计算机技术学习记录

Category: tool

碰到的有意思工具

  • outline accesskey format

    ss://base64(method:passwod)@server-address:port

  • powershell 4.0 安装包下载地址

    {
   "WMF3": {
      "Win7": {
        "x86": "https://download.microsoft.com/download/E/7/6/E76850B8-DA6E-4FF5-8CCE-A24FC513FD16/Windows6.1-KB2506143-x86.msu",
        "x64": "https://download.microsoft.com/download/E/7/6/E76850B8-DA6E-4FF5-8CCE-A24FC513FD16/Windows6.1-KB2506143-x64.msu"
      }
   },
   "DotNet4": "https://download.microsoft.com/download/1/B/E/1BE39E79-7E39-46A3-96FF-047F95396215/dotNetFx40_Full_setup.exe",
   "WMF4": {
      "Win7": {
        "x64": "https://download.microsoft.com/download/3/D/6/3D61D262-8549-4769-A660-230B67E15B25/Windows6.1-KB2819745-x64-MultiPkg.msu",
        "x86": "https://download.microsoft.com/download/3/D/6/3D61D262-8549-4769-A660-230B67E15B25/Windows6.1-KB2819745-x86-MultiPkg.msu"
      },
      "Server2012": "https://download.microsoft.com/download/3/D/6/3D61D262-8549-4769-A660-230B67E15B25/Windows8-RT-KB2799888-x64.msu"
   },
   "WMF5": {
      "Server2008R2": "https://download.microsoft.com/download/2/C/6/2C6E1B4A-EBE5-48A6-B225-2D2058A9CEFB/Win7AndW2K8R2-KB3134760-x64.msu",
      "Server2012": "https://download.microsoft.com/download/2/C/6/2C6E1B4A-EBE5-48A6-B225-2D2058A9CEFB/W2K12-KB3134759-x64.msu",
      "Server2012R2": "https://download.microsoft.com/download/2/C/6/2C6E1B4A-EBE5-48A6-B225-2D2058A9CEFB/Win8.1AndW2K12R2-KB3134758-x64.msu",
      "Win7": {
         "x64": "https://download.microsoft.com/download/2/C/6/2C6E1B4A-EBE5-48A6-B225-2D2058A9CEFB/Win7AndW2K8R2-KB3134760-x64.msu",
         "x86": "https://download.microsoft.com/download/2/C/6/2C6E1B4A-EBE5-48A6-B225-2D2058A9CEFB/Win7-KB3134760-x86.msu"
      },
      "Win81": {
         "x64": "https://download.microsoft.com/download/2/C/6/2C6E1B4A-EBE5-48A6-B225-2D2058A9CEFB/Win8.1AndW2K12R2-KB3134758-x64.msu",
         "x86": "https://download.microsoft.com/download/2/C/6/2C6E1B4A-EBE5-48A6-B225-2D2058A9CEFB/Win8.1-KB3134758-x86.msu"
      }
   },
   "WMF51": {
      "Server2012": "https://download.microsoft.com/download/6/F/5/6F5FF66C-6775-42B0-86C4-47D41F2DA187/W2K12-KB3191565-x64.msu",
      "Server2012R2": "https://download.microsoft.com/download/6/F/5/6F5FF66C-6775-42B0-86C4-47D41F2DA187/Win8.1AndW2K12R2-KB3191564-x64.msu",
      "Win81": {
         "x64": "https://download.microsoft.com/download/6/F/5/6F5FF66C-6775-42B0-86C4-47D41F2DA187/Win8.1AndW2K12R2-KB3191564-x64.msu",
         "x86": "https://download.microsoft.com/download/6/F/5/6F5FF66C-6775-42B0-86C4-47D41F2DA187/Win8.1-KB3191564-x86.msu"
      }
   }
}

  • iscsiadm用法

    iscsiadm 用法

    data from

    Understanding iscsiadm Utility in CentOS / RHEL
    Discovering iSCSI targets using Send Targets

    mode

    Use the iscsiadm utility to update, delete, insert, and query the persistent database. Also use this utility to establish a session between a target and an initiator. Several different operational modes are available for the command.

    • discoverydb: Updates or queries the Open-iSCSI database records
    • discovery: Performs a discovery operation
    • node: Performs an operation on a portal (IP:port) on an iSCSI target
    • session: Performs an operation on a TCP connection between an initiator and a target
    • iface: Performs an operation on a network interface

    Additional options to iscsiadm include:

    • -type – Specify the discover type.
    • -portal – Specify the iSCSI target portal.

    (more…)

  • 结合vmstat分析iostat输出结果

    man vmstat

    FIELD DESCRIPTION FOR VM MODE

    Procs

    • r: The number of processes waiting for run time.

      r 表示运行队列 (就是说多少个进程真的分配到CPU). 当这个值超过了CPU数目, 就会出现CPU瓶颈.

    • b: The number of processes in uninterruptible sleep.

    Memory

    • swpd: the amount of virtual memory used.
    • free: the amount of idle memory.
    • buff: the amount of memory used as buffers.
    • cache: the amount of memory used as cache.
    • inact: the amount of inactive memory. (-a option)
    • active: the amount of active memory. (-a option)

    Swap

    • si: Amount of memory swapped in from disk (/s).
    • so: Amount of memory swapped to disk (/s).

    IO

    • bi: Blocks received from a block device (blocks/s).
    • bo: Blocks sent to a block device (blocks/s).

    System

    • in: The number of interrupts per second, including the clock.
    • cs: The number of context switches per second.

    CPU

    • These are percentages of total CPU time.
    • us: Time spent running non-kernel code. (user time, including nice time)
    • sy: Time spent running kernel code. (system time)
    • id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time.

    • wa: Time spent waiting for IO. Prior to Linux 2.5.41, included in idle.

      wa 列显示了IO等待所占用的CPU时间的百分比。这里wa的参考值为30%，如果wa超过30%，说明IO等待严重，这可能是磁盘大量随机访问造成的，也可能磁盘或者磁盘访问控制器的带宽瓶颈造成的(主要是块操作)

    • st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown.

  • 创建intellij idea启动图标

    centos上创建intellij idea启动图标

    Pycharm

    # cat /usr/share/applications/pycharm.desktop 
[Desktop Entry]
Name=Pycharm
GenericName=Pycharm
Comment=Pycharm2019:The Python IDE
Exec=sh /wjhdata/pycharm-community-2019.1.3/bin/pycharm.sh 
Icon=/wjhdata/pycharm-community-2019.1.3/bin/pycharm.png
Terminal=false
Type=Application
Categories=Utility;Application

    IntelliJ IDEA

    # cat /usr/share/applications/intellij.desktop
[Desktop Entry]
Name=IntelliJ IDEA
Comment=IntelliJ IDEA
Exec=sh /wjhdata/idea-IC-191.7479.19/bin/idea.sh
Icon=/wjhdata/idea-IC-191.7479.19/bin/idea.png
Terminal=false
Type=Application
Categories=Utility;Application