RHCSA Questions with Correct Answers
How are the log files created by 'rsyslog' prevented from growing until they use up all your storage? - Answer-They are rotated by 'logrotate', which is scheduled to run as a daily cron job.
The 'cronie' scheduler runs logrotate daily, as per '/etc/
Imag...
How are the log files created by 'rsyslog' prevented from growing until they use up all
your storage? - Answer-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? - Answer-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? - Answer-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 - Answer-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 - Answer-hwclock
default NTP service - Answer-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 - Answer-chronyc # used to
query/control chronyd
useful subcommand
sources # to view sources and sync status
recurring task scheduler - Answer-cronie
master file for the task scheduler - Answer-/etc/crontab # rarely edited but contains
useful guidelines
location for custom scheduled task(s) configuration - Answer-/etc/contab.d/*
/etc/cron.{hourly,daily,weekly,monthly} folders # executable scripts can be placed here
tool for users to manage their own scheduled tasks - Answer-crontab
To configure your server to maintain clock accuracy by synchronising with the NTP
server serv.acloud.guru, what steps would you need to perform? - Answer-Add the line
'server serv.acloud.guru iburst' to /etc/chronyd.conf then run 'timedatectl set-ntp on'.
standard file system hierarchy - Answer-/
bin # contains binaries
boot # bootloader config and kernel
dev # device nodes - virtual files that point to physical pieces of hardware
etc # system-level configs
home # user home directories - contains user specific configurations
root # root's home directories
run # dynamic run time data (dynamic/typically ephemeral)
sbin # system/superuser binaries
tmp # world writable scratch space
usr # majority of the OS, programs libraries, docs
var # persistent high throughput data
manpage for file system hierarchy - Answer-man hier
command to tar and compress a file and a directory using gizp - Answer-tar -cvzf
nameoftar.tar.gz /targetdir targetfile
c = create a new tar file
v = verbose
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