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RHCSA Exam Practice Questions with 100% Correct Answers |Verified Latest Update
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RHCSA Exam Practice Questions with 100% Correct Answers |Verified Latest Update
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RHCSA Exam Practice Questions with 100%Correct Answers |Verified Latest Update
To add an additional connection profile called 'default', which uses DHCP and connect
automatically using your first onboard ethernet device, you would run: - ✔✔nmcli con add
con-name 'default' type ethernet ifname eno1
nmcli con add' adds a connection; to do so requires that you specific AT LEAST the new
connection profile name ('con-name'), type ('type') and which network interface it's attached to
('ifname').
make journalctl persistent across reboots - ✔✔make a directory to store the logs
mkdir /var/
chmod 2775 /var/log/journal
# change the group owner to systemd-journal
chgrp systemd-journal /var/log/journal
# releoad journalctl
killall -USR1 systemd-journald
# send all logs to the new dir since X reboot
journalctl -b-X
It's the last day of November, and you've been asked for a list of users who've connected to
your server via ssh in the last month. How could you gather this information? - ✔✔journalctl
-u sshd.service --since -30d
OR
last
,OR
grep 'sshd' /var/log/secure* | grep 'opened'
How are the log files created by 'rsyslog' prevented from growing until they use up all your
storage? - ✔✔They are rotated by 'logrotate', which is scheduled to run as a daily cron job.
The 'cronie' scheduler runs logrotate daily, as per '/etc/cron.daily/logrotate'. For most logs
logrotate performs weekly rotation and keeps 4 weeks of backlogs. This can be configured in
/etc/logrotate.conf
Imagine you're logging into a customer's server to resolve an issue they've logged via your
ticketing system. How would you ensure your name and the ticket number appear alongside
the log entry showing your connection -- so they know who and why the connection was made
-- should they ever perform an audit? - ✔✔logger -p authpriv.info 'Acloud Guru: Tkt #10869'
NEVER write directly to the log files. At best, your entry will be overwritten; at worst, the file
could become corrupted. Always use 'logger'. Incoming 'ssh' connections are logged under the
'authpriv' facility; therefore, to ensure your entry appears beneath the entry for your
connection, you must log to that facility with '-p authpriv.info'. Otherwise, the entry will go into
'/var/log/messages'.
How is the systemd journal prevented from filling up your storage? - ✔✔systemd-journald
handles rotation internally and can be configured using 'journalctl'.
Although it is true that by default systemd-journald only retains logs for the current boot
instance, Linux boxes can run for years between reboots, so a substantial volume of log entries
could accumulate. To view rotation settings and limits, run 'journalctl | head'.
tool used to view/manage time-related config - ✔✔timedatectl
, useful subcommands:
list-timezones # for a list of available time zones
set-timezone # to set systemc time zone
set-time # to set system time
set-ntp # to control time sync via NTP
tool used to view/set on board hardware clock - ✔✔hwclock
default NTP service - ✔✔chronyd
/etc/chrony.conf is the config file
can serve time to the network
functions as a client to sync system time
tool used to configure the NTP service on modern systems - ✔✔chronyc # used to
query/control chronyd
useful subcommand
sources # to view sources and sync status
recurring task scheduler - ✔✔cronie
master file for the task scheduler - ✔✔/etc/crontab # rarely edited but contains useful
guidelines
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