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

June 17, 2019

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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]

March 13, 2019

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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]

March 13, 2019

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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.

HOW TO HA A REDIS APPLICATION [Master/Slave] THRU PACEMAKER

January 4, 2018

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ENVIRONMENT OS = RHEL 7.4 Total HA nodes = 2 ENVIRONMENT DETAILS In this environment pacemaker is installed on both machines. Redis is installed on both machines. A Master/Slave resource group is created. 2 HA heartbeats are configured thru corosync. SUPPOSED ENVIRONMENT ACTIVITY vi /etc/redis.conf bind 0.0.0.0              # This will make sure that redis will […]

How to grep commands output in windows | grep command for windows

January 12, 2017

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How to grep commands output in windows   If you want to grep specific output, use find command. Find below examples for reference.   netstat –n –a TCP   192.168.32.241:56847   40.77.226.192:443                 ESTABLISHED TCP   192.168.32.241:56870   40.77.229.39:443                    ESTABLISHED TCP   192.168.32.241:56873   40.77.229.64:443                  ESTABLISHED TCP   192.168.32.241:56925   108.160.172.204:443            TIME_WAIT TCP   192.168.169.1:139         0.0.0.0:0                                    LISTENING TCP   192.168.234.1:139     […]

Find out CPU, Sockets & Cores

August 18, 2016

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Environment OS = Redhat Enterprise Linux Version = 5.9 Find out total CPUs & Sockets dmidecode |grep -i cpu Example output: dmidecode |grep -i cpu Version: Intel(R) Xeon(R) CPU E5530 @ 2.40GHz Version: Intel(R) Xeon(R) CPU E5530 @ 2.40GHz Description Above command output shows total sockets i.e., 2 and total CPU/processors installed i.e., 2 OR […]

GlusterFS (File System) Installation and configuration on RHEL/CentOS and Fedora (REPLICA Environment)

May 29, 2015

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Creating GLUSTER was never too easy like I mentioned below. Follow my article Environment Centos 6.3 Nodes = 2 selinux = disabled Add host file entries on both nodes # yum install glusterfs-server # service glusterd start # service glusterd status # Create directories with same names on all servers # mkdir -p /data/brick1/gv0 # […]