heidsoft

# 创建用户` ``` mysql> CREATE USER 'root'@'10.188.66.67' IDENTIFIED BY 'admin'; ERROR 1819 (HY000): Your password does not satisfy the current policy requirements mysql> SHOW VARIABLES LIKE 'validate_password%'; +--------------------------------------+-------+ | Variable_name...

``` (base) heidsoft@dev01:/usr/sbin$ sudo bpftrace -e 'tracepoint:raw_syscalls:sys_enter {@[pid,comm]=count();}' [sudo] password for heidsoft: Attaching 1 probe... ^C @[594, wpa_supplicant]: 2 @[917, ib_srv_mon]: 2 @[917, ib_dict_stats]: 2 @[3412, update-notifier]: 4 @[3004, ssh-agent]:...

`bpftrace` 是一种强大的跟踪和分析工具，用于理解和调试 Linux 内核和应用程序的性能问题。它使用 eBPF（Extended Berkeley Packet Filter）技术，eBPF 是 Linux 内核中的一个新型功能，可以在内核空间运行用户定义的沙箱程序。 `bpftrace -e 'tracepoint:syscalls:sys_enter_* {@[probe]=count();}'` 命令的含义如下： - `-e`：指定要执行的 bpftrace 脚本。 - `tracepoint:syscalls:sys_enter_*`：这里定义了一个 tracepoint（跟踪点）探针，该探针将匹配所有以 `sys_enter_` 开头的系统调用。这些调用代表了进入系统调用的点。 - `@[probe]=count();`：这是一个 map（映射）表达式，它将为每个触发的探针计数。`probe` 是一个内置变量，代表当前触发的探针名称。`count()` 是一个函数，用于计算触发的次数。...

``` (base) heidsoft@dev01:/usr/sbin$ sudo bpftrace -e 'tracepoint:syscalls:sys_enter_openat {printf("%s -> %s\n",comm,str(args->filename));}' Attaching 1 probe... vmtoolsd -> /proc/meminfo vmtoolsd -> /proc/vmstat vmtoolsd -> /proc/stat vmtoolsd -> /proc/zoneinfo vmtoolsd -> /proc/uptime vmtoolsd ->...

``` (base) heidsoft@dev01:/usr/sbin$ sudo bpftrace --unsafe -e 't:syscalls:sys_enter_nanosleep { system("ps -p %d\n", pid); }' Attaching 1 probe... PID TTY TIME CMD 685 ? 00:00:15 containerd PID TTY TIME CMD 685...

``` root@dev01:~# bpftrace -d -e 'k:vfs_read {@[pid]=count();}' Program kprobe:vfs_read = map: @ builtin: pid call: count ; ModuleID = 'bpftrace' source_filename = "bpftrace" target datalayout = "e-m:e-p:64:64-i64:64-n32:64-S128" target triple =...

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