top 命令 示例 [root@os-gitlab-runner ~]# top top - 16:59:38 up 1022 days, 7:02, 2 users, load average: 4.13, 3.21, 3.11 Tasks: 149 total, 1 running, 148 sleeping, 0 stopped, 0 zombie %Cpu(s): 31.1 us, 4.5 sy, 0.0 ni, 49.7 id, 14.6 wa, 0.0 hi, 0.1 si, 0.0 st KiB Mem : 8010424 total, 152468 free, 2697544 used, 5160412 buff/cache KiB Swap: 8388604 total, 7276320 free, 1112284 used. 4944828

B-tree structure each node contains key values, pointers to the values, and pointers to child nodes with smaller and larger values than the value in the parent node. in a B-Tree structure, each value is unique. B+Tree structure： - The internal nodes only store values; they don’t store pointers to actual rows. The leaf nodes store the

关键点 整体流程 +--------+ +---------------+ | |--(A)- Authorization Request ->| Resource | | | | Owner | | |<-(B)-- Authorization Grant ---| | | | +---------------+ | | | | +---------------+ | |--(C)-- Authorization Grant -->| Authorization | | Client | | Server | | |<-(D)----- Access Token -------| | | | +---------------+ | | | | +---------------+ | |--(E)----- Access Token ------>| Resource | |

将进程挂起在后台执行 运行前 command & 运行中 先按CTRL+Z将程序暂停，然后使用bg命令放到后台运行 bg %1 输出合并 将命令执行的进程日志，stderr 合

使用命令 netstat -tuplen -t tcp连接 -u udp连接 -p, –programs display PID/Program name for sockets -l, –listening display listening server sockets -e, –extend display other/more information -n, –numeric don’t resolve names netstat status: - time_wait tcp发起断连方，socket会进入该状态，不能被