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Recent Posts:
- How to Recover Missing GRUB2 Files from /boot
- How to Stop SSH Session From Getting Timed Out
- How to Setup SSH keys for “passwordless” SSH Login on CentOS/RHEL
- How to test port connectivity using nc utility in CentOS/RHEL
- Why Does “netstat” Output Show Many Connections in CLOSE_WAIT Status?
- How to Configure TCP Keepalive option in Solaris
- How to Test Port [TCP/UDP] Connectivity from a Linux Server
- Kernel Logs Warning Messages “kernel: Possible SYN flooding on port X. Sending cookies” is logged”
- Interview Questions : Linux Package Manager (RPM)
- Troubleshooting “connection refused” From Remote Servers in CentOS/RHEL 7 (Either Firewalld or iptables service issue)
- SSH Connection Refused by TCP Wrapper
- “ntpq -pn” command returns with error “Name or service not known”
- What is the refid in ntpq -p output?
- Why Does “/var/log/messages” Report Martian Packets
- What is HBA Queue Depth and How to Check the Current Queue Depth Value and how to Change it
- How to disable ping responses from CentOS/RHEL system
- How to Configure Network Teaming in CentOS/RHEL 7
- lvcreate/lvremove Failed with Error “Can’t remove merging snapshot logical volume”
- How to revert an accidental chown or chmod on a directory in CentOS/RHEL
- How to restore the permission/ownership to default in case of accidental change of permission/ownership
- How to Configure iSCSI targets on Solaris 10
- How to obtain virtual/physical CPU information in Oracle VM (XEN)
- iSCSI connection command examples (Cheat Sheet)
- “iscsiadm” Discovery TimeOut With Two Or More Network Interfaces in CentOS/RHEL
- Unable To Extend LVM File System with Associated Snapshot in CentOS/RHEL
- Solaris Zone Install Fails With Cpio Error
- RPM : package installation Error : cpio: read failed
- Understanding the Hadoop MapReduce framework
- lvdisplay error: “Failed to create directory /var/lock/lvm. File-based locking initilisation failed.”
- CCA131 – Configure NameNode HA
- Swapon Fails To Mount Swap – Gives Invalid Argument Error
- CCA131 – Configuring HDFS snapshot Policy
- How To Disable MD5-based HMAC Algorithm’s for SSH
- Script/Queries to Monitor Temporary Tablespace Usage in Oracle Database
- How to Disable snmp v1 and v2 and enable SNMP v3 only under Linux
- Reducing/Limiting the CPUs in CentOS/RHEL 5,6
- How to increase swap space on Linux
- CCA 131 – Create/restore a snapshot of an HDFS directory (Using Cloudera Manager)
- CCA131 – Create an HDFS user’s home directory
- CCA 131 – Configure HDFS ACLs
- How to monitor Undo Tablespace Usage and the Free Space in Oracle Database
- Script To Get Tablespace Utilization In Oracle Database 12c
- How to Audit File Access on Linux
- systemd alternatives to ‘service’ ‘chkconfig’ and ‘init ‘ commands in CentOS/RHEL 7
- How to disable the default apache “Welcome Page” in CentOS/RHEL 7
- CCA 131 – Rebalance the cluster
- CCA 131 – Commission/decommission a node
- CCA 131 – Add a service using Cloudera Manager
- CCA 131 – Add a new node to an existing cluster
- CCA 131 – Install CDH using Cloudera Manager
- CCA 131 – Install Cloudera Manager server and agents
- CCA 131 – Perform OS-level configuration for Hadoop installation
- Preparing for the CCA Administrator Exam (CCA131)
- CCA 131 – Set up a local CDH repository
- How to measure NIC Performance/Throughput in Solaris 11 using iftop
- How to modify the UUID of a Volume Group (VG) or Physical Volume (PV) in CentOS/RHEL
- 10 useful cron examples to schedule jobs in Linux
- How to install rsyslog7 when rsyslog5 is already installed in CentOS/RHEL
- Understanding How an Email System Works
- How to kill a process in Linux (kill, killall, pkill, xkill)
- HDPCA Practice Exam Questions and AWS Instance Setup Details
- HDPCA Exam Objective – Configure HiveServer2 HA ( Part 2 – Configure HA )
- How to configure Capacity Scheduler Queues Using YARN Queue Manager
- How to Create HDFS policies in Ranger
- How to Configure Hive Authorization Using Apache Ranger
- HDPCA Exam Objective – Configure HiveServer2 HA ( Part 1 – Installing HiveServer )
- HDPCA Exam Objective – View an application’s log file (Troubleshoot a failed job)
- HDPCA Exam Objective – Configure and manage alerts
- HDPCA Exam Objective – Install and configure Knox
- HDPCA Exam Objective – Configure the Capacity Scheduler
- HDPCA Exam Objective – Configure HDFS ACLs
- HDPCA Exam Objective – Install and configure Ranger
- HDPCA Exam Objective – Recover a snapshot
- HDPCA Exam Objective – Create a snapshot of an HDFS directory
- HDPCA Exam Objective – Change the configuration of a service using Ambari
- HDPCA Exam Objective – Restart an HDP service
- RMAN-06059 During RMAN Backup of archivelogs ( How to backup archivelogs moved to a different location)
- HDPCA Exam Objective – Configure ResourceManager HA
- HDPCA Exam Objective – Configure NameNode HA
- HDPCA Exam Objective – Add a new node to an existing cluster
- HDPCA Exam Objective – Create a home directory for a user and configure permissions
- HDPCA Exam Objective – Define and deploy a rack topology script
- HDPCA Exam Objective – Add an HDP service to a cluster using Ambari
- HDPCA Exam Objective – Decommission a node (NodeManager)
- HDPCA Exam Objective – Decommission a node (datanode)
- How to create partitions and file systems on DM-Multipath devices
- 18 Practical tcpdump Command Examples – A Network Sniffer Tool Primer
- How to change the path of the auditd log file /var/log/audit/audit.log
- How to install and configure “setroubleshootd” on CentOS/RHEL
- Understanding Linux SCSI Reservation
- Linux OS Service ‘setroubleshoot’
- How to connect to an Active Directory Domain using Realmd (Configure CentOS/RHEL 7 as active directory client)
- understanding “yum history” command output
- Linux OS Service ‘psacct’
- Linux OS Service ‘NetworkManagerDispatcher’
- How to disable avahi-daemon service in CentOS/RHEL
- CentOS/RHEL 5 : How to disable the yum update automatically
- Linux OS Service ‘yum-updatesd’
- Linux OS Service ‘acpid’
- Manage ASM Audit Files with syslog – configure lograte and auditing