[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"me":3,"catalog:en:devops-cloud\u002Flinux-systemd-service-management":4,"config":256},null,{"field_key":5,"field_name":6,"seniority":7,"topic_key":8,"topic_name":9,"spec_key":7,"spec_name":7,"locale":10,"cell_total":11,"field_total":12,"seniorities":13,"topics":17,"specs":151,"samples":171},"devops-cloud","DevOps \u002F Cloud","","linux-systemd-service-management","Linux Systemd Service Management","en",75,3375,[14,15,16],"junior","mid","senior",[18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99,102,105,108,111,114,117,120,121,124,127,130,133,136,139,142,145,148],{"key":19,"name":20,"count":11},"aws-compute-ec2-lambda","Aws Compute Ec2 Lambda",{"key":22,"name":23,"count":11},"aws-databases-rds-dynamodb","Aws Databases Rds Dynamodb",{"key":25,"name":26,"count":11},"aws-iam-security","Aws Iam Security",{"key":28,"name":29,"count":11},"aws-messaging-eventing","Aws Messaging 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Cicd",[152,156,159,162,165,168],{"key":153,"name":154,"count":155},"aws","AWS",450,{"key":157,"name":158,"count":155},"azure","Azure",{"key":160,"name":161,"count":155},"gcp","GCP",{"key":163,"name":164,"count":155},"kubernetes","Kubernetes",{"key":166,"name":167,"count":155},"linux","Linux",{"key":169,"name":170,"count":155},"terraform","Terraform",[172,190,203,216,229,243],{"id":173,"topic":9,"difficulty":174,"body":175,"options":176,"correct_key":178,"explanation":189},"019f913c-2317-7288-97d8-0c791e447579",1,"A systemd unit file for a service is typically split into which three sections, and what does each one primarily hold?",[177,180,183,186],{"key":178,"text":179},"a","[Unit], [Service], [Install] — general metadata\u002Fdependencies, service-specific execution settings, and installation (enablement) info, respectively",{"key":181,"text":182},"b","[Meta], [Process], [Boot] — metadata, runtime process settings, and boot ordering, respectively, a naming scheme some engineers assume by analogy with Windows Service Manager property categories",{"key":184,"text":185},"c","[Config], [Run], [Start] — configuration values, the run command, and a separate start trigger similar to a Makefile target, respectively, though no such section names exist in the systemd unit grammar",{"key":187,"text":188},"d","[Header], [Body], [Footer] — a naming convention borrowed from HTTP, purely cosmetic and silently ignored by systemd's unit file parser at load time","A typical .service unit has [Unit] (general metadata and relationships to other units, e.g. Description=, After=), [Service] (how the process itself is run, e.g. ExecStart=, Restart=), and [Install] (how enabling the unit hooks it into a target, e.g. WantedBy=). The other section names do not exist in systemd.",{"id":191,"topic":9,"difficulty":174,"body":192,"options":193,"correct_key":181,"explanation":202},"019f913c-2317-7c2a-96e6-1c2b73a6217a","In a .service unit file, what kind of directives typically belong in the [Unit] section?",[194,196,198,200],{"key":178,"text":195},"The exact command line used to start the service process (ExecStart=), since [Unit] is sometimes incorrectly assumed to hold the primary execution directive instead of [Service]",{"key":181,"text":197},"General metadata and unit relationships — such as Description=, After=, Requires= — that apply regardless of the unit's type",{"key":184,"text":199},"Only the WantedBy= directive that controls which target enables the unit, conflating [Unit]'s ordering hints with the enablement wiring that actually lives in [Install]",{"key":187,"text":201},"Restart policy directives such as Restart=on-failure, under the mistaken assumption that failure-handling belongs with general unit metadata rather than the service-specific execution block","[Unit] holds generic, type-independent metadata and ordering\u002Fdependency directives (Description=, After=, Requires=, Wants=). ExecStart= and Restart= belong in [Service]; WantedBy= belongs in [Install].",{"id":204,"topic":9,"difficulty":174,"body":205,"options":206,"correct_key":184,"explanation":215},"019f913c-2318-73d4-aace-f7c5295bd7ca","Which directive would you expect to find in the [Service] section of a systemd unit rather than in [Unit] or [Install]?",[207,209,211,213],{"key":178,"text":208},"Description=, a human-readable one-line summary of the unit that also shows up in `systemctl status` output and journal entries",{"key":181,"text":210},"After=, an ordering hint relative to other units that many engineers assume also implies a hard dependency like Requires=",{"key":184,"text":212},"ExecStart=, defining the command that is run when the service starts",{"key":187,"text":214},"WantedBy=, the target that pulls this unit in when enabled, a directive that is often mistakenly expected inside [Service] itself","ExecStart= is a [Service]-section directive: it defines the actual command systemd runs for this specific service. Description= and After= are generic [Unit] directives; WantedBy= is an [Install] directive.",{"id":217,"topic":9,"difficulty":174,"body":218,"options":219,"correct_key":187,"explanation":228},"019f913c-2318-7aa9-80e6-dd1f92d380e1","What is the purpose of the [Install] section in a unit file?",[220,222,224,226],{"key":178,"text":221},"It defines the process that is actually executed by the service, since [Install] is sometimes mistakenly treated as an alternate place to declare ExecStart= alongside [Service]",{"key":181,"text":223},"It only holds documentation strings meant for humans reading the file, similar to a code comment block that systemd itself never parses or acts on at runtime",{"key":184,"text":225},"It sets resource limits like CPU and memory quotas for the service, a responsibility that actually belongs to cgroup-related directives such as CPUQuota= inside [Service]",{"key":187,"text":227},"It defines how the unit is hooked into targets (e.g. WantedBy=) so that `systemctl enable` knows which symlink to create for boot-time activation","[Install] is only consulted by `systemctl enable`\u002F`disable`: it tells systemd which target's .wants\u002F directory should get a symlink to this unit. It has no effect on how the service actually runs.",{"id":230,"topic":9,"difficulty":231,"body":232,"options":233,"correct_key":178,"explanation":242},"019f913c-2319-726b-a814-a9bbc27a7585",2,"A junior engineer runs `systemctl start myapp` and the service comes up correctly. After the next reboot, though, it is not running. What is the most likely explanation?",[234,236,238,240],{"key":178,"text":235},"`systemctl start` starts a service immediately for the current session but does not create the boot-time symlink that `systemctl enable` creates",{"key":181,"text":237},"The unit file must have been deleted automatically after the first start, which does not match how systemd persists unit files on disk independently of runtime state",{"key":184,"text":239},"`systemctl start` only works when the machine is already fully booted, so it can never take effect after any future reboot — conflating the transient runtime state `start` manages with the persistent boot-time symlinks that only `enable` creates",{"key":187,"text":241},"Services always require a `systemctl daemon-reload` after every reboot, and that step was skipped, even though `daemon-reload` only re-parses changed unit definitions and has nothing to do with automatic startup on boot","`start` and `enable` are independent actions: `start` affects only the current runtime state, while `enable` is what makes systemd bring the unit up automatically on future boots by creating a symlink under the relevant target's .wants\u002F directory.",{"id":244,"topic":9,"difficulty":174,"body":245,"options":246,"correct_key":181,"explanation":255},"019f913c-2319-7e00-89d1-cd13440f020a","What information does `systemctl status myapp.service` typically show at a glance?",[247,249,251,253],{"key":178,"text":248},"Only whether the associated network port is open, treating `systemctl status` as equivalent to a port-scanning tool like `ss` rather than a unit-state summary",{"key":181,"text":250},"Whether the unit is active\u002Finactive\u002Ffailed, since when, the main PID, and a short tail of recent log lines",{"key":184,"text":252},"Only the contents of the unit file, without any runtime state, as if it behaved like a plain `cat` of the file stored on disk",{"key":187,"text":254},"Only the last exit code, without any timestamp information, ignoring the active-state and main PID fields the command actually prints","`systemctl status` gives a compact runtime summary: current active state, how long it has been in that state, the main process PID (if running), and the most recent journal lines for that unit — useful as a first triage 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