REDHAT HA | PACEMAKER HA

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REDIS Enterprise HA | REDIS HIGH AVAILABILITY

REDIS Enterprise HA Installation & Configuration | REDIS HIGH AVAILABILITY

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How to Setup ADISCON LogAnalyzer with Rsyslog On CentOS 7 / RHEL 7 | CENTRALIZED LOG SERVER

Please note, copy/paste from this article to your machine may change the semi minus sign ( – ) or double quotation ( ” ). So you need to copy first at notepad and paste at your machine or make sure that special characters are accurately copied otherwise you may face hurdles while troubleshooting. For more […]

EMAIL ALERT ON DISK UTILIZATION | MONITOR ALL PARTITIONS

ENVIRONMENT OS = RHEL 8 HOSTNAME = rsyslogserver SCRIPT SAMPLE 1 [SPACE UTILIZATION] #!/bin/bash #THE CURRENT VARIABLE SORT HIGHER VALUE IF ATLEAST ONE FIND ABOVE THRESHOLD THEN ALERT GENERATED CURRENT=$(df -h |grep -vE ‘^Filesystem|tmpfs|cdrom’ |awk ‘{print $5}’ |sed ‘s/%//g’|sort -nr| sed -n ‘1p’) THRESHOLD=75 if [ “$CURRENT” -ge $THRESHOLD ] then echo echo ” ” […]

Email alert on disk space overflow for specific partition

ENVIRONMENT OS = Redhat Linux 8.0 Rsyslog Server = rsyslog-8.37.0-9.el8.x86_64 Email Client = mutt-1.10.1-2.el8.x86_64 AGENDA We need to trigger email alert in case of disk space usage cross a certain storage limit. The said exercise is done on /var disk partition for a centralized rsyslog server . In said activity we configured mutt email client […]

Reset root password when unable to login in run level 3,5 plus single user mode

LAB ENVIRONMENT RHEL = 7.6 Reset root password when unable to login in run level 3,5 plus also in Single user mode. You need to boot from redhat OS dvd and move towards > troubleshooting > rescue mode > readonly. Second you need to run the following commands to mount the partition chroot /mnt/sysimage with […]

ACCOUNT LOCKED AFTER FAILED ATTEMPT [RHEL7]

ENVIRONMENT OS = RHEL 7 First one need to edit /etc/pam.d/password-auth and /etc/pam.d/system-auth and add highlighted / bold lines accurately auth required pam_env.so auth required pam_faillock.so preauth silent audit deny=3 unlock_time=600 auth sufficient pam_unix.so nullok try_first_pass auth [default=die] pam_faillock.so authfail audit deny=3 unlock_time=600   Then you need to add below line under account section at […]

RESTRICT SPECIFIC USER TO SU THE ROOT USER [RHEL7]

ENVIRONMENT OS = 7.3 redhat STEP-1 Open the file /etc/pam.d/su in vi or ay file editor and add the below line. vi /etc/pam.d/su auth      required      pam_wheel.so use_uid root_only use_uid group=groupa STEP-2 Ensure that the user who you want to su to the root user is the member of groupa.