解决linux的开机启动不生效

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近偶然间发现加到 /etc/rc.local中的开机启动命令没有生效，于是排查了一下解决了，记录一下处理的过程

主要步骤

  1. ls /lib/systemd/system 你可以看到有很多启动脚本，其中就有我们需要的 rc.local.service

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    cat /lib/systemd/system/rc.local.service

    #  This file is part of systemd.
    #
    #  systemd is free software; you can redistribute it and/or modify it
    #  under the terms of the GNU Lesser General Public License as published by
    #  the Free Software Foundation; either version 2.1 of the License, or
    #  (at your option) any later version.

    # This unit gets pulled automatically into multi-user.target by
    # systemd-rc-local-generator if /etc/rc.local is executable.
    [Unit]
    Description=/etc/rc.local Compatibility
    ConditionFileIsExecutable=/etc/rc.local
    After=network.target

    [Service]
    Type=forking
    ExecStart=/etc/rc.local start
    TimeoutSec=0
    RemainAfterExit=yes

  2. 创建 /etc/rc.local把需要启动命令写进去

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    vim /etc/rc.local


    #!/bin/sh -e
    #
    # rc.local
    #
    # This script is executed at the end of each multiuser runlevel.
    # Make sure that the script will "exit 0" on success or any other
    # value on error.
    #
    # In order to enable or disable this script just change the execution
    # bits.
    #
    # By default this script does nothing.

    # 这里写你需要执行的命令
    # 注意: 一定要将命令添加在 exit 0之前

    exit 0

    注：

    • debian10默认是没有这个文件，直接创建保存。
    • 主要就是第一句和最后一句

  3. 赋予执行权限，否则的话会导致开机后不运行

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    sudo chmod +x /etc/rc.local

  4. 在/etc/systemd/system 目录下创建软链接

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    ln -s /lib/systemd/system/rc.local.service /etc/systemd/system/

  5. reboot测试是否生效