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get_md5_hex_str(Str) ->
    X = erlang:md5(Str),
    [begin if N < 10 -> 48 + N; true -> 87 + N end end || <<N:4>> <= X].

ChinaXing

# -------------- trace script Java source  ---------------- #
import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;
import com.sun.btrace.AnyType;

@BTrace // (trusted=true)
public class Test {
        @OnMethod(
                clazz="java.net.ServerSocket",
                method="bind"

ChinaXing

yum erase ais-vnic -y # 卸载ali-vnic
yum install teamd -y
systemctl daemon-reload # systemctl 更新配置
modprobe bonding # teamd依赖
modprobe team # teamd依赖的驱动
ip link del bond0 # 删除bond 驱动新增的网卡
systemctl restart network # 启动网络，teamd 后台进程会启动 ps auxf | grep teamd 查看确认

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-- 分析 unreachable对象 https://wiki.eclipse.org/MemoryAnalyzer/FAQ#How_to_analyse_unreachable_objects
-consoleLog -application org.eclipse.mat.api.parse -keep_unreachable_objects  <heapDump.bin>
-- 查询 非unreachable的对象，GCRootInfo null 表名此对象非GcRoot，MAT keepunreachable 对象时，unreachable对象的gcroot是自身
SELECT * FROM byte[] s WHERE ((s.@length >= 2000000) and (s.@GCRootInfo = null))

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show pid namespace all threads of process 21503

ps axH -opid,ppid,pidns -p 21503

list namespace of process 21503

lsns -p 21503

list namespace inode of process 21503

ls -iL /proc/21503/ns/pid

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grant codebase "file:${java.home}/../lib/tools.jar" {
    permission java.security.AllPermission;
};

jstatd -J-Djava.security.policy=jstatd.all.policy

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import com.sun.tools.attach.VirtualMachine;
import com.sun.tools.attach.VirtualMachineDescriptor;
import java.util.List;

public class ListVM{
  public static void main(String[] args){
        List<VirtualMachineDescriptor> vmList = VirtualMachine.list();
        for(VirtualMachineDescriptor vm : vmList){
		System.out.println("name: " + vm.displayName() + " id :" + vm.id());
		try{

ChinaXing

#!/bin/env bash

# --------------------------------------------
#
# 网络丢包模拟工具
#
# --------------------------------------------

block(){
  interface=$1

ChinaXing

import com.sun.btrace.annotations.*;
import com.sun.btrace.AnyType;
import static com.sun.btrace.BTraceUtils.*;

@BTrace
public class Q{
   @OnMethod(
     clazz="java.nio.Buffer",
     method="/.*/",
     location=@Location(value=Kind.FIELD_SET, clazz="java.nio.Buffer", field="po

ChinaXing

import com.sun.btrace.annotations.*;
import com.sun.btrace.AnyType;
import static com.sun.btrace.BTraceUtils.*;

@BTrace
public class Q{
   @OnMethod(
     clazz="java.nio.Buffer",
     method="/.*/",
     location=@Location(value=Kind.FIELD_SET, clazz="java.nio.Buffer", field="po