Ósme_21
0 21 Fiche michalesq
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What manages services in RHEL 7?
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systemd
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Can systemd start multiple services in the same time?
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yes
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List available targets in the system
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systemctl list-units --type=target
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List available unit types
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systemctl -t help
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Unique configuration files are located in?
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/etc/systemd/system
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Display current target
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systemctl get-default
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What are the targets in RHEL?
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multi-user. target, graphical. target, emergency. target, rescue. target
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Display dependencies for multi-user. targer
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systemctl list-dependencies multi-user. target
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How to change target to different target?
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systemctl isolate multi-user. target
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How to set default target?
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systemctl set-default
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Where are all unit configuration files?
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/usr/lib/system
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Where are all unit configuration files for downloaded and installed programs?
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/etc/systemd/system
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How to boot a system into different target?
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Interrupt booting with e, go to linux16, add systemd. unit=emergency. target at the end, ctrl+x
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How to list all jobs working in the background?
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root#jobs
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How to stop program with id 1
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kill -SIGSTOP %1
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How to resume previously stopped program?
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kill -sigcont %1
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What is the most prioritized level?
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-20
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What is the least priorizted level?
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19
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How to create 1G file with dd command?
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dd if=/dev/zero/ of=/root/test. file bs=1M count=1024
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How to check runing services and their nice level?
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ps axo pid, comm, nice | grep <nazwa serwisu>
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How to start httpd service with priority 0, previously must be stopped
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nice -n 0 httpd
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