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Recent Posts:
- How to Extend ocfs2 Filesystem with tunefs.ocfs2 Command (Whole device used without partitions)
- How to adjust a process score calculations for Out-of-memory situations in CentOS/RHEL
- How To Setup mutt in CentOS/RHEL
- Which network ports are reserved by the Linux Operating System?
- How to Reserve a Port Range for a Third Party Application in CentOS/RHEL
- How to reserve port for an application using the portreserve service
- Linux OS Service ‘portreserve’
- “shutdown” Command Examples in Linux
- How to Remove a file with space in Linux
- How to Force umount an NFS share on an NFS Client When NFS Server is Down
- How to configure NIS services to use static port in CentOS/RHEL
- How to Check if a Service Restart or Server Reboot is required After RPM Package Update (CentOS/RHEL/Fedora)
- 11 Useful “ssh” and “scp” Commands in Linux
- How to modify SNMP to run on custom port with tcp/udp and specific address in CentOS/RHEL
- 6 Bash Shell Command Line Chaining Operators in Linux
- 14 Useful “cat” Command Examples in Linux
- The System Activity Reporter (sar) Command in Linux
- How to find which specific ethernet device corresponds to a specific port on a multi-interface network card in CentOS/RHEL
- Oracleasm Service Fails to Start After Upgrade to oracleasm-support-2.1.11-1 RPM Package
- Linux OS Service ‘kudzu’
- Linux OS Service ‘lm_sensors’
- Input/Output Errors During XFS Filesystem Access In CentOS/RHEL 7
- Audit rules for monitoring Copy, move, delete and kill Commands In Linux
- How to Verify if ALUA Mode is Enabled on a LUN in CentOS/RHEL
- “mlock failed: Cannot allocate memory” lvcreate command error in CentOS/RHEL 7
- How to avoid the “promiscuous mode” messages being logged repeatedly in /var/log/messages
- How to Configure Interface(s) in promiscuous mode on CentOS/RHEL 7 (persistently)
- “Abort command issued nexus” error messages in /var/log/messages file
- Oracle ASM 12c – New Features with examples
- Oracle Database 12c New Feature – RMAN “RECOVER TABLE”
- Interview Questions : Oracle Flex ASM 12c
- Oracle sql script to report the list of files stored in ASM and CURRENTLY NOT OPENED
- How to disable the Out of memory or oom-killer in CentOS/RHEL 5,6
- How to disable the Out of memory or oom-killer in CentOS/RHEL 4
- What is Out-of-Memory (OOM) Killer in Linux (Causes, Troubleshooting, Mitigation)
- How to Manually Modify the GRUB parameters in CentOS/RHEL 7 before Booting
- “comm” Command in Linux with Examples
- How to move ASM spfile from External Redundancy To Normal Redundancy in version 12.1.0.2 and above
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- SSSD: How to disable PREAUTH permanently in CentOS/RHEL 7
- Order of environment calls for different OS shells in Linux
- SSSD Service Failing with “SSSD is already running” in CentOS/RHEL 7
- How To Disable Advanced Analytics in Oracle Database 12c?
- “Bad id for repo: My Repo, byte = 2” yum update error
- How to disable lvmetad in CentOS/RHEL
- How to disable rtkit-daemon in CentOS/RHEL
- How to configure rsysnc in daemon mode (allow rsync and disable SSH login) in CentOS/RHEL
- How to view past performance with sar in Linux
- How to set/disable banner message (MOTD) for a specific user in CentOS/RHEL
- Understanding shell profiles in CentOS/RHEL
- How to find the commands run by user before reboot in CentOS/RHEL
- How to Start/Stop and Enable/Disable process accounting (psacct)
- How to Configure Separate Port For SSH and SFTP On CentOS/RHEL
- What is OCFS or OCFS2
- How to Change the Default Timeout Settings for Telnet Session in CentOS/RHEL
- How to modify snmp service to listen to an alternative port in CentOS/RHEL
- 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