NAME
systemd-analyze - Analyze and debug system managerSYNOPSIS
systemd-analyze
[OPTIONS...] [time]
systemd-analyze
[OPTIONS...] blame
systemd-analyze
[OPTIONS...] critical-chain [ UNIT...]
systemd-analyze
[OPTIONS...] dump [ PATTERN...]
systemd-analyze
[OPTIONS...] plot [>file.svg]
systemd-analyze
[OPTIONS...] dot [ PATTERN...] [>file.dot]
systemd-analyze
[OPTIONS...] unit-files
systemd-analyze
[OPTIONS...] unit-paths
systemd-analyze
[OPTIONS...] exit-status [ STATUS...]
systemd-analyze
[OPTIONS...] capability [ CAPABILITY...]
systemd-analyze
[OPTIONS...] condition CONDITION...
systemd-analyze
[OPTIONS...] syscall-filter [ SET...]
systemd-analyze
[OPTIONS...] filesystems [ SET...]
systemd-analyze
[OPTIONS...] calendar SPEC...
systemd-analyze
[OPTIONS...] timestamp TIMESTAMP...
systemd-analyze
[OPTIONS...] timespan SPAN...
systemd-analyze
[OPTIONS...] cat-config NAME|PATH...
systemd-analyze
[OPTIONS...] compare-versions VERSION1 [OP]
VERSION2
systemd-analyze
[OPTIONS...] verify [ FILE...]
systemd-analyze
[OPTIONS...] security UNIT...
systemd-analyze
[OPTIONS...] inspect-elf FILE...
DESCRIPTION
systemd-analyze may be used to determine system boot-up performance statistics and retrieve other state and tracing information from the system and service manager, and to verify the correctness of unit files. It is also used to access special functions useful for advanced system manager debugging. If no command is passed, systemd-analyze time is implied.systemd-analyze time
This command prints the time spent in the kernel before userspace has been reached, the time spent in the initrd before normal system userspace has been reached, and the time normal system userspace took to initialize. Note that these measurements simply measure the time passed up to the point where all system services have been spawned, but not necessarily until they fully finished initialization or the disk is idle. Example 1. Show how long the boot took# in a container $ systemd-analyze time Startup finished in 296ms (userspace) multi-user.target reached after 275ms in userspace # on a real machine $ systemd-analyze time Startup finished in 2.584s (kernel) + 19.176s (initrd) + 47.847s (userspace) = 1min 9.608s multi-user.target reached after 47.820s in userspace
systemd-analyze blame
This command prints a list of all running units, ordered by the time they took to initialize. This information may be used to optimize boot-up times. Note that the output might be misleading as the initialization of one service might be slow simply because it waits for the initialization of another service to complete. Also note: systemd-analyze blame doesn't display results for services with Type=simple, because systemd considers such services to be started immediately, hence no measurement of the initialization delays can be done. Also note that this command only shows the time units took for starting up, it does not show how long unit jobs spent in the execution queue. In particular it shows the time units spent in "activating" state, which is not defined for units such as device units that transition directly from "inactive" to "active". This command hence gives an impression of the performance of program code, but cannot accurately reflect latency introduced by waiting for hardware and similar events. Example 2. Show which units took the most time during boot$ systemd-analyze blame 32.875s pmlogger.service 20.905s systemd-networkd-wait-online.service 13.299s dev-vda1.device ... 23ms sysroot.mount 11ms initrd-udevadm-cleanup-db.service 3ms sys-kernel-config.mount
systemd-analyze critical-chain [ UNIT...]
This command prints a tree of the time-critical chain of units (for each of the specified UNITs or for the default target otherwise). The time after the unit is active or started is printed after the "@" character. The time the unit takes to start is printed after the "+" character. Note that the output might be misleading as the initialization of services might depend on socket activation and because of the parallel execution of units. Also, similarly to the blame command, this only takes into account the time units spent in "activating" state, and hence does not cover units that never went through an "activating" state (such as device units that transition directly from "inactive" to "active"). Moreover it does not show information on jobs (and in particular not jobs that timed out). Example 3. systemd-analyze critical-chain$ systemd-analyze critical-chain multi-user.target @47.820s └─pmie.service @35.968s +548ms └─pmcd.service @33.715s +2.247s └─network-online.target @33.712s └─systemd-networkd-wait-online.service @12.804s +20.905s └─systemd-networkd.service @11.109s +1.690s └─systemd-udevd.service @9.201s +1.904s └─systemd-tmpfiles-setup-dev.service @7.306s +1.776s └─kmod-static-nodes.service @6.976s +177ms └─systemd-journald.socket └─system.slice └─-.slice
systemd-analyze dump [ pattern...]
Without any parameter, this command outputs a (usually very long) human-readable serialization of the complete service manager state. Optional glob pattern may be specified, causing the output to be limited to units whose names match one of the patterns. The output format is subject to change without notice and should not be parsed by applications. This command is rate limited for unprivileged users. Example 4. Show the internal state of user manager$ systemd-analyze --user dump Timestamp userspace: Thu 2019-03-14 23:28:07 CET Timestamp finish: Thu 2019-03-14 23:28:07 CET Timestamp generators-start: Thu 2019-03-14 23:28:07 CET Timestamp generators-finish: Thu 2019-03-14 23:28:07 CET Timestamp units-load-start: Thu 2019-03-14 23:28:07 CET Timestamp units-load-finish: Thu 2019-03-14 23:28:07 CET -> Unit proc-timer_list.mount: Description: /proc/timer_list ... -> Unit default.target: Description: Main user target ...
systemd-analyze plot
This command prints an SVG graphic detailing which system services have been started at what time, highlighting the time they spent on initialization. Example 5. Plot a bootchart$ systemd-analyze plot >bootup.svg $ eog bootup.svg&
systemd-analyze dot [ pattern...]
This command generates textual dependency graph description in dot format for further processing with the GraphViz dot(1) tool. Use a command line like systemd-analyze dot | dot -Tsvg >systemd.svg to generate a graphical dependency tree. Unless --order or --require is passed, the generated graph will show both ordering and requirement dependencies. Optional pattern globbing style specifications (e.g. *.target) may be given at the end. A unit dependency is included in the graph if any of these patterns match either the origin or destination node. Example 6. Plot all dependencies of any unit whose name starts with "avahi-daemon"$ systemd-analyze dot 'avahi-daemon.*' | dot -Tsvg >avahi.svg $ eog avahi.svg
$ systemd-analyze dot --to-pattern='*.target' --from-pattern='*.target' \ | dot -Tsvg >targets.svg $ eog targets.svg
systemd-analyze unit-paths
This command outputs a list of all directories from which unit files, .d overrides, and .wants, .requires symlinks may be loaded. Combine with --user to retrieve the list for the user manager instance, and --global for the global configuration of user manager instances. Example 8. Show all paths for generated units$ systemd-analyze unit-paths | grep '^/run' /run/systemd/system.control /run/systemd/transient /run/systemd/generator.early /run/systemd/system /run/systemd/system.attached /run/systemd/generator /run/systemd/generator.late
systemctl [--user] [--global] show -p UnitPath --value
systemd-analyze exit-status [ STATUS...]
This command prints a list of exit statuses along with their "class", i.e. the source of the definition (one of "glibc", "systemd", "LSB", or "BSD"), see the Process Exit Codes section in systemd.exec(5). If no additional arguments are specified, all known statuses are shown. Otherwise, only the definitions for the specified codes are shown. Example 9. Show some example exit status names$ systemd-analyze exit-status 0 1 {63..65} NAME STATUS CLASS SUCCESS 0 glibc FAILURE 1 glibc - 63 - USAGE 64 BSD DATAERR 65 BSD
systemd-analyze capability [ CAPABILITY...]
This command prints a list of Linux capabilities along with their numeric IDs. See capabilities(7) for details. If no argument is specified the full list of capabilities known to the service manager and the kernel is shown. Capabilities defined by the kernel but not known to the service manager are shown as "cap_???". Optionally, if arguments are specified they may refer to specific cabilities by name or numeric ID, in which case only the indicated capabilities are shown in the table. Example 10. Show some example capability names$ systemd-analyze capability 0 1 {30..32} NAME NUMBER cap_chown 0 cap_dac_override 1 cap_audit_control 30 cap_setfcap 31 cap_mac_override 32
systemd-analyze condition CONDITION...
This command will evaluate Condition*=... and Assert*=... assignments, and print their values, and the resulting value of the combined condition set. See systemd.unit(5) for a list of available conditions and asserts. Example 11. Evaluate conditions that check kernel versions$ systemd-analyze condition 'ConditionKernelVersion = ! <4.0' \ 'ConditionKernelVersion = >=5.1' \ 'ConditionACPower=|false' \ 'ConditionArchitecture=|!arm' \ 'AssertPathExists=/etc/os-release' test.service: AssertPathExists=/etc/os-release succeeded. Asserts succeeded. test.service: ConditionArchitecture=|!arm succeeded. test.service: ConditionACPower=|false failed. test.service: ConditionKernelVersion=>=5.1 succeeded. test.service: ConditionKernelVersion=!<4.0 succeeded. Conditions succeeded.
systemd-analyze syscall-filter [ SET...]
This command will list system calls contained in the specified system call set SET, or all known sets if no sets are specified. Argument SET must include the "@" prefix.systemd-analyze filesystems [ SET...]
This command will list filesystems in the specified filesystem set SET, or all known sets if no sets are specified. Argument SET must include the "@" prefix.systemd-analyze calendar EXPRESSION...
This command will parse and normalize repetitive calendar time events, and will calculate when they elapse next. This takes the same input as the OnCalendar= setting in systemd.timer(5), following the syntax described in systemd.time(7). By default, only the next time the calendar expression will elapse is shown; use --iterations= to show the specified number of next times the expression elapses. Each time the expression elapses forms a timestamp, see the timestamp verb below. Example 12. Show leap days in the near future$ systemd-analyze calendar --iterations=5 '*-2-29 0:0:0' Original form: *-2-29 0:0:0 Normalized form: *-02-29 00:00:00 Next elapse: Sat 2020-02-29 00:00:00 UTC From now: 11 months 15 days left Iter. #2: Thu 2024-02-29 00:00:00 UTC From now: 4 years 11 months left Iter. #3: Tue 2028-02-29 00:00:00 UTC From now: 8 years 11 months left Iter. #4: Sun 2032-02-29 00:00:00 UTC From now: 12 years 11 months left Iter. #5: Fri 2036-02-29 00:00:00 UTC From now: 16 years 11 months left
systemd-analyze timestamp TIMESTAMP...
This command parses a timestamp (i.e. a single point in time) and outputs the normalized form and the difference between this timestamp and now. The timestamp should adhere to the syntax documented in systemd.time(7), section "PARSING TIMESTAMPS". Example 13. Show parsing of timestamps$ systemd-analyze timestamp yesterday now tomorrow Original form: yesterday Normalized form: Mon 2019-05-20 00:00:00 CEST (in UTC): Sun 2019-05-19 22:00:00 UTC UNIX seconds: @15583032000 From now: 1 day 9h ago Original form: now Normalized form: Tue 2019-05-21 09:48:39 CEST (in UTC): Tue 2019-05-21 07:48:39 UTC UNIX seconds: @1558424919.659757 From now: 43us ago Original form: tomorrow Normalized form: Wed 2019-05-22 00:00:00 CEST (in UTC): Tue 2019-05-21 22:00:00 UTC UNIX seconds: @15584760000 From now: 14h left
systemd-analyze timespan EXPRESSION...
This command parses a time span (i.e. a difference between two timestamps) and outputs the normalized form and the equivalent value in microseconds. The time span should adhere to the syntax documented in systemd.time(7), section "PARSING TIME SPANS". Values without units are parsed as seconds. Example 14. Show parsing of timespans$ systemd-analyze timespan 1s 300s '1year 0.000001s' Original: 1s μs: 1000000 Human: 1s Original: 300s μs: 300000000 Human: 5min Original: 1year 0.000001s μs: 31557600000001 Human: 1y 1us
systemd-analyze cat-config NAME|PATH...
This command is similar to systemctl cat, but operates on config files. It will copy the contents of a config file and any drop-ins to standard output, using the usual systemd set of directories and rules for precedence. Each argument must be either an absolute path including the prefix (such as /etc/systemd/logind.conf or /usr/lib/systemd/logind.conf), or a name relative to the prefix (such as systemd/logind.conf). Example 15. Showing logind configuration$ systemd-analyze cat-config systemd/logind.conf # /etc/systemd/logind.conf ... [Login] NAutoVTs=8 ... # /usr/lib/systemd/logind.conf.d/20-test.conf ... some override from another package # /etc/systemd/logind.conf.d/50-override.conf ... some administrator override
systemd-analyze compare-versions VERSION1 [OP] VERSION2
This command has two distinct modes of operation, depending on whether the operator OP is specified. In the first mode — when OP is not specified — it will compare the two version strings and print either " VERSION1 < VERSION2", or " VERSION1 == VERSION2", or " VERSION1 > VERSION2" as appropriate. The exit status is 0 if the versions are equal, 11 if the version of the right is smaller, and 12 if the version of the left is smaller. (This matches the convention used by rpmdev-vercmp.) In the second mode — when OP is specified — it will compare the two version strings using the operation OP and return 0 (success) if they condition is satisfied, and 1 (failure) otherwise. OP may be lt, le, eq, ne, ge, gt. In this mode, no output is printed. (This matches the convention used by dpkg(1) --compare-versions.) Example 16. Compare versions of a package$ systemd-analyze compare-versions systemd-250~rc1.fc36.aarch64 systemd-251.fc36.aarch64 systemd-250~rc1.fc36.aarch64 < systemd-251.fc36.aarch64 $ echo $? 12 $ systemd-analyze compare-versions 1 lt 2; echo $? 0 $ systemd-analyze compare-versions 1 ge 2; echo $? 1
systemd-analyze verify FILE...
This command will load unit files and print warnings if any errors are detected. Files specified on the command line will be loaded, but also any other units referenced by them. A unit's name on disk can be overridden by specifying an alias after a colon; see below for an example. The full unit search path is formed by combining the directories for all command line arguments, and the usual unit load paths. The variable $SYSTEMD_UNIT_PATH is supported, and may be used to replace or augment the compiled in set of unit load paths; see systemd.unit(5). All units files present in the directories containing the command line arguments will be used in preference to the other paths. The following errors are currently detected:•unknown sections and directives,
•missing dependencies which are
required to start the given unit,
•man pages listed in
Documentation= which are not found in the system,
•commands listed in ExecStart=
and similar which are not found in the system or not executable.
Example 17. Misspelt directives
$ cat ./user.slice [Unit] WhatIsThis=11 Documentation=man:nosuchfile(1) Requires=different.service [Service] Description=x $ systemd-analyze verify ./user.slice [./user.slice:9] Unknown lvalue 'WhatIsThis' in section 'Unit' [./user.slice:13] Unknown section 'Service'. Ignoring. Error: org.freedesktop.systemd1.LoadFailed: Unit different.service failed to load: No such file or directory. Failed to create user.slice/start: Invalid argument user.slice: man nosuchfile(1) command failed with code 16
$ tail ./a.socket ./b.socket ==> ./a.socket <== [Socket] ListenStream=100 ==> ./b.socket <== [Socket] ListenStream=100 Accept=yes $ systemd-analyze verify ./a.socket ./b.socket Service a.service not loaded, a.socket cannot be started. Service [email protected] not loaded, b.socket cannot be started.
$ cat /tmp/source [Unit] Description=Hostname printer [Service] Type=simple ExecStart=/usr/bin/echo %H MysteryKey=true $ systemd-analyze verify /tmp/source Failed to prepare filename /tmp/source: Invalid argument $ systemd-analyze verify /tmp/source:alias.service /tmp/systemd-analyze-XXXXXX/alias.service:7: Unknown key name 'MysteryKey' in section 'Service', ignoring.
systemd-analyze security [ UNIT...]
This command analyzes the security and sandboxing settings of one or more specified service units. If at least one unit name is specified the security settings of the specified service units are inspected and a detailed analysis is shown. If no unit name is specified, all currently loaded, long-running service units are inspected and a terse table with results shown. The command checks for various security-related service settings, assigning each a numeric "exposure level" value, depending on how important a setting is. It then calculates an overall exposure level for the whole unit, which is an estimation in the range 0.0...10.0 indicating how exposed a service is security-wise. High exposure levels indicate very little applied sandboxing. Low exposure levels indicate tight sandboxing and strongest security restrictions. Note that this only analyzes the per-service security features systemd itself implements. This means that any additional security mechanisms applied by the service code itself are not accounted for. The exposure level determined this way should not be misunderstood: a high exposure level neither means that there is no effective sandboxing applied by the service code itself, nor that the service is actually vulnerable to remote or local attacks. High exposure levels do indicate however that most likely the service might benefit from additional settings applied to them. Please note that many of the security and sandboxing settings individually can be circumvented — unless combined with others. For example, if a service retains the privilege to establish or undo mount points many of the sandboxing options can be undone by the service code itself. Due to that is essential that each service uses the most comprehensive and strict sandboxing and security settings possible. The tool will take into account some of these combinations and relationships between the settings, but not all. Also note that the security and sandboxing settings analyzed here only apply to the operations executed by the service code itself. If a service has access to an IPC system (such as D-Bus) it might request operations from other services that are not subject to the same restrictions. Any comprehensive security and sandboxing analysis is hence incomplete if the IPC access policy is not validated too. Example 20. Analyze systemd-logind.service$ systemd-analyze security --no-pager systemd-logind.service NAME DESCRIPTION EXPOSURE ✗ PrivateNetwork= Service has access to the host's network 0.5 ✗ User=/DynamicUser= Service runs as root user 0.4 ✗ DeviceAllow= Service has no device ACL 0.2 ✓ IPAddressDeny= Service blocks all IP address ranges ... → Overall exposure level for systemd-logind.service: 4.1 OK 🙂
systemd-analyze inspect-elf FILE...
This command will load the specified files, and if they are ELF objects (executables, libraries, core files, etc.) it will parse the embedded packaging metadata, if any, and print it in a table or json format. See the Packaging Metadata[1] documentation for more information. Example 21. Table output$ systemd-analyze inspect-elf --json=pretty /tmp/core.fsverity.1000.f77dac5dc161402aa44e15b7dd9dcf97.58561.1637106137000000 { "elfType" : "coredump", "elfArchitecture" : "AMD x86-64", "/home/bluca/git/fsverity-utils/fsverity" : { "type" : "deb", "name" : "fsverity-utils", "version" : "1.3-1", "buildId" : "7c895ecd2a271f93e96268f479fdc3c64a2ec4ee" }, "/home/bluca/git/fsverity-utils/libfsverity.so.0" : { "type" : "deb", "name" : "fsverity-utils", "version" : "1.3-1", "buildId" : "b5e428254abf14237b0ae70ed85fffbb98a78f88" } }
OPTIONS
The following options are understood: --systemOperates on the system systemd instance. This
is the implied default.
--user
Operates on the user systemd instance.
--global
Operates on the system-wide configuration for
user systemd instance.
--order, --require
When used in conjunction with the dot
command (see above), selects which dependencies are shown in the dependency
graph. If --order is passed, only dependencies of type After= or
Before= are shown. If --require is passed, only dependencies of
type Requires=, Requisite=, Wants= and Conflicts=
are shown. If neither is passed, this shows dependencies of all these
types.
--from-pattern=, --to-pattern=
When used in conjunction with the dot
command (see above), this selects which relationships are shown in the
dependency graph. Both options require a glob(7) pattern as an
argument, which will be matched against the left-hand and the right-hand,
respectively, nodes of a relationship.
Each of these can be used more than once, in which case the unit name must match
one of the values. When tests for both sides of the relation are present, a
relation must pass both tests to be shown. When patterns are also specified as
positional arguments, they must match at least one side of the relation. In
other words, patterns specified with those two options will trim the list of
edges matched by the positional arguments, if any are given, and fully
determine the list of edges shown otherwise.
--fuzz=timespan
When used in conjunction with the
critical-chain command (see above), also show units, which finished
timespan earlier, than the latest unit in the same level. The unit of
timespan is seconds unless specified with a different unit, e.g.
"50ms".
--man=no
Do not invoke man(1) to verify the
existence of man pages listed in Documentation=.
--generators
Invoke unit generators, see
systemd.generator(7). Some generators require root privileges. Under a
normal user, running with generators enabled will generally result in some
warnings.
--recursive-errors=MODE
Control verification of units and their
dependencies and whether systemd-analyze verify exits with a non-zero
process exit status or not. With yes, return a non-zero process exit
status when warnings arise during verification of either the specified unit or
any of its associated dependencies. With no, return a non-zero process
exit status when warnings arise during verification of only the specified
unit. With one, return a non-zero process exit status when warnings
arise during verification of either the specified unit or its immediate
dependencies. If this option is not specified, zero is returned as the exit
status regardless whether warnings arise during verification or not.
--root=PATH
With cat-files and verify,
operate on files underneath the specified root path PATH.
--image=PATH
With cat-files and verify,
operate on files inside the specified image path PATH.
--offline=BOOL
With security, perform an offline
security review of the specified unit files, i.e. does not have to rely on PID
1 to acquire security information for the files like the security verb
when used by itself does. This means that --offline= can be used with
--root= and --image= as well. If a unit's overall exposure level
is above that set by --threshold= (default value is 100),
--offline= will return an error.
--profile=PATH
With security --offline=, takes
into consideration the specified portable profile when assessing unit
settings. The profile can be passed by name, in which case the well-known
system locations will be searched, or it can be the full path to a specific
drop-in file.
--threshold=NUMBER
With security, allow the user to set a
custom value to compare the overall exposure level with, for the specified
unit files. If a unit's overall exposure level, is greater than that set by
the user, security will return an error. --threshold= can be
used with --offline= as well and its default value is 100.
--security-policy=PATH
With security, allow the user to define
a custom set of requirements formatted as a JSON file against which to compare
the specified unit file(s) and determine their overall exposure level to
security threats.
Table 1. Accepted Assessment Test Identifiers
See example "JSON Policy" below.
--json=MODE
Assessment Test Identifier |
UserOrDynamicUser |
SupplementaryGroups |
PrivateMounts |
PrivateDevices |
PrivateTmp |
PrivateNetwork |
PrivateUsers |
ProtectControlGroups |
ProtectKernelModules |
ProtectKernelTunables |
ProtectKernelLogs |
ProtectClock |
ProtectHome |
ProtectHostname |
ProtectSystem |
RootDirectoryOrRootImage |
LockPersonality |
MemoryDenyWriteExecute |
NoNewPrivileges |
CapabilityBoundingSet_CAP_SYS_ADMIN |
CapabilityBoundingSet_CAP_SET_UID_GID_PCAP |
CapabilityBoundingSet_CAP_SYS_PTRACE |
CapabilityBoundingSet_CAP_SYS_TIME |
CapabilityBoundingSet_CAP_NET_ADMIN |
CapabilityBoundingSet_CAP_SYS_RAWIO |
CapabilityBoundingSet_CAP_SYS_MODULE |
CapabilityBoundingSet_CAP_AUDIT |
CapabilityBoundingSet_CAP_SYSLOG |
CapabilityBoundingSet_CAP_SYS_NICE_RESOURCE |
CapabilityBoundingSet_CAP_MKNOD |
CapabilityBoundingSet_CAP_CHOWN_FSETID_SETFCAP |
CapabilityBoundingSet_CAP_DAC_FOWNER_IPC_OWNER |
CapabilityBoundingSet_CAP_KILL |
CapabilityBoundingSet_CAP_NET_BIND_SERVICE_BROADCAST_RAW |
CapabilityBoundingSet_CAP_SYS_BOOT |
CapabilityBoundingSet_CAP_MAC |
CapabilityBoundingSet_CAP_LINUX_IMMUTABLE |
CapabilityBoundingSet_CAP_IPC_LOCK |
CapabilityBoundingSet_CAP_SYS_CHROOT |
CapabilityBoundingSet_CAP_BLOCK_SUSPEND |
CapabilityBoundingSet_CAP_WAKE_ALARM |
CapabilityBoundingSet_CAP_LEASE |
CapabilityBoundingSet_CAP_SYS_TTY_CONFIG |
CapabilityBoundingSet_CAP_BPF |
UMask |
KeyringMode |
ProtectProc |
ProcSubset |
NotifyAccess |
RemoveIPC |
Delegate |
RestrictRealtime |
RestrictSUIDSGID |
RestrictNamespaces_user |
RestrictNamespaces_mnt |
RestrictNamespaces_ipc |
RestrictNamespaces_pid |
RestrictNamespaces_cgroup |
RestrictNamespaces_uts |
RestrictNamespaces_net |
RestrictAddressFamilies_AF_INET_INET6 |
RestrictAddressFamilies_AF_UNIX |
RestrictAddressFamilies_AF_NETLINK |
RestrictAddressFamilies_AF_PACKET |
RestrictAddressFamilies_OTHER |
SystemCallArchitectures |
SystemCallFilter_swap |
SystemCallFilter_obsolete |
SystemCallFilter_clock |
SystemCallFilter_cpu_emulation |
SystemCallFilter_debug |
SystemCallFilter_mount |
SystemCallFilter_module |
SystemCallFilter_raw_io |
SystemCallFilter_reboot |
SystemCallFilter_privileged |
SystemCallFilter_resources |
IPAddressDeny |
DeviceAllow |
AmbientCapabilities |
With the security command, generate a
JSON formatted output of the security analysis table. The format is a JSON
array with objects containing the following fields: set which indicates
if the setting has been enabled or not, name which is what is used to
refer to the setting, json_field which is the JSON compatible
identifier of the setting, description which is an outline of the
setting state, and exposure which is a number in the range 0.0...10.0,
where a higher value corresponds to a higher security threat. The JSON version
of the table is printed to standard output. The MODE passed to the
option can be one of three: off which is the default, pretty and
short which respectively output a prettified or shorted JSON version of
the security table.
--iterations=NUMBER
When used with the calendar command,
show the specified number of iterations the specified calendar expression will
elapse next. Defaults to 1.
--base-time=TIMESTAMP
When used with the calendar command,
show next iterations relative to the specified point in time. If not specified
defaults to the current time.
--unit=UNIT
When used with the condition command,
evaluate all the Condition*=... and Assert*=... assignments in
the specified unit file. The full unit search path is formed by combining the
directories for the specified unit with the usual unit load paths. The
variable $SYSTEMD_UNIT_PATH is supported, and may be used to replace or
augment the compiled in set of unit load paths; see systemd.unit(5).
All units files present in the directory containing the specified unit will be
used in preference to the other paths.
-H, --host=
Execute the operation remotely. Specify a
hostname, or a username and hostname separated by "@", to connect
to. The hostname may optionally be suffixed by a port ssh is listening on,
separated by ":", and then a container name, separated by
"/", which connects directly to a specific container on the
specified host. This will use SSH to talk to the remote machine manager
instance. Container names may be enumerated with machinectl -H
HOST. Put IPv6 addresses in brackets.
-M, --machine=
Execute operation on a local container.
Specify a container name to connect to, optionally prefixed by a user name to
connect as and a separating "@" character. If the special string
".host" is used in place of the container name, a connection to the
local system is made (which is useful to connect to a specific user's user
bus: "--user --machine=[email protected]"). If the "@" syntax
is not used, the connection is made as root user. If the "@" syntax
is used either the left hand side or the right hand side may be omitted (but
not both) in which case the local user name and ".host" are
implied.
-q, --quiet
Suppress hints and other non-essential
output.
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
--no-pager
Do not pipe output into a pager.
EXIT STATUS
For most commands, 0 is returned on success, and a non-zero failure code otherwise. With the verb compare-versions, in the two-argument form, 12, 0, 11 is returned if the second version string is respectively larger, equal, or smaller to the first. In the three-argument form, 0 or 1 if the condition is respectively true or false.ENVIRONMENT
$SYSTEMD_LOG_LEVELThe maximum log level of emitted messages
(messages with a higher log level, i.e. less important ones, will be
suppressed). Either one of (in order of decreasing importance) emerg,
alert, crit, err, warning, notice,
info, debug, or an integer in the range 0...7. See
syslog(3) for more information.
$SYSTEMD_LOG_COLOR
A boolean. If true, messages written to the
tty will be colored according to priority.
This setting is only useful when messages are written directly to the terminal,
because journalctl(1) and other tools that display logs will color
messages based on the log level on their own.
$SYSTEMD_LOG_TIME
A boolean. If true, console log messages will
be prefixed with a timestamp.
This setting is only useful when messages are written directly to the terminal
or a file, because journalctl(1) and other tools that display logs will
attach timestamps based on the entry metadata on their own.
$SYSTEMD_LOG_LOCATION
A boolean. If true, messages will be prefixed
with a filename and line number in the source code where the message
originates.
Note that the log location is often attached as metadata to journal entries
anyway. Including it directly in the message text can nevertheless be
convenient when debugging programs.
$SYSTEMD_LOG_TID
A boolean. If true, messages will be prefixed
with the current numerical thread ID (TID).
Note that the this information is attached as metadata to journal entries
anyway. Including it directly in the message text can nevertheless be
convenient when debugging programs.
$SYSTEMD_LOG_TARGET
The destination for log messages. One of
console (log to the attached tty), console-prefixed (log to the
attached tty but with prefixes encoding the log level and
"facility", see syslog(3), kmsg (log to the kernel
circular log buffer), journal (log to the journal),
journal-or-kmsg (log to the journal if available, and to kmsg
otherwise), auto (determine the appropriate log target automatically,
the default), null (disable log output).
$SYSTEMD_PAGER
Pager to use when --no-pager is not
given; overrides $PAGER. If neither $SYSTEMD_PAGER nor
$PAGER are set, a set of well-known pager implementations are tried in
turn, including less(1) and more(1), until one is found. If no
pager implementation is discovered no pager is invoked. Setting this
environment variable to an empty string or the value "cat" is
equivalent to passing --no-pager.
Note: if $SYSTEMD_PAGERSECURE is not set, $SYSTEMD_PAGER (as well
as $PAGER) will be silently ignored.
$SYSTEMD_LESS
Override the options passed to less (by
default "FRSXMK").
Users might want to change two options in particular:
K
Note that setting the regular $LESS environment variable has no effect
for less invocations by systemd tools.
See less(1) for more discussion.
$SYSTEMD_LESSCHARSET
This option instructs the pager to exit
immediately when Ctrl+C is pressed. To allow less to handle Ctrl+C
itself to switch back to the pager command prompt, unset this option.
If the value of $SYSTEMD_LESS does not include "K", and the
pager that is invoked is less, Ctrl+C will be ignored by the
executable, and needs to be handled by the pager.
X
This option instructs the pager to not send
termcap initialization and deinitialization strings to the terminal. It is set
by default to allow command output to remain visible in the terminal even
after the pager exits. Nevertheless, this prevents some pager functionality
from working, in particular paged output cannot be scrolled with the
mouse.
Override the charset passed to less (by
default "utf-8", if the invoking terminal is determined to be UTF-8
compatible).
Note that setting the regular $LESSCHARSET environment variable has no
effect for less invocations by systemd tools.
$SYSTEMD_PAGERSECURE
Takes a boolean argument. When true, the
"secure" mode of the pager is enabled; if false, disabled. If
$SYSTEMD_PAGERSECURE is not set at all, secure mode is enabled if the
effective UID is not the same as the owner of the login session, see
geteuid(2) and sd_pid_get_owner_uid(3). In secure mode,
LESSSECURE=1 will be set when invoking the pager, and the pager shall
disable commands that open or create new files or start new subprocesses. When
$SYSTEMD_PAGERSECURE is not set at all, pagers which are not known to
implement secure mode will not be used. (Currently only less(1)
implements secure mode.)
Note: when commands are invoked with elevated privileges, for example under
sudo(8) or pkexec(1), care must be taken to ensure that
unintended interactive features are not enabled. "Secure" mode for
the pager may be enabled automatically as describe above. Setting
SYSTEMD_PAGERSECURE=0 or not removing it from the inherited environment
allows the user to invoke arbitrary commands. Note that if the
$SYSTEMD_PAGER or $PAGER variables are to be honoured,
$SYSTEMD_PAGERSECURE must be set too. It might be reasonable to
completely disable the pager using --no-pager instead.
$SYSTEMD_COLORS
Takes a boolean argument. When true,
systemd and related utilities will use colors in their output,
otherwise the output will be monochrome. Additionally, the variable can take
one of the following special values: "16", "256" to
restrict the use of colors to the base 16 or 256 ANSI colors, respectively.
This can be specified to override the automatic decision based on $TERM
and what the console is connected to.
$SYSTEMD_URLIFY
The value must be a boolean. Controls whether
clickable links should be generated in the output for terminal emulators
supporting this. This can be specified to override the decision that
systemd makes based on $TERM and other conditions.
EXAMPLES
Example 22. JSON Policy The JSON file passed as a path parameter to --security-policy= has a top-level JSON object, with keys being the assessment test identifiers mentioned above. The values in the file should be JSON objects with one or more of the following fields: description_na (string), description_good (string), description_bad (string), weight (unsigned integer), and range (unsigned integer). If any of these fields corresponding to a specific id of the unit file is missing from the JSON object, the default built-in field value corresponding to that same id is used for security analysis as default. The weight and range fields are used in determining the overall exposure level of the unit files: the value of each setting is assigned a badness score, which is multiplied by the policy weight and divided by the policy range to determine the overall exposure that the setting implies. The computed badness is summed across all settings in the unit file, normalized to the 1...100 range, and used to determine the overall exposure level of the unit. By allowing users to manipulate these fields, the 'security' verb gives them the option to decide for themself which ids are more important and hence should have a greater effect on the exposure level. A weight of "0" means the setting will not be checked.{ "PrivateDevices": { "description_good": "Service has no access to hardware devices", "description_bad": "Service potentially has access to hardware devices", "weight": 1000, "range": 1 }, "PrivateMounts": { "description_good": "Service cannot install system mounts", "description_bad": "Service may install system mounts", "weight": 1000, "range": 1 }, "PrivateNetwork": { "description_good": "Service has no access to the host's network", "description_bad": "Service has access to the host's network", "weight": 2500, "range": 1 }, "PrivateTmp": { "description_good": "Service has no access to other software's temporary files", "description_bad": "Service has access to other software's temporary files", "weight": 1000, "range": 1 }, "PrivateUsers": { "description_good": "Service does not have access to other users", "description_bad": "Service has access to other users", "weight": 1000, "range": 1 } }
SEE ALSO
systemd(1), systemctl(1)NOTES
- 1.
- Packaging Metadata
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