ubuntu 找不到 syslog.service_ubuntu没有syslog

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前言

关于使用命令 systemctl disable syslog.service 之后， systemctl enable syslog.service 命令失败的问题：

root@backvm-virtual-machine:~# systemctl  enable  syslog.service
Failed to execute operation: No such file or directory
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一、syslog.service 名字找不到

通过网上查找，看到这么一条信息：

于是尝试执行命令，使用 rsyslog.service：

root@backvm-virtual-machine:~# systemctl  enable  rsyslog.service 
Synchronizing state of rsyslog.service with SysV init with /lib/systemd/systemd-sysv-install...
Executing /lib/systemd/systemd-sysv-install enable rsyslog
Created symlink from /etc/systemd/system/syslog.service to /lib/systemd/system/rsyslog.service.
root@backvm-virtual-machine:~# 
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二、探究

查看一下当前系统的syslog.service 服务

root@backvm-virtual-machine:~# ls /etc/systemd/system -l
总用量 100
drwxr-xr-x 2 root root 4096 2月  27  2019 suspend.target.wants
drwxr-xr-x 2 root root 4096 5月  20  2020 sysinit.target.wants
lrwxrwxrwx 1 root root   35 8月  26 23:56 syslog.service -> /lib/systemd/system/rsyslog.service
drwxr-xr-x 2 root root 4096 2月  27  2019 timers.target.wants
root@backvm-virtual-machine:~# 
root@backvm-virtual-machine:~# 
root@backvm-virtual-machine:~# systemctl status  syslog.service 
● rsyslog.service - System Logging Service
   Loaded: loaded (/lib/systemd/system/rsyslog.service; enabled; vendor preset: enabled)
   Active: active (running) since 五 2022-08-26 23:48:31 CST; 58min ago
     Docs: man:rsyslogd(8)
           http://www.rsyslog.com/doc/
 Main PID: 27572 (rsyslogd)
   CGroup: /system.slice/rsyslog.service
           └─27572 /usr/sbin/rsyslogd -n

8月 26 23:48:30 backvm-virtual-machine systemd[1]: Stopped System Logging Service.
8月 26 23:48:31 backvm-virtual-machine systemd[1]: Starting System Logging Service...
8月 26 23:48:31 backvm-virtual-machine systemd[1]: Started System Logging Service.
root@backvm-virtual-machine:~# 
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可以看到，syslog.service 指向 /lib/systemd/system/rsyslog.service。
且 syslog.service 服务运行正常。

我们 cat 查看一下 syslog.service 和 rsyslog.service 两个配置文件有什么区别：

root@backvm-virtual-machine:~# systemctl cat syslog.service 
# /lib/systemd/system/rsyslog.service
[Unit]
Description=System Logging Service
Requires=syslog.socket
Documentation=man:rsyslogd(8)
Documentation=http://www.rsyslog.com/doc/

[Service]
Type=notify
ExecStart=/usr/sbin/rsyslogd -n
StandardOutput=null
Restart=on-failure

[Install]
WantedBy=multi-user.target
Alias=syslog.service
root@backvm-virtual-machine:~#
root@backvm-virtual-machine:~#
root@backvm-virtual-machine:~# systemctl cat rsyslog.service 
# /lib/systemd/system/rsyslog.service
[Unit]
Description=System Logging Service
Requires=syslog.socket
Documentation=man:rsyslogd(8)
Documentation=http://www.rsyslog.com/doc/

[Service]
Type=notify
ExecStart=/usr/sbin/rsyslogd -n
StandardOutput=null
Restart=on-failure

[Install]
WantedBy=multi-user.target
Alias=syslog.service
root@backvm-virtual-machine:~# 
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通过文件内容，可以看到，原来是 rsyslog.service 指定了别名为：syslog.service。

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