u65b0\u7684\u6587\u4ef6\u5c42\u6b21\u89c6\u56fe\u3002\u8be5flag\u914d\u5408pivot_root\u7cfb\u7edf\u8c03\u7528\uff0c\u53ef\u4ee5\u4e3a\u8fdb\u7a0b\u521b\u5efa\u4e00\u4e2a\u72ec\u7acb\u7684\u76ee\u5f55\u7a7a\u95f4\u3002<\/p>\n
\u5f53\u8c03\u7528clone\uff0c\u8bbe\u5b9aCLONE_NEWNET,\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684NetWork Namespace.\u4e00\u4e2anetwork namespace\u4e3a\u8fdb\u7a0b\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5b8c\u5168\u72ec\u529b\u7684\u7f51\u7edc\u534f\u8bae\u6808\u7684\u89c6\u56fe\uff0c\u5305\u62ec\u7f51\u7edc\u8bbe\u5907\u63a5\u53e3\uff0cIPV4\/IPV6\u534f\u8bae\u6808\uff0cIP\u8def\u7531\u8868\uff0c\u9632\u706b\u5899\u89c4\u5219\uff0csockets\u7b49\u3002\u4e00\u4e2aNetwork namespace\u63d0\u4f9b\u4e86\u4e00\u4e2a\u72ec\u7acb\u7684\u7f51\u7edc\u73af\u5883\uff0c\u5c31\u8ddf\u4e00\u4e2a\u72ec\u7acb\u7684\u7cfb\u7edf\u4e00\u6837\u3002\u4e00\u4e2a\u7269\u7406\u8bbe\u5907\u53ea\u80fd\u5b58\u5728\u4e00\u4e2aNetwork namespace\u4e2d\uff0c\u53ef\u4ee5\u4ece\u4e00\u4e2anamespace \u79fb\u52a8\u5230\u53e6\u4e00\u4e2aNamespace\u4e2d\uff0c\u865a\u62df\u7f51\u7edc\u8bbe\u5907\u63d0\u4f9b\u4e86\u4e00\u79cd\u7c7b\u4f3c\u7ba1\u9053\u7684\u62bd\u8c61\uff0c\u53ef\u4ee5\u5728\u4e0d\u540c\u7684Namespace\u4e4b\u95f4\u5efa\u7acb\u96a7\u9053\uff0c\u5229\u7528\u865a\u62df\u5316\u7f51\u7edc\u8bbe\u5907\uff0c\u53ef\u4ee5\u5efa\u7acb\u5230\u5176\u4ed6\u7684namespace\u4e2d\u7684\u7269\u7406\u8bbe\u5907\u6865\u63a5\uff0c\u5f53\u4e00\u4e2aNamespace\u88ab\u9500\u6bc1\u65f6\uff0c\u7269\u7406\u8bbe\u5907\u4f1a\u81ea\u52a8\u79fb\u56deinit network namespace\uff0c\u5373\u7cfb\u7edf\u6700\u5f00\u59cb\u7684namespace.<\/p>\n
\u5f53\u8c03\u7528clone\uff0c\u8bbe\u5b9aCLONE_NEWUTS,\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684UTS Namespace\uff0c\u4e00\u4e2aUTSnamespcae \u5c31\u662f\u4e00\u7ec4\u88abuname\u8fd4\u56de\u7684\u6807\u8bc6\u7b26\uff0c\u65b0\u7684UTS namespace \u4e2d\u7684\u6807\u8bc6\u7b26\u901a\u8fc7\u590d\u5236\u8c03\u7528\u8fdb\u7a0b\u6240\u5c5e\u7684namespace\u7684\u6807\u8bc6\u7b26\u6765\u521d\u59cb\u5316\uff0cclone\u51fa\u6765\u7684\u8fdb\u7a0b\u53ef\u4ee5\u901a\u8fc7\u76f8\u5173\u7cfb\u7edf\u8c03\u7528\u6539\u53d8\u8fd9\u4e9b\u6807\u8bc6\u7b26\uff0c\u6bd4\u5982sethostname\u6765\u6539\u53d8namespace\u7684hostname\u3002\u8fd9\u4e00\u6539\u53d8\uff0c\u5bf9namespace\u5185\u6240\u6709\u8fdb\u7a0b\u53ef\u89c1\u3002CLONE_NEWUTS\u548cCLONE_NEWNET\u53ef\u4ee5\u4e00\u8d77\u4f7f\u7528\u3002<\/p>\n
\u4ee5\u4e0a\u6240\u6709clone flag \u90fd\u53ef\u4ee5\u4e00\u8d77\u4f7f\u7528\uff0c\u4e3a\u8fdb\u7a0b\u63d0\u4f9b\u4e86\u4e00\u4e2a\u72ec\u7acb\u7684\u8fd0\u884c\u73af\u5883\uff0cLXC\u6b63\u662f\u901a\u8fc7\u5728clone\u65f6\u8bbe\u5b9aflag\uff0c\u4e3a\u8fdb\u7a0b\u521b\u5efa\u5bf9\u7acbPID\uff0cIPC\uff0cFS\uff0cNETWORK\uff0cUTS\u7684\u7a7a\u95f4\u5bb9\u5668\uff0c\u4e00\u4e2a\u5bb9\u5668\u5c31\u662f\u4e00\u4e2a\u865a\u62df\u7684\u8fd0\u884c\u73af\u5883\uff0c\u5bf9\u5bb9\u5668\u7684\u8fdb\u7a0b\u662f\u900f\u660e\u7684\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u4ee5\u4e3a\u81ea\u5df1\u76f4\u63a5\u5728\u7cfb\u7edf\u4e0a\u8fd0\u884c\u3002<\/p>\n
chromium\u5728sandbox\u91cc\u5c06\u8bbe\u7f6enamespace\u7684\u4ee3\u7801\uff1a<\/p>\n
 <\/p>\n
12 static bool MoveToNewNamespaces() {\r\n\r\n213\u00a0\u00a0 \/\/ These are the sets of flags which we'll try, in order.\r\n\r\n214\u00a0\u00a0 const int kCloneExtraFlags[] = {\r\n\r\n215\u00a0\u00a0\u00a0\u00a0 CLONE_NEWPID | CLONE_NEWNET,\r\n\r\n216\u00a0\u00a0\u00a0\u00a0 CLONE_NEWPID,\r\n\r\n217\u00a0\u00a0 };\r\n\r\n218\r\n\r\n219\u00a0\u00a0 \/\/ We need to close kZygoteIdFd before the child can continue. We use this\r\n\r\n220\u00a0\u00a0 \/\/ socketpair to tell the child when to continue;\r\n\r\n221\u00a0\u00a0 int sync_fds[2];\r\n\r\n222\u00a0\u00a0 if (socketpair(AF_UNIX, SOCK_STREAM, 0, sync_fds)) {\r\n\r\n223\u00a0\u00a0\u00a0\u00a0 FatalError(\"Failed to create a socketpair\");\r\n\r\n224\u00a0\u00a0 }\r\n\r\n225\r\n\r\n226\u00a0\u00a0 for (size_t i = 0;\r\n\r\n227\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 i &lt; sizeof(kCloneExtraFlags) \/ sizeof(kCloneExtraFlags[0]);\r\n\r\n228\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 i++) {\r\n\r\n229\u00a0\u00a0\u00a0\u00a0 pid_t pid = syscall(__NR_clone, SIGCHLD | kCloneExtraFlags[i], 0, 0, 0);<\/pre>\n","protected":false},"excerpt":{"rendered":"
1 LXC\u5b89\u88c5 [root@41-dev ~]# …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[45,74],"tags":[73,37,71,72],"_links":{"self":[{"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/posts\/385"}],"collection":[{"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=385"}],"version-history":[{"count":3,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/posts\/385\/revisions"}],"predecessor-version":[{"id":387,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/posts\/385\/revisions\/387"}],"wp:attachment":[{"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=385"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=385"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=385"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}