目录
1.下载后切换到root
2.关机命令使用出现：System has not been booted with systemd as init system (PID 1). Can't operate.
使用场景描述：
心血来潮使用windows下的wsl进行使用练习，随便玩玩；安装了ubuntu
1.下载后切换到root
“ubuntu 默认的 root 用户是没有固定密码的,它的密码是随机产生并且动态改变的,即每次开机都有一个新的 root 密码,如果想查看 root 密码,那么直接设置的 root 密码即可。”
所以：刚下载的ubuntu是没有root密码的，而且是随机的。。。
1. sudo passwd
2.su root
hml@LAPTOP-9M23AK3R:/$ sudo passwd
[sudo] password for hml:
New password:
Retype new password:
passwd: password updated successfully
hml@LAPTOP-9M23AK3R:/$ su root
Password:
root@LAPTOP-9M23AK3R:/#2.关机命令使用出现：System has not been booted with systemd as init system (PID 1). Can't operate.
使用描述：poweroff ，shutdown都尝试无效，切换到root下也无效
root@LAPTOP-9M23AK3R:/# shutdown
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down
Failed to talk to init daemon.
root@LAPTOP-9M23AK3R:/# poweroff
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down
Failed to talk to init daemon.
root@LAPTOP-9M23AK3R:/# logout
bash: logout: not login shell: use `exit'
root@LAPTOP-9M23AK3R:/# reboot
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down
Failed to talk to init daemon.解决方案：翻译错误描述：systemd作为init系统(PID 1)，系统尚未启动，无法操作。
猜测：shutdown，poweroff，reboot命令使用需要安装并启动systemd
1.什么是systemd（看看就行）
systemd即为system daemon,是linux下的一种init软件,由Lennart Poettering带头开发,并在LGPL 2.1及其后续版本许可证下开源发布,开发目标是提供更优秀的框架以表示系统服务间的依赖关系，并依此实现系统初始化时服务的并行启动，同时达到降低Shell的系统开销的效果，最终代替常用的System V与BSD风格init程序。
与多数发行版使用的System V风格init相比，systemd采用了以下新技术： (1) 采用Socket激活式与总线激活式服务，以提高相互依赖的各服务的并行运行性能； (2) 用Cgroups代替PID来追踪进程，因此即使是两次fork之后生成的守护进程也不会脱离systemd的控。
别人的解释：
systemd是一个跟随开发板的系统预装工具，用来管理软件启动和停止，一般来说ubuntu16以及以上的版本基本都有这个预装工具。如果系统已经预装了systemd，那么就可以用它来管理进程，反之如果没有，即使安装了，也不会被默认配置为系统管理工具。
2.确定是否安装，最好在root下，或者命令前面加sudo
systemctl --version 或者 systemd --version
systemd --version
root@LAPTOP-9M23AK3R:/# systemd --version
systemd 245 (245.4-4ubuntu3)
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=hybrid
root@LAPTOP-9M23AK3R:/# systemctl --version
systemd 245 (245.4-4ubuntu3)
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=hybrid3.查看systemd服务运行状态
systemctl是最核心的命令，用于系统管理。
查看系统状态：systemctl status
root@LAPTOP-9M23AK3R:/# systemctl status
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down重启系统：systemctl reboot
关机：systemctl poweroff
停止cpu命令：systemctl halt
哪天有空了再写一篇关于这个命令的博客//TODO
启动，停止，重启服务：
systemctl start myservice.service
systemctl stop myservice.service
systemctl restart myservice.service
root@LAPTOP-9M23AK3R:/# systemctl start myservice.service
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down
root@LAPTOP-9M23AK3R:/# hostnamectl
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to create bus connection: Host is down
root@LAPTOP-9M23AK3R:/# service start
start: unrecognized service
root@LAPTOP-9M23AK3R:/# service start myservice.service
start: unrecognized service
root@LAPTOP-9M23AK3R:/# service httpd start
httpd: unrecognized service报错了，所以这个不对；而且参考百度说的是wsl2使用需要更换命令，用SysV init的命令代替systemd，
就是这个，失败了可能我是用的方式不太对，希望大佬指出；
//这不他妈的又能写一篇SysV init 巨复杂TODO；
3.这个时候想起了初衷，安装的systemd在 /etc下
或者直接找 find / -name 'systemd'
root@LAPTOP-9M23AK3R:/etc/init.d# find / -name 'systemd'
/etc/systemd
/etc/xdg/systemd进入里面发现自启动方式过于复杂，下载的版本缺少wifi执行脚本
可以参考一下：
docs/0007_Systemd进程启动.md · LowLevelOfLogic/RaspberryPi - Gitee.com
用上面的方法没成功，太菜了，理解不了，来个大佬教教我
最后解决方法：
由于是在windows商店直接下载的ubuntu，可能版本原因没有与wsl2对应的支持systemd启动脚本
所以直接在百度上下载一个支持的脚本即可；
1.首先安装git
sudo apt install git2.获得脚本并运行
git clone https://github.com/DamionGans/ubuntu-wsl2-systemd-script.git
cd ubuntu-wsl2-systemd-script/
bash ubuntu-wsl2-systemd-script.sh3.重新启动ubuntu，关闭powershell即可（一定要在上面的执行成功后）
4.重新进入powershell ，进入ubuntu，执行systemctl
5.测试poweroff命令使用完成
不支持ifconfig
下载一波就完事了，提示人家都给
hml@LAPTOP-9M23AK3R:/$ ifconfig
Command 'ifconfig' not found, but can be installed with:
sudo apt install net-tools
hml@LAPTOP-9M23AK3R:/$ sudo apt install net-tools
[sudo] password for hml:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
net-tools
0 upgraded, 1 newly installed, 0 to remove and 261 not upgraded.
Need to get 196 kB of archives.
After this operation, 864 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu focal/main amd64 net-tools amd64 1.60+git20180626.aebd88e-1ubuntu1 [196 kB]
Fetched 196 kB in 3s (62.9 kB/s)
Selecting previously unselected package net-tools.
(Reading database ... 31871 files and directories currently installed.)
Preparing to unpack .../net-tools_1.60+git20180626.aebd88e-1ubuntu1_amd64.deb ...
Unpacking net-tools (1.60+git20180626.aebd88e-1ubuntu1) ...
Setting up net-tools (1.60+git20180626.aebd88e-1ubuntu1) ...
Processing triggers for man-db (2.9.1-1) ...
hml@LAPTOP-9M23AK3R:/$
hml@LAPTOP-9M23AK3R:/$ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.28.11.48 netmask 255.255.240.0 broadcast 172.28.15.255
inet6 fe80::215:5dff:fe35:9a22 prefixlen 64 scopeid 0x20<link>
ether 00:15:5d:35:9a:22 txqueuelen 1000 (Ethernet)
RX packets 498 bytes 244166 (244.1 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 244 bytes 18968 (18.9 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
