Tips & Tricks on RedHat Enterprise Linux (RHEL)

Here’s a few tips & tricks on RedHat Enterprise Linux (RHEL)

 

add/remove SNMP settings

edit the “/etc/snmp/snmpd.conf”

service snmpd reload

edit the “/etc/hosts.allow” as needed

 

List process & find what process is doing

ps aux

strace

 

Display cluster configuration

rpm -qa | grep -i cluster

clustat

pcs status

 

Get system information

on DellPowerEdge:

   racadm getsysinfo

   racadm lclog view

 

on RHEL hardware detects:

   dmesg

 

Reset login attempts for users

pam_tally2 -r (reset) -u (user) userName

 

Reset password expiration date

chage -I -1 -m 0 -M 99999 -E -1 userName