如果我使用 grep 运行，服务就会出现在输出中
[root@maincore ~]# systemctl status --all | grep charon
│ │ └─135060 grep --color=auto charon
│ └─127087 /usr/sbin/charon-systemd
Unit boot.automount could not be found.
Unit boot.mount could not be found.
Unit sysroot.mount could not be found.
└─135060 grep --color=auto charon
Unit display-manager.service could not be found.
Unit ipa.service could not be found.
Unit krb5kdc.service could not be found.
Unit ntpd.service could not be found.
Unit ntpdate.service could not be found.
Unit postgresql.service could not be found.
Unit sntp.service could not be found.
Main PID: 127087 (charon-systemd)
Status: "charon-systemd running, strongSwan 5.8.2, Linux 4.18.0-240.1.1.el8_3.x86_64, x86_64"
└─127087 /usr/sbin/charon-systemd
Jan 24 16:41:48 maincore charon-systemd[127087]: generating IKE_AUTH response 1 [ IDr CERT AUTH EAP/REQ/ID ]
Jan 24 16:41:48 maincore charon-systemd[127087]: splitting IKE message (1856 bytes) into 2 fragments
Jan 24 16:41:48 maincore charon-systemd[127087]: generating IKE_AUTH response 1 [ EF(1/2) ]
Jan 24 16:41:48 maincore charon-systemd[127087]: generating IKE_AUTH response 1 [ EF(2/2) ]
Jan 24 16:41:48 maincore charon-systemd[127087]: sending packet: (1236 bytes)
Unit systemd-timesyncd.service could not be found.
Unit ypbind.service could not be found.
Unit yppasswdd.service could not be found.
Unit ypserv.service could not be found.
Unit ypxfrd.service could not be found.
│ │ └─127087 /usr/sbin/charon-systemd
│ └─135060 grep --color=auto charon
│ └─127087 /usr/sbin/charon-systemd
│ └─135060 grep --color=auto charon
│ └─135060 grep --color=auto charon
Unit dirsrv.target could not be found.
Unit syslog.target could not be found.
但是如果我将单元名称直接放入 systemctl 或 journalctl 中，它不起作用
[root@maincore ~]# systemctl status charon-systemd
Unit charon-systemd.service could not be found.
[root@maincore ~]# journalctl -u charon-systemd
-- Logs begin at Thu 2021-01-21 19:48:23 UTC, end at Mon 2021-01-25 00:29:45 UTC. --
-- No entries --
charon-systemd 服务有日志。出了什么问题？
[root@maincore ~]# systemctl list-units -t service
UNIT LOAD ACTIVE SUB DESCRIPTION
auditd.service loaded active running Security Auditing Service
chronyd.service loaded active running NTP client/server
crond.service loaded active running Command Scheduler
dbus.service loaded active running D-Bus System Message Bus
dracut-shutdown.service loaded active exited Restore /run/initramfs on shutdown
[email protected] loaded active running Getty on tty1
import-state.service loaded active exited Import network configuration from initramfs
irqbalance.service loaded active running irqbalance daemon
kdump.service loaded active exited Crash recovery kernel arming
kmod-static-nodes.service loaded active exited Create list of required static device nodes for the current kernel
loadmodules.service loaded active exited Load legacy module configuration
mariadb.service loaded active running MariaDB 10.3 database server
network.service loaded active exited LSB: Bring up/down networking
● nginx.service loaded failed failed The nginx HTTP and reverse proxy server
nis-domainname.service loaded active exited Read and set NIS domainname from /etc/sysconfig/network
php-fpm.service loaded active running The PHP FastCGI Process Manager
plymouth-quit-wait.service loaded active exited Hold until boot process finishes up
plymouth-quit.service loaded active exited Terminate Plymouth Boot Screen
plymouth-read-write.service loaded active exited Tell Plymouth To Write Out Runtime Data
plymouth-start.service loaded active exited Show Plymouth Boot Screen
polkit.service loaded active running Authorization Manager
radiusd.service loaded active running FreeRADIUS high performance RADIUS server.
rngd-wake-threshold.service loaded active exited Hardware RNG Entropy Gatherer Wake threshold service
rngd.service loaded active running Hardware RNG Entropy Gatherer Daemon
rsyslog.service loaded active running System Logging Service
sshd.service loaded active running OpenSSH server daemon
sssd.service loaded active running System Security Services Daemon
strongswan.service loaded active running strongSwan IPsec IKEv1/IKEv2 daemon using swanctl
systemd-fsck-root.service loaded active exited File System Check on Root Device
systemd-journal-flush.service loaded active exited Flush Journal to Persistent Storage
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
systemd-random-seed.service loaded active exited Load/Save Random Seed
systemd-remount-fs.service loaded active exited Remount Root and Kernel File Systems
systemd-sysctl.service loaded active exited Apply Kernel Variables
systemd-tmpfiles-setup-dev.service loaded active exited Create Static Device Nodes in /dev
systemd-tmpfiles-setup.service loaded active exited Create Volatile Files and Directories
systemd-udev-trigger.service loaded active exited udev Coldplug all Devices
systemd-udevd.service loaded active running udev Kernel Device Manager
systemd-update-utmp.service loaded active exited Update UTMP about System Boot/Shutdown
systemd-user-sessions.service loaded active exited Permit User Sessions
tuned.service loaded active running Dynamic System Tuning Daemon
[email protected] loaded active exited /run/user/1000 mount wrapper
[email protected] loaded active running User Manager for UID 1000
[root@maincore ~]# systemctl list-unit-files | grep charon
[root@maincore ~]#
答案1
您混淆了进程的名称和启动该进程的 systemd 服务的名称。它们之间不一定有任何关系。
要查找负责正在运行的进程的 systemd 服务，请将其 PID 提供给systemctl status：
systemctl status <PID>
例如，您似乎对 PID 为 127087 的进程感兴趣charon-systemd，因此您可以运行：
systemctl status 127087
现在您可以看到实际的服务名称及其状态。