systemctl启停服务时报错的代码

systemd-specific exit codes

LSB service exit codes

Exit Code	Symbolic Name	Description
2	EXIT_INVALIDARGUMENT	Invalid or excess arguments.
3	EXIT_NOTIMPLEMENTED	Unimplemented feature.
4	EXIT_NOPERMISSION	The user has insufficient privileges.
5	EXIT_NOTINSTALLED	The program is not installed.
6	EXIT_NOTCONFIGURED	The program is not configured.
7	EXIT_NOTRUNNING	The program is not running.

systemd-specific exit codes

Exit Code	Symbolic Name	Description
200	EXIT_CHDIR	Changing to the requested working directory failed. See WorkingDirectory= above.
201	EXIT_NICE	Failed to set up process scheduling priority (nice level). See Nice= above.
202	EXIT_FDS	Failed to close unwanted file descriptors, or to adjust passed file descriptors.
203	EXIT_EXEC	The actual process execution failed (specifically, the execve(2) system call). Most likely this is caused by a missing or non-accessible executable file.
204	EXIT_MEMORY	Failed to perform an action due to memory shortage.
205	EXIT_LIMITS	Failed to adjust resource limits. See LimitCPU= and related settings above.
206	EXIT_OOM_ADJUST	Failed to adjust the OOM setting. See OOMScoreAdjust= above.
207	EXIT_SIGNAL_MASK	Failed to set process signal mask.
208	EXIT_STDIN	Failed to set up standard input. See StandardInput= above.
209	EXIT_STDOUT	Failed to set up standard output. See StandardOutput= above.
210	EXIT_CHROOT	Failed to change root directory (chroot(2)). See RootDirectory=/RootImage= above.
211	EXIT_IOPRIO	Failed to set up IO scheduling priority. See IOSchedulingClass=/IOSchedulingPriority= above.
212	EXIT_TIMERSLACK	Failed to set up timer slack. See TimerSlackNSec= above.
213	EXIT_SECUREBITS	Failed to set process secure bits. See SecureBits= above.
214	EXIT_SETSCHEDULER	Failed to set up CPU scheduling. See CPUSchedulingPolicy=/CPUSchedulingPriority= above.
215	EXIT_CPUAFFINITY	Failed to set up CPU affinity. See CPUAffinity= above.
216	EXIT_GROUP	Failed to determine or change group credentials. See Group=/SupplementaryGroups= above.
217	EXIT_USER	Failed to determine or change user credentials, or to set up user namespacing. See User=/PrivateUsers= above.
218	EXIT_CAPABILITIES	Failed to drop capabilities, or apply ambient capabilities. See CapabilityBoundingSet=/AmbientCapabilities= above.
219	EXIT_CGROUP	Setting up the service control group failed.
220	EXIT_SETSID	Failed to create new process session.
221	EXIT_CONFIRM	Execution has been cancelled by the user. See the systemd.confirm_spawn= kernel command line setting on kernel-command-line(7) for details.
222	EXIT_STDERR	Failed to set up standard error output. See StandardError= above.
224	EXIT_PAM	Failed to set up PAM session. See PAMName= above.
225	EXIT_NETWORK	Failed to set up network namespacing. See PrivateNetwork= above.
226	EXIT_NAMESPACE	Failed to set up mount, UTS, or IPC namespacing. See ReadOnlyPaths=, ProtectHostname=, PrivateIPC=, and related settings above.
227	EXIT_NO_NEW_PRIVILEGES	Failed to disable new privileges. See NoNewPrivileges=yes above.
228	EXIT_SECCOMP	Failed to apply system call filters. See SystemCallFilter= and related settings above.
229	EXIT_SELINUX_CONTEXT	Determining or changing SELinux context failed. See SELinuxContext= above.
230	EXIT_PERSONALITY	Failed to set up an execution domain (personality). See Personality= above.
231	EXIT_APPARMOR_PROFILE	Failed to prepare changing AppArmor profile. See AppArmorProfile= above.
232	EXIT_ADDRESS_FAMILIES	Failed to restrict address families. See RestrictAddressFamilies= above.
233	EXIT_RUNTIME_DIRECTORY	Setting up runtime directory failed. See RuntimeDirectory= and related settings above.
235	EXIT_CHOWN	Failed to adjust socket ownership. Used for socket units only.
236	EXIT_SMACK_PROCESS_LABEL	Failed to set SMACK label. See SmackProcessLabel= above.
237	EXIT_KEYRING	Failed to set up kernel keyring.
238	EXIT_STATE_DIRECTORY	Failed to set up unit's state directory. See StateDirectory= above.
239	EXIT_CACHE_DIRECTORY	Failed to set up unit's cache directory. See CacheDirectory= above.
240	EXIT_LOGS_DIRECTORY	Failed to set up unit's logging directory. See LogsDirectory= above.
241	EXIT_CONFIGURATION_DIRECTORY	Failed to set up unit's configuration directory. See ConfigurationDirectory= above.
242	EXIT_NUMA_POLICY	Failed to set up unit's NUMA memory policy. See NUMAPolicy= and NUMAMask= above.
243	EXIT_CREDENTIALS	Failed to set up unit's credentials. See LoadCredential= and SetCredential= above.
245	EXIT_BPF	Failed to apply BPF restrictions. See RestrictFileSystems= above.

BSD exit codes

Exit Code	Symbolic Name	Description
64	EX_USAGE	Command line usage error
65	EX_DATAERR	Data format error
66	EX_NOINPUT	Cannot open input
67	EX_NOUSER	Addressee unknown
68	EX_NOHOST	Host name unknown
69	EX_UNAVAILABLE	Service unavailable
70	EX_SOFTWARE	internal software error
71	EX_OSERR	System error (e.g., can't fork)
72	EX_OSFILE	Critical OS file missing
73	EX_CANTCREAT	Can't create (user) output file
74	EX_IOERR	Input/output error
75	EX_TEMPFAIL	Temporary failure; user is invited to retry
76	EX_PROTOCOL	Remote error in protocol
77	EX_NOPERM	Permission denied
78	EX_CONFIG	Configuration error

查看服务脚本内容 （以sshd服务为示例）： systemctl cat sshd

# /usr/lib/systemd/system/sshd.service
[Unit]
Description=OpenSSH server daemon
Documentation=man:sshd(8) man:sshd_config(5)
After=network.target sshd-keygen.service
Wants=sshd-keygen.service

[Service]
Type=notify
EnvironmentFile=/etc/sysconfig/sshd
ExecStart=/usr/sbin/sshd -D $OPTIONS
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
RestartSec=42s

[Install]
WantedBy=multi-user.target

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