system.md

$> systemctl status name
$> service name status

unit def in /lib/systemd/system

target unit at start : /etc/systemd/system

$> pkg-config systemd --variable=systemdsystemconfdir
$> systemctl get-default
$> systemctl list-units --type target
$> systemctl list-units --type target --all
$> systemctl list-units --type service --all --no-pager

chkconfig service_name on | systemctl enable service_name

$> systemctl stop service
$> systemctl disable service
$> systemctl mask service

$> systemctl list-dependencies --after service_name

$> systemctl halt

systemadm : gui package systemd-ui

$> systctl -e -p /etc/sysctl.conf
$> systctl -a
$> echo "1" > /proc/sys/net/ipv4/ip_forward

$> dmesg -T
$> dmesg -k -lwarn,err

logs /var/log/messages or /var/log/syslog /etc/syslog.conf

$> syslog
$> syslogd

$> journalctl
$> journalctl -k -p warning..emerg
$> journalctl _SYSTEMD_UNIT=ssh.service -o json-pretty
$> journalctl -f
$> journalctl -e -u jenkins-slave.service
$> journalctl -b -1 # like dmesg for old kernel logs
$> journalctl --list-boots

/etc/systemd/journald.conf /run/log/journal

klogd syslog-ng rsyslog

logger

noyau

$> uname
$> /lib/modules/$(uname -r)

modules du noyau

lsmod : modules du noyau charges insmod : charge module sans dep modprobe : charge avec dep

$> depmod -a
$> modinfo
$> rmmod

/dev : peripheriques

$> mknod

$> lspci
$> lspci -v -s
$> lsusb

/proc : ressources materielles

$> hwinfo
$> hwinfo --memory
$> hwinfo --cpu
$> dmidecode
$> dmidecode -t processor
$> dmidecode -s processor-frequency

date --date "1 jan 1970 +11234days"

lastlog last

/etc/issue /etc/issue.net /etc/motd

/etc/pam.d

cups localhost:631 /etc/cups/cupsd.conf

nmcli : NetworkManager