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Setuid
File modes The setuid and setgid bits are normally represented as the values 4 for setuid and 2 for setgid in the high-order octal digit of the file mode. For...
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Tcp Error Ack
如果 tcp 数据里面的 ack 是错误的，会发生什么呢？
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Golang Broken Pipe
https://gosamples.dev/broken-pipe/ package main import ( "errors" "log" "net" "os" "syscall" "time" ) func server() { listener, err := net.Listen("tcp", ":8080") if err != nil { log.Fatal(err) } defer listener.Close() conn,...
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Prlimit
prlimit 可以通过系统调用更改一下进程的 limit 值。 /proc/pid/limit 查看进程 limit
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Soft Hard Limit In Linux
https://docs.oracle.com/cd/E19455-01/805-7229/6j6q8svfe/index.html You can set both soft and hard limits. The system will not allow a user to exceed his or her hard limit. However, a system administrator may set a...
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Core
core(5) — Linux manual page 官方手册里面讲了 core dump 的一些配置和行为特征，简单总结一下。 什么情况下，不会生成 core dump。 core dump 的名字配置 /proc/sys/kernel/core_pattern 主要通过这个配置 /proc/sys/kernel/core_uses_pid 一个更基础（更简单？）的配置 但这里有些疑惑，如果 pattern 不是用的默认值，那 used_pid 是不是还生效呢？ 将 core 文件管道到另外的程序 哪些 mapping 可以被写到...
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Linux Memory Contoller
Memory Resource Controller - The Linux Kernel documentation Each cgroup maintains a per cgroup LRU which has the same structure as global VM. When a cgroup goes over its limit,...
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Sb
你怎么傻逼都行，但请不要连累我。
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Kafka Healer
https://programmer.group/kafka-golang-client-introduction.html 看到一篇文章，里面有一点点提到了 healer，这介绍还真的是非常准确。 Client name Advantages and disadvantages sarama The number of users is relatively large, but it is relatively difficult to use, with better performance confluent-kafka-go The encapsulation of...
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jsonpath 里面的转义
如果一个字段名字带点，可以这样转义 kd get pod -n redis 808098-2 -o jsonpath="{['metadata']['labels']['statefulset\.kubernetes\.io/pod-name']}" 如果要输出换行要： kd get pod -n redis 808098-2 -o jsonpath="{['metadata']['labels']['statefulset\.kubernetes\.io/pod-name']} {'\n'}"